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Research on the Bias Control of Electrohydraulic Vibrator Based on 2D Valve

Author: DingZuoZuo
Tutor: RuanJian
School: Zhejiang University of Technology
Course: Mechanical and Electronic Engineering
Keywords: Bias control Offset Electro-hydraulic exciter 2D valve
CLC: TH137.5
Type: Master's thesis
Year: 2010
Downloads: 21
Quote: 0
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Abstract


Shaking table is a typical vibration conditions or simulation reproduces the environment to the standard test equipment for testing and evaluation of mechanical properties of various engineering plant , the development impact of its performance advantages and disadvantages of various industrial sectors significant high-frequency and vibration overload has been Taiwan development main content. The 2D valve controlled cylinder electro-hydraulic vibration exciter by 2D valve to control the oil out of the hydraulic cylinder to drive the piston back and forth movement , 2D valve rotary valve structures , achieved through the the 2D valve spool speed and spool axial sliding excitation frequency and independent control of amplitude . Partial set out to achieve a servo valve controlled cylinder electro-hydraulic exciter bias independent control proposed in parallel with the hydraulic cylinder to achieve load load control , this article focuses on 2D valve controlled cylinder electro-hydraulic exciter The bias control study . The main work and results of this paper are as follows : 1. Loaded the 2D valve controlled cylinder electro-hydraulic vibration exciter load partial set out to achieve control program of a three -way servo valve in parallel on the exciter . 2 the 2D valve controlled cylinder electro-hydraulic exciter mathematical models of hydraulic power , through simulation and analytic two ways to study the coupling between the electro-hydraulic exciter frequency , amplitude , bias , analysis of the frequency and partial set valve on the bias of the amplitude , frequency and 2D valve . Established experimental system for experimental study , actual output piston displacement waveform discuss the frequency, amplitude , bias control , analysis of the experimental results with the theory . The study results show that : the the the 2D valve controlled cylinder electro-hydraulic exciter frequency , amplitude and offset can be achieved independent decoupling control . Before traffic saturation , the bias amount and a bias valve opening substantially linear relationship is increased , the rising slope of the opening at about 50% plummeted . In the lower frequency , the frequency of significant impact on the bias , the the bias greater the higher the frequency ; saturation phenomenon no longer exists as the frequency increases , the frequency bias affect small . When the bias valve opening is fixed , the offset amount with the 2D valve opening increases. Through this research on the bias for precise control, decoupling control of the excitation frequency , amplitude , offset three independent future also improve hydraulic power damping ratio, to eliminate resonant , non - sinusoidal excitation waveform , more high-frequency electro-hydraulic excitation direction .

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CLC: > Industrial Technology > Machinery and Instrument Industry > Mechanical parts and gear > Hydraulic transmission > Hydraulic components
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