Pub Date : 2017-11-01DOI: 10.1109/ICASE.2017.8374267
Zakaria Khan, Ayesha
Road Traffic is growing all over the world and so are the associated complexities and problems. It is imperative for every driver to abide by the traffic rules for safe journey. These rules including speed-limits and warning signs vary and differ from place to place and it gets difficult for drivers to remain mindful of abiding by such varying rules at all the times and places. Over-speeding is one of the most crucial issues all over the world. Most of the fatal accidents occur due to over-speeding and it becomes extremely difficult for traffic controlling authorities to have an effective control on over-speeding by applying conventional methodologies. Besides smooth running and excessive traffic-jams, the main concern of traffic regulating authorities is to help drivers to remain watchful of local traffic rules including speed-limits. It is the need of time to have an effective control on the over-speeding of every vehicle on the road during day and night without detailing multitude of traffic-wardens equipped with speed checking devices. To effectively circumvent with the issues, a traffic-regulating system is proposed mainly comprising of a Global Positioning System (GPS) Receiver equipped with Global System for Mobile Communication (GSM), and micro-controller. The proposed work is going to be an effort to control and regulate the speed of the vehicles augmented with computer software to enable the third party or owner/supervisor to know the location, speed and activity of the driver. The system will transmit information in real time. The use of GSM/GPRS technologies will allows the system to track the objects and provide the up-to-date information. The proposed equipment/device will compare the present position and speed of the vehicle with applicable traffic rules and on occurrence of any violation, will caution the driver in his/her choice of language and will also send the violation information to the supervising authorities. Implementation of the system especially in Pakistan, can lower the number of accidents & ensuing casualties. The proposed system can be a viable source of revenue-generation for traffic-controlling authorities through automatic fine-generation system, without putting resources in terms of manpower and equipment on the roads. This system can also be linked to emergency services like Ambulance & Fire Brigade Services for real time accident notification and with the help of real time location information, services can respond more quickly and efficiently.
{"title":"Wireless speed monitoring system using GNSS technology","authors":"Zakaria Khan, Ayesha","doi":"10.1109/ICASE.2017.8374267","DOIUrl":"https://doi.org/10.1109/ICASE.2017.8374267","url":null,"abstract":"Road Traffic is growing all over the world and so are the associated complexities and problems. It is imperative for every driver to abide by the traffic rules for safe journey. These rules including speed-limits and warning signs vary and differ from place to place and it gets difficult for drivers to remain mindful of abiding by such varying rules at all the times and places. Over-speeding is one of the most crucial issues all over the world. Most of the fatal accidents occur due to over-speeding and it becomes extremely difficult for traffic controlling authorities to have an effective control on over-speeding by applying conventional methodologies. Besides smooth running and excessive traffic-jams, the main concern of traffic regulating authorities is to help drivers to remain watchful of local traffic rules including speed-limits. It is the need of time to have an effective control on the over-speeding of every vehicle on the road during day and night without detailing multitude of traffic-wardens equipped with speed checking devices. To effectively circumvent with the issues, a traffic-regulating system is proposed mainly comprising of a Global Positioning System (GPS) Receiver equipped with Global System for Mobile Communication (GSM), and micro-controller. The proposed work is going to be an effort to control and regulate the speed of the vehicles augmented with computer software to enable the third party or owner/supervisor to know the location, speed and activity of the driver. The system will transmit information in real time. The use of GSM/GPRS technologies will allows the system to track the objects and provide the up-to-date information. The proposed equipment/device will compare the present position and speed of the vehicle with applicable traffic rules and on occurrence of any violation, will caution the driver in his/her choice of language and will also send the violation information to the supervising authorities. Implementation of the system especially in Pakistan, can lower the number of accidents & ensuing casualties. The proposed system can be a viable source of revenue-generation for traffic-controlling authorities through automatic fine-generation system, without putting resources in terms of manpower and equipment on the roads. This system can also be linked to emergency services like Ambulance & Fire Brigade Services for real time accident notification and with the help of real time location information, services can respond more quickly and efficiently.","PeriodicalId":203936,"journal":{"name":"2017 Fifth International Conference on Aerospace Science & Engineering (ICASE)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129409881","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-11-01DOI: 10.1109/ICASE.2017.8374281
S. U. Haq, Ali Sarosh, Mahhad Nayyer, Syed Irtiza Ali Shah
The integration of ground-based optical sensors with an indigenously written satellite-tracking algorithm to verify the output of computational model is of vital importance in the emerging field of Space Situational Awareness (SSA). The term SSA is used to refer to any setup, sensory or computational, focused towards tracking the natural and man-made satellites that are orbiting the Earth. A rising number of spatial bodies, both natural and artificial in the space around Earth, primarily in the low Earth orbit (LEO), pose a serious collision threat to currently operational satellites. Moreover, SSA also gives insight about spatial population to determine the optimal altitude and inclination of an orbit for all missions under design and development. Keeping in view the importance of SSA in present and future space missions, an algorithm was developed based on SGP4 and SDP4 analytical models to convert the TLE raw data into ground tracks. A satellite-tracking algorithm was then developedfirst to model ground tracks for satellites in geostationary Earth orbit (GEO) as well as low Earth orbit (LEO) by using their Two-Line Elements (TLEs), available on the NORAD database. Moreover, the code was further analyzed using the PREDICT methodology given by David Vallado to find the corresponding azimuth and elevation angles of all the satellites in consideration. Using basic feed-forward and feedback control techniques, the azimuth-elevation readings were transferred to a small telescope (less than 1m in diameter) with the help of an Alt-Az mount and fast moving slewing mechanism. Two methods were purposed in this study to integrate the telescope to mathematical solution. The setup was verified by observing the International Space Station (ISS) Zarya module as it is visible by a naked eye. The integration of an optical sensor is vital in the generation of accurate satellite ephemerides which is the basic requirement for an effective SSA setup. In the future, image optimization algorithms can be developed to improve the quality of the optical observations and to make observations of faint space objects possible.
{"title":"Integration of small telescopes with satellite tracking analytical model for space situational awareness (SSA)","authors":"S. U. Haq, Ali Sarosh, Mahhad Nayyer, Syed Irtiza Ali Shah","doi":"10.1109/ICASE.2017.8374281","DOIUrl":"https://doi.org/10.1109/ICASE.2017.8374281","url":null,"abstract":"The integration of ground-based optical sensors with an indigenously written satellite-tracking algorithm to verify the output of computational model is of vital importance in the emerging field of Space Situational Awareness (SSA). The term SSA is used to refer to any setup, sensory or computational, focused towards tracking the natural and man-made satellites that are orbiting the Earth. A rising number of spatial bodies, both natural and artificial in the space around Earth, primarily in the low Earth orbit (LEO), pose a serious collision threat to currently operational satellites. Moreover, SSA also gives insight about spatial population to determine the optimal altitude and inclination of an orbit for all missions under design and development. Keeping in view the importance of SSA in present and future space missions, an algorithm was developed based on SGP4 and SDP4 analytical models to convert the TLE raw data into ground tracks. A satellite-tracking algorithm was then developedfirst to model ground tracks for satellites in geostationary Earth orbit (GEO) as well as low Earth orbit (LEO) by using their Two-Line Elements (TLEs), available on the NORAD database. Moreover, the code was further analyzed using the PREDICT methodology given by David Vallado to find the corresponding azimuth and elevation angles of all the satellites in consideration. Using basic feed-forward and feedback control techniques, the azimuth-elevation readings were transferred to a small telescope (less than 1m in diameter) with the help of an Alt-Az mount and fast moving slewing mechanism. Two methods were purposed in this study to integrate the telescope to mathematical solution. The setup was verified by observing the International Space Station (ISS) Zarya module as it is visible by a naked eye. The integration of an optical sensor is vital in the generation of accurate satellite ephemerides which is the basic requirement for an effective SSA setup. In the future, image optimization algorithms can be developed to improve the quality of the optical observations and to make observations of faint space objects possible.","PeriodicalId":203936,"journal":{"name":"2017 Fifth International Conference on Aerospace Science & Engineering (ICASE)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126323946","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-11-01DOI: 10.1109/ICASE.2017.8374249
W. Arshad, Usman Khalid
Data gathered from Gas Turbine Sensors needs to be classified. This data is needed to create mathematical models which can be used by Fuel Control System to analyze when one or more parameters of gas turbine is under or off shooting. To reach a model which can simulate real-time working of gas turbine, the nonlinear transfer functions of gas turbines are to be given boundary conditions, and performance is optimized by analyzing change in behavior and hence changing gain for linearized transfer function. Errors are then introduced in working of gas turbine on Supervisory, demand and output level. These errors cause transients to increase and power balance to falter, are rectified via mathematical models created from analyzed data and predicts major failures which are probable to occur in future.
{"title":"Gas turbine fuel systems and data analytics","authors":"W. Arshad, Usman Khalid","doi":"10.1109/ICASE.2017.8374249","DOIUrl":"https://doi.org/10.1109/ICASE.2017.8374249","url":null,"abstract":"Data gathered from Gas Turbine Sensors needs to be classified. This data is needed to create mathematical models which can be used by Fuel Control System to analyze when one or more parameters of gas turbine is under or off shooting. To reach a model which can simulate real-time working of gas turbine, the nonlinear transfer functions of gas turbines are to be given boundary conditions, and performance is optimized by analyzing change in behavior and hence changing gain for linearized transfer function. Errors are then introduced in working of gas turbine on Supervisory, demand and output level. These errors cause transients to increase and power balance to falter, are rectified via mathematical models created from analyzed data and predicts major failures which are probable to occur in future.","PeriodicalId":203936,"journal":{"name":"2017 Fifth International Conference on Aerospace Science & Engineering (ICASE)","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129537974","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-11-01DOI: 10.1109/ICASE.2017.8374252
Aamir Naveed, N. Khan
The aviation industry of the current era is dominated by the profound utilization of strengthened structures for a prolonged service life. High speed aircrafts are vulnerable to higher bending and torsional loads due to rapidly fluctuating aerodynamic loads. The need of the hour is to be aware of the loadings and their implications on the life of the beams. The current research paper focuses on a cracked Timoshenko beam. These beams can be easily co-related with numerous structures inside the wing and fuselage of the aircraft. As a first case, the crack depth and the crack locations were varied to observe the variations in natural frequencies of the vibrating Timoshenko beam. Following this, a harmonic force (F0∗cos(wt)) was applied and the forced beam response was observed at a constant time. Subsequently, time varying response was extracted for the same beam at different location. A variety of loads, including rectangular pulse, impulse, blast, step and ramp loads were applied and their complete forced responses were observed at specific locations on the beam over time. It was pertinent to mention here that the responses extracted at the crack locations were more severe than those farther from the crack location. The current research could be used to observe the time varying response of these loads and, subsequently, determining the fatigue life of cracked beams. This analysis can prove very fruitful in the field of SHM (Structural health monitoring) and the durability of materials used in the aviation industry can be easily accessed.
{"title":"Natural frequency and time response variation for forced vibrations of cracked Timoshenko beams","authors":"Aamir Naveed, N. Khan","doi":"10.1109/ICASE.2017.8374252","DOIUrl":"https://doi.org/10.1109/ICASE.2017.8374252","url":null,"abstract":"The aviation industry of the current era is dominated by the profound utilization of strengthened structures for a prolonged service life. High speed aircrafts are vulnerable to higher bending and torsional loads due to rapidly fluctuating aerodynamic loads. The need of the hour is to be aware of the loadings and their implications on the life of the beams. The current research paper focuses on a cracked Timoshenko beam. These beams can be easily co-related with numerous structures inside the wing and fuselage of the aircraft. As a first case, the crack depth and the crack locations were varied to observe the variations in natural frequencies of the vibrating Timoshenko beam. Following this, a harmonic force (F0∗cos(wt)) was applied and the forced beam response was observed at a constant time. Subsequently, time varying response was extracted for the same beam at different location. A variety of loads, including rectangular pulse, impulse, blast, step and ramp loads were applied and their complete forced responses were observed at specific locations on the beam over time. It was pertinent to mention here that the responses extracted at the crack locations were more severe than those farther from the crack location. The current research could be used to observe the time varying response of these loads and, subsequently, determining the fatigue life of cracked beams. This analysis can prove very fruitful in the field of SHM (Structural health monitoring) and the durability of materials used in the aviation industry can be easily accessed.","PeriodicalId":203936,"journal":{"name":"2017 Fifth International Conference on Aerospace Science & Engineering (ICASE)","volume":"150 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122219408","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-11-01DOI: 10.1109/ICASE.2017.8374261
H. Elahi, A. Israr, R. F. Swati, H. Khan, A. Tamoor
Piezoelectric materials have wide range of applications in the field of aerospace and automobile industry because of their ability to generate electric potential, response to mechanical signal as well as response to electric signal. An analytical model is constructed in this research work, this model is based on the shocking conditions that an automobile vehicle face in real time and the response of piezoelectric material to that mechanical shock. To find the response of smart structure i.e., Lead Zirconate Titanate (PZT-5A4E) to variable mechanical shocks for general automobile. Numerical simulations are carried out to determine the accumulative effect of the specified conditions and to analyze the stability of an automobile control system. This model provides novel mechanism for characterizing PZT-5A4E for smart structures using stability; validated by Nyquist Theorem and RH Table. The analytical model designed is stable for specified conditions.
{"title":"Stability of piezoelectric material for suspension applications","authors":"H. Elahi, A. Israr, R. F. Swati, H. Khan, A. Tamoor","doi":"10.1109/ICASE.2017.8374261","DOIUrl":"https://doi.org/10.1109/ICASE.2017.8374261","url":null,"abstract":"Piezoelectric materials have wide range of applications in the field of aerospace and automobile industry because of their ability to generate electric potential, response to mechanical signal as well as response to electric signal. An analytical model is constructed in this research work, this model is based on the shocking conditions that an automobile vehicle face in real time and the response of piezoelectric material to that mechanical shock. To find the response of smart structure i.e., Lead Zirconate Titanate (PZT-5A4E) to variable mechanical shocks for general automobile. Numerical simulations are carried out to determine the accumulative effect of the specified conditions and to analyze the stability of an automobile control system. This model provides novel mechanism for characterizing PZT-5A4E for smart structures using stability; validated by Nyquist Theorem and RH Table. The analytical model designed is stable for specified conditions.","PeriodicalId":203936,"journal":{"name":"2017 Fifth International Conference on Aerospace Science & Engineering (ICASE)","volume":"184 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121313982","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-11-01DOI: 10.1109/ICASE.2017.8374278
M. Alam, S. Zafar, Waqas Muhammad
The application of remote sensing & GIS technologies enables the assessment, monitoring and management of forestry resources at local, regional and global scale. The availability of freely available optical satellite data can be used for the cost-effective, efficient and timely understanding of the phenomenon related to the forests. One of the recent additions to the freely available optical satellite data is sentinel-2. Compared to its counterpart Landsat, it does have the improved spatial, temporal resolution and band positioning specifically tailored to the study of vegetation. This gives the possibility of improved performance which demands its potential to be assessed in the local context. The study evaluates the application of sentinel-2 for forest above ground biomass estimation in the context of Margallah hills national park, Pakistan. 33 sample plots of cheer pine, 22 paper mulberry and 12 other deciduous trees were surveyed through field campaigns of two weeks. The field data was converted to the plot level biomass as per the standard methods available in the literature. The imagery data was pre-processed and atmospherically corrected. Seven different indices as reported in the literature were calculated from the sentinel 2 level 2a data. The correlation for each tree species, and combined species was developed using multiple. Linear regression with all the calculated indices and regression analysis with the individual indices was computed. It was found that the variations in the spectral responses were poorly correlated with the field biomass values of the surveyed plots. The highest value of r2 for cheer pine was found to be 0.29, paper mulberry 0.31 and for all tree species 0.22. It was concluded that although the sentinel-2 has improved spatial and spectral resolution compared to Landsat, still it does not guarantee any promising model for the prediction of plot level biomass.
{"title":"Assessment of sentinel-2 vegetation indices for plot level tree AGB estimation","authors":"M. Alam, S. Zafar, Waqas Muhammad","doi":"10.1109/ICASE.2017.8374278","DOIUrl":"https://doi.org/10.1109/ICASE.2017.8374278","url":null,"abstract":"The application of remote sensing & GIS technologies enables the assessment, monitoring and management of forestry resources at local, regional and global scale. The availability of freely available optical satellite data can be used for the cost-effective, efficient and timely understanding of the phenomenon related to the forests. One of the recent additions to the freely available optical satellite data is sentinel-2. Compared to its counterpart Landsat, it does have the improved spatial, temporal resolution and band positioning specifically tailored to the study of vegetation. This gives the possibility of improved performance which demands its potential to be assessed in the local context. The study evaluates the application of sentinel-2 for forest above ground biomass estimation in the context of Margallah hills national park, Pakistan. 33 sample plots of cheer pine, 22 paper mulberry and 12 other deciduous trees were surveyed through field campaigns of two weeks. The field data was converted to the plot level biomass as per the standard methods available in the literature. The imagery data was pre-processed and atmospherically corrected. Seven different indices as reported in the literature were calculated from the sentinel 2 level 2a data. The correlation for each tree species, and combined species was developed using multiple. Linear regression with all the calculated indices and regression analysis with the individual indices was computed. It was found that the variations in the spectral responses were poorly correlated with the field biomass values of the surveyed plots. The highest value of r2 for cheer pine was found to be 0.29, paper mulberry 0.31 and for all tree species 0.22. It was concluded that although the sentinel-2 has improved spatial and spectral resolution compared to Landsat, still it does not guarantee any promising model for the prediction of plot level biomass.","PeriodicalId":203936,"journal":{"name":"2017 Fifth International Conference on Aerospace Science & Engineering (ICASE)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125965979","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-11-01DOI: 10.1109/ICASE.2017.8374286
Zia ul Haq, Bilal Hassan, M. Yousaf, H. Zahid
Generally, on-board LEO (Low Earth Orbit) satellite receivers work at extremely low carrier power levels and require high sensitivity for efficient demodulation. These receivers should not only be capable of operating at low input SNR (Signal to Noise Ratio) but also able to compensate an appreciable Doppler Frequency shift with varying power levels (depending upon the satellite orbit and operating frequency). Thus an efficient LEO satellite receiver should possess a large dynamic range and should be able to compensate an appreciable Doppler shift. In conventional satellite receivers, the IF block (which is responsible for demodulation and frequency compensation) are mostly designed using either the Foster Seeley or single Frequency synthesizer based approach. The Foster Seeley based approach has a good dynamic range but is very sensitive to the in-band noise generated by receiver electronics. On the other hand, single frequency synthesizer approach has a better noise immunity but it is unable to provide appreciable dynamic range, high sensitivity and low carrier input power operation. Therefore, in order to meet these contradictory requirements, the design of IF (Intermediate Frequency) block for narrow band LEO satellite TC receivers becomes a challenging task. In this paper, a novel dual PLL (Phase Locked Loop) design technique has been employed to cater for all the above performance requirements in telecommand receiver's IF block. First Phase Locked Loop is used to demodulate the carrier with improved noise performance and efficient Doppler compensation while second PLL is added to ensure the desired low carrier input power operation, appreciable dynamic range and high sensitivity and good noise performance.
{"title":"A novel dual PLL if block for on-board LEO satellite receivers","authors":"Zia ul Haq, Bilal Hassan, M. Yousaf, H. Zahid","doi":"10.1109/ICASE.2017.8374286","DOIUrl":"https://doi.org/10.1109/ICASE.2017.8374286","url":null,"abstract":"Generally, on-board LEO (Low Earth Orbit) satellite receivers work at extremely low carrier power levels and require high sensitivity for efficient demodulation. These receivers should not only be capable of operating at low input SNR (Signal to Noise Ratio) but also able to compensate an appreciable Doppler Frequency shift with varying power levels (depending upon the satellite orbit and operating frequency). Thus an efficient LEO satellite receiver should possess a large dynamic range and should be able to compensate an appreciable Doppler shift. In conventional satellite receivers, the IF block (which is responsible for demodulation and frequency compensation) are mostly designed using either the Foster Seeley or single Frequency synthesizer based approach. The Foster Seeley based approach has a good dynamic range but is very sensitive to the in-band noise generated by receiver electronics. On the other hand, single frequency synthesizer approach has a better noise immunity but it is unable to provide appreciable dynamic range, high sensitivity and low carrier input power operation. Therefore, in order to meet these contradictory requirements, the design of IF (Intermediate Frequency) block for narrow band LEO satellite TC receivers becomes a challenging task. In this paper, a novel dual PLL (Phase Locked Loop) design technique has been employed to cater for all the above performance requirements in telecommand receiver's IF block. First Phase Locked Loop is used to demodulate the carrier with improved noise performance and efficient Doppler compensation while second PLL is added to ensure the desired low carrier input power operation, appreciable dynamic range and high sensitivity and good noise performance.","PeriodicalId":203936,"journal":{"name":"2017 Fifth International Conference on Aerospace Science & Engineering (ICASE)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114822387","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-11-01DOI: 10.1109/ICASE.2017.8374247
M. Ozair, S. Jamshed, M. N. Qureshi
Hammerhead nose cone configurations are essential in accommodating larger payloads. However, during transonic flight regime, they experience high-level of pressure fluctuations due to flow-induced turbulence, wake effects, flow separation and shock oscillations which can lead to severe buffet phenomenon. Buffet loads can cause severe structural damage to the payload; and can ultimately destroy the whole mission. Therefore, it is extremely necessary to determine unsteady pressure fluctuations on a hammerhead configuration and consider them in the overall design load analysis to ensure that the configuration is safe from the severity of buffet loads. In the present work, time-accurate CFD simulation of flow over a hammerhead nose cone configuration (NASA Model IV) has been performed for a Mach number of 0.79. The objectives of the present work are to compute the unsteady surface pressure fluctuations, analyze the time-accurate aerodynamic behaviour of the flow, and determine the validity and accuracy of the computational methodology using ANSYS Fluent®. For validation, the rms (root mean square) value of the computed instantaneous pressure is compared with the experimental results and the time-average solution is compared with the steady state solution. In the present work, the separated shear layer off the boat-tail edge is successfully captured and the turbulence region downstream is found responsible for unsteady loadings.
{"title":"Time-accurate CFD simulation of transonic flow over a hammerhead nose cone configuration","authors":"M. Ozair, S. Jamshed, M. N. Qureshi","doi":"10.1109/ICASE.2017.8374247","DOIUrl":"https://doi.org/10.1109/ICASE.2017.8374247","url":null,"abstract":"Hammerhead nose cone configurations are essential in accommodating larger payloads. However, during transonic flight regime, they experience high-level of pressure fluctuations due to flow-induced turbulence, wake effects, flow separation and shock oscillations which can lead to severe buffet phenomenon. Buffet loads can cause severe structural damage to the payload; and can ultimately destroy the whole mission. Therefore, it is extremely necessary to determine unsteady pressure fluctuations on a hammerhead configuration and consider them in the overall design load analysis to ensure that the configuration is safe from the severity of buffet loads. In the present work, time-accurate CFD simulation of flow over a hammerhead nose cone configuration (NASA Model IV) has been performed for a Mach number of 0.79. The objectives of the present work are to compute the unsteady surface pressure fluctuations, analyze the time-accurate aerodynamic behaviour of the flow, and determine the validity and accuracy of the computational methodology using ANSYS Fluent®. For validation, the rms (root mean square) value of the computed instantaneous pressure is compared with the experimental results and the time-average solution is compared with the steady state solution. In the present work, the separated shear layer off the boat-tail edge is successfully captured and the turbulence region downstream is found responsible for unsteady loadings.","PeriodicalId":203936,"journal":{"name":"2017 Fifth International Conference on Aerospace Science & Engineering (ICASE)","volume":"120 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132611868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-11-01DOI: 10.1109/ICASE.2017.8374269
Zeeshan Haider Hashmi
The National Geodetic Survey (NGS) CORS sites deviate from their assigned position coordinates due to seismic activities. A rigorous computation is required to maintain position coordinates of NGS CORS network. On 23rd of June 2014 an earthquake of magnitude 7.9 strongly hit the Aleutian Islands. This earthquake deviated Adak AB21 CORS site from its assigned NAD_83 (EPOCH 2010) position coordinates. NGS revised position of this CORS site last time in December 2012 by using 57 days of data. As the position coordinates of this CORS site are not revised after 2012, the present GPS data shows a significant deviation of this CORS site from published position coordinates. This substantial deviation is due to Aleutian Islands earthquake and the North American tectonic plate movement. In this paper précised computations of all inter seismic, co seismic, and post seismic activities associated with Aleutian Islands earthquake are achieved to revise Adak AB21 CORS position coordinates. This paper includes precise measurement of all seismic deviations due to 23rd June 2014 Aleutian Islands earthquake, by using AB21 CORS site observation data. For this purpose 24 hr GPS observation data recorded by AB21 CORS site on 23rd of June 2014 is post processed with RTKLIB software by configuring RTKPOST. 60 days post seismic data recorded by the same CORS site is used to compute the deviation from its assigned NAD_83 (2011) position coordinates. This GPS observation data is post processed by Online Position User Service (OPUS).
{"title":"Performance analysis of NGS CORS site for precise measurement of seismic activities","authors":"Zeeshan Haider Hashmi","doi":"10.1109/ICASE.2017.8374269","DOIUrl":"https://doi.org/10.1109/ICASE.2017.8374269","url":null,"abstract":"The National Geodetic Survey (NGS) CORS sites deviate from their assigned position coordinates due to seismic activities. A rigorous computation is required to maintain position coordinates of NGS CORS network. On 23rd of June 2014 an earthquake of magnitude 7.9 strongly hit the Aleutian Islands. This earthquake deviated Adak AB21 CORS site from its assigned NAD_83 (EPOCH 2010) position coordinates. NGS revised position of this CORS site last time in December 2012 by using 57 days of data. As the position coordinates of this CORS site are not revised after 2012, the present GPS data shows a significant deviation of this CORS site from published position coordinates. This substantial deviation is due to Aleutian Islands earthquake and the North American tectonic plate movement. In this paper précised computations of all inter seismic, co seismic, and post seismic activities associated with Aleutian Islands earthquake are achieved to revise Adak AB21 CORS position coordinates. This paper includes precise measurement of all seismic deviations due to 23rd June 2014 Aleutian Islands earthquake, by using AB21 CORS site observation data. For this purpose 24 hr GPS observation data recorded by AB21 CORS site on 23rd of June 2014 is post processed with RTKLIB software by configuring RTKPOST. 60 days post seismic data recorded by the same CORS site is used to compute the deviation from its assigned NAD_83 (2011) position coordinates. This GPS observation data is post processed by Online Position User Service (OPUS).","PeriodicalId":203936,"journal":{"name":"2017 Fifth International Conference on Aerospace Science & Engineering (ICASE)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123614887","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-11-01DOI: 10.1109/ICASE.2017.8374245
N. Naqvi, F. Ahmed, U. Ahmed, D. Amin
In the current strive of globalization and technical advancement, it is need of hour to develop a general sense of space technology education and popularization among the general public so that they may work side by side by subject matter experts for the betterment of masses and progress of scientific advancements. This paper will also highlight the role of subject matter experts in development of awareness among the common masses and also emphasize on implication of connection between young aspirants and scholars of field to inspire and motivate youth to join the league. A traditional approach for awareness gauging is achieved using feedback and healthy competition protocol. This approach not only focuses on the awareness creation but also brings public united and to create awareness among the general public. The results indicate the implication of effectiveness and scope improvised in this approach is far better than the targeted audience strategy however the depth of knowledge transferred is limited. It is also important to indicate these strategies induce awareness for the need of knowledge, so this act as foundation for other strategic development for young aspirants. This paper also indicates the role of subject matter experts in implication of knowledge through common activities and providing people with unique experience of event development for awareness activities. The research has a widespread impact because of the broad spectrum of events under consideration along with the larger control group and implicates better pointers for policy and strategy makers of sciences in general and space technology in particular. This paper also indicates the global impact of such events and its role in development of international community for space technology education and popularization (STEP®).
{"title":"Role of subject matter experts in creating awareness through space technology education and popularization (STEP®): World space week celebrations — A case study","authors":"N. Naqvi, F. Ahmed, U. Ahmed, D. Amin","doi":"10.1109/ICASE.2017.8374245","DOIUrl":"https://doi.org/10.1109/ICASE.2017.8374245","url":null,"abstract":"In the current strive of globalization and technical advancement, it is need of hour to develop a general sense of space technology education and popularization among the general public so that they may work side by side by subject matter experts for the betterment of masses and progress of scientific advancements. This paper will also highlight the role of subject matter experts in development of awareness among the common masses and also emphasize on implication of connection between young aspirants and scholars of field to inspire and motivate youth to join the league. A traditional approach for awareness gauging is achieved using feedback and healthy competition protocol. This approach not only focuses on the awareness creation but also brings public united and to create awareness among the general public. The results indicate the implication of effectiveness and scope improvised in this approach is far better than the targeted audience strategy however the depth of knowledge transferred is limited. It is also important to indicate these strategies induce awareness for the need of knowledge, so this act as foundation for other strategic development for young aspirants. This paper also indicates the role of subject matter experts in implication of knowledge through common activities and providing people with unique experience of event development for awareness activities. The research has a widespread impact because of the broad spectrum of events under consideration along with the larger control group and implicates better pointers for policy and strategy makers of sciences in general and space technology in particular. This paper also indicates the global impact of such events and its role in development of international community for space technology education and popularization (STEP®).","PeriodicalId":203936,"journal":{"name":"2017 Fifth International Conference on Aerospace Science & Engineering (ICASE)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127897721","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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