本文關(guān)鍵詞： 摩擦副 磨合 摩擦振動 互相關(guān)理論 相關(guān)分析　出處：《大連海事大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：摩擦振動是摩擦副磨合磨損過程中表面微凸體碰撞產(chǎn)生的一種物理現(xiàn)象,是摩擦學(xué)系統(tǒng)的輸出特征之一,蘊(yùn)涵著反映摩擦副磨合磨損過程的摩擦學(xué)信息和動力學(xué)信息。然而,摩擦振動是低信噪比的微弱信號,常被強(qiáng)烈的背景噪聲所淹沒,難以反映摩擦副磨損狀態(tài)的變化,因此如何實(shí)現(xiàn)摩擦振動信號的提取和識別顯得尤為重要。相關(guān)分析研究的是信號間的相互依存關(guān)系,可用于信號的識別和提取。摩擦磨損過程中表面微凸體碰撞能同時激發(fā)切向和法向摩擦振動,二者為同源信號,存在一定的依存關(guān)系。因此,通過切向和法向摩擦振動的相關(guān)性研究可為摩擦振動識別和提取提供一種新思路。本文以往復(fù)滑動摩擦副磨合磨損試驗(yàn)中采集的摩擦振動信號為研究對象,應(yīng)用互相關(guān)理論對摩擦振動信號的相關(guān)性進(jìn)行了研究,主要的研究內(nèi)容和結(jié)論如下:首先,應(yīng)用互相關(guān)理論對試驗(yàn)過程中采集的含有噪聲的摩擦振動信號進(jìn)行了分析,結(jié)果表明,含有噪聲的切向和法向摩擦振動信號存在時間延遲,互相關(guān)系數(shù)小,相關(guān)程度低。因此,含有噪聲的信號不能反映切向和法向摩擦振動的同源特性。為了剔除噪聲的影響,應(yīng)用諧波小波包變換理論對采集的摩擦振動信號進(jìn)行降噪,提取了反映摩擦副磨合磨損狀態(tài)變化的信號,并對其進(jìn)行了相關(guān)分析,結(jié)果表明:降噪后的切向和法向摩擦振動信號無時間延遲,互相關(guān)系數(shù)大,相關(guān)程度高。因此,經(jīng)諧波小波包降噪后的信號反映了切向和法向摩擦振動的同源特性。在上述研究基礎(chǔ)上,本文對摩擦副磨合磨損過程中不同時刻的切向和法向摩擦振動信號的互相關(guān)系數(shù)進(jìn)行了分析,結(jié)果表明:降噪后的切向和法向摩擦振動信號的互相關(guān)系數(shù)與摩擦系數(shù)呈現(xiàn)出一致的變化趨勢,反映了摩擦副從磨合磨損到穩(wěn)定磨損的變化。
[Abstract]:The friction vibration is friction wear side a physical phenomenon occurred in the process of surface asperity collisions, is one of the output characteristics of tribology system, contains the friction wear process reflects the vice tribology information and dynamical information. However, the friction vibration is a weak signal with low SNR, often submerged in strong background noise the change is difficult to reflect the wear state, so how to realize the extraction and identification of friction vibration signal is very important. The correlation analysis is the study of mutual dependency relation between the signals, and can be used for signal recognition and extraction. The friction and wear process of surface asperity collisions can be excited at the same time to the normal and tangential friction vibration, two for the homologous signal, have certain dependency relation. Therefore, the relationship between the tangential and normal friction vibration can provide a new idea for the identification and extraction of friction vibration The road. This paper takes reciprocating sliding friction wear of friction vibration signals collected in the trial as the research object, the correlation based on cross-correlation theory of friction vibration signal is studied, the main research contents and conclusions are as follows: firstly, based on cross-correlation theory is analyzed, the friction vibration signal containing noise acquisition test process the results show that the noise to the normal and tangential friction vibration signals with time delay, the relationship between the number of small, low degree of correlation. Therefore, the noise signal can not reflect the characteristics and method to cut homologous to friction and vibration. In order to eliminate the influence of noise, the application of harmonic wavelet packet transform theory of friction vibration signal the acquisition of the extracted signal noise, friction vice state change of running in wear, and has carried on the correlation analysis results show that the noise reduction to the normal and tangential friction vibration Dynamic signals without time delay, correlation coefficient, correlation degree is high. Therefore, the harmonic signal after wavelet packet de-noising reflects the tangential and normal homologous characteristics of friction vibration. On the basis of the above study, this paper at different times in the process of friction wear side cut each other to the relationship and normal friction vibration the number of signal are analyzed. The results show that the denoised tangential and normal cross-correlation coefficient and friction coefficient of the friction vibration signal showing the same trend, reflecting the friction wear to change from stable wear.

【學(xué)位授予單位】：大連海事大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TH117.1

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本文編號：1540588