本文選題：模態(tài)分析 + 動態(tài)特性測試　； 參考：《華中科技大學(xué)》2015年碩士論文

【摘要】：微米尺寸結(jié)構(gòu)應(yīng)用廣泛,非常規(guī)的使用環(huán)境對其動態(tài)特性要求比宏觀結(jié)構(gòu)高,依然采用宏觀結(jié)構(gòu)測振系統(tǒng)無法滿足對微小結(jié)構(gòu)的有效激勵與測振。針對實際測試需求,本文搭建了以壓電底座激勵和多普勒激光技術(shù)相結(jié)合的微結(jié)構(gòu)測試系統(tǒng),實現(xiàn)微懸臂梁前七階固有振動的有效激勵和模態(tài)參數(shù)的提取,探究微懸臂梁不同區(qū)段厚度變化對動態(tài)特性的影響。論文工作如下:(1)對微結(jié)構(gòu)激勵方法、振動檢測技術(shù)及試驗?zāi)B(tài)估計方法進行了綜述,對基于壓電陶瓷的激勵方式與多普勒測振原理進行了詳細介紹,并完成了測振系統(tǒng)中的各部分選型和整體搭建。設(shè)計了微懸臂梁對比實驗并選擇可行的尺寸控制方法,有限元方法計算出固有頻率受厚度尺寸的影響,仿真證明了寬度方向的尺寸微小變化對測試結(jié)果的影響可以忽略。(2)建立了微懸臂梁頻響函數(shù)測試誤差模型,選擇了合理頻響估計。采用快速正弦掃描激勵,完成了微懸臂梁振動測試,由頻響函數(shù)計算出脈沖響應(yīng),引入最小二乘復(fù)指數(shù)法進行模態(tài)分析,建立了極點穩(wěn)態(tài)圖,并依據(jù)模態(tài)判斷準則合理挑選出極點,實現(xiàn)了模態(tài)參數(shù)計算。完成對照實驗中不同厚度微懸臂梁的模態(tài)參數(shù)提取,并詳細分析了不同區(qū)段厚度變化對各階固有頻率的影響規(guī)律。本文研究工作完善了微尺寸結(jié)構(gòu)的實驗?zāi)B(tài)分析方法,對推動動態(tài)特性測試技術(shù)的發(fā)展具有一定意義。
[Abstract]:The micrometer structure is widely used, and its dynamic characteristics are required higher in the unconventional environment than in the macro structure. The vibration measurement system still can not satisfy the effective excitation and vibration measurement of the micro structure. According to the actual test demand, a micro-structure testing system based on piezoelectric pedestal excitation and Doppler laser technology is built to realize the effective excitation and modal parameter extraction of the first seven natural vibration of the micro-cantilever beam. The effect of thickness variation of different sections on dynamic characteristics of micro cantilever beam was investigated. The main work of this paper is as follows: (1) the excitation methods, vibration detection techniques and experimental modal estimation methods of microstructures are summarized, and the excitation mode based on piezoelectric ceramics and the principle of Doppler vibration measurement are introduced in detail. And completed the vibration measurement system in each part of the selection and the overall construction. The contrast experiment of micro-cantilever beam is designed and the feasible dimension control method is selected. The finite element method calculates that the natural frequency is affected by the thickness dimension. The simulation results show that the influence of the small change of the width direction on the test results can be neglected. (2) the error model of the frequency response function of the micro cantilever beam is established, and the reasonable frequency response estimation is selected. The vibration test of micro-cantilever beam was completed by using fast sine scanning excitation. The pulse response was calculated by frequency response function, and the modal analysis was carried out by introducing the least square complex exponent method, and the pole steady-state diagram was established. According to the modal judgment criterion, the poles are reasonably selected, and the modal parameter calculation is realized. The modal parameters of micro-cantilever beams with different thickness were extracted and the influence of thickness of different sections on the natural frequencies was analyzed in detail. In this paper, the experimental modal analysis method of micro-size structures is improved, which is of great significance to the development of dynamic characteristic testing technology.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TH825

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本文編號：1990919