Identification and control of Hammerstein systems with dead-zone input

2017 ◽  
Author(s):  
Linwei Li ◽  
Xuemei Ren ◽  
Yongfeng Lv
Keyword(s):  
Dead Zone ◽  
Hammerstein Systems ◽  
And Control

Identification and control for Hammerstein systems with hysteresis non-linearity

2015 ◽  
Vol 9 (13) ◽  
pp. 1935-1947 ◽  
Author(s):  
Xuehui Gao ◽  
Chengyuan Zhang ◽  
Changsheng Zhu ◽  
Xuemei Ren
Keyword(s):  
Hammerstein Systems ◽  
And Control

Modeling and Control of Proportional Valve with Synchronous Motor

2015 ◽  
Vol 220-221 ◽  
pp. 457-462 ◽  
Author(s):  
Andrzej Milecki ◽  
Dominik Rybarczyk
Keyword(s):  
Permanent Magnets ◽  
Dead Zone ◽  
Flow Characteristics ◽  
Synchronous Motor ◽  
Hydraulic Actuator ◽  
Servo Drive ◽  
Proportional Valve ◽  
Modeling And Control ◽  
Basic Characteristics ◽  
And Control

The paper describes the research results of modeling and control of proportional valve with synchronous motor type PMSM (Permanent Magnets Synchronous Motor). In the paper, a simulation model of the proposed valve was developed and described. The model included the square root flow characteristics, nonlinearity of the hydraulic actuator, valve dead zone and saturation of the flow. The study included the investigations of the basic characteristics, such as valve flow characteristic and step responses. In order to determine the basic parameters of the valve, the test stand was built, on which the new valve and the servo drive with this valve were tested. A servo drive control system was based on PLC with touch panel and inverter module. In the paper, the chosen investigations results of the valve and the servo drive system are presented and shortly discussed.

Design and Control of the 3 Axes Pneumatic Servo Micromanipulator for the Biological Technology

2009 ◽  
Author(s):  
Ming-Chang Shih ◽  
Hung-Yi Chen
Keyword(s):  
Fuzzy Controller ◽  
Dead Zone ◽  
Nonlinear Effects ◽  
Control Technique ◽  
Positioning Precision ◽  
Pneumatic Control ◽  
Biological Technology ◽  
Highly Nonlinear ◽  
A Cell ◽  
And Control

This paper describes the servo pneumatic control technique, which is applied to the biomedical and biological technology. A cell micromanipulator is built by a 3-axes servo pneumatic micromanipulator system, which is set horizontally or vertically and driven by pneumatic cylinders. Due to the nonlinear characteristic of the air flow and the compressibility of air, the system is highly nonlinear system. Therefore, the compensators must be designed to reject those nonlinear effects and to improve the positioning precision. The dead-zone of the 3 axes pneumatic servo micromanipulator is measured, and the relation of velocity and voltage is plotted. Finally, a hybrid fuzzy controller, with dead zone, and velocity compensation, is designed to control the positioning precision of the 3 axes pneumatic servo micromanipulator. From the experimental results, the pneumatic servo micromanipulator has the positioning accuracy of 40 nm with different displacements. The system can be potentially used for the cell extraction, puncture, cutting and microinjection of the biological technology.

scholarly journals Human Simulated Intelligent Control with Double-Direction Dead-Zone Compensation for Joint Motion Control of a Large-Sized Boom System

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Rongsheng Liu ◽  
Yingjie Gao ◽  
Yulin Yang ◽  
Yanlong Liu
Keyword(s):  
Motion Control ◽  
Intelligent Control ◽  
Dead Zone ◽  
Control Mode ◽  
Joint Motion ◽  
Compensation Scheme ◽  
Negative Effects ◽  
Proportional Valve ◽  
Control Scheme ◽  
And Control

Joint motion control of a 52-meter-long five-boom system driven by proportional hydraulic system is developed. It has been considered difficult due to strong nonlinearities and parametric uncertainties, the effect of which increases with the size of booms. A human simulated intelligent control scheme is developed to improve control performance by modifying control mode and control parameters. In addition, considering the negative effects caused by frequent and redundant reverse actions of the proportional valve, a double-direction compensation scheme is proposed to deal with the dead-zone nonlinearity of proportional valve. Sinusoidal motions are implemented on a real boom system. The results indicate that HSIC controller can improve control accuracy, and dead-zone nonlinearity is effectively compensated by proposed compensation scheme without introducing frequent reverse actions of proportional valve.

Sliding mode pressure controller for an electropneumatic brake: Part I—plant model and controller design

2018 ◽  
Vol 232 (5) ◽  
pp. 572-582 ◽  
Author(s):  
Zhuojun Luo ◽  
Mengling Wu ◽  
Jianyong Zuo
Keyword(s):  
Pulse Width Modulation ◽  
Control Method ◽  
Controller Design ◽  
Sliding Mode ◽  
Dead Zone ◽  
Plant Model ◽  
Knowledge Based ◽  
Discontinuous Nature ◽  
Reliable Knowledge ◽  
And Control

Instead of using knowledge-based controllers, which need a lot of experience and experimental data to form a reliable knowledge base, a model-based controller is proposed in this article based on a sliding mode control method to control the brake cylinder pressures of an electropneumatic brake on subway trains. The complicated structure of the electropneumatic brake is simplified, and an order-reduced nonlinear model of the plant is built. An equivalently continuous technique based on pulse width modulation is used to deal with the discontinuity of the plant model, which is derived from the discontinuous nature of On/Off valves. The nonlinear sliding mode controller is designed for air charging and discharging periods, respectively. Measures such as continuous approximation and control dead zone are introduced into the controller to improve control performance. This article concerns mainly about the theoretical part of the whole research. Plant parameter identification and controller tests are performed in a sequel article.

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