Pub Date : 2010-11-11DOI: 10.1109/ISSCAA.2010.5633186
Yun Guo, Gong Cheng, Zeng Heyi
Parallel-channel two-phase flow systems with ocean conditions suffer from very serious parallel instability, depending on the inherent characteristic of each channel and operating conditions. The influences of ocean conditions on the instability of parallel channel are very intensive. The trajectories of mass flow are very complex, sometimes even chaos occurs. In this paper, Fast Fourier Transformation (FFT) method is used to analyze the curve of mass flow. Based on this method a complex oscillation curve can be decomposed. Some basic motion and inherent characteristics can be shown by the decomposition. The onset of inherent parallel instability is also analyzed.
{"title":"The application of signal analysis in the nuclear power system under ocean conditions","authors":"Yun Guo, Gong Cheng, Zeng Heyi","doi":"10.1109/ISSCAA.2010.5633186","DOIUrl":"https://doi.org/10.1109/ISSCAA.2010.5633186","url":null,"abstract":"Parallel-channel two-phase flow systems with ocean conditions suffer from very serious parallel instability, depending on the inherent characteristic of each channel and operating conditions. The influences of ocean conditions on the instability of parallel channel are very intensive. The trajectories of mass flow are very complex, sometimes even chaos occurs. In this paper, Fast Fourier Transformation (FFT) method is used to analyze the curve of mass flow. Based on this method a complex oscillation curve can be decomposed. Some basic motion and inherent characteristics can be shown by the decomposition. The onset of inherent parallel instability is also analyzed.","PeriodicalId":324652,"journal":{"name":"2010 3rd International Symposium on Systems and Control in Aeronautics and Astronautics","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114324600","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 : 2010-11-11DOI: 10.1109/ISSCAA.2010.5632494
C. Wang, Boran Li
Being affected by materials of manufacturing and transmitting, materials processing and working environment, Hemispherical resonator gyro(HRG) inevitable contains severe noise which serious contaminates the gyro accuracy. In this paper, the HRG noise performances are described by using two different techniques, Power Spectral Density(PSD) and Allan Variance, after analyzing the HRG output signal. On this basis, the theory of wavelet filtering is proposed to process the gyro signal and the filtering effects of different methods are compared each other. The result indicates that the wavelet filtering effectively denoises the gyro output signal and improves the gyro accuracy.
{"title":"The application of wavelet filtering on denoising hemispherical resonator gyro signal","authors":"C. Wang, Boran Li","doi":"10.1109/ISSCAA.2010.5632494","DOIUrl":"https://doi.org/10.1109/ISSCAA.2010.5632494","url":null,"abstract":"Being affected by materials of manufacturing and transmitting, materials processing and working environment, Hemispherical resonator gyro(HRG) inevitable contains severe noise which serious contaminates the gyro accuracy. In this paper, the HRG noise performances are described by using two different techniques, Power Spectral Density(PSD) and Allan Variance, after analyzing the HRG output signal. On this basis, the theory of wavelet filtering is proposed to process the gyro signal and the filtering effects of different methods are compared each other. The result indicates that the wavelet filtering effectively denoises the gyro output signal and improves the gyro accuracy.","PeriodicalId":324652,"journal":{"name":"2010 3rd International Symposium on Systems and Control in Aeronautics and Astronautics","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134207025","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 : 2010-06-08DOI: 10.1109/ISSCAA.2010.5632218
Hai-ming Chen, Zhi Xiong, Rong Wang, Jianye Liu
To meet the need of high-precision navigation for HALE(high-altitude long-endurance) UAV(unmanned aerial vehicle), multi-sensor fault-tolerant autonomous navigation system was researched. For the shortcoming that the GPS signal is easily interfered by electromagnetic techniques, combining sundry integrated navigation patterns such as the INS/CNS integrated navigation, the INS/SAR (Synthetic Aperture Radar) integrated navigation, and other autonomous navigation system, the fault-tolerant federated filter scheme is proposed in this paper. This scheme can effectively take advantage of multi-sensor information redundancy. When the GPS system failure occurred, the system can effectively detect and isolate the corresponding failure subsystem, and at this time the INS/CNS integrated navigation system plays a leading role in the navigation system to maintain a certain degree of navigation accuracy. By importing the SAR-aided navigation system in the terminal, the system can achieve high-precision navigation positioning. The integrated navigation system can detecte failure in rapid speed, so it has a high application value in practical engineering. The simulation results by covariance analysis show that the proposed navigation scheme is feasible, and this navigation scheme has important theoretical reference value to improve accuracy and reliability of integrated navigation system for the HALE UAV.
{"title":"Research on scheme and algorithm of high-precision fault-tolerant integrated navigation for HALE UAV","authors":"Hai-ming Chen, Zhi Xiong, Rong Wang, Jianye Liu","doi":"10.1109/ISSCAA.2010.5632218","DOIUrl":"https://doi.org/10.1109/ISSCAA.2010.5632218","url":null,"abstract":"To meet the need of high-precision navigation for HALE(high-altitude long-endurance) UAV(unmanned aerial vehicle), multi-sensor fault-tolerant autonomous navigation system was researched. For the shortcoming that the GPS signal is easily interfered by electromagnetic techniques, combining sundry integrated navigation patterns such as the INS/CNS integrated navigation, the INS/SAR (Synthetic Aperture Radar) integrated navigation, and other autonomous navigation system, the fault-tolerant federated filter scheme is proposed in this paper. This scheme can effectively take advantage of multi-sensor information redundancy. When the GPS system failure occurred, the system can effectively detect and isolate the corresponding failure subsystem, and at this time the INS/CNS integrated navigation system plays a leading role in the navigation system to maintain a certain degree of navigation accuracy. By importing the SAR-aided navigation system in the terminal, the system can achieve high-precision navigation positioning. The integrated navigation system can detecte failure in rapid speed, so it has a high application value in practical engineering. The simulation results by covariance analysis show that the proposed navigation scheme is feasible, and this navigation scheme has important theoretical reference value to improve accuracy and reliability of integrated navigation system for the HALE UAV.","PeriodicalId":324652,"journal":{"name":"2010 3rd International Symposium on Systems and Control in Aeronautics and Astronautics","volume":"223 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115315294","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 : 2010-06-08DOI: 10.1109/ISSCAA.2010.5632630
Qiang Guo, Liu Ya-jun, Changhong Wang, Wan Jian
To effectively detect and recognize multi-component Linear Frequency-Modulated(LFM) emitter signals, a multi-component LFM emitter signal analysis method based on the Independent Component Analysis(ICA) which was combined with the Wigner-Hough transform was proposed. The idea which was adopted to this method was the time-domain separation and then time-frequency analysis, and in the low SNR cases, the problem which is generally plagued by noised of feature extraction of multi-component LFM signal based on Wigner-Hough transform is overcame. Compared to the traditional method of time-frequency analysis, the computer simulation results show that the proposed method for the multi-component LFM signal separation and feature extraction was better.
{"title":"A new analysis method for multi-component Linear Frequency Modulated emitter signals","authors":"Qiang Guo, Liu Ya-jun, Changhong Wang, Wan Jian","doi":"10.1109/ISSCAA.2010.5632630","DOIUrl":"https://doi.org/10.1109/ISSCAA.2010.5632630","url":null,"abstract":"To effectively detect and recognize multi-component Linear Frequency-Modulated(LFM) emitter signals, a multi-component LFM emitter signal analysis method based on the Independent Component Analysis(ICA) which was combined with the Wigner-Hough transform was proposed. The idea which was adopted to this method was the time-domain separation and then time-frequency analysis, and in the low SNR cases, the problem which is generally plagued by noised of feature extraction of multi-component LFM signal based on Wigner-Hough transform is overcame. Compared to the traditional method of time-frequency analysis, the computer simulation results show that the proposed method for the multi-component LFM signal separation and feature extraction was better.","PeriodicalId":324652,"journal":{"name":"2010 3rd International Symposium on Systems and Control in Aeronautics and Astronautics","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117216947","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 : 2010-06-08DOI: 10.1109/ISSCAA.2010.5632398
Zhiqin Cai, Jun Zhao, Haijun Peng, Zhaohui Qi
A new nonlinear optimal tracking control method is proposed and analyzed which stabilizes a class of unstable periodic orbits near collinear libration points. Since such libration point orbits are, in general, unstable, spacecraft moving on these orbits must use some form of trajectory control to remain close to their nominal paths. In this study, the control law based on optimal control theory gives a closed-form suboptimal feedback solution to solve this nonlinear control problem. For the case of an unstable orbit which has in space the shape of a curved eight in the Hill restricted three-body problem, we find that the actual trajectory tracks a nominal orbit given in the form of the Fourier series with good accuracy. It is shown that the control acceleration can be provided by a low-thrust engine and that the total fuel cost of the control can be quite reasonable.
{"title":"Nonlinear station-keeping control of unstable orbits near collinear libration points","authors":"Zhiqin Cai, Jun Zhao, Haijun Peng, Zhaohui Qi","doi":"10.1109/ISSCAA.2010.5632398","DOIUrl":"https://doi.org/10.1109/ISSCAA.2010.5632398","url":null,"abstract":"A new nonlinear optimal tracking control method is proposed and analyzed which stabilizes a class of unstable periodic orbits near collinear libration points. Since such libration point orbits are, in general, unstable, spacecraft moving on these orbits must use some form of trajectory control to remain close to their nominal paths. In this study, the control law based on optimal control theory gives a closed-form suboptimal feedback solution to solve this nonlinear control problem. For the case of an unstable orbit which has in space the shape of a curved eight in the Hill restricted three-body problem, we find that the actual trajectory tracks a nominal orbit given in the form of the Fourier series with good accuracy. It is shown that the control acceleration can be provided by a low-thrust engine and that the total fuel cost of the control can be quite reasonable.","PeriodicalId":324652,"journal":{"name":"2010 3rd International Symposium on Systems and Control in Aeronautics and Astronautics","volume":"135 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127350400","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 : 2010-06-08DOI: 10.1109/ISSCAA.2010.5633072
Zhipeng Wu, Xing-lin Chen, Wen-hua Hua, Jia Wang
Wafer stage control system of step-scan lithography is a typical dual-stage system. Fine actuator ensures the high tracking precision and coarse actuator makes large-stroke movement to keep the fine actuator is not closed to saturation. PQ method is an effective technique for transforming a DISO system to two SISO systems. Two correlative controllers are designed for the parallel SISO systems which determine the bandwidths of coarse system and fine system, and the relative actuator contribution can be controlled. The third controller is used to ensure that the whole system is stable and the servo bandwidth is high enough. S-curve signal tracking simulation results show that the performance of whole wafer stage control system is satisfactory, and sine signal tracking simulation results show that coarse system and fine system can respectively respond low frequency large-stroke and high frequency short-stroke signal using one closed loop.
{"title":"Design of coarse-fine control system for wafer stage of lithography using PQ method","authors":"Zhipeng Wu, Xing-lin Chen, Wen-hua Hua, Jia Wang","doi":"10.1109/ISSCAA.2010.5633072","DOIUrl":"https://doi.org/10.1109/ISSCAA.2010.5633072","url":null,"abstract":"Wafer stage control system of step-scan lithography is a typical dual-stage system. Fine actuator ensures the high tracking precision and coarse actuator makes large-stroke movement to keep the fine actuator is not closed to saturation. PQ method is an effective technique for transforming a DISO system to two SISO systems. Two correlative controllers are designed for the parallel SISO systems which determine the bandwidths of coarse system and fine system, and the relative actuator contribution can be controlled. The third controller is used to ensure that the whole system is stable and the servo bandwidth is high enough. S-curve signal tracking simulation results show that the performance of whole wafer stage control system is satisfactory, and sine signal tracking simulation results show that coarse system and fine system can respectively respond low frequency large-stroke and high frequency short-stroke signal using one closed loop.","PeriodicalId":324652,"journal":{"name":"2010 3rd International Symposium on Systems and Control in Aeronautics and Astronautics","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123267521","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 : 2010-06-08DOI: 10.1109/ISSCAA.2010.5632718
Yuehua Cheng, B. Jiang, Yanping Fu, Z. Gao
This paper presents a robust sensor fault diagnosis and compensation scheme for satellite attitude dynamics with perturbations. The satellite attitude dynamics is linearized at the operating points with T-S fuzzy model. By introducing sensor fault as an auxiliary state vector, an augmented descriptor system is constructed. Fault diagnosis and estimation is achieved with a robust fuzzy descriptor observer by linear matrix inequality approach. Furthermore, sensor compensation is performed by subtracting the estimated term from measurement output. The effectiveness of the proposed robust diagnosis and compensation method is validated via simulation study.
{"title":"Robust sensor fault diagnosis for satellite attitude control system based on Fuzzy Descriptor System approach","authors":"Yuehua Cheng, B. Jiang, Yanping Fu, Z. Gao","doi":"10.1109/ISSCAA.2010.5632718","DOIUrl":"https://doi.org/10.1109/ISSCAA.2010.5632718","url":null,"abstract":"This paper presents a robust sensor fault diagnosis and compensation scheme for satellite attitude dynamics with perturbations. The satellite attitude dynamics is linearized at the operating points with T-S fuzzy model. By introducing sensor fault as an auxiliary state vector, an augmented descriptor system is constructed. Fault diagnosis and estimation is achieved with a robust fuzzy descriptor observer by linear matrix inequality approach. Furthermore, sensor compensation is performed by subtracting the estimated term from measurement output. The effectiveness of the proposed robust diagnosis and compensation method is validated via simulation study.","PeriodicalId":324652,"journal":{"name":"2010 3rd International Symposium on Systems and Control in Aeronautics and Astronautics","volume":"452 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123277143","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 : 2010-06-08DOI: 10.1109/ISSCAA.2010.5633295
Jianwei Cheng, Xiaoxian Yao, Zhiyuan Yu
Fuzzy sliding mode controller based on trending law for electric actuator is proposed in this paper. The sliding mode is used to enhance the robustness of the system, the trending law is used to improve the system dynamic characteristics of reaching the sliding surface, and the fuzzy tuning schemes are employed to reduce the chattering problem around the sliding surface. The integral sliding mode controller with exponential reaching law was developed. And the parameters of the exponential trending law were configured by fuzzy control rule. The method is applied to the control of an electric actuator. And the results of the simulation verify the validity of the proposed approaches.
{"title":"Fuzzy sliding mode controller based on trending law for electric actuator","authors":"Jianwei Cheng, Xiaoxian Yao, Zhiyuan Yu","doi":"10.1109/ISSCAA.2010.5633295","DOIUrl":"https://doi.org/10.1109/ISSCAA.2010.5633295","url":null,"abstract":"Fuzzy sliding mode controller based on trending law for electric actuator is proposed in this paper. The sliding mode is used to enhance the robustness of the system, the trending law is used to improve the system dynamic characteristics of reaching the sliding surface, and the fuzzy tuning schemes are employed to reduce the chattering problem around the sliding surface. The integral sliding mode controller with exponential reaching law was developed. And the parameters of the exponential trending law were configured by fuzzy control rule. The method is applied to the control of an electric actuator. And the results of the simulation verify the validity of the proposed approaches.","PeriodicalId":324652,"journal":{"name":"2010 3rd International Symposium on Systems and Control in Aeronautics and Astronautics","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126760886","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 : 2010-06-08DOI: 10.1109/ISSCAA.2010.5633207
G. Chesi
A key problem in automatic control consists of investigating robust stability of systems with uncertainty. This paper considers linear systems with rational dependence on time-invariant uncertainties constrained in the simplex. It is shown that a sufficient condition for establishing whether the system is either stable or unstable can be obtained by solving a generalized eigenvalue problem constructed through homogeneous parameter-dependent quadratic Lyapunov functions (HPD-QLFs). Moreover, it is shown that this condition is also necessary for establishing either stability or instability by using a sufficiently large degree of the HPD-QLF. Some numerical examples illustrate the use of the proposed approach in both cases of continuous-time and discrete-time uncertain systems.
{"title":"On the robust stability of continuous-time and discrete-time time-invariant uncertain systems with rational dependence on the uncertainty: A non-conservative condition","authors":"G. Chesi","doi":"10.1109/ISSCAA.2010.5633207","DOIUrl":"https://doi.org/10.1109/ISSCAA.2010.5633207","url":null,"abstract":"A key problem in automatic control consists of investigating robust stability of systems with uncertainty. This paper considers linear systems with rational dependence on time-invariant uncertainties constrained in the simplex. It is shown that a sufficient condition for establishing whether the system is either stable or unstable can be obtained by solving a generalized eigenvalue problem constructed through homogeneous parameter-dependent quadratic Lyapunov functions (HPD-QLFs). Moreover, it is shown that this condition is also necessary for establishing either stability or instability by using a sufficiently large degree of the HPD-QLF. Some numerical examples illustrate the use of the proposed approach in both cases of continuous-time and discrete-time uncertain systems.","PeriodicalId":324652,"journal":{"name":"2010 3rd International Symposium on Systems and Control in Aeronautics and Astronautics","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122755743","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 : 2010-06-08DOI: 10.1109/ISSCAA.2010.5633101
Hong-Xin Shen
A Gauss pseudospectral method (GPM) is presented for directly solving impulsive orbit transfer problem. The Gauss pseudospectral method is applied to the multi-phase optimal control problem; the model of multi-phase control linkage conditions and more flexible solving strategy are also presented. Two typical orbit transfer problems are studied, the simulation results are compared with the available numerical prediction, and show good accuracy, rapid convergence(time consumption is several seconds), robustness with initial guess, which means that the GPM can used to generate an optimal impulsive orbit transfer trajectory through the onboard computer.
{"title":"A novel algorithm for optimal design of impulsive orbit transfer using multi-phase Gauss pseudospectral method","authors":"Hong-Xin Shen","doi":"10.1109/ISSCAA.2010.5633101","DOIUrl":"https://doi.org/10.1109/ISSCAA.2010.5633101","url":null,"abstract":"A Gauss pseudospectral method (GPM) is presented for directly solving impulsive orbit transfer problem. The Gauss pseudospectral method is applied to the multi-phase optimal control problem; the model of multi-phase control linkage conditions and more flexible solving strategy are also presented. Two typical orbit transfer problems are studied, the simulation results are compared with the available numerical prediction, and show good accuracy, rapid convergence(time consumption is several seconds), robustness with initial guess, which means that the GPM can used to generate an optimal impulsive orbit transfer trajectory through the onboard computer.","PeriodicalId":324652,"journal":{"name":"2010 3rd International Symposium on Systems and Control in Aeronautics and Astronautics","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122441947","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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