Shake table acceleration tracking performance impact on dynamic similitude

2021 ◽  
Author(s):  
Miguel Angelo Cadete Andrade Mota
Keyword(s):  
Tracking Performance ◽  
Shake Table ◽  
Performance Impact ◽  
Dynamic Similitude ◽  
Acceleration Tracking

Acceleration Tracking Performance of the UCSD-NEES Shake Table

2010 ◽  
Vol 136 (5) ◽  
pp. 481-490 ◽  
Author(s):  
J. E. Luco ◽  
O. Ozcelik ◽  
J. P. Conte
Keyword(s):  
Tracking Performance ◽  
Shake Table ◽  
Acceleration Tracking

Acceleration decoupling control of 6 degrees of freedom electro-hydraulic shaking table

2019 ◽  
Vol 25 (21-22) ◽  
pp. 2758-2768 ◽  
Author(s):  
Guang-feng Guan ◽  
AR Plummer
Keyword(s):  
Degrees Of Freedom ◽  
Inverse Dynamics ◽  
Joint Space ◽  
Decoupling Control ◽  
Shaking Table ◽  
Tracking Performance ◽  
Actuator Dynamics ◽  
Stability Margins ◽  
Seismic Testing ◽  
Acceleration Tracking

Electro-hydraulic shaking tables are widely used for vibration testing where high force and displacement amplitudes are required. In particular, they are a vital tool in seismic testing, enabling the development of buildings and other structures which are earthquake resistant. Three-variable-control (TVC) is commonly used for the control of multi-degrees of freedom (DOFs) electro-hydraulic shaking tables. However, the coupling between the DOFs is often significant and is not compensated by TVC. In this paper, an acceleration decoupling control (ADC) method is presented for a 6 DOFs electro-hydraulic shaking table system to improve the acceleration tracking performance and decouple the motion in task space. The gravitational, Coriolis, and centripetal forces are compensated for in joint space based on a dynamic model of the shaking table. Modal control is used to transform the coupled dynamics into six independent systems. Inverse dynamics models are used to cancel the differences in actuator dynamics. The proportional gains in modal space are tuned heuristically to give sufficient stability margins to provide robustness in the presence of modeling errors. The input filter and feedforward controller in TVC are added to improve the acceleration tracking performance of each independent system. Experimental acceleration frequency responses are used to demonstrate the effectiveness of ADC, and in particular these show a consistent reduction in cross-axis coupling compared to TVC. Moreover, only four parameters need to be tuned, as opposed to 36 for TVC, and the method provides a viable route to improving the accuracy of seismic testing in the future.

scholarly journals Modelling, design and analysis of three controllers based on LQR formulation for a non-linear hydraulic uniaxial seismic shake table

2019 ◽  
Vol 95 ◽  
pp. 03004
Author(s):  
José Luis Sarmiento ◽  
Carlos Borrás Pinilla
Keyword(s):  
Control Systems ◽  
Linear Model ◽  
Shake Table ◽  
Hydraulic Actuator ◽  
Linear Quadratic ◽  
Non Linear ◽  
Linear Quadratic Tracking ◽  
Quadratic Integral ◽  
Quadratic Tracking ◽  
Acceleration Tracking

This study presents the modelling, design and analysis of three controllers applied to the non-linear model of a hydraulic uniaxial seismic shake table. Firstly, the system’s non-linear model is constructed based on the dynamic and mathematical analysis of the hydraulic actuator and the servo valve. Then, three control systems based on the LQR formulation are designed for the acceleration tracking: Linear quadratic integral (LQI), linear quadratic tracking (LQT) and a variation of LQT. Lastly, simulations are carried out using the non-linear model as the plant and the results showed that the variation of the LQT control exhibited the best acceleration tracking performance.

Multiple-Object Tracking

2011 ◽  
Vol 58 (3) ◽  
pp. 196-200 ◽  
Author(s):  
K. Botterill ◽  
R. Allen ◽  
P. McGeorge
Keyword(s):  
Object Tracking ◽  
Cognitive Processes ◽  
Spatial Location ◽  
Multiple Object Tracking ◽  
Tracking Performance ◽  
Multiple Object

The Multiple-Object Tracking paradigm has most commonly been utilized to investigate how subsets of targets can be tracked from among a set of identical objects. Recently, this research has been extended to examine the function of featural information when tracking is of objects that can be individuated. We report on a study whose findings suggest that, while participants can only hold featural information for roughly two targets this task does not affect tracking performance detrimentally and points to a discontinuity between the cognitive processes that subserve spatial location and featural information.

Tracking performance as measured by time continuously on target.

1954 ◽  
Author(s):  
E. J. Archer ◽  
L. B. Wyckoff ◽  
F. G. Brown
Keyword(s):  
Tracking Performance
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