Pub Date : 2019-01-01DOI: 10.1109/IBCAST.2019.8667177
Ghedjatti Ilyes, Yuan Shiwei, Wang Haixing
The performance of a fuel, or propellant, depends critically on its combustion characteristics which have a direct impact on the system performance, reliability, long-term stability and environmental footprint. Also, cost, operability and material availability must be considered. Based on what has already been investigated in previous studies, metal fuels can be combusted with water or even with air as oxidizers to generate heat for many applications. Furthermore, when they are burned with air, low-net-carbon emissions can be achieved by capturing and recycling the combustion products. When metals react with water under specific conditions, it produces hydrogen on demand in exothermic reactions. Metals can be produced with clean primary energy through electrolysis, or other methods, and then store this energy as a chemical one in the metal fuel that can be released through oxidation by air, water, or even carbon dioxide, amongst other oxidants. Metals represent a promising solution for the future of propulsion and energy-conversion applications due to their reactivity with water, high energy densities and wide availability. However, as it is demonstrated in other studies, there are key limitations about the waste of the thermal energy in the case of low-temperature reactions and the waste of the chemical energy contained within the generated hydrogen as a reaction product in the case of high-temperature propulsion applications. Also, this concept when applied for onboard vehicles presents a number of difficulties related to storage systems and reaction rate kinetics. The objective of this work is to explore and investigate relevant, recent alternatives for developing clean energy with high performances based on hydrogen generation from metal-water reactions, focusing basically on rocket propulsion. The main characteristics of energy from metal fuels are numerically investigated and compared to the ones of the conventional, existing fuels. The techniques that are to be possibly used for exploiting the energetic potential of metal-water reactions are as follows: low-temperature metal-water reactors for fuel cells or other power systems, and high energy densities metals and water mixtures as propellants for underwater and aerospace propulsion. Thus, the exhausted hydrogen as a reaction product can act as a secondary fuel, enhance the combustion performance and produce thrust.
{"title":"Energy generation from metal-water reaction for power systems, underwater and aerospace propulsion applications","authors":"Ghedjatti Ilyes, Yuan Shiwei, Wang Haixing","doi":"10.1109/IBCAST.2019.8667177","DOIUrl":"https://doi.org/10.1109/IBCAST.2019.8667177","url":null,"abstract":"The performance of a fuel, or propellant, depends critically on its combustion characteristics which have a direct impact on the system performance, reliability, long-term stability and environmental footprint. Also, cost, operability and material availability must be considered. Based on what has already been investigated in previous studies, metal fuels can be combusted with water or even with air as oxidizers to generate heat for many applications. Furthermore, when they are burned with air, low-net-carbon emissions can be achieved by capturing and recycling the combustion products. When metals react with water under specific conditions, it produces hydrogen on demand in exothermic reactions. Metals can be produced with clean primary energy through electrolysis, or other methods, and then store this energy as a chemical one in the metal fuel that can be released through oxidation by air, water, or even carbon dioxide, amongst other oxidants. Metals represent a promising solution for the future of propulsion and energy-conversion applications due to their reactivity with water, high energy densities and wide availability. However, as it is demonstrated in other studies, there are key limitations about the waste of the thermal energy in the case of low-temperature reactions and the waste of the chemical energy contained within the generated hydrogen as a reaction product in the case of high-temperature propulsion applications. Also, this concept when applied for onboard vehicles presents a number of difficulties related to storage systems and reaction rate kinetics. The objective of this work is to explore and investigate relevant, recent alternatives for developing clean energy with high performances based on hydrogen generation from metal-water reactions, focusing basically on rocket propulsion. The main characteristics of energy from metal fuels are numerically investigated and compared to the ones of the conventional, existing fuels. The techniques that are to be possibly used for exploiting the energetic potential of metal-water reactions are as follows: low-temperature metal-water reactors for fuel cells or other power systems, and high energy densities metals and water mixtures as propellants for underwater and aerospace propulsion. Thus, the exhausted hydrogen as a reaction product can act as a secondary fuel, enhance the combustion performance and produce thrust.","PeriodicalId":335329,"journal":{"name":"2019 16th International Bhurban Conference on Applied Sciences and Technology (IBCAST)","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132712017","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 : 2019-01-01DOI: 10.1109/IBCAST.2019.8666964
Umair Javaid, Muhammad Junaid Razzaq, S. F. Rafique
Tracking performance is critical for spacecraft attitude tracking control. In this paper, we develop control law to obtain efficient tracking performance for attitude maneuver of rigid body spacecraft in the presence of external disturbance and system parameter uncertainties. The control law capitalize robustness of the sliding mode control (SMC) to model parameter uncertainties and fluctuations, while taking advantage of easy and simple design of proportional derivative (PD) control. Initially, SMC law is developed for the nonlinear spacecraft attitude control system then PD control is introduced in the input control scheme to alleviate chattering. It is assumed that external disturbance and spacecraft inertia bounds are unknown. Adaptive update law is developed to obtain the bounds. Stability of closed loop system is analyzed using Lyapunove’s theory. The proposed control scheme gives smooth and efficient tracking performance. Robustness and effectiveness of the control law is proven through simulation results.
{"title":"PD Integrated Sliding Mode Controller design for Attitude Tracking Control of Rigid Body Spacecraft","authors":"Umair Javaid, Muhammad Junaid Razzaq, S. F. Rafique","doi":"10.1109/IBCAST.2019.8666964","DOIUrl":"https://doi.org/10.1109/IBCAST.2019.8666964","url":null,"abstract":"Tracking performance is critical for spacecraft attitude tracking control. In this paper, we develop control law to obtain efficient tracking performance for attitude maneuver of rigid body spacecraft in the presence of external disturbance and system parameter uncertainties. The control law capitalize robustness of the sliding mode control (SMC) to model parameter uncertainties and fluctuations, while taking advantage of easy and simple design of proportional derivative (PD) control. Initially, SMC law is developed for the nonlinear spacecraft attitude control system then PD control is introduced in the input control scheme to alleviate chattering. It is assumed that external disturbance and spacecraft inertia bounds are unknown. Adaptive update law is developed to obtain the bounds. Stability of closed loop system is analyzed using Lyapunove’s theory. The proposed control scheme gives smooth and efficient tracking performance. Robustness and effectiveness of the control law is proven through simulation results.","PeriodicalId":335329,"journal":{"name":"2019 16th International Bhurban Conference on Applied Sciences and Technology (IBCAST)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133555823","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 : 2019-01-01DOI: 10.1109/IBCAST.2019.8667192
He Xiping, Cui Xiaojuan, W. Yanjun, Ning jingfeng
In ultrasonic machining and processing or in underwater acoustics, the output end surface of a vibration system needs large amplitude to improve work efficiency. A uniform horn with a cuboid hole at front end is proposed for amplifying amplitude. The finite element method is used to calculate the displacement distribution, magnification factor of the output end surface and to optimize the geometrical size and the position of the cuboid hole at resonant frequency. The influence of position and geometrical size of the hole on resonant frequency of the horn is studied, and the maximum magnification factor can reach seven times greater than that of a uniform solid horn after optimization. The horn is connected to a longitudinal vibration transducer, the frequency, mode shape, displacement distribution of the output surface, and the amplitude magnification factor were measured by using a laser vibrometer. The experimental results were consistent with the analysis of the finite element calculation results. In addition, the test results also show that excitation voltage has a linear relationship with the output displacement of the horn.
{"title":"A high displacement ultrasonic horn with a cuboid hole in the front end","authors":"He Xiping, Cui Xiaojuan, W. Yanjun, Ning jingfeng","doi":"10.1109/IBCAST.2019.8667192","DOIUrl":"https://doi.org/10.1109/IBCAST.2019.8667192","url":null,"abstract":"In ultrasonic machining and processing or in underwater acoustics, the output end surface of a vibration system needs large amplitude to improve work efficiency. A uniform horn with a cuboid hole at front end is proposed for amplifying amplitude. The finite element method is used to calculate the displacement distribution, magnification factor of the output end surface and to optimize the geometrical size and the position of the cuboid hole at resonant frequency. The influence of position and geometrical size of the hole on resonant frequency of the horn is studied, and the maximum magnification factor can reach seven times greater than that of a uniform solid horn after optimization. The horn is connected to a longitudinal vibration transducer, the frequency, mode shape, displacement distribution of the output surface, and the amplitude magnification factor were measured by using a laser vibrometer. The experimental results were consistent with the analysis of the finite element calculation results. In addition, the test results also show that excitation voltage has a linear relationship with the output displacement of the horn.","PeriodicalId":335329,"journal":{"name":"2019 16th International Bhurban Conference on Applied Sciences and Technology (IBCAST)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133288757","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 : 2019-01-01DOI: 10.1109/IBCAST.2019.8667261
M. Ke, Zhang Jianfu, Feng Pingfa, Wu Zhijun, Yu Dingwen, Shahzad Ahmad
With great heat resistance, corrosion resistance, high specific strength and excellent mechanical properties, nomex honeycomb composites are widely used in aerospace industry. However, due to the special properties of the nomex honeycomb composites, traditional high-speed milling is difficult to complete the processing of the material. The ultrasonic processing method is one of the best ways to solve the above problem. In order to improve the ultrasonic power, the size of the ultrasound system structure is normally very large, which is inconvenient and uneconomical for processing the nomex honeycomb composites. A mini ultrasonic cutting system for paper - based honeycomb material is designed in this paper. Its output amplitude is realized under the condition of small size, and its processing performance is verified by experiments. Based on the theoretical anylysis, the design parameters of the presented mini ultrasonic cutting system were calculated. The resonant frequency, magnification and amplitude of the system were analyzing by simulation and amplitude test. The results showed the system parameters are consistent with the design value. The processing experiments of the honeycomb material indicated the system can effectively reduce the cutting force and improve the surface quality.
{"title":"Design and Implementation of a Mini Ultrasonic Cutting System for Nomex Honeycomb Composites","authors":"M. Ke, Zhang Jianfu, Feng Pingfa, Wu Zhijun, Yu Dingwen, Shahzad Ahmad","doi":"10.1109/IBCAST.2019.8667261","DOIUrl":"https://doi.org/10.1109/IBCAST.2019.8667261","url":null,"abstract":"With great heat resistance, corrosion resistance, high specific strength and excellent mechanical properties, nomex honeycomb composites are widely used in aerospace industry. However, due to the special properties of the nomex honeycomb composites, traditional high-speed milling is difficult to complete the processing of the material. The ultrasonic processing method is one of the best ways to solve the above problem. In order to improve the ultrasonic power, the size of the ultrasound system structure is normally very large, which is inconvenient and uneconomical for processing the nomex honeycomb composites. A mini ultrasonic cutting system for paper - based honeycomb material is designed in this paper. Its output amplitude is realized under the condition of small size, and its processing performance is verified by experiments. Based on the theoretical anylysis, the design parameters of the presented mini ultrasonic cutting system were calculated. The resonant frequency, magnification and amplitude of the system were analyzing by simulation and amplitude test. The results showed the system parameters are consistent with the design value. The processing experiments of the honeycomb material indicated the system can effectively reduce the cutting force and improve the surface quality.","PeriodicalId":335329,"journal":{"name":"2019 16th International Bhurban Conference on Applied Sciences and Technology (IBCAST)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116684287","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 : 2019-01-01DOI: 10.1109/IBCAST.2019.8667184
Abdul Basit, S. Y. Nusenu, Shujhat Khan, Waqar Khan, M. A. Khan, M. U. Farooq
In array beamforming, main lobe steering towards intended position and null placement towards interferers’ positions are the main objectives. Unfortunately, if some array elements fail to work, the array beamforming performance is seriously deteriorated. Therefore, detection of faulty array element and correction of beampattern are two different issues but are very inter-linked tasks that need to be developed for efficient beamforming performance. In literature, these two tasks have been thoroughly investigated, separately. However, in this paper, we propose an adaptive closed-loop joint faulty element detection and beam pattern correction design. Moreover, we are considering frequency diverse array (FDA) with Bat algorithm (BA) based beamformer to detect the faulty elements first and, consequently, correct the beampattern to impose nulls in the interferences range-angle positions. The range-angle based pattern nulls are obtained by controlling the weights of the remaining array elements. The convergence performance of the FDA with Bat algorithm design has been compared with that of genetic algorithm (GA) and particle swarm optimization (PSO), while SINR performance of healthy and faulty arrays is compared for an interference dominant case.
{"title":"Adaptive Detection and Correction of Faulty Elements in Frequency Diverse Array","authors":"Abdul Basit, S. Y. Nusenu, Shujhat Khan, Waqar Khan, M. A. Khan, M. U. Farooq","doi":"10.1109/IBCAST.2019.8667184","DOIUrl":"https://doi.org/10.1109/IBCAST.2019.8667184","url":null,"abstract":"In array beamforming, main lobe steering towards intended position and null placement towards interferers’ positions are the main objectives. Unfortunately, if some array elements fail to work, the array beamforming performance is seriously deteriorated. Therefore, detection of faulty array element and correction of beampattern are two different issues but are very inter-linked tasks that need to be developed for efficient beamforming performance. In literature, these two tasks have been thoroughly investigated, separately. However, in this paper, we propose an adaptive closed-loop joint faulty element detection and beam pattern correction design. Moreover, we are considering frequency diverse array (FDA) with Bat algorithm (BA) based beamformer to detect the faulty elements first and, consequently, correct the beampattern to impose nulls in the interferences range-angle positions. The range-angle based pattern nulls are obtained by controlling the weights of the remaining array elements. The convergence performance of the FDA with Bat algorithm design has been compared with that of genetic algorithm (GA) and particle swarm optimization (PSO), while SINR performance of healthy and faulty arrays is compared for an interference dominant case.","PeriodicalId":335329,"journal":{"name":"2019 16th International Bhurban Conference on Applied Sciences and Technology (IBCAST)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130167209","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 : 2019-01-01DOI: 10.1109/IBCAST.2019.8667219
A. Salam, Cheng Xiaoquan, Xiaoqinq Li, Altaf Ahmed, Zhuang Qikai
In this study, the bearing strength of carbon fiber reinforced composite to metal bolted joint was investigated experimentally and numerically. The ply sequence used in test specimen was [02/±45/02/±45/90/0]s. Seven specimens were manufactured and tested on Instron 8802 hydraulic testing machine for tensile properties. A 3D finite element model was developed in Abaqus/standard using C3D8R elements. Hashin and Tan failure and degradation rules were applied in VUSDFLD subroutine file to predict failure initiation and progression. The comparison of failure modes and bearing strength at room temperature and at 250°C is presented. Results obtained from simulation and tesing are in good agreement. The results shows that at room temperature, the bearing strength of this joint is around 60% more than that at 250°C.
{"title":"Bearing Failure Analysis of Carbon Fiber Reinforced Composite to Metal Bolted Joint at Elevated Temperature","authors":"A. Salam, Cheng Xiaoquan, Xiaoqinq Li, Altaf Ahmed, Zhuang Qikai","doi":"10.1109/IBCAST.2019.8667219","DOIUrl":"https://doi.org/10.1109/IBCAST.2019.8667219","url":null,"abstract":"In this study, the bearing strength of carbon fiber reinforced composite to metal bolted joint was investigated experimentally and numerically. The ply sequence used in test specimen was [02/±45/02/±45/90/0]s. Seven specimens were manufactured and tested on Instron 8802 hydraulic testing machine for tensile properties. A 3D finite element model was developed in Abaqus/standard using C3D8R elements. Hashin and Tan failure and degradation rules were applied in VUSDFLD subroutine file to predict failure initiation and progression. The comparison of failure modes and bearing strength at room temperature and at 250°C is presented. Results obtained from simulation and tesing are in good agreement. The results shows that at room temperature, the bearing strength of this joint is around 60% more than that at 250°C.","PeriodicalId":335329,"journal":{"name":"2019 16th International Bhurban Conference on Applied Sciences and Technology (IBCAST)","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125417067","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 : 2019-01-01DOI: 10.1109/IBCAST.2019.8667267
M. Ashfaq, Farooq Alam, S. Hussain
This paper proposes practical implementation of current sensor-less robust control technique for DC-DC boost converter. Close loop feedback control of DC-DC boost converter requires inductor current as feedback signal. However, inductor current requires expensive sensor for measurement which increases overall cost and complexity of system. To reduce cost, complexity and other associated problems we propose robust method for the estimation of inductor current by employing Higher Gain Observer (HGO). Furthermore, for robust control of output voltage control we used Non singular terminal sliding mode control (NTSMC). Moreover, proposed sensor-less control strategy is practically implemented using Field Programmable Gate Arrays (FPGA). It is shown by simulation that proposed system is robust under parametric variations and unknown disturbances.
{"title":"Practical Implementation of Sensorless Robust Control of Boost Converter","authors":"M. Ashfaq, Farooq Alam, S. Hussain","doi":"10.1109/IBCAST.2019.8667267","DOIUrl":"https://doi.org/10.1109/IBCAST.2019.8667267","url":null,"abstract":"This paper proposes practical implementation of current sensor-less robust control technique for DC-DC boost converter. Close loop feedback control of DC-DC boost converter requires inductor current as feedback signal. However, inductor current requires expensive sensor for measurement which increases overall cost and complexity of system. To reduce cost, complexity and other associated problems we propose robust method for the estimation of inductor current by employing Higher Gain Observer (HGO). Furthermore, for robust control of output voltage control we used Non singular terminal sliding mode control (NTSMC). Moreover, proposed sensor-less control strategy is practically implemented using Field Programmable Gate Arrays (FPGA). It is shown by simulation that proposed system is robust under parametric variations and unknown disturbances.","PeriodicalId":335329,"journal":{"name":"2019 16th International Bhurban Conference on Applied Sciences and Technology (IBCAST)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125289744","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 : 2019-01-01DOI: 10.1109/IBCAST.2019.8667228
Altaf Ahmed, Jia Guozhu, A. Salam, Muhammad Kashif Nawaz
Collaborative assembly is envisaged as a prospect of industry 4.0 which involves co-working between robot and human. This methodology combines the strength and dexterity of a robot with sensory skills of human to achieve quality and precision in the assembly process. The collaborative assembly has been in focus in recent times, however, less attention has been paid to its quality and reliability aspect. Since both human worker and robot add variation to the process, making it prone to inaccuracy, defects and, rejection, it is indispensable to assess its effectiveness in terms of quality and reliability. This paper presents an approach for reliability and quality control in a collaborative assembly process. In this regard, key characteristics of assembly and process parameters of both human and robot have been identified, and their influence on assembly quality is determined. The parameters analyzed using correlation and regression modeling. Based on the analysis of data and results, a sensitivity analysis is done, and a control mechanism is formulated. The proposed approach has been applied to a collaborative assembly process of an industrial case to exemplify it, and promising results have been obtained.
{"title":"Reliability and Quality Control Approach for Collaborative Assembly Process","authors":"Altaf Ahmed, Jia Guozhu, A. Salam, Muhammad Kashif Nawaz","doi":"10.1109/IBCAST.2019.8667228","DOIUrl":"https://doi.org/10.1109/IBCAST.2019.8667228","url":null,"abstract":"Collaborative assembly is envisaged as a prospect of industry 4.0 which involves co-working between robot and human. This methodology combines the strength and dexterity of a robot with sensory skills of human to achieve quality and precision in the assembly process. The collaborative assembly has been in focus in recent times, however, less attention has been paid to its quality and reliability aspect. Since both human worker and robot add variation to the process, making it prone to inaccuracy, defects and, rejection, it is indispensable to assess its effectiveness in terms of quality and reliability. This paper presents an approach for reliability and quality control in a collaborative assembly process. In this regard, key characteristics of assembly and process parameters of both human and robot have been identified, and their influence on assembly quality is determined. The parameters analyzed using correlation and regression modeling. Based on the analysis of data and results, a sensitivity analysis is done, and a control mechanism is formulated. The proposed approach has been applied to a collaborative assembly process of an industrial case to exemplify it, and promising results have been obtained.","PeriodicalId":335329,"journal":{"name":"2019 16th International Bhurban Conference on Applied Sciences and Technology (IBCAST)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122789801","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 : 2019-01-01DOI: 10.1109/IBCAST.2019.8667253
R. F. Latif, Nadeem Shafi Khan
Leakages not only add to the cost, they are also a great threat to the safety of men, machines and the environment as well. Seals and gaskets have evolved as a perfect solution to the problem of leakages. Amongst the various types of gaskets, hyperelastic gaskets have long maintained their dominance in the industrial as well as domestic appliances because of their characteristic advantages. Hyperelasticity is defined for ideally elastic materials by constitutive models where the relations of stress and strain are derived from the strain energy density function denoted by ‘W’ - a scalar-valued quantity that gives the relationship of a material’s strain energy density to its rate of deformation. The constitutive models that explain hyperelasticity, include older Neo-Hookean, Generalized Rivlin and Mooney-Rivlin models as well as Blatz-Ko, Ogden and Arruda-Boyce models. All these models are expressed through different interpretations of W . The selection of the model to be used amongst the mentioned constitutive models depends upon the types of materials and geometric and loading profiles for effective prediction of behavior and results. An effort has been made to present a comparative analysis of 16 hyperelastic models, which are different variants of Mooney Rivlin, Ogden, Blatz-Ko, Yeoh, Gent, Polynomial and Arruda Boyce models. In this study, the above-mentioned hyperelastic models are applied to examine the behavior of a neoprene gasket under uniaxial tensile loading. The study is concluded with determining a hyperelastic constitutive model that predicts with reasonable exactness and safety margin when less or no experimental data is available for the neoprene gasket.
{"title":"Comparative Analysis of Various Hyperelastic Models for Neoprene Gasket at Ranging Strains","authors":"R. F. Latif, Nadeem Shafi Khan","doi":"10.1109/IBCAST.2019.8667253","DOIUrl":"https://doi.org/10.1109/IBCAST.2019.8667253","url":null,"abstract":"Leakages not only add to the cost, they are also a great threat to the safety of men, machines and the environment as well. Seals and gaskets have evolved as a perfect solution to the problem of leakages. Amongst the various types of gaskets, hyperelastic gaskets have long maintained their dominance in the industrial as well as domestic appliances because of their characteristic advantages. Hyperelasticity is defined for ideally elastic materials by constitutive models where the relations of stress and strain are derived from the strain energy density function denoted by ‘W’ - a scalar-valued quantity that gives the relationship of a material’s strain energy density to its rate of deformation. The constitutive models that explain hyperelasticity, include older Neo-Hookean, Generalized Rivlin and Mooney-Rivlin models as well as Blatz-Ko, Ogden and Arruda-Boyce models. All these models are expressed through different interpretations of W . The selection of the model to be used amongst the mentioned constitutive models depends upon the types of materials and geometric and loading profiles for effective prediction of behavior and results. An effort has been made to present a comparative analysis of 16 hyperelastic models, which are different variants of Mooney Rivlin, Ogden, Blatz-Ko, Yeoh, Gent, Polynomial and Arruda Boyce models. In this study, the above-mentioned hyperelastic models are applied to examine the behavior of a neoprene gasket under uniaxial tensile loading. The study is concluded with determining a hyperelastic constitutive model that predicts with reasonable exactness and safety margin when less or no experimental data is available for the neoprene gasket.","PeriodicalId":335329,"journal":{"name":"2019 16th International Bhurban Conference on Applied Sciences and Technology (IBCAST)","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134041784","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 : 2019-01-01DOI: 10.1109/IBCAST.2019.8667158
Zaman Ahmad, M. H. Durad
Industrial control systems (ICS) are used to automate many industries like power generation, petroleum, manufacturing, traffic control etc. Increase in the use of IT (information technology) components in ICS introduces many new vulnerabilities. Security breach in ICS can cause serious damages and is threat to human life. Simulating Security threats and security controls for ICS can help to identify threats and mitigation in advance. This paper explain the construction of open source SCADA simulator which can be used for security testing. Building SCADA simulation using Omnet++ is discussed in detail. We also analyzed TCP Flood DDOS attack on power distribution system as case study.
{"title":"Development of SCADA Simulator using Omnet++","authors":"Zaman Ahmad, M. H. Durad","doi":"10.1109/IBCAST.2019.8667158","DOIUrl":"https://doi.org/10.1109/IBCAST.2019.8667158","url":null,"abstract":"Industrial control systems (ICS) are used to automate many industries like power generation, petroleum, manufacturing, traffic control etc. Increase in the use of IT (information technology) components in ICS introduces many new vulnerabilities. Security breach in ICS can cause serious damages and is threat to human life. Simulating Security threats and security controls for ICS can help to identify threats and mitigation in advance. This paper explain the construction of open source SCADA simulator which can be used for security testing. Building SCADA simulation using Omnet++ is discussed in detail. We also analyzed TCP Flood DDOS attack on power distribution system as case study.","PeriodicalId":335329,"journal":{"name":"2019 16th International Bhurban Conference on Applied Sciences and Technology (IBCAST)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134465411","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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