Sandwich panels with truss cores offer possibilities for self-actuation. They are analyzed, with emphasis on mass optimal design for failure and stiffness. It is shown that introducing additional freedom in selecting the topology of tetrahedral or pyramidal cores, by 1) making the core units, or even all core members, disjoint, so varying the distance between core units becomes possible, 2) using multiple layers, brings significant advantages. For some conditions, the performance of the modified panel becomes better by a factor of two, causing actuated truss core panels to perform at least as well as, or even better than, panels with, e.g., honeycomb cores, that do not easily allow core actuation. A special case of the analysis is the mass optimal design of panels with 3D-Kagome truss units, which can be regarded as a special geometry for a tensegrity prism.
{"title":"Mass optimized self-actuated panels for several truss core topologies","authors":"B. D. Jager","doi":"10.1109/CDC.2006.377418","DOIUrl":"https://doi.org/10.1109/CDC.2006.377418","url":null,"abstract":"Sandwich panels with truss cores offer possibilities for self-actuation. They are analyzed, with emphasis on mass optimal design for failure and stiffness. It is shown that introducing additional freedom in selecting the topology of tetrahedral or pyramidal cores, by 1) making the core units, or even all core members, disjoint, so varying the distance between core units becomes possible, 2) using multiple layers, brings significant advantages. For some conditions, the performance of the modified panel becomes better by a factor of two, causing actuated truss core panels to perform at least as well as, or even better than, panels with, e.g., honeycomb cores, that do not easily allow core actuation. A special case of the analysis is the mass optimal design of panels with 3D-Kagome truss units, which can be regarded as a special geometry for a tensegrity prism.","PeriodicalId":411031,"journal":{"name":"IEEE Conference on Decision and Control","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117139720","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 : 2002-12-01DOI: 10.1109/CDC.2002.1185079
C. Kung, C. Yang
This paper investigates the implementation of nonlinear H/sub /spl infin// control theory for F-16 flight control system. The complete six degree-of-freedom nonlinear equations of motion for F-16 are considered directly for the design of the nonlinear H/sub /spl infin// flight controller by treating the longitudinal and lateral motions as a whole. The associated Hamilton-Jacobi partial differential inequality is solved analytically, resulting in a nonlinear H/sub /spl infin// controller with simple proportional feedback structure. Real aerodynamic data and engine data of F-16 are employed to determine the angles of control surface deflection from the nonlinear H/sub /spl infin// control command. Feasibility of tracking nonlinear H/sub /spl infin// control command by using F-16 actuator system is discussed in detail and the guaranteed stability and robustness or nonlinear H/sub /spl infin// flight control system implemented by F-16 actuators are confirmed over large flight envelope in a six degree-of-freedom flight simulator.
{"title":"F-16 nonlinear H∞ control","authors":"C. Kung, C. Yang","doi":"10.1109/CDC.2002.1185079","DOIUrl":"https://doi.org/10.1109/CDC.2002.1185079","url":null,"abstract":"This paper investigates the implementation of nonlinear H/sub /spl infin// control theory for F-16 flight control system. The complete six degree-of-freedom nonlinear equations of motion for F-16 are considered directly for the design of the nonlinear H/sub /spl infin// flight controller by treating the longitudinal and lateral motions as a whole. The associated Hamilton-Jacobi partial differential inequality is solved analytically, resulting in a nonlinear H/sub /spl infin// controller with simple proportional feedback structure. Real aerodynamic data and engine data of F-16 are employed to determine the angles of control surface deflection from the nonlinear H/sub /spl infin// control command. Feasibility of tracking nonlinear H/sub /spl infin// control command by using F-16 actuator system is discussed in detail and the guaranteed stability and robustness or nonlinear H/sub /spl infin// flight control system implemented by F-16 actuators are confirmed over large flight envelope in a six degree-of-freedom flight simulator.","PeriodicalId":411031,"journal":{"name":"IEEE Conference on Decision and Control","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122456257","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}
{"title":"H∞ estimation problems in discrete-time via J-spectral factorization","authors":"P. Colaneri, A. Ferrante","doi":"10.1109/.2001.980401","DOIUrl":"https://doi.org/10.1109/.2001.980401","url":null,"abstract":"","PeriodicalId":411031,"journal":{"name":"IEEE Conference on Decision and Control","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117146886","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}
{"title":"Nonlinear H∞ control: practicality of implementing the cheap sensor case","authors":"J. Helton, M. James, W. McEneaney","doi":"10.1109/.2001.980688","DOIUrl":"https://doi.org/10.1109/.2001.980688","url":null,"abstract":"","PeriodicalId":411031,"journal":{"name":"IEEE Conference on Decision and Control","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121156937","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}
This paper studies the problem of designing an H∞ fuzzy feedback control for a class of nonlinear systems. A nonlinear systems is first described by a continuous-time fuzzy system model under sampled output measurements. The premise variables of the fuzzy system model are allowed to be unavailable. We develop a technique for designing an H∞ fuzzy feedback control which globally stabilises this class of fuzzy system models. A design algorithm for constructing the H∞ fuzzy feedback controller is given. A numerical simulation example is given to show the potential of the proposed techniques.
{"title":"Fuzzy H∞ output feedback control of nonlinear systems under sampled measurements","authors":"S. Nguang, P. Shi","doi":"10.1109/.2001.980889","DOIUrl":"https://doi.org/10.1109/.2001.980889","url":null,"abstract":"This paper studies the problem of designing an H∞ fuzzy feedback control for a class of nonlinear systems. A nonlinear systems is first described by a continuous-time fuzzy system model under sampled output measurements. The premise variables of the fuzzy system model are allowed to be unavailable. We develop a technique for designing an H∞ fuzzy feedback control which globally stabilises this class of fuzzy system models. A design algorithm for constructing the H∞ fuzzy feedback controller is given. A numerical simulation example is given to show the potential of the proposed techniques.","PeriodicalId":411031,"journal":{"name":"IEEE Conference on Decision and Control","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127466258","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}
This paper presents a new method for developing robust tracking controllers for automatic landing systems. We first develop a linearized longitudinal model of the Boeing 747 commercial airplane together with models for the control actuators, wind gust, and wind shear. The H_ control provides robust stability against uncertainties caused by exogenous disturbances and signals noise. The stable inversion provides precision tracking. Both methods are integrated to satisfy both robust and exact tracking requirements for the automatic landing system. Based on the stable inversion technique, the desired altitude and airspeed trajectories are also designed. The numerical simulation results show that the proposed automatic landing system can exceed FAA (Federal Aviation Administration) requirements for Category III precision approach landing. Furthermore, the integrated system can achieve robust accurate tracking in the presence of measurement noises, wind gust, and wind shear with middle intensity. Compared with existing approaches, our method achieved higher precision with excellent robustness.
{"title":"Automatic landing control using H∞ control and stable inversion","authors":"Jun Che, Degang Chen","doi":"10.1109/.2001.980105","DOIUrl":"https://doi.org/10.1109/.2001.980105","url":null,"abstract":"This paper presents a new method for developing robust tracking controllers for automatic landing systems. We first develop a linearized longitudinal model of the Boeing 747 commercial airplane together with models for the control actuators, wind gust, and wind shear. The H_ control provides robust stability against uncertainties caused by exogenous disturbances and signals noise. The stable inversion provides precision tracking. Both methods are integrated to satisfy both robust and exact tracking requirements for the automatic landing system. Based on the stable inversion technique, the desired altitude and airspeed trajectories are also designed. The numerical simulation results show that the proposed automatic landing system can exceed FAA (Federal Aviation Administration) requirements for Category III precision approach landing. Furthermore, the integrated system can achieve robust accurate tracking in the presence of measurement noises, wind gust, and wind shear with middle intensity. Compared with existing approaches, our method achieved higher precision with excellent robustness.","PeriodicalId":411031,"journal":{"name":"IEEE Conference on Decision and Control","volume":"209 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134643839","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}
The problem of customer demand satisfaction in production systems with unreliable machines and finite finished goods buffers is addressed. The measure of customer demand satisfaction, referred to as the due-time performance (DTP), is characterized by the probability to ship to the customer a required number of parts during a fixed time interval. A method for DTP calculation is developed and applied within a case study.
{"title":"Customer demand satisfaction in production systems: a due-time performance approach","authors":"Jingshan Li, S. Meerkov","doi":"10.1109/CDC.2000.912796","DOIUrl":"https://doi.org/10.1109/CDC.2000.912796","url":null,"abstract":"The problem of customer demand satisfaction in production systems with unreliable machines and finite finished goods buffers is addressed. The measure of customer demand satisfaction, referred to as the due-time performance (DTP), is characterized by the probability to ship to the customer a required number of parts during a fixed time interval. A method for DTP calculation is developed and applied within a case study.","PeriodicalId":411031,"journal":{"name":"IEEE Conference on Decision and Control","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125044852","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}
Presents a control method which achieves autonomous obstacle avoidance for manipulators with rate constraints. More precisely, in order to achieve the autonomous obstacle avoidance, we exploit the freedom of the coordinate transformation for exact linearization of nonlinear systems. At the same time, we cope with the rate constraints by adopting the state-dependent time scale transformation. Furthermore, we apply this method to an actual 2-link robot manipulator, and evaluate its effectiveness by experiment, which is the most important part of the paper.
{"title":"Obstacle avoidance of manipulators with rate constraints","authors":"T. Sugie, Yutaka Kito, K. Fujimoto","doi":"10.1109/CDC.2000.912870","DOIUrl":"https://doi.org/10.1109/CDC.2000.912870","url":null,"abstract":"Presents a control method which achieves autonomous obstacle avoidance for manipulators with rate constraints. More precisely, in order to achieve the autonomous obstacle avoidance, we exploit the freedom of the coordinate transformation for exact linearization of nonlinear systems. At the same time, we cope with the rate constraints by adopting the state-dependent time scale transformation. Furthermore, we apply this method to an actual 2-link robot manipulator, and evaluate its effectiveness by experiment, which is the most important part of the paper.","PeriodicalId":411031,"journal":{"name":"IEEE Conference on Decision and Control","volume":"2011 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125634375","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}
We outline a method for optimal offline scheduling of a limited bandwidth communication channel that is used for control purposes. We study LQ-control of parallel control processes and describe how the theory for periodic control can be used for defining a cost functional that measures the performances of sampled data systems in relation to desired continuous time performances. This formulation results in a complex combinatorial optimization problem which is solved by exhaustive search and the solution can be viewed as an optimal allocation of the limited communication resources. The resulting optimal sequences are typically such that the sampling is nonuniform, but the control law is time varying and computed to take this nonuniform sampling into account. In an example, two inverted pendulums with different closed loop performances that share a common communication resource are studied. The resulting optimal sequences are in agreement with the intuitive idea that the sampling resources should be focused to where they are needed the most, that is, to the controller with the fastest closed loop characteristics.
{"title":"Scheduling of a limited communication channel for optimal control","authors":"H. Rehbinder, Martin Sanfridson","doi":"10.1109/CDC.2000.912907","DOIUrl":"https://doi.org/10.1109/CDC.2000.912907","url":null,"abstract":"We outline a method for optimal offline scheduling of a limited bandwidth communication channel that is used for control purposes. We study LQ-control of parallel control processes and describe how the theory for periodic control can be used for defining a cost functional that measures the performances of sampled data systems in relation to desired continuous time performances. This formulation results in a complex combinatorial optimization problem which is solved by exhaustive search and the solution can be viewed as an optimal allocation of the limited communication resources. The resulting optimal sequences are typically such that the sampling is nonuniform, but the control law is time varying and computed to take this nonuniform sampling into account. In an example, two inverted pendulums with different closed loop performances that share a common communication resource are studied. The resulting optimal sequences are in agreement with the intuitive idea that the sampling resources should be focused to where they are needed the most, that is, to the controller with the fastest closed loop characteristics.","PeriodicalId":411031,"journal":{"name":"IEEE Conference on Decision and Control","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124335401","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}
For a large class of robustness problems with uncertain parameter vector q confined to a box Q, there are many papers providing results along the following lines: The desired performance specification is robustly satisfied for all q /spl epsiv/ Q if and only if it is satisfied at each vertex q/sup i/ of Q. Since the number of vertices of Q explodes combinatorially with the dimension of q, the computation associated with the implementation of such results is often intractable. The main point of this paper is to introduce a new approach to such problems. To this end, the definition of approximate feasibility is introduced, and the theory which follows from this definition is vertex-free.
{"title":"On avoiding vertexization of robustness problems: the approximate feasibility concept","authors":"B. Barmish, P. Shcherbakov","doi":"10.1109/CDC.2000.911986","DOIUrl":"https://doi.org/10.1109/CDC.2000.911986","url":null,"abstract":"For a large class of robustness problems with uncertain parameter vector q confined to a box Q, there are many papers providing results along the following lines: The desired performance specification is robustly satisfied for all q /spl epsiv/ Q if and only if it is satisfied at each vertex q/sup i/ of Q. Since the number of vertices of Q explodes combinatorially with the dimension of q, the computation associated with the implementation of such results is often intractable. The main point of this paper is to introduce a new approach to such problems. To this end, the definition of approximate feasibility is introduced, and the theory which follows from this definition is vertex-free.","PeriodicalId":411031,"journal":{"name":"IEEE Conference on Decision and Control","volume":"177 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127313283","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：