检索结果-内蒙古大学图书馆

Use of Control Systems in the Correction of Static and Thermal Aberrations

JOURNAL OF SURFACE INVESTIGATION 2023年第SUPPL 1期17卷 S244-S249页

作者： Petrakov, E. V. Chkhalo, N. I. Russian Acad Sci Inst Phys Microstruct Nizhnii Novgorod 603950 Russia

Growth in the power of laser systems and synchrotron emitters increases the need for adaptive optical systems to form wavefronts of the required quality. The correction of static aberrations is implemented using deformable mirrors, and phase distortions due to the heating of active elements (bumps) are corrected by cooling radiator systems. Mirrors are deformed either by a system of a large number of piezoelectric actuators, which, when voltage is applied, generate transverse forces of the order of kN and displacements of tens of microns, or by means of attached piezoelectric bimorphs, which create a small bending moment (about 1 N m), but have the ability to move by millimeters. The number of degrees of freedom of a deformable mirror is related to the number of piezoelectric drives, and, accordingly, to the complexity of theoretical and practical implementation. In the course of this work, we will consider the problem of static aberrations and distortions due to heating as a control problem using a system of piezoelectric bimorphs and piezoelectric actuators. To search for the optimal parameters of the actuators, the method of optimization of sequential quadratic programming will be used, which satisfies the limitations of piezoelectric actuators. The standard deviation for the entire reflective element relative to the required shape will be taken as the minimization criterion.

关键词： adaptive optical systems phase distortions deformable mirrors piezoelectric bimorphs piezoelectric actuators sequential quadratic programming thermal aberrations static aberrations optimization mathematical model of deformation synchrotron radiation laser systems

来源：评论

学校读者我要写书评

暂无评论

Erratum: An SQP Algorithm for Finely Discretized Continuous Minimax Problems and Other Minimax Problems with Many Objective Functions

引用

SIAM Journal on Optimization 1998年第1期8卷 284-285页

作者： Jian L. Zhou André L. Tits

An error is pointed out in the local convergence proof in the quoted paper [J. L. Zhou and A. L. Tits, SIAM J. Optim., 6 (1996), pp. 461--487]. A correct proof is given.

An error is pointed out in the local convergence proof in the quoted paper [J. L. Zhou and A. L. Tits, SIAM J. Optim., 6 (1996), pp. 461--487]. A correct proof is given.

关键词： 49M07 49M37 49M39 65K05 90C06 90C30 90C34 continuous minimax semi-infinite programming many constraints sequential quadratic programming discretization global convergence

来源：评论

学校读者我要写书评

暂无评论

Research on Parameter Identification Method Based on Finite Measurement Information for Photovoltaic Array Model 33

Research on Parameter Identification Method Based on Finite ...

引用

33rd Chinese Control Conference (CCC)

作者： Li Zongjian Chen Yuling Fang Weichao Zhang Zhengjiang Zeng Guoqiang Dai Yuxing Wenzhou Univ Coll Phys & Elect Informat Engn Wenzhou 325035 Peoples R China

ISBN: (纸本)9781479947249

The photovoltaic array is a main part of photovoltaic generation system. It is significant to research on the exact model for the purposes of control and optimization in the entire photovoltaic power generation system. Based on the existing model of photovoltaic array, a parameter identification method is proposed, which makes use of finite measurement information to estimate the parameters of a photovoltaic array model. A parameter identification problem is constructed for the photovoltaic array model, and a sequential quadratic programming method for the problem is introduced. This method can make the mathematical model be consistent with the actual object. In the numerical simulations and experiments, the photovoltaic battery plate temperature and light intensity are treated as unknown parameters, and then parameter identification problem is constructed and solved by using the output current and voltage measurement information of the actual photovoltaic system with different conditions. The identification of the unknown parameters is achieved and the minimum deviations between outputs of the identified model and actual measurement information are obtained. The effectiveness of the proposed method can be demonstrated by the results of numerical simulations and experiments.

关键词： photovoltaic array mathematical model parameter identification sequential quadratic programming

来源：评论

学校读者我要写书评

暂无评论

Discrete Mechanics for 1-dimensional Distributed Parameter Mechanical Systems under Free Boundary Conditions and Its Application to Vibration Suppression Control of Free-fixed Strings 56

Discrete Mechanics for 1-dimensional Distributed Parameter M...

引用

56th Annual Conference of the Society-of-Instrument-and-Control-Engineers-of-Japan (SICE)

作者： Kai, Tatsuya Yamaki, Kouhei Tokyo Univ Sci Grad Sch Ind Sci & Technol Tokyo Japan

ISBN: (纸本)9784907764579

This study develops discrete mechanics for 1-dimensional distributed parameter mechanical systems under free boundary conditions, and a control method for the systems based on a blending method of discrete mechanics and nonlinear optimization. First, under the assumption on free boundary conditions, discrete Euler-Lagrange equations and boundary equations are derived by discrete Hamilton's principle. Next, for the discrete Euler-Lagrange equations with control inputs and boundary equations, a nonlinear optimal control problem with constraints by setting an objective function, and initial and boundary conditions is formulated. Then, a vibration suppression control problem for a free-fixed string is considered as a physical example. As a result, it turns out that vibration of the string is suppressed and the whole of the system is stabilized by the proposed method.

关键词： Distributed Parameter Mechanical Systems Discrete Mechanics Free boundary Condition Nonlinear Optimization sequential quadratic programming Stabilization Control Free-Fixed String

来源：评论

学校读者我要写书评

暂无评论

Modeling and simulation of minimum time-handling inverse dynamics of a vehicle

引用

ADVANCES IN MECHANICAL ENGINEERING 2018年第7期10卷

作者： Zhang, Li-Xia Pan, Fu-Quan Zhang, Hui Feng, Ting Qingdao Univ Technol Sch Automobile & Transportat Qingdao 266520 Peoples R China

The performance of a vehicle in minimum time handling is highly important for the safety of the vehicle. In this study, a vehicle motion state equation with 3 degrees of freedom was established on the basis of the lateral, yaw, and longitudinal motions of the vehicle. Equations on the linear tire and motion trajectory were established with consideration of longitudinal load transfer to establish the vehicle-handling dynamics model. Steering-wheel angle, driving force equation set, and yaw angle equation had been introduced to convert the vehicle-handling dynamics model into the vehicle-handling inverse dynamics model. By introducing performance index, control set, and several constraint conditions, an optimal control model of the vehicle minimum time handling was established, which was solved by improved direct multiple-shooting nonlinear programming method. A comparison of the simulation results of ADAMS/Car and MATLAB showed that both of the optimal routes input were in tangent with the road boundary. We can observe through the longitudinal velocity that the MATLAB simulation results are more similar to a straight line than that of the ADAMS/Car simulation results, which meet the psychological expectation of a driver. Thus, the inverse dynamics model on minimum time handling of the vehicle is reasonable and feasible.

关键词： Vehicle minimum time handling inverse dynamics sequential quadratic programming optimal control

来源：评论

学校读者我要写书评

暂无评论

Design of Morlet wavelet neural network to solve the non-linear influenza disease system

引用

APPLIED MATHEMATICS AND NONLINEAR SCIENCES 2022年第1期8卷 2033-2048页

作者： Sabir, Zulqurnain Umar, Muhammad Raja, Muhammad Asif Zahoor Fathurrochman, Irwan Hasan, Hafnida Hazara Univ Dept Math & Stat Mansehra Pakistan Natl Yunlin Univ Sci & Technol Future Technol Res Ctr 123 Univ RdSect 3 Touliu 64002 Yunlin Taiwan Inst Agama Islam Negeri Curup Dept Islamic Educ Management Rejang Lebong Indonesia Appl Sci Univ Fac Adm Sci Dept Accounting & Finance Al Eker Bahrain

In this study, the solution of the non-linear influenza disease system (NIDS) is presented using the Morlet wavelet neural networks (MWNNs) together with the optimisation procedures of the hybrid process of global/local search approaches. The genetic algorithm (GA) and sequential quadratic programming (SQP), that is, GA-SQP, are executed as the global and local search techniques. The mathematical form of the NIDS depends upon four groups: susceptible S(y), infected I(y), recovered R(y) and cross-immune individuals C(y). To solve the NIDS, an error function is designed using NIDS and its leading initial conditions (ICs). This error function is optimised with a combination of MWNNs and GA-SQP to solve for all the groups of NIDS. The comparison of the obtained solutions and Runge-Kutta results is presented to authenticate the correctness of the designed MWNNs along with the GA-SQP for solving NIDS. Moreover, the statistical operators using different measures are presented to check the reliability and constancy of the MWNNs along with the GA-SQP to solve the NIDS.

关键词： Non-linear influenza disease system Morlet wavelet neural networks sequential quadratic programming Runge-Kutta genetic algorithms numerical measures

来源：评论

学校读者我要写书评

暂无评论

A Gait Generation Method for the Compass-type Biped Robot on Slopes via Discrete Mechanics

A Gait Generation Method for the Compass-type Biped Robot on...

引用

IEEE Conference on Decision and Control

作者： Tatsuya Kai Takeshi Shintani Faculty of Information Science and Electrical Engineering Kyushu University JAPAN Kyocera Corporation JAPAN

ISBN: (纸本)9781612848006

In this paper, we develop a discrete mechanics approach to gait generation on slopes for the compass-type biped robot. We formulate a optimal gait generation problem for the discrete compass-type robot and show a solving method of it by the sequential quadratic programming to calculate a discrete control input. Then, we propose a transformation method from a discrete control input into a continuous zero-order hold input based on discrete Lagrange-d'Alembert principle. As a result of numerical simulations, it is confirmed that stable gaits on both downward and upward slopes can be generated for the continuous compass-type robot by the proposed method.

关键词： biped robot control input Gait Locomotion discrete element sequential quadratic programming Robot mechanic Mechanics

来源：评论

学校读者我要写书评

暂无评论

Identification of linear systems using output measurements with only two possible values

Identification of linear systems using output measurements w...

引用

IEEE Conference on Decision and Control

作者： Bruno Depraetere Gregory Pinte Jan Swevers PMA Faculty of Mechanical Engineering Katholieke Universiteit Leuven Celestijnenlaan 300 B B-3001 Leuven Belgium Flanders Mechatronics Technology Centre (FMTC) Celestijnenlaan 300 D B-3001 Leuven Belgium

ISBN: (纸本)9781612848006

Classical identification cannot be applied when no output measurements are available. In many situations however, discrete information on the unmeasured outputs can still be obtained and used to identify the underlying dynamics. An example is a moving object where an optical sensor can detect whether or not is in the sensors line of sight but whose position is not measured. Using these discrete data sources to estimate a model for the underlying dynamics is equivalent to the estimation of the linear parameters of a Wiener system, which has a known but non-invertible static non-linearity with two output levels. Techniques are derived to perform this estimation, using sequential quadratic programming to minimize a least squares goal function. Simulations are used to validate the proposed approach, yielding good convergence of the linear model parameters to their targets and a high prediction accuracy for the unmeasured variable of the Wiener system.

关键词： identification wiener model gauss-newton least squares sequential quadratic programming discrete sensor data linear model estimation

来源：评论

学校读者我要写书评

暂无评论

Optimal Orbital Plane Change by the Heating-Rate-Constrained Aerocruise

Optimal Orbital Plane Change by the Heating-Rate-Constrained...

引用

第三十八届中国控制会议

作者： Jun Fu Beijing Institute of Tracking and Telecommunication Technology

There are mainly two types of synergetic maneuvers for aeroassisted orbital transfer, which are called aeroglide and aerocruise. Aerocruise mode is considered as means for maximizing the plane change of a circular orbit by considering heating rate when the vehicle maneuvers from high Earth orbit to low Earth orbit. For aerocruise, the maneuver is divided into three phases: descent, cruise, and ascent. In cruise mode the vehicle flies at a constant altitude when thrust is used to cancel the drag and the heating rate is effectively restrained. The heating-rate-constrained aerocruise scheme which consists of cruise altitude, cruise velocity and angle of attack are optimized by using sequential quadratic programming(SQP). The effectivity of the algorithm and existence of the optimal solution are both validated by simulation experiments. Numerical results show that the orbital change ability is closely related to the maximum allowable heating rate. The maximum plane change is obtained when the vehicle remains on the heating-rate boundary. The optimality of the aerocruise maneuver is guaranteed by considering the optimized aerocruise scheme as performance index of descent trajectory optimization.

关键词： Orbital change aerocruise sequential quadratic programming trajectory optimization aeroassisted orbital transfer

来源：评论

学校读者我要写书评

暂无评论

Research on Sliding Mode Active Disturbance Rejection Control and Thrust Allocation of Dynamic Positioning System

Research on Sliding Mode Active Disturbance Rejection Contro...

引用

2019中国智能自动化大会(CIAC 2019)

作者： Zaiji Piao Chen Guo School of Marine Electrical Engineering Dalian Maritime University

In order to further improve the control ability of dynamic positioning ship or platform under complex sea conditions,the controller and thrust allocation system of dynamic positioning are designed.A simplified three-degree-of-freedom MMG mathematical model is established for the pod full-rotation propeller used in most dynamic positioning *** the basis of retaining the advantages of active disturbance rejection control,the sliding mode variable structure control method is adopted to design the control *** objective function and constraints of thrust allocation are designed based on the lowest energy consumption,and the sequential quadratic programming algorithm is used to calculate the real-time thrust allocation of each *** simulation results of the ship dynamic positioning system in MATLAB show that the controller can maintain the stability and robustness of the system under the condition of external environment disturbance,and the results of the thrust allocation are reasonable,which has a certain reference value for the further study of the ship dynamic positioning control system.

关键词： Sliding mode control Dynamic positioning system Thrust allocation sequential quadratic programming

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：