本文選題：脫空檢測 + FFT　； 參考：《長安大學(xué)》2014年碩士論文

【摘要】：進(jìn)入到21世紀(jì)以來，我國的交通建設(shè)取得了突飛猛進(jìn)發(fā)展，特別是在公路建設(shè)領(lǐng)域已經(jīng)創(chuàng)下新的里程。然而，水泥混凝土路面在使用過程中，由于車輛載荷的重復(fù)作用，在板角、接縫兩側(cè)會由于基層的塑性變形產(chǎn)生脫空，最終導(dǎo)致面板破壞。水泥混凝土路面脫空現(xiàn)象是大量存在的。路面脫空得不到及時的養(yǎng)護(hù)處理，會對國民經(jīng)濟(jì)造成很大損失，一定程度上還影響交通的正常運(yùn)行。那么如何準(zhǔn)確的測定脫空范圍，及時采取有效的修復(fù)措施，對于提高水泥混凝土路面的使用價值、延長使用壽命、減少養(yǎng)護(hù)成本，具有重大的研究意義。 本文是基于試驗(yàn)?zāi)B(tài)分析的方法對水泥混凝土路面進(jìn)行檢測，利用FFT和HHT對振動信號進(jìn)行處理分析。介紹了信號的處理流程和聲振法的基本理論以及波動理論�；贛ATLAB軟件對振動信號進(jìn)行傳統(tǒng)傅里葉變換頻譜分析，來對水泥混凝土路面脫空狀況進(jìn)行判斷。由于路面的不均質(zhì)特性、脫空大小的不同以及外界環(huán)境因素的影響，這樣會給實(shí)際的檢測帶來很多不確定因素，F(xiàn)FT振動信號處理的效果不是很明顯。因此，介紹的新的信號處理方法HHT變換。這種方法首先對振動信號進(jìn)行EMD分解，得到IMF分量和殘余分量(),然后在對每一個IMF進(jìn)行Hilbert譜分析，將得到每一個IMF的Hilbert譜進(jìn)行組合得到信號邊際譜，通過分析邊際譜中特征參數(shù)，來對水泥混凝土路面脫空狀況進(jìn)行判定。 結(jié)合試驗(yàn)?zāi)B(tài)分析對試驗(yàn)數(shù)據(jù)進(jìn)行實(shí)際的模擬，通過建立薄板實(shí)驗(yàn)?zāi)Ｐ�，研究脫空薄板振動變化�?guī)律為實(shí)際水泥混凝土路面脫空檢測提供理論支持。在HHT邊際譜的基礎(chǔ)上提出了HHT三維顯示圖，，更加有效地顯示振動信號的振動狀態(tài)。介紹了HHT變換處理振動信號在實(shí)際工程中的應(yīng)用，通過分析數(shù)據(jù)檢測這種方法的檢測效率、實(shí)用性，使得在水泥混凝土路面脫空檢測理論體系更加完善。
[Abstract]:Since entering the 21st century, China's traffic construction has made rapid development, especially in the field of highway construction has set a new mileage. However, in the process of using cement concrete pavement, due to the repeated action of vehicle load, the plastic deformation of the base course will lead to the void in the angle of the plate and the two sides of the joint, which will eventually lead to the failure of the slab. The phenomenon of cement concrete pavement void is a large number. It will cause great loss to the national economy and affect the normal operation of traffic to a certain extent. Therefore, how to accurately measure the void range and take effective repair measures in time is of great significance for improving the use value of cement concrete pavement, prolonging the service life and reducing the maintenance cost. In this paper, the cement concrete pavement is tested based on the experimental modal analysis method, and the vibration signal is processed and analyzed by FFT and HHT. The basic theory and wave theory of signal processing and acoustic vibration method are introduced. The traditional Fourier transform spectrum analysis of vibration signal is carried out based on MATLAB software to judge the void state of cement concrete pavement. Due to the uneven quality of pavement, the difference of void size and the influence of external environmental factors, this will bring many uncertain factors to the actual detection and the effect of FFT vibration signal processing is not obvious. Therefore, a new signal processing method, HHT transform, is introduced. This method firstly decomposes the vibration signal by EMD, and obtains the IMF component and the residual component. Then the Hilbert spectrum of each IMF is analyzed, and the Hilbert spectrum of each IMF is combined to get the marginal spectrum of the signal. By analyzing the characteristic parameters in the marginal spectrum, the void condition of cement concrete pavement is determined. Based on the experimental modal analysis, the experimental data are simulated. Through establishing the thin plate experimental model, the vibration variation law of the voided thin plate is studied to provide theoretical support for the actual cement concrete pavement void detection. Based on the HHT marginal spectrum, a HHT 3D display is presented, which can show the vibration state of the vibration signal more effectively. This paper introduces the application of HHT transform in practical engineering. The detection efficiency and practicability of this method are analyzed, which makes the theoretical system of void detection in cement concrete pavement more perfect.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U416.216;TN911.7

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