scholarly journals Discussion: “Response Characteristics of a Pulse-Width-Modulated Electrohydraulic Servo” (Tsai, S. C., and Ukrainetz, P. R., 1970, ASME J. Basic Eng., 92, pp. 204–214)

1970 ◽  
Vol 92 (2) ◽  
pp. 214-214 ◽  
Author(s):  
D. E. Boddy
Keyword(s):  
Pulse Width ◽  
Pulse Width Modulated ◽  
Response Characteristics

Response Characteristics of a Pulse-Width-Modulated Electrohydraulic Servo

1970 ◽  
Vol 92 (2) ◽  
pp. 204-214 ◽  
Author(s):  
S. C. Tsai ◽  
P. R. Ukrainetz
Keyword(s):  
Pulse Width ◽  
Closed Loop ◽  
Mechanical Load ◽  
Transfer Characteristic ◽  
Double Fourier Series ◽  
Hydraulic Control ◽  
Pulse Width Modulated ◽  
Response Characteristics ◽  
Theoretical Analyses

Methods for analyzing the response characteristics of a pulse-width-modulated electro-hydraulic servomechanism are presented. Except for the modulator, the hydraulic control system is of conventional configuration. The modulator transfer characteristic is derived from a double Fourier series analysis of the pulse-width-modulated signal and this indicates the effect of the modulation parameters on the system performance. The valve flow which controls the mechanical load motion has been shown to be the dominant nonlinearity in a valve-controlled hydraulic system, and the system becomes more complicated due to the valve spool dither which is a consequence of the pulse-width-modulated signal. A dual-input describing function is developed for the equivalent valve flow gain in the determination of the system closed-loop frequency response. A numerical simulation is used to obtain the closed-loop transient response. Experimental verification of the theoretical analyses is carried out on a practical system. Good agreement is obtained between the predicted and the experimental responses.

Pulse-Width Modulated Amplifier for DC Servo System and Its Matlab Simulation

2015 ◽  
Vol 9 (1) ◽  
pp. 625-631
Author(s):  
Ma Xiaocheng ◽  
Zhang Haotian ◽  
Cheng Yiqing ◽  
Zhu Lina ◽  
Wu Dan
Keyword(s):  
Mathematical Model ◽  
Transfer Function ◽  
Input Signal ◽  
Pulse Width ◽  
Rotation Speed ◽  
Servo Motor ◽  
Matlab Simulation ◽  
Pulse Width Modulated ◽  
Signal Changes ◽  
The Relationship

This paper introduces a mathematical model for Pulse-Width Modulated Amplifier for DC Servo Motor. The relationship between pulse-width modulated (PWM) signal and reference rotation speed is specified, and a general model of motor represented by transfer function is also put forward. When the input signal changes, the rotation speed of the servo motor will change accordingly. By changing zeros and poles, transient performance of this system is discussed in detail, and optimal ranges of the parameters is recommended at the end of discussion.

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