Effect assessment for the interaction between shaking table and eccentric load

Abstract

Electro-hydraulic shaking table is an essential experimental apparatus to evaluate structural performance under actual vibration condition. The control-structure interaction (CSI) between shaking table and eccentric load has lately received considerable attention for causing the accuracy degradation of shaking table test. At present, the research gap of the influence of the eccentricity of load on the CSI makes it challenging to find the CSI effects. And an effect assessment is yet to be proposed to evaluate the CSI effects, which has impeded the development of test technology. To overcome those theoretical bottlenecks, in this research, an analytical transfer function matrix of shaking table and eccentric load is established to analyze the CSI effects. The analysis is conducted under such conditions as different mass ratio (MR), moment of inertia ratio (IR), and eccentric distance ratio (ER) conditions. Through the analysis, the role of the ER is identified, the sensitivities of the MR, IR, and ER to the transfer function matrix are revealed, and the CSI effects are found. Furthermore, a novelty effect assessment is proposed to appraise whether the CSI effects can be ignored in shaking table test. And the visualization expression of the effect assessment is obtained for convenient application.

Experimentally investigating the influence of changing payload stiffness on outer loop iterative learning control strategies with shaking table tests

“…Approximate matching of the test and actual payload mass is important during the motion calibration (Phillips et al, 2014). However, whilst it is often acknowledged that the payload dynamics can influence the calibrated motions achieved, matching of stiffnesses between the test and actual payload is less commonly discussed (Yachun et al, 2018; Wang et al, 2022). Further, in many applications, whilst the payload mass is fixed, the payload can experience significant changes of stiffness due to the applied motion.…”

Study on the interaction between shaking table and eccentric load

“…From the aspect of load characteristics, researchers have analysed the effects of mass, damping ratio, and frequency, 3,21 rigidity and flexibility, 22 the physical realization of damping, 15 the physical realization of stiffness, 23 and vibration mode 24 on the models of shaking table and load. The above researches have been provided in reference, 25 so the detailed researches will not be elaborated here. Besides, the ER influence on the system has been analysed in reference, 25 which only demonstrates the ER influence on actuator coupling at 10 Hz.…”

“…The above researches have been provided in reference, 25 so the detailed researches will not be elaborated here. Besides, the ER influence on the system has been analysed in reference, 25 which only demonstrates the ER influence on actuator coupling at 10 Hz.…”