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Shock and Vibration
Volume 2016, Article ID 5039578, 9 pages
http://dx.doi.org/10.1155/2016/5039578
Research Article

Study of the Vibration Transmission and Path Recognition of an Underground Powerhouse Using Energy Finite Element Method

1School of Civil and Hydraulic Engineering, Dalian University of Technology, Dalian, Liaoning 116024, China
2College of Water Resource, Shenyang Agricultural University, Shenyang, Liaoning 110866, China

Received 19 August 2015; Revised 7 October 2015; Accepted 15 October 2015

Academic Editor: Marcello Vanali

Copyright © 2016 Wei Xu and Zhen-yue Ma. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Taking the underground powerhouse of a pumped storage power station as the engineering background, this study established a 3D finite element model of the main and auxiliary powerhouse and performed the dynamic harmonica calculation for its fluctuating pressure. Based on the power flow theory, the ANSYS Parametric Design Language (APDL) procedure was completed to calculate the power transmission in the powerhouse. The law of dominant path recognition was first proposed to assess the structure’s dominant transmission using a numerical solution on nodes in the model. The conductivity of the closed-cell foam that filled the structure’s joints was examined, as were the dynamic transmission features of the rock around and beneath the powerhouse. The results indicated that, as a structural joint filler, closed-cell foam could actively restrict vibration transmission, and the directions of dynamic transmission were mainly perpendicular to and along the river in the foundation rock. Approximately 20 percent of the foundation rock beneath the auxiliary powerhouse was disturbed by the concrete around the spiral case and induced vibrations in the powerhouse’s lower floors. Vibration in the higher floors was derived from downstream rock, and the dynamic transmission effect had a clear advantage along the horizontal direction.