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The Study on Damage Identification of Hydraulic Structure Using Information Fusion Technique

Author: DuanFengHu
Tutor: ChenHeAiï¼›LiHuoKun
School: Nanchang University
Course: Water Resources and Hydropower Engineering
Keywords: Hydraulic gate tatic test frequency damage detection information fusion
CLC: TV31
Type: Master's thesis
Year: 2011
Downloads: 33
Quote: 0
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Abstract


Most of the dams and hydraulic structures in China were built in the initial stage of new China.Because the build time is generally long and the use is not standard.a lot of them are in different degree of damage or destruction.When these buildings once damaged, often and easy to cause great damage to life and property. So the timely and effective damage diagnosis and safety assessment before hydraulic structures destroy seems to be especially important and meaningful.Hydraulic gate is an important part of hydraulic structures.which block water and discharge water, and other functions, its security and work normally is very important to the whole water conservancy hub project. So this article is mainly about the gate of hydraulic structures, and study the damage identification method of hydraulic structures.The damage identification of the structure mainly have traditional static test method and developed in recent years based on the structure of the natural modal parameter identification of the dynamic testing method, both each have their advantages and disadvantages. Inspired by this, the author use the information fusion technology, fusion the information of the static and the dynamic testing to damage.find a suitable method for gate structure damage diagnosis,the numerical computation proved the effect is good.This paper mainly do the following research work:(1)Through build the complete finite element model of the radial gate structure, analyse the stress distribution and deformation of the main under hydrostatic pressure loads, explain its easily damage location by calculating, and detect structural damage through the traditional static test.(2)Based on the easily measured frequency parameters in dynamic detection method, according to the conclusion that before and after the structural damage the natural frequency regularization change rate is independence with the damage location, through the establishment of frequency regularization change rate and structural damage location of the diagram, we are succeed in identifying the damage location of the main frame structure of the hydraulic gate.(3)According to the actual operation of the major damage of the gate, establish its major damage location and natural frequency changes in the relationship matrix, through sensitivity analysis, distinguish the damage location and extent of the main framework of the gate.(4)Combined dynamic damage identification methods, using D-S evidence theory of information fusion, integration the damage information of the dynamic testing and static testing.we detect the multi-position damage of gate framework in the location and quantitative.

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CLC: > Industrial Technology > Hydraulic Engineering > Hydraulic structures > Structural theory and computational
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