發(fā)布時(shí)間：2018-06-15 09:06

  本文選題：振動(dòng)參數(shù) + 傅里葉變換��； 參考：《中北大學(xué)》2016年碩士論文

【摘要】：運(yùn)載火箭在發(fā)射過(guò)程中所形成的發(fā)射環(huán)境,使發(fā)射塔架承受一定程度的激振,這會(huì)對(duì)發(fā)射塔架造成相應(yīng)的損壞,隨著火箭發(fā)射次數(shù)的增加,發(fā)射塔架遭受的損壞逐漸積累,這會(huì)使發(fā)射塔架的狀態(tài)變得不穩(wěn)定,影響到火箭發(fā)射任務(wù)的成功與否,因此有必要對(duì)火箭發(fā)射時(shí)發(fā)射塔架所承受的振動(dòng)強(qiáng)度進(jìn)行測(cè)試,而運(yùn)載火箭造成的發(fā)射環(huán)境是極其復(fù)雜惡劣的,這使測(cè)得的發(fā)射塔架振動(dòng)參數(shù)帶有一定的噪聲,無(wú)法精確的為發(fā)射塔架所承受振動(dòng)強(qiáng)度的評(píng)估提供依據(jù),因此本文研究發(fā)射環(huán)境下發(fā)射塔架振動(dòng)參數(shù)的分析處理方法,從而為發(fā)射塔架的健康評(píng)估和壽命預(yù)測(cè)提供依據(jù)。在對(duì)發(fā)射塔架振動(dòng)參數(shù)測(cè)試儀的變送器和采編存儲(chǔ)器設(shè)計(jì)方案以及電路設(shè)計(jì)進(jìn)行介紹的基礎(chǔ)上,采用發(fā)射塔架振動(dòng)參數(shù)測(cè)試儀測(cè)得發(fā)射塔架兩個(gè)不同測(cè)點(diǎn)的振動(dòng)參數(shù),并繪制出振動(dòng)參數(shù)波形圖。分析了傅里葉變換、小波變換和小波包變換的優(yōu)缺點(diǎn)和適用范圍。傅里葉變換不適合對(duì)發(fā)射塔架振動(dòng)參數(shù)這種非平穩(wěn)信號(hào)進(jìn)行降噪處理,而小波變換和小波包變換則適合處理非平穩(wěn)信號(hào),因此采用小波變換和小波包變換對(duì)振動(dòng)參數(shù)進(jìn)行降噪處理,并計(jì)算降噪后振動(dòng)參數(shù)的信噪比和均方根誤差,結(jié)果表明小波包變換對(duì)振動(dòng)參數(shù)的降噪效果優(yōu)于小波變換。振動(dòng)參數(shù)經(jīng)過(guò)降噪后,在主振頻率、非平穩(wěn)性和頻帶能量分布方面對(duì)振動(dòng)參數(shù)進(jìn)行了特征分析。采用傅里葉變換對(duì)振動(dòng)參數(shù)進(jìn)行頻譜分析,為研究發(fā)射塔架的振動(dòng)特性、振型和動(dòng)力反應(yīng)提供依據(jù);采用小波變換對(duì)振動(dòng)參數(shù)進(jìn)行時(shí)頻分析,為研究發(fā)射塔架振動(dòng)參數(shù)非平穩(wěn)隨機(jī)特性提供依據(jù);采用小波包變換對(duì)振動(dòng)參數(shù)進(jìn)行頻帶能量分析,計(jì)算各頻帶能量占總能量的百分比。綜合這三種分析能夠?qū)蓚�(gè)振動(dòng)參數(shù)對(duì)應(yīng)的發(fā)射塔架測(cè)點(diǎn)處的損壞進(jìn)行評(píng)估。通過(guò)上述方法對(duì)發(fā)射塔架振動(dòng)參數(shù)進(jìn)行處理和分析后,可以很好的為發(fā)射塔架在振動(dòng)強(qiáng)度評(píng)估方面提供依據(jù),符合本課題的研究目的。
[Abstract]:The launching environment formed by the launch vehicle during the launch process causes the launching tower frame to withstand a certain degree of excitation, which will cause corresponding damage to the launch tower frame. With the increase of the number of rocket launches, the damage to the launch tower frame gradually accumulates. This makes the status of the launch tower frame unstable and affects the success of the rocket launch mission, so it is necessary to test the vibration intensity of the launch tower frame when the rocket is launched. However, the launch environment caused by the launch vehicle is extremely complex and harsh, which makes the vibration parameters of the launch tower have certain noise, which can not accurately provide the basis for the assessment of the vibration intensity of the launch tower frame. Therefore, this paper studies the analysis and processing method of the vibration parameters of the launching tower under launch environment, thus providing the basis for the health evaluation and life prediction of the launching tower. On the basis of introducing the design scheme of transmitter, acquisition memory and circuit design of the transmitter and acquisition memory of the testing instrument of the vibration parameters of the launch tower, the vibration parameters of the two different measuring points of the tower are measured by using the test instrument of the vibration parameters of the launching tower. The waveform diagram of vibration parameters is drawn. The advantages and disadvantages of Fourier transform, wavelet transform and wavelet packet transform are analyzed. Fourier transform is not suitable for noise reduction of non-stationary signals such as the vibration parameters of transmission tower, but wavelet transform and wavelet packet transform are suitable for processing non-stationary signals. So wavelet transform and wavelet packet transform are used to reduce the noise of vibration parameters, and the signal-to-noise ratio and root mean square error of vibration parameters are calculated. The results show that wavelet packet transform is better than wavelet transform in noise reduction of vibration parameters. After noise reduction, the vibration parameters are analyzed in terms of main frequency, non-stationarity and frequency band energy distribution. The Fourier transform is used to analyze the frequency spectrum of the vibration parameters, which provides the basis for the study of the vibration characteristics, modes and dynamic responses of the launch tower, and the wavelet transform is used for the time-frequency analysis of the vibration parameters. This paper provides the basis for studying the non-stationary random characteristics of the vibration parameters of the launch tower and uses the wavelet packet transform to analyze the frequency band energy of the vibration parameters and calculate the percentage of the energy of each frequency band to the total energy. Combined with these three kinds of analysis, the damage of the measuring point of the tower frame corresponding to the two vibration parameters can be evaluated. After processing and analyzing the vibration parameters of the tower, the method can provide a good basis for the vibration strength evaluation of the launching tower frame, which is in line with the purpose of this research.
【學(xué)位授予單位】：中北大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：V553

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本文編號(hào)：2021496