Pub Date : 2010-10-07DOI: 10.1109/ICMET.2010.5598437
R. K. Megalingam, Ramesh Nammily Nair, Sai Manoj Prakhya
In this paper, we suggest a method to intelligently detect an accident at any place and any time and report the same to the nearby ‘service provider’. The service provider arranges for the necessary help. Accident Detection and Reporting System (ADRS) which can be placed in any vehicle uses a sensor to detect the accident. The sensor output is monitored and processed by the PIC16F877A microcontroller. The microcontroller takes decision on the traffic accident based on the input from the sensors. The RF transmitter module which is interfaced with the microcontroller will transmit the accident information to the nearby Emergency Service Provider (ESP). This information is received by the RF receiver module at the ‘service provider’ control room in the locality. The RF transceiver module used has a range up to 100 meters under ideal conditions. The service provider can use this information to arrange for ambulance and also inform police and hospital. We used low cost RF modules, a microcontroller by Microchip, LCD module and an accelerometer. This system can be installed at accident prone areas to detect and report the same. MPLAB IDE and Proteus software are used to simulate part of the system. ADRS also implements an intelligent Accident Detection and Reporting Algorithm (ADRA) for the purpose.
{"title":"Wireless vehicular Accident Detection and Reporting System","authors":"R. K. Megalingam, Ramesh Nammily Nair, Sai Manoj Prakhya","doi":"10.1109/ICMET.2010.5598437","DOIUrl":"https://doi.org/10.1109/ICMET.2010.5598437","url":null,"abstract":"In this paper, we suggest a method to intelligently detect an accident at any place and any time and report the same to the nearby ‘service provider’. The service provider arranges for the necessary help. Accident Detection and Reporting System (ADRS) which can be placed in any vehicle uses a sensor to detect the accident. The sensor output is monitored and processed by the PIC16F877A microcontroller. The microcontroller takes decision on the traffic accident based on the input from the sensors. The RF transmitter module which is interfaced with the microcontroller will transmit the accident information to the nearby Emergency Service Provider (ESP). This information is received by the RF receiver module at the ‘service provider’ control room in the locality. The RF transceiver module used has a range up to 100 meters under ideal conditions. The service provider can use this information to arrange for ambulance and also inform police and hospital. We used low cost RF modules, a microcontroller by Microchip, LCD module and an accelerometer. This system can be installed at accident prone areas to detect and report the same. MPLAB IDE and Proteus software are used to simulate part of the system. ADRS also implements an intelligent Accident Detection and Reporting Algorithm (ADRA) for the purpose.","PeriodicalId":415118,"journal":{"name":"2010 International Conference on Mechanical and Electrical Technology","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129331169","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 : 2010-10-07DOI: 10.1109/ICMET.2010.5598384
Fan Lu, Si-zhong Chen, Zhicheng Wu, Lin Yang, Junwei Zhang, Junyan Li
Based on ISO standard 2631 and average absorbed power method, the data of half-load sand road test of EQ2050 are processed, and the overall weighted acceleration RMS and average absorbed power are calculated respectively. By using the least squares method, the relation between the two evaluation indexes is fitted and the estimation formula of average absorbed power is proposed. By changing the load of vehicle or the test road, the vehicle is tested and the accuracy is verified. The results show that the estimation formula is independent of loading and road and it can be used to realize the rapid estimation of average absorbed power of off-road vehicles.
{"title":"Research on relation between two evaluation methods of random input ride comfort for off-road vehicle","authors":"Fan Lu, Si-zhong Chen, Zhicheng Wu, Lin Yang, Junwei Zhang, Junyan Li","doi":"10.1109/ICMET.2010.5598384","DOIUrl":"https://doi.org/10.1109/ICMET.2010.5598384","url":null,"abstract":"Based on ISO standard 2631 and average absorbed power method, the data of half-load sand road test of EQ2050 are processed, and the overall weighted acceleration RMS and average absorbed power are calculated respectively. By using the least squares method, the relation between the two evaluation indexes is fitted and the estimation formula of average absorbed power is proposed. By changing the load of vehicle or the test road, the vehicle is tested and the accuracy is verified. The results show that the estimation formula is independent of loading and road and it can be used to realize the rapid estimation of average absorbed power of off-road vehicles.","PeriodicalId":415118,"journal":{"name":"2010 International Conference on Mechanical and Electrical Technology","volume":"126 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114505137","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 : 2010-10-07DOI: 10.1109/ICMET.2010.5598415
Ayan, Ankit, Aditya, Akhilesh, Nikhil
In today's world Global warming possesses a serious threat to mankind and society. An increase in global temperature variations is uncertain.
在当今世界，全球变暖对人类和社会构成了严重威胁。全球温度变化的增加是不确定的。
{"title":"Microcrystalline based TiO2 thin film in dye-synthesized solar cell for efficient artificial photosynthesis","authors":"Ayan, Ankit, Aditya, Akhilesh, Nikhil","doi":"10.1109/ICMET.2010.5598415","DOIUrl":"https://doi.org/10.1109/ICMET.2010.5598415","url":null,"abstract":"In today's world Global warming possesses a serious threat to mankind and society. An increase in global temperature variations is uncertain.","PeriodicalId":415118,"journal":{"name":"2010 International Conference on Mechanical and Electrical Technology","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122186674","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 : 2010-10-07DOI: 10.1109/ICMET.2010.5598431
B. Abdullah, S. K. Alias, A. Jaffar, Amirul Abd Rashid, A. Ramli
The purpose of this work was to compare the mechanical and physical properties for 0.5% Niobium alloyed ductile iron (0.5% Nb-DI) with commercial ductile iron (DI) before and after austempering process. The materials for this investigation were produced by conventional CO2 sand casting process and machined to TS EN 10001 standards for tensile test and ASTM E23 for Charpy impact test. Hardness test, density test and polarization test were also done to the samples. Microstructure observations were made after 2% Nital chemical etched and the fractured surfaces obtained through broken samples of tensile and impact test were evaluated through Scanning Electron Microscopy (SEM). The samples were austenitized at 900°C for 1 hour followed by austempered in a salt bath at 350°C for 3 different holding times which were 1 hour, 2 hours and 3 hours subsequently. The samples were then let cooled to room temperature. All testing were done before and after heat treatment process. The newly developed Nb alloyed DI possessed significant improvement in term of mechanical properties and corrosion behavior in comparison with pure ductile iron. Enhanced properties of the materials make them suitable for various technical and industrial applications.
本研究的目的是比较0.5%铌合金球墨铸铁(0.5% Nb-DI)和商用球墨铸铁(DI)在等温回火前后的力学和物理性能。本研究的材料采用传统的CO2砂铸造工艺生产，并按照TS EN 10001标准进行拉伸试验和ASTM E23标准进行夏比冲击试验。对样品进行了硬度测试、密度测试和极化测试。对2%镍酸盐化学腐蚀后的微观结构进行了观察，并对拉伸和冲击试验破碎样品的断裂表面进行了扫描电镜(SEM)评价。样品在900°C下奥氏体化1小时，然后在350°C盐浴中等温，分别保持1小时、2小时和3小时。然后将样品冷却到室温。所有试验均在热处理工艺前后进行。与纯球墨铸铁相比，新研制的铌合金DI在力学性能和腐蚀性能方面都有显著改善。增强的材料性能使其适用于各种技术和工业应用。
{"title":"Mechanical properties and microstructure analysis of 0.5% Niobium alloyed ductile iron under austempered process in salt bath treatment","authors":"B. Abdullah, S. K. Alias, A. Jaffar, Amirul Abd Rashid, A. Ramli","doi":"10.1109/ICMET.2010.5598431","DOIUrl":"https://doi.org/10.1109/ICMET.2010.5598431","url":null,"abstract":"The purpose of this work was to compare the mechanical and physical properties for 0.5% Niobium alloyed ductile iron (0.5% Nb-DI) with commercial ductile iron (DI) before and after austempering process. The materials for this investigation were produced by conventional CO2 sand casting process and machined to TS EN 10001 standards for tensile test and ASTM E23 for Charpy impact test. Hardness test, density test and polarization test were also done to the samples. Microstructure observations were made after 2% Nital chemical etched and the fractured surfaces obtained through broken samples of tensile and impact test were evaluated through Scanning Electron Microscopy (SEM). The samples were austenitized at 900°C for 1 hour followed by austempered in a salt bath at 350°C for 3 different holding times which were 1 hour, 2 hours and 3 hours subsequently. The samples were then let cooled to room temperature. All testing were done before and after heat treatment process. The newly developed Nb alloyed DI possessed significant improvement in term of mechanical properties and corrosion behavior in comparison with pure ductile iron. Enhanced properties of the materials make them suitable for various technical and industrial applications.","PeriodicalId":415118,"journal":{"name":"2010 International Conference on Mechanical and Electrical Technology","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115257325","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 : 2010-10-07DOI: 10.1109/ICMET.2010.5598473
L. Yunpeng, Xia Meiyun
Through the research of the existing heterogeneous database integration technologies, this paper presents a XML-based heterogeneous database information integration model, and analyzes the key technologies of it. Compared with traditional programs, this model has opening, simple achievement, low cost and other advantages.
{"title":"Research of heterogeneous database integration based on XML","authors":"L. Yunpeng, Xia Meiyun","doi":"10.1109/ICMET.2010.5598473","DOIUrl":"https://doi.org/10.1109/ICMET.2010.5598473","url":null,"abstract":"Through the research of the existing heterogeneous database integration technologies, this paper presents a XML-based heterogeneous database information integration model, and analyzes the key technologies of it. Compared with traditional programs, this model has opening, simple achievement, low cost and other advantages.","PeriodicalId":415118,"journal":{"name":"2010 International Conference on Mechanical and Electrical Technology","volume":"129 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122630374","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 : 2010-10-07DOI: 10.1109/ICMET.2010.5598368
Z. Wang, Z.B. Chen, J.W. Tan, Y. Jiao
Theoretical model of symmetrical constrained damping structure for railway wheel is established based on complex stiffness method. Four parameters are related to the noise-restraint performance of wheel with damping treatment, which are the thickness of constrained layer, the thickness of damping layer, the loss factor and the complex shear module of damping material. Optimal calculation in the frequency range of railway curve squeal noise is finished. TWINS model is used here to predict the sound pressure level of noise radiated by damping wheel, and comparison between theoretical and experimental results is finished, which indicate the noise radiated from wheel and whole structure can be reduced with 6.6dB(A) and 3.9dB(A).
{"title":"Optimal design and experimental research of railway wheels with constrained damping treatment","authors":"Z. Wang, Z.B. Chen, J.W. Tan, Y. Jiao","doi":"10.1109/ICMET.2010.5598368","DOIUrl":"https://doi.org/10.1109/ICMET.2010.5598368","url":null,"abstract":"Theoretical model of symmetrical constrained damping structure for railway wheel is established based on complex stiffness method. Four parameters are related to the noise-restraint performance of wheel with damping treatment, which are the thickness of constrained layer, the thickness of damping layer, the loss factor and the complex shear module of damping material. Optimal calculation in the frequency range of railway curve squeal noise is finished. TWINS model is used here to predict the sound pressure level of noise radiated by damping wheel, and comparison between theoretical and experimental results is finished, which indicate the noise radiated from wheel and whole structure can be reduced with 6.6dB(A) and 3.9dB(A).","PeriodicalId":415118,"journal":{"name":"2010 International Conference on Mechanical and Electrical Technology","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121579639","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 : 2010-10-07DOI: 10.1109/ICMET.2010.5598367
Ma Tianfei, Zuo Ankang, W. Dengfeng, Chen Shuming, Dong Junchao
the common theory of building rigid-elastic coupling model with component mode synthesis method is introduced simply. The rigid full vehicle model of some commercial vehicle was built with multi-body system simulation software MSC Adams/Car. According to the National Standard of China GB/T 4970-1996, the simulations in even speed for full-vehicle model on the national road level B were carried out. And its results are conformable to that of vehicle test on the proving ground, therefore, it proves that virtual prototype model is correct and believable. The deformation of the cab was considered and the flex cab template and rigid-elastic coupling model were built with the help of commercial FEA (finite element analysis) program Hyper-mesh and multi-body system simulation software MSC Adams/Car. Via the simulation and the results, the analysis of the effect of the flex cab to the ride comfort was carried out. It can conclude that a flexible multi-body dynamics is the efficient method to analyze the ride comfort of the vehicle. The deformation of the cab should be considered when the ride comfort is performed. A flexible multi-body dynamic model gives better results than a rigid body model, although it takes longer to construct.
{"title":"Ride comfort analysis of commercial vehicle using flexible multi-body and finite element methods","authors":"Ma Tianfei, Zuo Ankang, W. Dengfeng, Chen Shuming, Dong Junchao","doi":"10.1109/ICMET.2010.5598367","DOIUrl":"https://doi.org/10.1109/ICMET.2010.5598367","url":null,"abstract":"the common theory of building rigid-elastic coupling model with component mode synthesis method is introduced simply. The rigid full vehicle model of some commercial vehicle was built with multi-body system simulation software MSC Adams/Car. According to the National Standard of China GB/T 4970-1996, the simulations in even speed for full-vehicle model on the national road level B were carried out. And its results are conformable to that of vehicle test on the proving ground, therefore, it proves that virtual prototype model is correct and believable. The deformation of the cab was considered and the flex cab template and rigid-elastic coupling model were built with the help of commercial FEA (finite element analysis) program Hyper-mesh and multi-body system simulation software MSC Adams/Car. Via the simulation and the results, the analysis of the effect of the flex cab to the ride comfort was carried out. It can conclude that a flexible multi-body dynamics is the efficient method to analyze the ride comfort of the vehicle. The deformation of the cab should be considered when the ride comfort is performed. A flexible multi-body dynamic model gives better results than a rigid body model, although it takes longer to construct.","PeriodicalId":415118,"journal":{"name":"2010 International Conference on Mechanical and Electrical Technology","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127202458","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 : 2010-10-07DOI: 10.1109/ICMET.2010.5598382
Xiao-kang Yan, Li-jun Wang, Jing-song Zhang, Xin-yong Wang
The effect of rotor blade installation angle on the flow field and performance of axial flow fan is presented in this paper. CFD simulation and experimental investigations are carried out with different value of installation angle. First, the inner flow fields of axial fan were simulated and analyzed by using the RNG k-? turbulent model and sliding mesh method of Fluent 6.3 software. Then, a five-hole probe was employed to measure the inner flow field of axial fan, and the variation tendency of velocity and pressure in testing section are found in good agreement with numerical results. The research shows that: with the increasing of installation angle, the lower pressure area induced by impact loss decreases in pressure side, but if installation angle is reduced, the impact loss happened in suction side will be more serious and the wake loss will also be deteriorated. The average total pressure has a trend of markedly increasing at the outlet of rotor; Reversed flow will happen in blade pressure side when installation angle is smaller in off-design condition and the smaller the installation angle, the larger the reverse flow area. Volume flow rate, pressure and torque of fan present an increasing tendency in various degrees with increasing of installation angle, and the fan total efficiency increases at first and then decrease. The total efficiency reduces 3.77% with total pressure drops 23.7% under the decreasing installation angle of 11°, and the peak value arrived at design angle of installation.
{"title":"Numerical and experimental investigation on effect of installation angle of rotor blade on axial flow fan","authors":"Xiao-kang Yan, Li-jun Wang, Jing-song Zhang, Xin-yong Wang","doi":"10.1109/ICMET.2010.5598382","DOIUrl":"https://doi.org/10.1109/ICMET.2010.5598382","url":null,"abstract":"The effect of rotor blade installation angle on the flow field and performance of axial flow fan is presented in this paper. CFD simulation and experimental investigations are carried out with different value of installation angle. First, the inner flow fields of axial fan were simulated and analyzed by using the RNG k-? turbulent model and sliding mesh method of Fluent 6.3 software. Then, a five-hole probe was employed to measure the inner flow field of axial fan, and the variation tendency of velocity and pressure in testing section are found in good agreement with numerical results. The research shows that: with the increasing of installation angle, the lower pressure area induced by impact loss decreases in pressure side, but if installation angle is reduced, the impact loss happened in suction side will be more serious and the wake loss will also be deteriorated. The average total pressure has a trend of markedly increasing at the outlet of rotor; Reversed flow will happen in blade pressure side when installation angle is smaller in off-design condition and the smaller the installation angle, the larger the reverse flow area. Volume flow rate, pressure and torque of fan present an increasing tendency in various degrees with increasing of installation angle, and the fan total efficiency increases at first and then decrease. The total efficiency reduces 3.77% with total pressure drops 23.7% under the decreasing installation angle of 11°, and the peak value arrived at design angle of installation.","PeriodicalId":415118,"journal":{"name":"2010 International Conference on Mechanical and Electrical Technology","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127598549","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 : 2010-10-07DOI: 10.1109/ICMET.2010.5598447
Aliasgar, Omkar K Sastry, Sanketh B Hampapur, Sachin S Kamat, K. V. Vyshak
In the modern day world, the need for a more economical and safer means of increasing production in a manufacturing industry is vital. When humans operate on a press machine, there is lesser productivity due to fatigue. There is also a risk of them getting injured in the process. Hence there is a need to design a system which can address both these issues. The solution is automation. Replacing the ‘human-being’ by a simple machine is what we have done.
{"title":"Automated pick and place system","authors":"Aliasgar, Omkar K Sastry, Sanketh B Hampapur, Sachin S Kamat, K. V. Vyshak","doi":"10.1109/ICMET.2010.5598447","DOIUrl":"https://doi.org/10.1109/ICMET.2010.5598447","url":null,"abstract":"In the modern day world, the need for a more economical and safer means of increasing production in a manufacturing industry is vital. When humans operate on a press machine, there is lesser productivity due to fatigue. There is also a risk of them getting injured in the process. Hence there is a need to design a system which can address both these issues. The solution is automation. Replacing the ‘human-being’ by a simple machine is what we have done.","PeriodicalId":415118,"journal":{"name":"2010 International Conference on Mechanical and Electrical Technology","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127959857","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 : 2010-10-07DOI: 10.1109/ICMET.2010.5598424
T. Sethuramalingam, A. Vimalajuliet
MEMS are the manufacturing of a wide variety of items that are electronic and mechanical in nature. In addition to sensors, small motors, pumps, hydraulic systems, warhead fuses, high resolution displays, mass data storage devices are but a few of the devices that can be manufactured using MEMS technology. The characteristics of MEMS fabrication are miniaturization, multiplicity, and microelectronics. Miniaturization not only allows for small, lightweight devices, but these same devices have high resonant frequencies which mean higher operating frequencies and bandwidths for microsensors and microactuators. An accelerometer measures proper acceleration, which is the acceleration it experiences relative to freefall, and is the acceleration that is felt by people and objects. Such accelerations are popularly measured in terms of g-force. At any point in space time the equivalence principle guarantees the existence of a local inertial frame, and an accelerometer measures the acceleration relative to that frame. As a consequence an accelerometer at rest relative to the Earth's surface will indicate approximately 1 g upwards, because any point on the earth's surface is accelerating upwards relative to the local inertial frame, which would be the frame of a freely falling object at the surface. To obtain the pure acceleration due to motion with respect to the Earth, this “gravity offset” must be subtracted. This is generally true of any gravitational field, since gravity does not produce proper acceleration, and an accelerometer is not sensitive to it, and cannot measure it directly. An accelerometer behaves as a damped mass on a spring. When the accelerometer experiences acceleration, the mass is displaced to the point that the spring is able to accelerate the mass at the same rate as the casing. The displacement is then measured to give the acceleration. There are many different ways to make an accelerometer. Some accelerometers use the piezoelectric effect - they contain microscopic crystal structures that get stressed by accelerative forces, which cause a voltage to be generated. Another way to do it is by sensing changes in capacitance. Capacitive interfaces have several attractive features. In most micromachining technologies no or minimal additional processing is needed. Capacitors can operate both as sensors and actuators. They have excellent sensitivity and the transduction mechanism is intrinsically insensitive to temperature.
{"title":"Design of MEMS based capacitive accelerometer","authors":"T. Sethuramalingam, A. Vimalajuliet","doi":"10.1109/ICMET.2010.5598424","DOIUrl":"https://doi.org/10.1109/ICMET.2010.5598424","url":null,"abstract":"MEMS are the manufacturing of a wide variety of items that are electronic and mechanical in nature. In addition to sensors, small motors, pumps, hydraulic systems, warhead fuses, high resolution displays, mass data storage devices are but a few of the devices that can be manufactured using MEMS technology. The characteristics of MEMS fabrication are miniaturization, multiplicity, and microelectronics. Miniaturization not only allows for small, lightweight devices, but these same devices have high resonant frequencies which mean higher operating frequencies and bandwidths for microsensors and microactuators. An accelerometer measures proper acceleration, which is the acceleration it experiences relative to freefall, and is the acceleration that is felt by people and objects. Such accelerations are popularly measured in terms of g-force. At any point in space time the equivalence principle guarantees the existence of a local inertial frame, and an accelerometer measures the acceleration relative to that frame. As a consequence an accelerometer at rest relative to the Earth's surface will indicate approximately 1 g upwards, because any point on the earth's surface is accelerating upwards relative to the local inertial frame, which would be the frame of a freely falling object at the surface. To obtain the pure acceleration due to motion with respect to the Earth, this “gravity offset” must be subtracted. This is generally true of any gravitational field, since gravity does not produce proper acceleration, and an accelerometer is not sensitive to it, and cannot measure it directly. An accelerometer behaves as a damped mass on a spring. When the accelerometer experiences acceleration, the mass is displaced to the point that the spring is able to accelerate the mass at the same rate as the casing. The displacement is then measured to give the acceleration. There are many different ways to make an accelerometer. Some accelerometers use the piezoelectric effect - they contain microscopic crystal structures that get stressed by accelerative forces, which cause a voltage to be generated. Another way to do it is by sensing changes in capacitance. Capacitive interfaces have several attractive features. In most micromachining technologies no or minimal additional processing is needed. Capacitors can operate both as sensors and actuators. They have excellent sensitivity and the transduction mechanism is intrinsically insensitive to temperature.","PeriodicalId":415118,"journal":{"name":"2010 International Conference on Mechanical and Electrical Technology","volume":"144 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127301763","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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