Acceleration Harmonic Cancellation of Electro-hydraulic Servo Shaking Table

2010 ◽  
Vol 46 (03) ◽  
pp. 22 ◽  
Author(s):  
Jianjun YAO
Keyword(s):  
Shaking Table ◽  
Hydraulic Servo ◽  
Harmonic Cancellation

Delay compensation position tracking control of electro-hydraulic servo systems based on a delay observer

2019 ◽  
Vol 234 (5) ◽  
pp. 622-633
Author(s):  
Xingya Ding ◽  
Gang Shen ◽  
Xiang Li ◽  
Yu Tang
Keyword(s):  
Position Control ◽  
Signal Transmission ◽  
Experimental Results ◽  
Shaking Table ◽  
Feedback Signal ◽  
Delay Compensation ◽  
Servo Systems ◽  
Hybrid Controller ◽  
Hydraulic Servo ◽  
Backstepping Controller

In this article, the position control problem of electro-hydraulic servo systems with feedback signal transmission delay is studied. In order to improve the control accuracy of the system, a hybrid controller which combines a delay observer, a nonlinear disturbance observer and a backstepping controller is proposed. The controller has the characteristics of compensating the delay of signal transmission, restraining the uncertain disturbance of control systems and high control precision. In order to verify the stability and validity of the proposed hybrid controller, a single-degree-of-freedom electro-hydraulic shaking table is used to verify the experimental results. The experimental results show that the proposed controller has better control effects than proportional integral derivative and backstepping controller.

The resonant valley suppression of a hydraulic shaking table by using adaptive spectral line enhancer

2018 ◽  
Vol 232 (10) ◽  
pp. 1379-1388
Author(s):  
Tao Wang ◽  
Jinchun Song
Keyword(s):  
Spectral Line ◽  
Coupling Effect ◽  
Resonance Effect ◽  
Shaking Table ◽  
Resonance Phenomenon ◽  
Resonant System ◽  
Stability Range ◽  
Elastic Load ◽  
Hydraulic Servo ◽  
The Stability

As an electro-hydraulic servo shaking table takes on an elastic load in a vibration test of a 2-mass dynamic system, a mutual coupling effect is exerted between the shaking table and the specimen, which will form a resonant system to weaken the dynamic characteristics of the system. As required by the system bandwidth, the resonant system contains a resonance valley and a resonance peak, and its amplitude commonly surmounts the stability range of the system’s acceleration amplitude. In this article, the resonance phenomenon is analyzed, and the structure and the parameters of the three-state controller are designed on the basis of a pole assignment system. The adaptive spectral line enhancer is adopted to suppress the resonant valley, and the power spectrum is analyzed to experimentally verify that it exerts an anti-resonance effect.

Research on Design Method of Combined Steel Lead Energy Dissipation Structure

2011 ◽  
Vol 71-78 ◽  
pp. 526-530
Author(s):  
Xue Yuan Yan ◽  
Ai Qi ◽  
Wei Lin ◽  
Su Guo Wang
Keyword(s):  
Energy Dissipation ◽  
Design Method ◽  
Design Procedure ◽  
Hysteresis Loops ◽  
Shaking Table ◽  
Static Tests ◽  
Dissipation Structure ◽  
Hydraulic Servo ◽  
Control Principle ◽  
And Control

Construction and control principle of the new combined steel lead damper (NCSLD) were introduced, pseudo-static tests of NCSLD which would be used in the subsequent shaking table tests were carried out for the study of its mechanical properties using electro-hydraulic servo press-shear machine. Structural seismic design procedure using NCSLD is presented. An engineering example of seismic strengthening using NCSLD is provided. Results of tests and analyses indicate that NCSLD has full hysteresis loops which take on bilinearity; NCSLD is of strong energy dissipation ability and has obvious control effects for structural inter-story displacement and acceleration reactions.

scholarly journals Acceleration Harmonics Identification for an Electro-Hydraulic Servo Shaking Table based on a Nonlinear Adaptive Algorithm

2018 ◽  
Author(s):  
Jianjun Yao ◽  
Chenguang Xiao ◽  
Zhenshuai Wan ◽  
Shiqi Zhang ◽  
Xiaodong Zhang
Keyword(s):  
Dead Zone ◽  
Harmonic Distortion ◽  
Harmonic Component ◽  
Weight Vector ◽  
Shaking Table ◽  
Acceleration Response ◽  
Good Convergence ◽  
Acceleration Signal ◽  
True Value ◽  
Hydraulic Servo

Since the electro-hydraulic servo shaking table exists many nonlinear elements, such as, dead zone, friction and blacklash, its acceleration response has higher harmonics which result in acceleration harmonic distortion, when the electro-hydraulic system is excited by sinusoidal signal. For suppressing the harmonic distortion and precisely identify harmonics, a combination of the adaptive linear neural network and least mean M-estimate (ADALINE-LMM), is proposed to identify the amplitude and phase of each harmonic component. Namely, the Hampel’s three-part M-estimator is applied to provide thresholds for detecting and suppressing the error signal. Harmonic generators are used by this harmonic identification scheme to create input vectors and the value of the identified acceleration signal is subtracted from the true value of the system acceleration response to construct the criterion function. The weight vector of the ADALINE is updated iteratively by the LMM algorithm, and the amplitude and phase of each harmonic, even the results of harmonic components, can be computed directly online. The simulation and experiment are performed to validate the performance of the proposed algorithm. According to the experiment result, the above method of harmonic identification possesses great real-time performance and it has not only good convergence performance but also high identification precision.

scholarly journals Acceleration Harmonic Estimation for Hydraulic Servo Shaking Table Based on Multi-Innovation Stochastic Gradient Algorithm

2020 ◽  
Vol 2020 ◽  
pp. 1-13 ◽  
Author(s):  
Xiancheng Wang ◽  
Wei Li ◽  
Jianjun Yao ◽  
Zhenshuai Wan
Keyword(s):  
Harmonic Distortion ◽  
Stochastic Gradient ◽  
Shaking Table ◽  
Gradient Algorithm ◽  
Phase Lag ◽  
Good Convergence ◽  
Acceleration Signal ◽  
Stochastic Gradient Algorithm ◽  
Hydraulic Servo ◽  
Convergence Performance

As one of the critical test equipment, hydraulic servo shaking table is widely used in shaking environment simulation of structural components and systems. However, inherent nonlinear factors of a hydraulic servo shaking table can cause amplitude attenuation and phase lag when corresponding to a sinusoidal acceleration signal, which leads to serious harmonic distortion. In order to improve waveform reproduction performance of sinusoidal signals, the amplitude and phase of harmonic should be estimated accurately. In this paper, the multi-innovation stochastic gradient (MISG) algorithm is presented for dynamically estimating the harmonic information. Simulation and experiment results demonstrate that the proposed algorithm has high estimation precision and good convergence performance.

Sinusoidal acceleration harmonic estimation using the extended Kalman filter for an electro-hydraulic servo shaking table

2013 ◽  
Vol 21 (8) ◽  
pp. 1566-1579 ◽  
Author(s):  
Jianjun Yao ◽  
Han Yan ◽  
Rui Xiao ◽  
Duotao Di ◽  
Guilin Jiang ◽  
...  
Keyword(s):  
Kalman Filter ◽  
Extended Kalman Filter ◽  
Shaking Table ◽  
Hydraulic Servo
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