检索结果-南通市图书馆

Proportional-derivative Control of Second-order Tethered Satellites System Based on Extended State Observer and feed-forward compensation

引用

Guidance, Navigation and Control 2023年第3期3卷 65-88页

作者： Bowen Su Fan Zhang Panfeng Huang Research Center for Intelligent Robotics School of Astronautics Northwestern Polytechnical University Xi'an P.R.China National Key Laboratory of Aerospace Flight Dynamics Northwestern Polytechnical University Xi'an P.R.China

This paper researches the proportional-derivative(PD)feedback control with feed-forward compensations from input for a triangular tethered satellite system(TTSS),and the extended state observer(ESO)design which is further incorporated in control to estimate the structural uncertainties in *** expanding Lagrangian equations under chosen variables,the dynamic equations of TTSS are derived which is the second-order nonlinear *** the feedback control under typical feed-forward compensations is discussed as the nonlinear functions in system are counteracted,and the controlled outputs are computed by deriving the transfer functions of the transformed ***,in case of the uncertain structures in system which may constrain the control e®ect,ESO-based PD control is further proposed,and the observed error and controlled accuracy are analyzed by Lyapunov *** results on the designed controls are presented to validate the theoretic analyses.

关键词： PD control extended state observer feed-forward compensation transfer function tethered formation

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Real-time feed-forward Force compensation for Active Magnetic Bearings System Based on H∞ Controller

引用

Chinese Journal of Mechanical Engineering 2011年第1期24卷 58-66页

作者： GAO Hui XU Longxiang College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 China

There are two kinds of unbalance vibrations—force vibration and displacement vibration due to the existence of unbalance excitation in active magnetic bearings（AMB） system. And two unbalance compensation methods—closed-loop feedback and open loop feed-forward are presented to reduce the force vibration. The transfer function order of the control system directly influencing the system stability will be increased when the closed-loop method is adopted, which makes the real-time compensation not easily achieved. While the open loop method would not increase the primary transfer function order, it provides conditions for real-time compensation. But the real-time compensation signals are not easy to be obtained in the open loop method. To implement real-time force compensation, a new method is proposed to reduce the force vibration caused by the rotor unbalance on the basis of AMB active control. The method realizes real-time and on-line force auto-compensation based on H∞ controller and one novel feed-forward compensation controller, which makes the rotor rotate around its inertia axis. The time-variable feed-forward compensatory signal is provided by a modified adaptive variable step-size least mean square（VSLMS） algorithm. And the relevant least mean square（LMS） algorithm parameters are used to solve the H∞ controller weighting functions. The simulation of the new method to compensate some frequency-variable and sinusoidal signals is completed by MATLAB programming, and real-time compensation is implemented in the actual AMB experimental system. The simulation and experiment results show that the compensation scheme can improve the robust stability and the anti-interference ability of the whole AMB system by using H∞ controller to achieve close-loop control, and then real-time force unbalance compensation is implemented. The proposed research provides a new control strategy containing real-time algorithm and H∞ controller for the force compensation of AMB system. And

关键词： active magnetic bearings H∞ robust controller sensitivity and complementary sensitivity VSLMS algorithm feed-forward compensation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A novel loss compensation technique analysis and design for 60 GHz CMOS SPDT switch

引用

Journal of Semiconductors 2016年第1期37卷 88-91页

作者：郑宗华孙玲玲刘军张胜洲 Institute of VLSI Design Zhejiang University Hangzhou 310027 China The Key Laboratory for RF Circuits and Systems of Ministry of Education Hangzhou Dianzi UniversityHangzhou 310037 China

A novel loss compensation technique for a series-shunt single-pole double-throw （SPDT） switch is pre- sented operating in the 60 GHz. The feed-forward compensation network which is composed of an NMOS, a couple capacitance and a shunt inductance can reduce the impact of the feed forward capacitance to reduce the insertion loss and improve the isolation of the SPDT switch. The measured insertion loss and isolation characteristics of the switch somewhat deviating from the 60 GHz are analyzed revealing that the inaccuracy of the MOS model can greatly degrade the performance of the switch. The switch is implemented in TSMC 90-nm CMOS process and exhibits an isolation of above 27 dB at transmitter mode, and the insertion loss of 1.8-3 dB at 30--65 GHz by layout simulation. The measured insertion loss is 2.45 dB at 52 GHz and keeps 〈 4 dB at 30-64 GHz. The measured isolation is better than 25 dB at 30--64 GHz and the measured return loss is better than 10 dB at 30-65 GHz. A measured input 1 dB gain compression point of the switch is 13 dBm at 52 GHz and 15 dBm at 60 GHz. The simulated switching speed with rise time and fall time are 720 and 520 ps, respectively. The active chip size of the proposed switch is 0.5 × 0.95 mm2.

关键词： feed-forward compensation series-shunt single-pole double-throw (SPDT) switch CMOS

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

An Effective Optimized Strategy on Speed Fluctuation Suppression for Air Conditioner Compressor

An Effective Optimized Strategy on Speed Fluctuation Suppres...

引用

第36届中国控制会议

作者： Wang Zhaodong Wen Xiaoqin You Linru Meng Fankun School of Automation Science and Engineering South China University of Technology Department of machinery and electronics engineering Jing dezhen Institute

ISBN: (纸本)9781538629185

Aiming at the problem of existing larger speed fluctuation when the variable frequency air conditioning compressor running at low frequency,the reason of speed fluctuation in the low speed range for compressor is analyzed thoroughly in this paper,a speed fluctuation suppression strategy for the air conditioning compressor is ***,the periodic speed pulsation of compressor is reduced by P-type iterative learning control（PILC）,and a forgetting factor is introduced into the PILC algorithm for weakening the error accumulation of non-periodic disturbance,then,the modified ILC algorithm is optimized for reducing the speed fluctuation suppression effect ***,a feed-forward is performed by the q-axis current compensation of PILC,which is to realize the torque compensation of compressor ***,the purpose of suppressing speed fluctuation is ***,simulations are implemented on Matlab/Simulink platform,and experimental researches are implemented on the H＆T variable frequency air conditioner compressor control *** research results indicate that the proposed strategy can effectively suppress the speed fluctuation of compressor at low frequency.

关键词： Air-conditioner compressor Iterative learning control Forgetting factor feed-forward compensation Speed fluctuation suppression

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

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：