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Research on Vibration Control of Single-Axis Electrohydraulic Angular Vibration Table

Author: GuanJinKai
Tutor: ZhaoKeDing；YuanLiPeng
School: Harbin Institute of Technology
Course: Mechanical and Electronic Engineering
Keywords: angular vibration table there variable controller frequency response function estimated random vibration replication iteration algorithm
CLC: TP273
Type: Master's thesis
Year: 2009
Downloads: 40
Quote: 0
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Abstract


Vibration table is a kind of standard experiment equipment which is used to replicate the real vibrate environment. Among them, electro- hydraulic servo vibration table is a special kind of vibration environment simulated equipment which is widely used in national defense industry, such as missiles, rockets and satellites. To replicate real vibrate environment more accurately, not only is it necessary to study sine vibration control technology , but also is it a key for vibration control technology to study random vibration control’s application in industrial fields.Random vibration control system demands that the vibration system has high frequency response. But power mechanism of electro-hydraulic servo angular vibration table is motor controlled by the valves, the frequency response of which is lower. The study of the servo method that can heighten the system frequency response is a key technology to random angular vibration control. The mathematical model of motor controlled by the valves is set up. There variable control is a effective method to improve the system frequency response. In the paper, the author analyses the principle of there variable controller. According the principle, the author design the there variable controller for electro-hydraulic servo angular vibration table. The applicability of the new control method is indicated by the simulation.In the random vibration control, random vibration iteration precision is lower than expected only by servo control technology. The main reasons consist of the system’s nonlinear and the restraint of the system frequency response. It is necessary to present random vibration replication control algorithm, to improve the control precision. The paper analyses mainly waveform replication iteration algorithm and PSD replication iteration algorithm. Frequency response function estimated is the foundation of random vibration control and its results estimated is directly related to vibration control accuracy. The paper presents the traditional frequency response function estimating method and analysis defects of this method. The paper introduces the principle of adaptive filtering, adaptive filter structure and the realization of the type of adaptive algorithm, then presents a new frequency response function estimating method based on the principle of adaptive algorithm. The method has the features of adaptive filters. The frequency response function estimated can be adjusted according to the changes of vibration table system, without the effect of the changes of noise’s statistical properties. The paper also analysis other key parts of random vibration replication iteration algorithm, including estimating of response spectrum, correction of driver spectrum iteration, generation of time-domain driver signal. The paper makes improvements to correction of driver spectrum iteration, with different correct modulus in different frequency band. The vibration replication iteration control theory is indicated by the simulation in Matlab.The paper analysis electro-hydraulic servo angular vibration test’s results, and indicates the above conclusion. Angle vibration test consists of frequency response function estimating test, waveform replication iteration vibration test and PSD replication iteration vibration test.

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation systems > Automatic control,automatic control system
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