Pub Date : 2021-06-30DOI: 10.15918/J.JBIT1004-0579.20125
Fan Zhi, Yigang Zhang, Xiang Zhou, Jing Zhang, Wu Lu
A new model-based method is proposed to improve the moving performance of the planar near-field scanning frame. First, the geometric error model of the planar near-field scanning frame is established based on homogeneous coordinate transformation and multi-body system theory. Then, 21 underdetermined parameters in the geometric error model are derived by using the laser interferometer measurement system with unique light path and configurations. Based on the established error model, online error compensation in combination with structural optimization are proposed to reduce geometric errors efficiently. Finally, the proposed method is utilized to derive a novel planar near-field scanning frame. Scanning planeness in XY plane with z = 10 mm is calculated by using the Monte Carlo simulation method, results show that the calculated scanning planeness satisfies demands for the planar near-filed scanning frame, which validates the effectiveness of the proposed method.
{"title":"New Model-Based Method to Improve the Moving Performance of the Planar Near-Field Scanning Frame","authors":"Fan Zhi, Yigang Zhang, Xiang Zhou, Jing Zhang, Wu Lu","doi":"10.15918/J.JBIT1004-0579.20125","DOIUrl":"https://doi.org/10.15918/J.JBIT1004-0579.20125","url":null,"abstract":"A new model-based method is proposed to improve the moving performance of the planar near-field scanning frame. First, the geometric error model of the planar near-field scanning frame is established based on homogeneous coordinate transformation and multi-body system theory. Then, 21 underdetermined parameters in the geometric error model are derived by using the laser interferometer measurement system with unique light path and configurations. Based on the established error model, online error compensation in combination with structural optimization are proposed to reduce geometric errors efficiently. Finally, the proposed method is utilized to derive a novel planar near-field scanning frame. Scanning planeness in XY plane with z = 10 mm is calculated by using the Monte Carlo simulation method, results show that the calculated scanning planeness satisfies demands for the planar near-filed scanning frame, which validates the effectiveness of the proposed method.","PeriodicalId":39252,"journal":{"name":"Journal of Beijing Institute of Technology (English Edition)","volume":"30 1","pages":"92-102"},"PeriodicalIF":0.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45986807","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 : 2021-06-30DOI: 10.15918/J.JBIT1004-0579.20112
Liminy Wu, H. Feng, Ziwei Zhang, Yao Wang, Boru Jia, X. Yan
A numerical model for energy flow calculation of the free piston internal combustion power system (FPICPS) was established, which was compared with the traditional internal combustion engine (IC engine) with the same structure and input conditions. The piston motion characteristics and energy transfer process of FPICPS are studied by numerical simulation method. The results show that the changes of cylinder pressure, temperature and piston motion characteristics of free piston engine (FP engine) lag behind those of IC engine, and the piston peak acceleration of the FP engine is approximately 2.8 times that of IC engine. The proportion of compression stroke and expansion stroke of IC engine is basically the same, while the expansion stroke of FP engine only accounts for 41.6% of the whole operating cycle. FP engine have obvious advantages in heat transfer and air leakage loss, their percentages are 11.82% and 0.83%, respectively. The percentage of indicated power in FP engine and IC engine are 27.44% and 25.98%, respectively. And 79.64% of FP engine indicated power is converted into the motor electromagnetic energy.
{"title":"Theoretical Modeling and Energy Conversion Process of Free Piston Internal Combustion Power System","authors":"Liminy Wu, H. Feng, Ziwei Zhang, Yao Wang, Boru Jia, X. Yan","doi":"10.15918/J.JBIT1004-0579.20112","DOIUrl":"https://doi.org/10.15918/J.JBIT1004-0579.20112","url":null,"abstract":"A numerical model for energy flow calculation of the free piston internal combustion power system (FPICPS) was established, which was compared with the traditional internal combustion engine (IC engine) with the same structure and input conditions. The piston motion characteristics and energy transfer process of FPICPS are studied by numerical simulation method. The results show that the changes of cylinder pressure, temperature and piston motion characteristics of free piston engine (FP engine) lag behind those of IC engine, and the piston peak acceleration of the FP engine is approximately 2.8 times that of IC engine. The proportion of compression stroke and expansion stroke of IC engine is basically the same, while the expansion stroke of FP engine only accounts for 41.6% of the whole operating cycle. FP engine have obvious advantages in heat transfer and air leakage loss, their percentages are 11.82% and 0.83%, respectively. The percentage of indicated power in FP engine and IC engine are 27.44% and 25.98%, respectively. And 79.64% of FP engine indicated power is converted into the motor electromagnetic energy.","PeriodicalId":39252,"journal":{"name":"Journal of Beijing Institute of Technology (English Edition)","volume":"30 1","pages":"35-43"},"PeriodicalIF":0.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44405693","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 : 2021-06-30DOI: 10.15918/J.JBIT1004-0579.20126
Baiyan Sun, Zhen Chen, Congzhe Gao, Liu Xiangdong
A power decoupling control for wind turbine converter based on series-connected modular multilevel converter (SCMMC) and open-winding permanent magnetic synchronous generator (OW-PMSG) is proposed in this paper. The phase dc links of the SCMMC are series connected and the windings of the OW-PMSG are independent, which is different from conventional MMC. To improve the robustness of the system under imbalanced power disturbance, an ac power decoupling control is proposed with perfect power independent control of the three phase power and phase dc-link voltages. Besides, multi-frequency-bandwidth proportional-resonant (MFBPR) controller in the abc stationary frame without coordinates transformation is presented, which simplifies the control of the SCMMC. The accurate current control is based on the MFBPR controller and it is easy to improve the quality of the current with this controller. The proposed power decoupling control is verified through simulation and a 3 kW laboratory prototype.
{"title":"Power Decoupling Control for Wind Turbine Converter Based on Series-Connected Modular Multilevel Converter","authors":"Baiyan Sun, Zhen Chen, Congzhe Gao, Liu Xiangdong","doi":"10.15918/J.JBIT1004-0579.20126","DOIUrl":"https://doi.org/10.15918/J.JBIT1004-0579.20126","url":null,"abstract":"A power decoupling control for wind turbine converter based on series-connected modular multilevel converter (SCMMC) and open-winding permanent magnetic synchronous generator (OW-PMSG) is proposed in this paper. The phase dc links of the SCMMC are series connected and the windings of the OW-PMSG are independent, which is different from conventional MMC. To improve the robustness of the system under imbalanced power disturbance, an ac power decoupling control is proposed with perfect power independent control of the three phase power and phase dc-link voltages. Besides, multi-frequency-bandwidth proportional-resonant (MFBPR) controller in the abc stationary frame without coordinates transformation is presented, which simplifies the control of the SCMMC. The accurate current control is based on the MFBPR controller and it is easy to improve the quality of the current with this controller. The proposed power decoupling control is verified through simulation and a 3 kW laboratory prototype.","PeriodicalId":39252,"journal":{"name":"Journal of Beijing Institute of Technology (English Edition)","volume":"30 1","pages":"159-170"},"PeriodicalIF":0.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49363990","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 : 2021-06-30DOI: 10.15918/J.JBIT1004-0579.20083
Z. Yao, Haiqing Cao
A novel finite time non-smooth controller of the second system with disturbances is proposed. Its stability is proved by homogeneous system theory, its strong disturbances rejection ability is studied by numerical simulation. The azimuth non-smooth compounded controller of the small float satellite antenna including the non-smooth feed-forward controller, non-smooth feedback controller and the non-smooth proportional and differential (PD) controller is applied to control the azimuth attitude of the antenna. The accurate disturbances estimation of the non-smooth feed-forward controller, the strong disturbances rejection of the non-smooth feedback controller and the rapid response of the non-smooth PD controller are studied. Experiments validate the azimuth non-smooth compounded controller of the small float satellite antenna can control the azimuth attitude of the antenna in time and guarantee the communication between the antenna and the target satellite with high quality.
{"title":"A Novel Non-smooth Controller of the Second Order System with Disturbances and Its Application","authors":"Z. Yao, Haiqing Cao","doi":"10.15918/J.JBIT1004-0579.20083","DOIUrl":"https://doi.org/10.15918/J.JBIT1004-0579.20083","url":null,"abstract":"A novel finite time non-smooth controller of the second system with disturbances is proposed. Its stability is proved by homogeneous system theory, its strong disturbances rejection ability is studied by numerical simulation. The azimuth non-smooth compounded controller of the small float satellite antenna including the non-smooth feed-forward controller, non-smooth feedback controller and the non-smooth proportional and differential (PD) controller is applied to control the azimuth attitude of the antenna. The accurate disturbances estimation of the non-smooth feed-forward controller, the strong disturbances rejection of the non-smooth feedback controller and the rapid response of the non-smooth PD controller are studied. Experiments validate the azimuth non-smooth compounded controller of the small float satellite antenna can control the azimuth attitude of the antenna in time and guarantee the communication between the antenna and the target satellite with high quality.","PeriodicalId":39252,"journal":{"name":"Journal of Beijing Institute of Technology (English Edition)","volume":"30 1","pages":"141-150"},"PeriodicalIF":0.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47652989","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 : 2021-06-30DOI: 10.15918/J.JBIT1004-0579.20088
Duan Yun, Yang Zhen, Ge Wenchao, Sun Yongduo
To determine and check explosive thermal vulnerability, cook-off test and vented pipe test are general methods in experimental research. Heating temperature and internal temperature real-time monitoring are important for experimental research. Aimed at the risk of the explosive thermal analysis and the portability of field environment test instrument, potable temperature monitoring system had been developed based on NI cDAQ hardware equipment. The monitoring system uses NI cDAQ 9184, NI Compact DAQ4, NI 9214 data acquisition module to realize the acquisition of the temperature data. The data transmission module uses wireless AP. The software developed by LabVIEW8.5 realizes the development of modules with the ability of data real-time display and data storage. The system had the advantage of small size, light weight, high precision, real-time and the ability of real-time measurement of explosive temperature change in 500 m far away. It is a reliable temperature test instrument for the study of explosive thermal analysis.
{"title":"Explosive Thermal Analysis Monitoring System Based on Virtual Instrument","authors":"Duan Yun, Yang Zhen, Ge Wenchao, Sun Yongduo","doi":"10.15918/J.JBIT1004-0579.20088","DOIUrl":"https://doi.org/10.15918/J.JBIT1004-0579.20088","url":null,"abstract":"To determine and check explosive thermal vulnerability, cook-off test and vented pipe test are general methods in experimental research. Heating temperature and internal temperature real-time monitoring are important for experimental research. Aimed at the risk of the explosive thermal analysis and the portability of field environment test instrument, potable temperature monitoring system had been developed based on NI cDAQ hardware equipment. The monitoring system uses NI cDAQ 9184, NI Compact DAQ4, NI 9214 data acquisition module to realize the acquisition of the temperature data. The data transmission module uses wireless AP. The software developed by LabVIEW8.5 realizes the development of modules with the ability of data real-time display and data storage. The system had the advantage of small size, light weight, high precision, real-time and the ability of real-time measurement of explosive temperature change in 500 m far away. It is a reliable temperature test instrument for the study of explosive thermal analysis.","PeriodicalId":39252,"journal":{"name":"Journal of Beijing Institute of Technology (English Edition)","volume":"30 1","pages":"218-224"},"PeriodicalIF":0.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48652907","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 : 2021-06-30DOI: 10.15918/J.JBIT1004-0579.20104
Fuhui Guo, P. Lu
A fault-tolerant control (FTC) scheme is proposed based on integral sliding mode(ISM) for attitude control of hypersonic re-entry vehicle (HRV) under partial loss of actuator effectiveness. First, the inner/outer loop mathematical model of HRV in the present of actuator failure is given with specific analysis on torque. Then prescribed performance approach is introduced to the ISM controller design by error transformation. Specifically, the transformation error rather than tracking error is chosen as the sliding variable to establish the sliding mode surface and reaching law. As a result, the attitude tracking error of HRV is limited into the expected range. Meanwhile, the transient process and the steady state behavior are both considered. Considering that the unknown fault information of actuator can cause adverse effect on HRV, an extended state observer(ESO) is adopted to estimate the unknown actuator failure. Thus the observer result is served as compensation for the loss of the controlled system performance. Simulation results show that the proposed scheme can fulfil the tracking task with prescribed performance.
{"title":"Hypersonic Re-entry Vehicle Fault-Tolerant Control Against Actuator Failure via Integral Sliding Mode","authors":"Fuhui Guo, P. Lu","doi":"10.15918/J.JBIT1004-0579.20104","DOIUrl":"https://doi.org/10.15918/J.JBIT1004-0579.20104","url":null,"abstract":"A fault-tolerant control (FTC) scheme is proposed based on integral sliding mode(ISM) for attitude control of hypersonic re-entry vehicle (HRV) under partial loss of actuator effectiveness. First, the inner/outer loop mathematical model of HRV in the present of actuator failure is given with specific analysis on torque. Then prescribed performance approach is introduced to the ISM controller design by error transformation. Specifically, the transformation error rather than tracking error is chosen as the sliding variable to establish the sliding mode surface and reaching law. As a result, the attitude tracking error of HRV is limited into the expected range. Meanwhile, the transient process and the steady state behavior are both considered. Considering that the unknown fault information of actuator can cause adverse effect on HRV, an extended state observer(ESO) is adopted to estimate the unknown actuator failure. Thus the observer result is served as compensation for the loss of the controlled system performance. Simulation results show that the proposed scheme can fulfil the tracking task with prescribed performance.","PeriodicalId":39252,"journal":{"name":"Journal of Beijing Institute of Technology (English Edition)","volume":"30 1","pages":"111-120"},"PeriodicalIF":0.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43169475","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 : 2021-06-30DOI: 10.15918/J.JBIT1004-0579.2021.022
Lei Shi, Zhen Huang, Xuefeng Feng
A novel efficient partial sharing channelization structure with odd and even stacking is designed and implemented. There are two special designs in the proposed structure. Firstly, by the intensive channel overlap design, for non-cooperative wideband signals, the proposed structure can achieve good parameter estimation accuracy and high probability of complete interception. Secondly, based on the partial sharing design developed in this paper, the computation burden of the proposed structure can be greatly reduced compared with the traditional directly implemented structures. Experiments and numerical simulations are conducted to evaluate the proposed structure, which shows its improvements over traditional methods in terms of field programmable gate arrays (FPGA) resource consumption and parameter estimation accuracy.
{"title":"Design and Implementation of Partial Shared Digital Channelized Receiver","authors":"Lei Shi, Zhen Huang, Xuefeng Feng","doi":"10.15918/J.JBIT1004-0579.2021.022","DOIUrl":"https://doi.org/10.15918/J.JBIT1004-0579.2021.022","url":null,"abstract":"A novel efficient partial sharing channelization structure with odd and even stacking is designed and implemented. There are two special designs in the proposed structure. Firstly, by the intensive channel overlap design, for non-cooperative wideband signals, the proposed structure can achieve good parameter estimation accuracy and high probability of complete interception. Secondly, based on the partial sharing design developed in this paper, the computation burden of the proposed structure can be greatly reduced compared with the traditional directly implemented structures. Experiments and numerical simulations are conducted to evaluate the proposed structure, which shows its improvements over traditional methods in terms of field programmable gate arrays (FPGA) resource consumption and parameter estimation accuracy.","PeriodicalId":39252,"journal":{"name":"Journal of Beijing Institute of Technology (English Edition)","volume":"30 1","pages":"186-193"},"PeriodicalIF":0.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43176116","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 : 2021-06-30DOI: 10.15918/J.JBIT1004-0579.20012
Wenjia Chen, Jinlin Li, He Wang, Yingjian Gao, S. Xin, Jinchuan Cao, Hao Li
Data mining techniques were utilized to improve the regional cardiovascular diseases (CVDs) prevention and in addition to find why rural residents are in worse statues of CVDs. Decision tree (DT) was chosen to build a high-risk CVDs people identification model, and the steps of identifying are reduced, with 99.4% precision in the classification. In comparison with the top 18 key features assessed by Random Forest, rural people were at higher risk due to the factors such as higher total cholesterol, blood glucose, blood pressure, body mass index(BMI) and waistline. Urban people had higher hypertensive historical prevalence but lower hypertensive comorbidity prevalence than rural people because of better control of high blood pressure. Smoking, drinking and medicine taking affected current blood pressure and lipid. More tobacco use of rural female and more alcohol intake of rural male can take part of responsibilities for worse CVDs prevalence and control in rural area. In the intervention and prevention of CVDs in a region, high-risk people should be more focused on. And rural and urban residents should be separately implemented with intervenable methods because of different disease history statues, control effect and current statue. Gender also should be considered when lifestyles are significantly different.
{"title":"High-Risk People Identification and Key Risk Factor Comparison of Cardiovascular Diseases in Northern China Rural and Urban Areas","authors":"Wenjia Chen, Jinlin Li, He Wang, Yingjian Gao, S. Xin, Jinchuan Cao, Hao Li","doi":"10.15918/J.JBIT1004-0579.20012","DOIUrl":"https://doi.org/10.15918/J.JBIT1004-0579.20012","url":null,"abstract":"Data mining techniques were utilized to improve the regional cardiovascular diseases (CVDs) prevention and in addition to find why rural residents are in worse statues of CVDs. Decision tree (DT) was chosen to build a high-risk CVDs people identification model, and the steps of identifying are reduced, with 99.4% precision in the classification. In comparison with the top 18 key features assessed by Random Forest, rural people were at higher risk due to the factors such as higher total cholesterol, blood glucose, blood pressure, body mass index(BMI) and waistline. Urban people had higher hypertensive historical prevalence but lower hypertensive comorbidity prevalence than rural people because of better control of high blood pressure. Smoking, drinking and medicine taking affected current blood pressure and lipid. More tobacco use of rural female and more alcohol intake of rural male can take part of responsibilities for worse CVDs prevalence and control in rural area. In the intervention and prevention of CVDs in a region, high-risk people should be more focused on. And rural and urban residents should be separately implemented with intervenable methods because of different disease history statues, control effect and current statue. Gender also should be considered when lifestyles are significantly different.","PeriodicalId":39252,"journal":{"name":"Journal of Beijing Institute of Technology (English Edition)","volume":"30 1","pages":"236-246"},"PeriodicalIF":0.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45273065","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 : 2021-06-30DOI: 10.15918/J.JBIT1004-0579.20069
Lijun Feng, Hao Yan
A nonlinear adaptive robust control method based on a differentiable LuGre friction model is proposed for the problems of uncertain parameters, nonlinear friction and time-varying disturbances in valve-controlled symmetrical cylinder system. The proposed method can effectively compensate the uncertain nonlinear characteristics and external disturbances in the system by combining adaptive robust control with state and disturbance observations, as well as sliding mode differential technique. The global stability and boundedness of the proposed control method are proven by applying the Lyapunov theory. The simulation results show that this control method can deal with the problems of the uncertain nonlinearities and disturbances within the system. The proposed control method also presents excellent dynamic performance and robustness.
{"title":"Nonlinear Adaptive Robust Control of Valve-Controlled Symmetrical Cylinder System","authors":"Lijun Feng, Hao Yan","doi":"10.15918/J.JBIT1004-0579.20069","DOIUrl":"https://doi.org/10.15918/J.JBIT1004-0579.20069","url":null,"abstract":"A nonlinear adaptive robust control method based on a differentiable LuGre friction model is proposed for the problems of uncertain parameters, nonlinear friction and time-varying disturbances in valve-controlled symmetrical cylinder system. The proposed method can effectively compensate the uncertain nonlinear characteristics and external disturbances in the system by combining adaptive robust control with state and disturbance observations, as well as sliding mode differential technique. The global stability and boundedness of the proposed control method are proven by applying the Lyapunov theory. The simulation results show that this control method can deal with the problems of the uncertain nonlinearities and disturbances within the system. The proposed control method also presents excellent dynamic performance and robustness.","PeriodicalId":39252,"journal":{"name":"Journal of Beijing Institute of Technology (English Edition)","volume":"30 1","pages":"171-178"},"PeriodicalIF":0.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41317987","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 : 2021-06-30DOI: 10.15918/J.JBIT1004-0579.20121
Bo Wang, Tao Wang
Pneumatic servo systems are affected by nonlinear factors, especially friction between the inner wall of the cylinder and the piston. The limit-cycle oscillation caused by friction can easily result in dead-zone nonlinearity in a pneumatic servo system, reducing the system performance and repeatability. In this study, the impact of friction, which has a negative influence on a pneumatic servo welding system, is effectively reduced by observing and compensating the friction. The system is treated as a pneumatic position/force servo system before and after contact between the welding gun electrodes. A reduced-order observer and a Kalman filter are applied to observe and estimate dynamic and static friction. Then friction is compensated by using feed-forward control. The experimental results show that a steady-state error of within 1.3% is achieved for a step signal.
{"title":"Observation and Compensation of Friction in a Pneumatic Servo Welding System","authors":"Bo Wang, Tao Wang","doi":"10.15918/J.JBIT1004-0579.20121","DOIUrl":"https://doi.org/10.15918/J.JBIT1004-0579.20121","url":null,"abstract":"Pneumatic servo systems are affected by nonlinear factors, especially friction between the inner wall of the cylinder and the piston. The limit-cycle oscillation caused by friction can easily result in dead-zone nonlinearity in a pneumatic servo system, reducing the system performance and repeatability. In this study, the impact of friction, which has a negative influence on a pneumatic servo welding system, is effectively reduced by observing and compensating the friction. The system is treated as a pneumatic position/force servo system before and after contact between the welding gun electrodes. A reduced-order observer and a Kalman filter are applied to observe and estimate dynamic and static friction. Then friction is compensated by using feed-forward control. The experimental results show that a steady-state error of within 1.3% is achieved for a step signal.","PeriodicalId":39252,"journal":{"name":"Journal of Beijing Institute of Technology (English Edition)","volume":"30 1","pages":"103-110"},"PeriodicalIF":0.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45111581","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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