Vibration transmission path identification in a hydropower house based on a time-delayed transfer entropy method

Abstract

This article aims to explore the vibration transmission path in the hydropower house using the time-delayed transfer entropy method. A three-dimensional fluid-concrete structure-hydraulic machinery coupling simulation model of the Xiangjiaba hydropower house was established, and the vibration acceleration and equivalent stress of the structure were calculated in the time domain based on the two-way iterative fluid-structure interaction method. The characteristic indexes of information transmission were quantitatively presented, including the rate of information transmission, transmission path contribution, to describe the vibration energy transmission paths and transmission characteristics of different vibration variables as well as different directions of the same variable in the hydropower house. The study indicates that the vertical acceleration can identify more abundant vibration transmission paths, and the lower bracket contributes most to the vibration transmission of the powerhouse. The research outcome can provide a scientific basis for structural optimization, vibration attenuation, and isolation design of the hydropower house.

Study on Vibration-Transmission-Path Identification Method for Hydropower Houses Based on CEEMDAN-SVD-TE

“…T y→x ( x(1)|x, y(τ)) = p(x(1), x, y(τ)) log 2 p(x(1), x, y(τ))dx(1)dxdy(τ) + p(x) log 2 p(x)dx − p(x, y(τ)) log 2 p(x, y(τ))dxdy(τ) − p(x(1), x) log 2 p(x(1), x)dx(1)dx (13) In order to quantitatively describe the transmission regularity of vibration energy, the information-transmission rate (ITR) index is introduced [35,36], which is calculated based on the transfer entropy and can effectively describe the information-transmission strength of vibration energy. For vibration signals y and x, the ITR is:…”

“…Wang [34] and Wang [35] have also attempted to investigate the structural response by the transfer entropy based on data acquired from field tests rather than numerical simulations. Zhang [36] applies the transfer entropy to the vibration-response analysis of the powerhouse structure to describe the vibration-transfer energy characteristics of different variables and the same variable in different directions. In this research, transfer entropy is introduced and verified as an innovative method that can analyze vibration-transmission paths based on structural vibration response data.…”

An Energy-Equivalent Simplified Model for Lateral Nonlinear Vibrations of Coupled Water Turbine Generator Set Shaft-Foundation System

“…Wu and Zhang et al [13,14] developed a whole coupling model for hydropower station considering hydro-mechanical-electric and structure system, and the corresponding dynamic properties under different operation cases were studied. Zhang and Wang et al [15] built whole fluid-machinery-concrete structure coupling finite element model and studied the vibration transmission path in the hydropower plant using the time-delayed transfer entropy method. Song and Ma et al [16] established the coupling mechanical model including a water turbine generator set and hydropower plant, its transitional running condition is analyzed so as to evaluate the effect of hydropower house foundation and each pad's nonlinear dynamic coefficients on system response.…”