本文選題：平整度　切入點(diǎn)：車輛振動(dòng)　出處：《重慶交通大學(xué)》2014年碩士論文

【摘要】：車輛在不平整路面上高速行駛，路面對(duì)車輛產(chǎn)生隨機(jī)激勵(lì)，導(dǎo)致車輛垂直振動(dòng)。這種振動(dòng)影響了瀝青路面的動(dòng)力響應(yīng)，使路面平整度的衰減速度加快，車輛行駛與平整度差的路面上產(chǎn)生更大的附加振動(dòng)，因此路面平整度和車輛動(dòng)荷載之間存在耦合關(guān)系。為深入研究路面在車輛振動(dòng)影響下的響應(yīng)情況，必須對(duì)車輛路面耦合動(dòng)力學(xué)模型進(jìn)行研究。 基于車路耦合作用，本文從路面平整度激勵(lì)入手，運(yùn)用隨機(jī)測(cè)量數(shù)理統(tǒng)計(jì)理論依拉達(dá)拉法則對(duì)實(shí)測(cè)平整度指標(biāo)數(shù)據(jù)進(jìn)行預(yù)處理，，建立置信誤差標(biāo)準(zhǔn)對(duì)路面進(jìn)行分段，基于M.W.Sayers理論建立分段路面正弦波形函數(shù)作為車路耦合作用的不平整度激勵(lì)。通過(guò)路段車輛軸載調(diào)查得到高速公路常見(jiàn)載重車型，根據(jù)車輛振動(dòng)理論建立高速公路常見(jiàn)載重車型的車路振動(dòng)力學(xué)模型。運(yùn)用MATLAB軟件編寫(xiě)程序?qū)嵻囕v動(dòng)荷載的計(jì)算，根據(jù)計(jì)算結(jié)果對(duì)平整度波形參數(shù)、車輛行駛速度、車輛載重、車輛輪胎胎壓對(duì)動(dòng)荷載的影響規(guī)律進(jìn)行研究。得到的主要研究結(jié)果有： ①路面不平整度參數(shù)波長(zhǎng)λ、幅值a和標(biāo)準(zhǔn)差σ之間存在著定量關(guān)系。波長(zhǎng)與幅值符合二次多項(xiàng)式擬合關(guān)系，波長(zhǎng)與標(biāo)準(zhǔn)差呈反比例關(guān)系，幅值與標(biāo)準(zhǔn)差呈正比例關(guān)系。 ②運(yùn)用置信誤差α分段后計(jì)算得到的路面的平均標(biāo)準(zhǔn)差較按公里分段計(jì)算平均標(biāo)準(zhǔn)差結(jié)果更可靠精確。 ③二軸車輛（1+2型）后輪動(dòng)荷載和動(dòng)荷載系數(shù)均比前輪�。蝗S車輛（1+5型）后輪動(dòng)荷載和動(dòng)荷載系數(shù)最大，中間輪動(dòng)荷載和動(dòng)荷載系數(shù)最��；四軸車輛掛車前后車輪動(dòng)荷載相差較小且均比拖車車輪動(dòng)荷載和動(dòng)荷載系數(shù)大。 ④車輛動(dòng)荷載均隨著路面的波形幅值和波長(zhǎng)的增大而增大；車輛行駛速度對(duì)車輛動(dòng)載影響較大，隨著車速的增大車輛動(dòng)載和動(dòng)載系數(shù)相應(yīng)增加；車輛動(dòng)載和動(dòng)載系數(shù)隨著載重增加而降低，空車動(dòng)載大不容忽視；超壓行駛車輛產(chǎn)生的動(dòng)荷載和動(dòng)荷載系數(shù)較大，必須嚴(yán)格控制。
[Abstract]:When a vehicle travels at a high speed on an uneven road surface, the road produces random excitation to the vehicle, which results in the vertical vibration of the vehicle. This vibration affects the dynamic response of the asphalt pavement and accelerates the attenuation speed of the pavement smoothness. There is a coupling relationship between the pavement smoothness and the vehicle dynamic load. In order to study the response of the pavement under the influence of vehicle vibration, there is a coupling relationship between the pavement smoothness and the vehicle dynamic load. The coupling dynamic model of vehicle pavement must be studied. Based on the vehicle-road coupling, this paper starts with the road smoothness excitation, uses the random measurement mathematical statistics theory to preprocess the measured smoothness index data, and establishes the confidence error standard to segment the pavement. Based on the M.W.Sayers theory, the sine wave function of segmented pavement is established as the unevenness excitation of vehicle-road coupling. Through the investigation of the axle load of the vehicle in the section of road, the common heavy-duty vehicle model of expressway is obtained. Based on the theory of vehicle vibration, the dynamic model of vehicle vibration of common heavy-duty vehicles on expressway is established. The calculation of vehicle dynamic load is compiled by using MATLAB software. According to the calculation results, the parameters of smoothness waveform, vehicle speed and vehicle load are calculated. The effect of tire tire tire pressure on dynamic load is studied. The main results are as follows:. 1. There is a quantitative relationship between the road roughness parameter wavelength 位, amplitude a and standard deviation 蟽. The relationship between wavelength and amplitude is in accordance with quadratic polynomial fitting, the relationship between wavelength and standard deviation is inverse, and the amplitude is proportional to standard deviation. (2) the average standard deviation calculated by using the confidence error 偽 segment is more reliable and accurate than the average standard deviation calculated by the kilometer section. (3) the coefficient of dynamic load and dynamic load of rear wheel is smaller than that of front wheel, the coefficient of dynamic load and dynamic load of rear wheel is the largest, the coefficient of dynamic load and dynamic load of middle wheel is the smallest. The difference of wheel dynamic load before and after trailers is smaller and larger than that of trailer wheels. (4) the vehicle dynamic load increases with the increase of the amplitude and wavelength of the road waveform, and the vehicle driving speed has a great influence on the vehicle dynamic load, and the vehicle dynamic load and dynamic load coefficient increase with the increase of the speed of the vehicle. The dynamic load and the dynamic load coefficient of the vehicle decrease with the increase of the load load, and the large dynamic load of the empty car can not be ignored; the dynamic load and dynamic load coefficient of the overpressure driving vehicle is large and must be strictly controlled.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U416.2;U461.5

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

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