A Dynamic Model of the Flapper-Nozzle Component of an Electrohydraulic Servovalve

1989 ◽  
Vol 111 (1) ◽  
pp. 105-109 ◽  
Author(s):  
S. J. Lin ◽  
A. Akers
Keyword(s):  
Dynamic System ◽  
Frequency Response ◽  
Dynamic Model ◽  
Dynamic Properties ◽  
Response Characteristics ◽  
Equilibrium Control ◽  
Flow Pressure ◽  
Frequency Response Characteristics ◽  
Design Characteristics ◽  
Full Design

An analysis has been conducted on the flapper-nozzle stage of a two-stage electrohydraulic controller that has been specifically designed to be a stable, stand-alone dynamic system. Calculations performed on equilibrium control pressures, stage gain, and frequency response characteristics agree with values obtained experimentally to within close limits. The analysis applies generally to a flapper-nozzle combination using any set of dimensions convenient for the designer. Flow-pressure equations and flapper dynamic properties have also been given to enable the designer to obtain full design characteristics.

scholarly journals Study on a Class of Piecewise Nonlinear Systems with Fractional Delay

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Meiqi Wang ◽  
Wenli Ma ◽  
Enli Chen ◽  
Yujian Chang
Keyword(s):  
Time Delay ◽  
Nonlinear System ◽  
Frequency Response ◽  
Dynamic Model ◽  
Fractional Order ◽  
Excitation Frequency ◽  
Order Parameters ◽  
Response Characteristics ◽  
Amplitude Frequency Response ◽  
Frequency Response Characteristics

In this paper, a dynamic model of piecewise nonlinear system with fractional-order time delay is simplified. The amplitude frequency response equation of the dynamic model of piecewise nonlinear system with fractional-order time delay under periodic excitation is obtained by using the average method. It is found that the amplitude of the system changes when the external excitation frequency changes. At the same time, the amplitude frequency response characteristics of the system under different time delay parameters, different fractional-order parameters, and coefficient are studied. By analyzing the amplitude frequency response characteristics, the influence of time delay and fractional-order parameters on the stability of the system is analyzed in this paper, and the bifurcation equations of the system are studied by using the theory of continuity. The transition sets under different piecewise states and the constrained bifurcation behaviors under the corresponding unfolding parameters are obtained. The variation of the bifurcation topology of the system with the change of system parameters is given.

Analysis of frequency response characteristics of polymer ultrasonic transducers

1992 ◽  
Vol 25 (3) ◽  
pp. 155
Author(s):  
H. Ohigashi ◽  
T. Itoh ◽  
K. Kimura ◽  
T. Nakanishi ◽  
M. Suzuki
Keyword(s):  
Frequency Response ◽  
Ultrasonic Transducers ◽  
Response Characteristics ◽  
Frequency Response Characteristics
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