本文選題：應(yīng)變頻響函數(shù)參數(shù)　切入點(diǎn)：數(shù)值分析　出處：《武漢理工大學(xué)》2012年碩士論文　論文類型：學(xué)位論文

【摘要】：現(xiàn)代化生產(chǎn)的高速高效發(fā)展使得機(jī)械設(shè)備不得不面臨日益復(fù)雜的工作條件和越來(lái)越長(zhǎng)的工作時(shí)間,如此機(jī)械設(shè)備結(jié)構(gòu)會(huì)不可避免的受到損傷,而且由各種小損傷導(dǎo)致的重大災(zāi)難性事故更是屢見(jiàn)不鮮。對(duì)于結(jié)構(gòu)中的微小損傷的識(shí)別,必須應(yīng)用對(duì)損傷具有更敏感識(shí)別能力的應(yīng)變型指標(biāo)�；谡駝�(dòng)的損傷識(shí)別是目前實(shí)際工程應(yīng)用最為廣泛的方法,而基于應(yīng)變類頻響函數(shù)參數(shù)的損傷識(shí)別指標(biāo)也得到越來(lái)越多的關(guān)注。應(yīng)變損傷識(shí)別參數(shù)的準(zhǔn)確性,依賴于應(yīng)變傳感器對(duì)損傷結(jié)構(gòu)應(yīng)變場(chǎng)的準(zhǔn)確測(cè)量,用傳統(tǒng)的電氣類傳感器作分布式測(cè)量繁瑣而低效,光纖光柵應(yīng)變傳感器體小、質(zhì)輕、抗電磁干擾,更具有可波分復(fù)用的優(yōu)勢(shì),是結(jié)構(gòu)應(yīng)變場(chǎng)測(cè)量不可多得的一種傳感器。 本文以工程應(yīng)用中十分常見(jiàn)的四角點(diǎn)固定支撐的45#薄鋼板作為研究對(duì)象,并以應(yīng)變類頻響函數(shù)作為振動(dòng)損傷識(shí)別指標(biāo)的基礎(chǔ),利用其相關(guān)參數(shù)對(duì)薄板結(jié)構(gòu)上的裂紋損傷進(jìn)行識(shí)別。 對(duì)此本文詳細(xì)分析了該薄板結(jié)構(gòu)的橫向振動(dòng)特性,進(jìn)行了數(shù)值分析計(jì)算和大量的實(shí)驗(yàn)研究并對(duì)實(shí)驗(yàn)所測(cè)得的信號(hào)進(jìn)行了處理分析�；趽p傷識(shí)別指標(biāo)應(yīng)變頻響函數(shù)靈敏度參數(shù)βsfrf和應(yīng)變功率譜密度頻響函數(shù)靈敏度參數(shù)βpsd,本文利用ANSYS有限元分析軟件對(duì)四角點(diǎn)固定支撐薄板結(jié)構(gòu)實(shí)現(xiàn)了不同位置裂紋損傷識(shí)別的模擬仿真分析；并在此基礎(chǔ)上搭建了基于FBG分布傳感的實(shí)驗(yàn)測(cè)試系統(tǒng),通過(guò)對(duì)實(shí)驗(yàn)所得的結(jié)構(gòu)應(yīng)變矩陣的分析,成功提取了應(yīng)變類頻響函數(shù),分別給出了應(yīng)變頻響函數(shù)靈敏度參數(shù)βsfrf和應(yīng)變功率譜密度頻響函數(shù)靈敏度參數(shù)βpsd兩種損傷識(shí)別指標(biāo)矩陣的三維柱狀圖,得出應(yīng)變功率譜密度頻響函數(shù)靈敏度參數(shù)βpsd在實(shí)際應(yīng)用中能夠更好的對(duì)薄板結(jié)構(gòu)中的裂紋損傷進(jìn)行識(shí)別。
[Abstract]:With the rapid and efficient development of modern production, machinery and equipment have to face increasingly complex working conditions and longer and longer working hours, so the structure of machinery and equipment will inevitably be damaged. And major catastrophic accidents caused by various minor injuries are common. For the identification of minor damage in structures, It is necessary to apply the strain type index which is more sensitive to damage identification. Vibration based damage identification is the most widely used method in practical engineering at present. More and more attention has been paid to the damage identification index based on strain frequency response function parameters. The accuracy of strain damage identification parameters depends on the accurate measurement of strain field of damaged structure by strain sensor. Traditional electrical sensors are used for distributed measurement, which are complicated and inefficient. Fiber Bragg grating strain sensors are small, light, anti-electromagnetic interference, and have the advantage of wavelength division multiplexing. It is a rare sensor for structural strain field measurement. In this paper, 4thin steel plate with four corners fixed support is used as the research object, and the frequency response function of strain class is used as the foundation of vibration damage identification index. The crack damage of thin plate structure is identified by the relevant parameters. In this paper, the transverse vibration characteristics of the thin plate structure are analyzed in detail. Numerical analysis and a large number of experimental studies have been carried out, and the signal measured in the experiment has been processed and analyzed. Sensitivity parameter 尾 sfrf of strain frequency response function based on damage identification index and sensitivity of frequency response function of strain power spectral density. In this paper, ANSYS finite element analysis software is used to simulate and analyze the crack damage identification of four-corner fixed-supported thin plate structure at different positions. On this basis, an experimental testing system based on FBG distributed sensing is built. By analyzing the structural strain matrix obtained from the experiment, the frequency response function of strain class is extracted successfully. The three dimensional histogram of strain frequency response function sensitivity parameter 尾 sfrf and strain power spectral density frequency response function sensitivity parameter 尾 psd are given. It is concluded that the strain power spectrum density frequency response function sensitivity parameter 尾 psd can better identify the crack damage in thin plate structure in practical application.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類號(hào)】：TH165.3

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