Method for predicting flood discharge induced site vibration on basis of random transfer function processes

Abstract

The invention discloses a method for predicting flood discharge induced site vibration on the basis of random transfer function processes. The method includes carrying out filter processing on measured signals of each single vibration source and combining the measured signals with one another to obtain multi-vibration-source excitation source signals to be used as input signals; carrying out filter processing on measured signals of output measured points to obtain output response signals; establishing transfer functions on the basis of the input signals and the output response signals; computing prediction result signals on the basis of unbiased estimation processes for the transfer functions; superposing noise sequences on the basis of the prediction result signals to obtain ultimate prediction results. The method has the advantages that the method is applicable to predicting the site vibration by the aid of multi-excitation-source water flow pulse load combined excitation input systems, accordingly, the accurate prediction results can be obtained, and scientific bases can be provided for pre-judging and estimating the flood discharge induced site vibration.

Description

technical field [0001] The invention relates to a method for predicting site vibration induced by flood discharge based on a random transfer function method, and belongs to the technical field of water conservancy and hydropower engineering. Background technique [0002] The site vibration caused by high dam flood discharge occurs repeatedly and lasts for a long time, which is likely to cause hazards such as foundation liquefaction, uneven settlement of building foundations, and cracking of building walls. It will adversely affect the normal work of precision instruments, cause secondary noise in buildings, and easily induce resonance in buildings. At the same time, the vibration will interfere with the normal life of residents and have a certain degree of physical and mental impact. Therefore, in the actual operation of hydropower stations, predicting the site vibration induced by flood discharge, predicting the site vibration intensity, and evaluating the impact of vibrat...

AI Technical Summary

Problems solved by technology

However, the site vibration induced by dam discharge is a multi-factor coupling dynamic problem under the interaction and influence of "dynamic water load-dam body-stilling basin-foundation-site". The prediction of site vibration involves: 1) dynamic water load- Discharge structure interaction system; 2) Discharge structure-dam foundation interaction system; 3) Formation vibration wave propagation system, the three subsystems interact and couple with each other, and there are various vibration transmission processes of each subsystem. Influenced by various disturbance factors and uncertain factors, the site vibration problem induced by high dam flood discharge is extremely complicated

[0004] In the past, the prediction of site vibration and other issues through the transfer function was mostly realized by establishing the relationship between a single excitation and a single response. There are few studies on the single response output prediction under the excitation of multiple excitation sources such as the site vibration induced by high dam flood discharge. At present, there is no A relatively reasonable prediction method of site vibration induced by flood discharge, which can obtain more accurate prediction results

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