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This paper deal with an identification of a single rod hydraulic cylinder system and its motion control. Modeling and control of the electro-hydraulic servo system are difficult because system contains nonlinear elements. Therefore, this paper use the signal compression method to obtain the dynamic characteristic and apply the sliding mode control with sliding perturbation observer(SMCSPO) for robust...
In most servo motor drive applications, speed control is affected not only by disturbance torque but also by mechanical parameters such as inertia and friction coefficient. This paper presents a new technique for the inertia and friction identification which are based on adaptive identification. The strategy has been simulated and implemented in a drive system. The results demonstrate the high performance...
Variable structure control (VSC) theory is applied to analyze and design AC servo system for field-oriented permanent-magnet synchronous motor, which is based on Luenberger load observer. Some results of simulation experiments suggest that the AC servo system based on VSC has speedy response, high accuracy and strong robustness against its parameter variations and load disturbances. Its performance...
This paper proposes the design and implementation of model following sliding mode control strategy based on an inertial delay observer. This observer estimates the states as well as the uncertainties and disturbances in an integrated manner. It is shown that when modeling uncertainties and disturbances are present in the system, it gives better results compared with classical proportional observer...
In this paper, in order to deal with the synchro motion of four cylinders in pattern drawing machine, an electro-hydraulic synchro servo system(EHSS) with four cylinders is developed and its nonlinear dynamic model is presented. Based on the theory of taylor expansion, optimal control and nonlinear disturbamce observer designing, a nonlinear PID synchro controller for EHSS with four cylinders is proposed...
Low speed control is indispensable to several servo applications. Generally, motor speed obtained from the so-called M method is averaged by counting the number of pulses from the coupled encoder at a fixed time period. As a result, for speeds lower than the minimum measurable value determined by the sampling frequency and the resolution of the encoder, a long detection delay time may degrade the...
A new scheme to estimate the moment of inertia in the motor drive system in very low speed is proposed. The simple speed estimation scheme, which is used in most servo systems for low-speed operation, is sensitivity to variations in machine parameters especially the moment of inertia. To estimate the motor inertia value, an extended Luenberger observer (ELO) is applied. The observer gain matrix can...
A sliding-mode variable structure control algorithm with integral compensation was presented for the electromechanical servo tracking system. It contains the disturbance and the plant parameter variation. To obtain the optimal sliding mode, the switching function is determined by reaching condition. The integral gain and control function are obtained by quadratic optimization. An asymptotic state...
This paper presents a method of linear robust observer design for electro-hydraulic valve-controlled single rod cylinder servo system fault detection. Firstly, the paper outlines the difficulties associated with modeling nonlinear observer and the dynamic equations of the system. Secondly, the linear modeling process is recapped by highlighting the likely uncertainties which influence the implementation...
This paper deals with the ram-air servo system, a control methodology based on the model-based control of pulse is present, which can linearize the nonlinear servo system. Pneumatic actuators exhibit highly nonlinear characteristics due to the compressibility of air, the complicity of friction and the nonlinearity of valves. To solve these problems, an integral sliding mode variable structure control...
A scheme of a model reference adaptive system (MRAS) based on the theory of parameter optimization for the PMSM servo system is described in this paper. The scheme can promptly work out the speed of the rotor without any other position/speed sensor. Different from the other MRAS-based speed observers which constructed according the theory of stability customarily, by using the error between the measured...
Two new methods to improve the ultra-low speed control performance of ac servo system are described in this paper. One is improved M/T method, which could minimize the influence of speed detection dead time and smooth the measurement. Another is instantaneous speed detection based on constant jerk model, which assumes the rotor jerk is constant at the interval of sampling period. The instantaneous...
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