Modal space three-state feedback and feedforward control for 2-DOF electro-hydraulic servo shaking table with dynamic coupling caused by eccentric load

Mechatronics ◽  
2021 ◽  
Vol 79 ◽  
pp. 102661
Author(s):  
Jinsong Zhao ◽  
Xinyu Sun ◽  
Jiaxiang Xu ◽  
Jie Dong ◽  
Wuxu Li ◽  
...  
Keyword(s):  
State Feedback ◽  
Feedforward Control ◽  
Shaking Table ◽  
Dynamic Coupling ◽  
Eccentric Load ◽  
Hydraulic Servo ◽  
Modal Space

Modal space three-state feedback control for electro-hydraulic servo plane redundant driving mechanism with eccentric load decoupling

2018 ◽  
Vol 77 ◽  
pp. 201-221 ◽  
Author(s):  
Jinsong Zhao ◽  
Zhipeng Wang ◽  
Chuanbi Zhang ◽  
Chifu Yang ◽  
Wenjie Bai ◽  
...  
Keyword(s):  
Feedback Control ◽  
State Feedback ◽  
State Feedback Control ◽  
Driving Mechanism ◽  
Eccentric Load ◽  
Hydraulic Servo ◽  
Modal Space

scholarly journals Decoupling Control of a Multiaxis Hydraulic Servo Shaking Table Based on Dynamic Model

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Qitao Huang ◽  
Peng Wang ◽  
Yuhao Wang ◽  
Qinjun Yang
Keyword(s):  
Dynamic Model ◽  
Strong Coupling ◽  
Control Strategy ◽  
Physical Space ◽  
Decoupling Control ◽  
Shaking Table ◽  
Control Performance ◽  
Single Input Single Output ◽  
Hydraulic Servo ◽  
Modal Space

Hydraulic servo shaking table is an essential testing facility to simulate the actual vibration situation in real time. As a parallel mechanism, multiaxis hydraulic servo shaking table shows strong coupling characteristic among different degrees of freedom. When the multiaxis hydraulic shaking table moves to one direction, some unnecessary related motions will appear in other directions, which seriously affect the control performance. An effective approach to decouple motions in command direction and in unnecessary related directions is an urgent need for a higher precision control performance. In this work, the coupling phenomena and reasons of the multiaxis hydraulic servo table are analyzed based on dynamic model of a multiaxis hydraulic servo shaking table. In this regard, multiaxis hydraulic servo shaking table with strong coupling within the physical space is transformed into a set of single-input single-output systems that are independent of each other in the modal space. A decoupling control strategy is proposed in modal space to restrain the coupling motions. Simulation and experimental results show that the proposed control strategy can effectively improve the control performance and the decoupling effect.

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.

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