本文選題：行星輪系 + 動力學(xué)模型��； 參考：《廣州大學(xué)》2017年碩士論文

【摘要】：行星輪系是機械傳動中常見的傳動裝置,由于其自身獨特的結(jié)構(gòu)與功能特點,廣泛應(yīng)用于機械設(shè)備中。但由于其工作環(huán)境的復(fù)雜性與工況的時變性,行星輪系經(jīng)常發(fā)生故障,以至于整個設(shè)備運行出現(xiàn)故障,造成巨大的經(jīng)濟損失。為此,本論文對行星輪系進行損傷建模與故障分析研究。本課題的主要研究內(nèi)容包括三個部分:一、根據(jù)行星輪系的結(jié)構(gòu)與功能特點對其進行簡化,建立動力學(xué)模型。結(jié)合所研究行星輪系具體的結(jié)構(gòu)參數(shù)等,建立其具體動力學(xué)微分方程,并利用MATLAB求解,求得其扭振周期與扭振頻率;二、根據(jù)行星齒輪不同的故障類型——分布式故障與局部故障,研究了嚙合點處振動信號模型、行星輪通過效應(yīng)、傳遞路徑對測試信號的影響等。利用ANSYS對斷齒行星齒輪與裂紋行星齒輪進行有限元模態(tài)分析,通過對不同故障程度的行星齒輪進行模態(tài)分析,研究其變形機理,求得行星齒輪固有頻率與損傷程度的遞變關(guān)系;三、對行星輪系進行故障診斷。根據(jù)行星輪系在機械設(shè)備中的傳動特點,設(shè)計搭建行星輪系故障診斷模擬試驗臺,利用Lab VIEW虛擬儀器設(shè)計振動信號采集軟件系統(tǒng)與算法處理系統(tǒng)。在此基礎(chǔ)上進行行星輪系故障模擬試驗,進而利用基于Huber-M改進的Fast ICA BSS算法對所采集到的振動信號進行分離。利用編寫的算法求得邊帶指數(shù)SI、相對諧波邊帶指relHSI、邊帶能量比SER等SBA指標(biāo)的具體數(shù)值,通過與正常無故障情況下所求得的具體數(shù)值進行比較,診斷其故障類型與故障程度。課題研究表明,通過建立與分析行星輪系動力學(xué)模型,有助于從動力學(xué)的角度去理解其故障機理;對行星齒輪進行有限元模態(tài)分析有助于更直觀的理解其故障變形機理,并有效探討了故障存在時其固有頻率與故障程度的遞變關(guān)系;利用改進的BSS算法處理振動信號能更加快速、精確的分離出目標(biāo)信號,利用SBA指標(biāo)實現(xiàn)了對行星輪系的故障診斷。本課題采用理論與試驗相結(jié)合的方式開展研究,具有一定的科學(xué)性與可行性,且研究結(jié)果表明本課題的研究對行星輪系的故障診斷具有一定的參考實用價值。
[Abstract]:Planetary gear train is a common transmission device in mechanical transmission. It is widely used in mechanical equipment because of its unique structure and function. However, due to the complexity of the working environment and the time-varying working conditions, the planetary gear train often fails, which leads to the failure of the whole equipment, resulting in huge economic losses. Therefore, the damage modeling and fault analysis of planetary gear train are studied in this paper. The main contents of this thesis include three parts: firstly, according to the structure and function of planetary gear train, the dynamic model is established. Combined with the specific structural parameters of the planetary gear train studied in this paper, the specific dynamic differential equations are established, and the torsional vibration period and frequency are obtained by using MATLAB. According to the different fault types of planetary gear, distributed fault and local fault, the vibration signal model at meshing point, the passing effect of planetary gear and the influence of transmission path on test signal are studied. The finite element modal analysis of broken gear and cracked planetary gear is carried out by ANSYS. Through modal analysis of planetary gear with different fault degree, the deformation mechanism of planetary gear is studied, and the relationship between natural frequency and damage degree of planetary gear is obtained. Third, fault diagnosis of planetary gear train. According to the transmission characteristics of planetary gear train in mechanical equipment, the fault diagnosis simulation test bed of planetary gear train is designed and built, and the vibration signal acquisition software system and algorithm processing system are designed by using LabVIEW virtual instrument. On this basis, the fault simulation test of planetary gear train is carried out, and the vibration signals are separated by using the improved Fast ICA BSS algorithm based on Huber-M. The SBA indexes such as sideband index SI, relative harmonic sideband finger relHSI, sideband energy ratio SER and so on are obtained by using the algorithm, and the fault types and fault degree are diagnosed by comparing them with those obtained under normal non-fault condition. The research shows that establishing and analyzing the dynamic model of planetary gear train is helpful to understand the fault mechanism of planetary gear train from the angle of dynamics, and the finite element modal analysis of planetary gear is helpful to understand the mechanism of fault deformation more intuitively. The relationship between the natural frequency and the degree of fault is discussed effectively, and the improved BSS algorithm is used to process the vibration signal more quickly and accurately, and the fault diagnosis of the planetary gear train is realized by using the SBA index. The research is carried out by the combination of theory and experiment, which is scientific and feasible, and the research results show that the research of this topic has certain reference practical value to the fault diagnosis of planetary gear train.
【學(xué)位授予單位】：廣州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TH132.425

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