Pub Date : 2006-05-08DOI: 10.1109/ISSCAA.2006.1627642
Yalan Xu, Jianjun Chen, Xiaobing Wang
This paper develops linear fractional representations for uncertain flexible structures with non-collocated piezoelectric actuators and sensors in the modal space, taking into account uncertainties due to modal parameters variation and un-modeled residual high-frequency modes. Using linear matrix inequality, a dynamic output feedback controller is designed to suppress the vibration due to external disturbances by setting an upper bound on H-infinity norm from the disturbances to given performance outputs. In order to achieve a specified decay rate and damping ratio in all controlled modes, and achieve the desired dynamic response, closed-loop poles of the uncertain system are placed in the desired region. Finally, robust H-infinity method with uncertain poles assignment is compared with robust H-infinity method by a simple example. The simulation results show that, without obviously scarifying state-steady characteristics of the system, excellent dynamic response can be obtained by considering uncertain poles assignment in robust H-infinity vibration control
{"title":"Robust vibration control of uncertain flexible structures with poles placement","authors":"Yalan Xu, Jianjun Chen, Xiaobing Wang","doi":"10.1109/ISSCAA.2006.1627642","DOIUrl":"https://doi.org/10.1109/ISSCAA.2006.1627642","url":null,"abstract":"This paper develops linear fractional representations for uncertain flexible structures with non-collocated piezoelectric actuators and sensors in the modal space, taking into account uncertainties due to modal parameters variation and un-modeled residual high-frequency modes. Using linear matrix inequality, a dynamic output feedback controller is designed to suppress the vibration due to external disturbances by setting an upper bound on H-infinity norm from the disturbances to given performance outputs. In order to achieve a specified decay rate and damping ratio in all controlled modes, and achieve the desired dynamic response, closed-loop poles of the uncertain system are placed in the desired region. Finally, robust H-infinity method with uncertain poles assignment is compared with robust H-infinity method by a simple example. The simulation results show that, without obviously scarifying state-steady characteristics of the system, excellent dynamic response can be obtained by considering uncertain poles assignment in robust H-infinity vibration control","PeriodicalId":275436,"journal":{"name":"2006 1st International Symposium on Systems and Control in Aerospace and Astronautics","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127753935","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 : 2006-05-08DOI: 10.1109/ISSCAA.2006.1627509
Liang He, A. Wu, G. Duan
New LMI criteria for L2 - Linfin and Hinfin performances of continuous-time uncertain systems are proposed, which keep the Lyapunov matrices out of any product with the system matrices. When used in robust mixed L2 - Linfin and filtering, the design conservatism is reduced since the restriction is removed that both L2 - Linfin and Hinfin performances are enforced by a single closed-loop Lyapunov matrix
{"title":"Enhanced mixed L/sub 2/ - L/sub /spl infin///H/sub /spl infin// filtering for continuous-time uncertain systems","authors":"Liang He, A. Wu, G. Duan","doi":"10.1109/ISSCAA.2006.1627509","DOIUrl":"https://doi.org/10.1109/ISSCAA.2006.1627509","url":null,"abstract":"New LMI criteria for L<sub>2</sub> - L<sub>infin</sub> and H<sub>infin</sub> performances of continuous-time uncertain systems are proposed, which keep the Lyapunov matrices out of any product with the system matrices. When used in robust mixed L<sub>2</sub> - L<sub>infin</sub> and filtering, the design conservatism is reduced since the restriction is removed that both L<sub>2</sub> - L<sub>infin </sub> and H<sub>infin</sub> performances are enforced by a single closed-loop Lyapunov matrix","PeriodicalId":275436,"journal":{"name":"2006 1st International Symposium on Systems and Control in Aerospace and Astronautics","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126279471","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 : 2006-05-08DOI: 10.1109/ISSCAA.2006.1627571
Zhiqiang Zou, Lihong Xu, Meng Yuan
Terminal constrained set and computational efficiency are extremely important in infinite horizon robust constrained model predictive control. Here, a polytopic invariant terminal set with arbitrary numbers of vertices and associated feedback law are presented instead of polytopic invariant terminal set with fixed numbers of vertices or partially invariant set, which could significantly enlarge the terminal set. At each sampling instant, select the smallest invariant set containing current state and implement corresponding feedback control law based on a sequence of polytopic invariant set constructed off-line one within another. Since no optimization is involved expect for a simple computation according to the vertices of the polytope, which can satisfy the demand of large scale systems and fast processes
{"title":"Off-line robust constrained MPC with stable polytopic invariant set","authors":"Zhiqiang Zou, Lihong Xu, Meng Yuan","doi":"10.1109/ISSCAA.2006.1627571","DOIUrl":"https://doi.org/10.1109/ISSCAA.2006.1627571","url":null,"abstract":"Terminal constrained set and computational efficiency are extremely important in infinite horizon robust constrained model predictive control. Here, a polytopic invariant terminal set with arbitrary numbers of vertices and associated feedback law are presented instead of polytopic invariant terminal set with fixed numbers of vertices or partially invariant set, which could significantly enlarge the terminal set. At each sampling instant, select the smallest invariant set containing current state and implement corresponding feedback control law based on a sequence of polytopic invariant set constructed off-line one within another. Since no optimization is involved expect for a simple computation according to the vertices of the polytope, which can satisfy the demand of large scale systems and fast processes","PeriodicalId":275436,"journal":{"name":"2006 1st International Symposium on Systems and Control in Aerospace and Astronautics","volume":"112 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128099657","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 : 2006-05-08DOI: 10.1109/ISSCAA.2006.1627707
Jian Zhang, Jin Dai
Overall frameworks of agent-based autonomous control of distributed satellite systems (DSS) are put forward. Till now, study on spacecraft autonomy at home and abroad is still in the early stage, and there are not any guidelines or frameworks to follow. We hold that it is necessary and feasible to adopt complex adaptive system (CAS) theory to instruct the research on autonomous control of DSS. The frameworks cover three aspects of theoretical foundations, technical routes and implementation methodologies. Basic concepts and kernel thoughts of CAS theory are introduced briefly; Main process to realize autonomy of DSS is discussed and Agent-based methods including design and evaluation method, modeling method, satellite autonomy architecture and autonomous mechanisms of physical and behavioral characteristics are investigated. Conclusions and future work schemes are given in the end
{"title":"Frameworks of agent-based autonomous control of autonomous satellite systems","authors":"Jian Zhang, Jin Dai","doi":"10.1109/ISSCAA.2006.1627707","DOIUrl":"https://doi.org/10.1109/ISSCAA.2006.1627707","url":null,"abstract":"Overall frameworks of agent-based autonomous control of distributed satellite systems (DSS) are put forward. Till now, study on spacecraft autonomy at home and abroad is still in the early stage, and there are not any guidelines or frameworks to follow. We hold that it is necessary and feasible to adopt complex adaptive system (CAS) theory to instruct the research on autonomous control of DSS. The frameworks cover three aspects of theoretical foundations, technical routes and implementation methodologies. Basic concepts and kernel thoughts of CAS theory are introduced briefly; Main process to realize autonomy of DSS is discussed and Agent-based methods including design and evaluation method, modeling method, satellite autonomy architecture and autonomous mechanisms of physical and behavioral characteristics are investigated. Conclusions and future work schemes are given in the end","PeriodicalId":275436,"journal":{"name":"2006 1st International Symposium on Systems and Control in Aerospace and Astronautics","volume":"105 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115979343","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 : 2006-05-08DOI: 10.1109/ISSCAA.2006.1627474
Chunmei Zhang, B. Ma, Heping Liu, Shujin Chen
This paper presents an approach to direct self-control of permanent magnet synchronous motor (PMSM). This method is based on neural networks. The neural network is used to select the switching state of the inverter. In order to reduce the training patterns and increase the execution speed of the training process, the inputs of switching table is converted to digital signals, i.e., one bit represent the flux error, one bit the torque error and three bits the region of stator flux. The proposed three-layer neural network controller contains only twelve neurons in an attempt to minimize computational requirements of the digital signal processor. Computer simulations of the permanent magnet synchronous motor and neural network system are presented. The simulations results show that it is possible to replace switching table of the direct self-control (DSC) for permanent magnet synchronous motor by a neural network controller and the system using this neural networks controller has quickly parallel speed and high torque response
{"title":"A new approach to direct torque control of interior permanent magnet synchronous motor","authors":"Chunmei Zhang, B. Ma, Heping Liu, Shujin Chen","doi":"10.1109/ISSCAA.2006.1627474","DOIUrl":"https://doi.org/10.1109/ISSCAA.2006.1627474","url":null,"abstract":"This paper presents an approach to direct self-control of permanent magnet synchronous motor (PMSM). This method is based on neural networks. The neural network is used to select the switching state of the inverter. In order to reduce the training patterns and increase the execution speed of the training process, the inputs of switching table is converted to digital signals, i.e., one bit represent the flux error, one bit the torque error and three bits the region of stator flux. The proposed three-layer neural network controller contains only twelve neurons in an attempt to minimize computational requirements of the digital signal processor. Computer simulations of the permanent magnet synchronous motor and neural network system are presented. The simulations results show that it is possible to replace switching table of the direct self-control (DSC) for permanent magnet synchronous motor by a neural network controller and the system using this neural networks controller has quickly parallel speed and high torque response","PeriodicalId":275436,"journal":{"name":"2006 1st International Symposium on Systems and Control in Aerospace and Astronautics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130193535","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 : 2006-05-08DOI: 10.1109/ISSCAA.2006.1627546
Xiaoping Zhou, Zhujing Wang, Longhan Cao, YangXin She
In order to improve the delay performance of CFDAMA (combined free/demand assignment multiple access) protocol with ON-OFF traffic, a novel satellite multiple access scheme called CFDAMA-CFA, employing the combined weighted/round robin free assignment strategy, is proposed in the paper. The delay performances between CFDAMA-CFA and CFDAMA-PA were compared by computer simulation. Simulations were carried out with IPP (interrupted Poisson process) and IFP (interrupted fluid process) traffic. Simulation results demonstrate that compared to CFDAMA-PA protocol, CFDAMA-CFA achieves a lower delay and meets a much lower delay constraint
{"title":"Performance of CFDAMA-CFA multiple access protocol via satellite","authors":"Xiaoping Zhou, Zhujing Wang, Longhan Cao, YangXin She","doi":"10.1109/ISSCAA.2006.1627546","DOIUrl":"https://doi.org/10.1109/ISSCAA.2006.1627546","url":null,"abstract":"In order to improve the delay performance of CFDAMA (combined free/demand assignment multiple access) protocol with ON-OFF traffic, a novel satellite multiple access scheme called CFDAMA-CFA, employing the combined weighted/round robin free assignment strategy, is proposed in the paper. The delay performances between CFDAMA-CFA and CFDAMA-PA were compared by computer simulation. Simulations were carried out with IPP (interrupted Poisson process) and IFP (interrupted fluid process) traffic. Simulation results demonstrate that compared to CFDAMA-PA protocol, CFDAMA-CFA achieves a lower delay and meets a much lower delay constraint","PeriodicalId":275436,"journal":{"name":"2006 1st International Symposium on Systems and Control in Aerospace and Astronautics","volume":"183 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134209473","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 : 2006-05-08DOI: 10.1109/ISSCAA.2006.1627659
Hao Chen, Ye Zhang, Liguo Wang
In the transmission of JPEG2000-coded remote sensing image (RSI), errors occurring in the codestream may result in the loss of the high-frequency information of RSI. A new method based on constraint net (CN) is proposed for error recovery of the high-frequency information. The CN of a wavelet coefficient block represents the relationships between each coefficient and its neighborhoods. The wavelet coefficient block has proved to be determined by its CN and surrounding neighboring coefficients. By using the correlation of inter-bands and the preservation property of edge feature and texture structure in high-resolution and low-resolution subbands, the CN of the damaged code-block that causes the loss of high-frequency information is computed. Together with the surrounding neighboring coefficients, the CN is used to recover the damaged code-block. Experimental results show the high-frequency information is well recovered and the quality of the reconstructed image is significantly improved
{"title":"Constraint net based error recovery for high-frequency information of remote sensing image in JPEG2000 transmission","authors":"Hao Chen, Ye Zhang, Liguo Wang","doi":"10.1109/ISSCAA.2006.1627659","DOIUrl":"https://doi.org/10.1109/ISSCAA.2006.1627659","url":null,"abstract":"In the transmission of JPEG2000-coded remote sensing image (RSI), errors occurring in the codestream may result in the loss of the high-frequency information of RSI. A new method based on constraint net (CN) is proposed for error recovery of the high-frequency information. The CN of a wavelet coefficient block represents the relationships between each coefficient and its neighborhoods. The wavelet coefficient block has proved to be determined by its CN and surrounding neighboring coefficients. By using the correlation of inter-bands and the preservation property of edge feature and texture structure in high-resolution and low-resolution subbands, the CN of the damaged code-block that causes the loss of high-frequency information is computed. Together with the surrounding neighboring coefficients, the CN is used to recover the damaged code-block. Experimental results show the high-frequency information is well recovered and the quality of the reconstructed image is significantly improved","PeriodicalId":275436,"journal":{"name":"2006 1st International Symposium on Systems and Control in Aerospace and Astronautics","volume":"79 1-4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131491012","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 : 2006-05-08DOI: 10.1109/ISSCAA.2006.1627550
Lei Fu, Guanzhong Dai
Along with the extensive applications of computers and networks in the field of industrial control, the switched Ethernet and TCP/IP are increasing to be an important research domain. However, how to preserve the favorable stability and performance is getting more and more important when the error of time synchronization is caused by the nondeterministic network-induced delay in the networked control system. According to the analysis to the architecture of the networked control system based on the switched Ethernet, the time delay characteristics of it are presented in detail. And then the time synchronization architecture of networked control system confirmed by the simulation results is proposed
{"title":"Delay characteristics and synchronization architecture of networked control system","authors":"Lei Fu, Guanzhong Dai","doi":"10.1109/ISSCAA.2006.1627550","DOIUrl":"https://doi.org/10.1109/ISSCAA.2006.1627550","url":null,"abstract":"Along with the extensive applications of computers and networks in the field of industrial control, the switched Ethernet and TCP/IP are increasing to be an important research domain. However, how to preserve the favorable stability and performance is getting more and more important when the error of time synchronization is caused by the nondeterministic network-induced delay in the networked control system. According to the analysis to the architecture of the networked control system based on the switched Ethernet, the time delay characteristics of it are presented in detail. And then the time synchronization architecture of networked control system confirmed by the simulation results is proposed","PeriodicalId":275436,"journal":{"name":"2006 1st International Symposium on Systems and Control in Aerospace and Astronautics","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133074014","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 : 2006-05-08DOI: 10.1109/ISSCAA.2006.1627431
Yue Hu, Shuchen Li, Chunyan Zhai, Jun Xiao
A simple modified Smith predictor controller design is proposed for integrating processes with long dead-time. The overall control structure introduce two physically meaningful tuning parameters. One is used to set the speed of the closed-loop servo response and the other is used to set the performance of the load response. A simple controller tuning method is also developed to obtain the PI tuning parameters. With a given estimation of the uncertainty bound of the dead-time, the stability region of the tuning parameter can be estimated. Two examples are used to demonstrate the improved closed-loop performance of the proposed controller design
{"title":"A modified control algorithm for integrating processes with long dead-time","authors":"Yue Hu, Shuchen Li, Chunyan Zhai, Jun Xiao","doi":"10.1109/ISSCAA.2006.1627431","DOIUrl":"https://doi.org/10.1109/ISSCAA.2006.1627431","url":null,"abstract":"A simple modified Smith predictor controller design is proposed for integrating processes with long dead-time. The overall control structure introduce two physically meaningful tuning parameters. One is used to set the speed of the closed-loop servo response and the other is used to set the performance of the load response. A simple controller tuning method is also developed to obtain the PI tuning parameters. With a given estimation of the uncertainty bound of the dead-time, the stability region of the tuning parameter can be estimated. Two examples are used to demonstrate the improved closed-loop performance of the proposed controller design","PeriodicalId":275436,"journal":{"name":"2006 1st International Symposium on Systems and Control in Aerospace and Astronautics","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133478747","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 : 2006-05-08DOI: 10.1109/ISSCAA.2006.1627469
Li Yuan, Zhichun Mu, Ying Liu
Ear recognition is proved to be a new and promising subject in biometrics authentication. As the ear is located at the side face, it is reasonable to combine ear with face profile for recognition in such scenarios as frontal face images are not available. Face profile is an important aspect of face recognition, it provides a complementary structure of the face that is seen in nonprofile view. In a profile image, the profile silhouette and the ear are two biometrics that can be used for authentication. In this paper, the face profile silhouette is combined with the ear to form a multimodal image, and a full-space linear discriminant analysis (FSLDA) is applied for recognition. Experiments are performed on USTB multimodal image database. The recognition rate of 96.2% on 79 subjects proves the efficiency of FSLDA method and the feasibility of ear and face profile combined image for personal authentication
{"title":"Multimodal recognition using face profile and ear","authors":"Li Yuan, Zhichun Mu, Ying Liu","doi":"10.1109/ISSCAA.2006.1627469","DOIUrl":"https://doi.org/10.1109/ISSCAA.2006.1627469","url":null,"abstract":"Ear recognition is proved to be a new and promising subject in biometrics authentication. As the ear is located at the side face, it is reasonable to combine ear with face profile for recognition in such scenarios as frontal face images are not available. Face profile is an important aspect of face recognition, it provides a complementary structure of the face that is seen in nonprofile view. In a profile image, the profile silhouette and the ear are two biometrics that can be used for authentication. In this paper, the face profile silhouette is combined with the ear to form a multimodal image, and a full-space linear discriminant analysis (FSLDA) is applied for recognition. Experiments are performed on USTB multimodal image database. The recognition rate of 96.2% on 79 subjects proves the efficiency of FSLDA method and the feasibility of ear and face profile combined image for personal authentication","PeriodicalId":275436,"journal":{"name":"2006 1st International Symposium on Systems and Control in Aerospace and Astronautics","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133593310","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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