發(fā)布時間：2018-05-20 02:15

  本文選題：大型礦用車 + 多軸轉(zhuǎn)向　； 參考：《華中科技大學(xué)》2015年碩士論文

【摘要】：迄今為止,由于存在諸多未解決的問題導(dǎo)致大型非公路輪式車輛的發(fā)展仍比較緩慢,如底盤油氣懸架在車身的平衡性調(diào)節(jié)時無法達(dá)到整車的水平升降、車輛設(shè)計時沒有綜合考慮到平穩(wěn)性、電液控制轉(zhuǎn)向大多數(shù)還采用比例閥控制,轉(zhuǎn)向效果不佳。本文以武漢天捷重工某四軸大型礦用車為對象,圍繞電液控制轉(zhuǎn)向系統(tǒng)的設(shè)計與分析展開研究。在查閱大量國內(nèi)外有關(guān)大型礦用車的文獻(xiàn)以及各主要生產(chǎn)廠家產(chǎn)品的基礎(chǔ)上,總結(jié)了大型礦用車發(fā)展方向以及轉(zhuǎn)向系統(tǒng)的發(fā)展趨勢,介紹了以流量放大器為主要元器件的電液控制轉(zhuǎn)向系統(tǒng)。針對該四軸礦用車輛的特點設(shè)計了前兩軸以傳統(tǒng)連桿式、后兩軸以應(yīng)用伺服比例閥的電液控制的轉(zhuǎn)向形式,分別簡述了轉(zhuǎn)向系統(tǒng)的功能、轉(zhuǎn)向模式以及液壓工作原理。建立了轉(zhuǎn)向系統(tǒng)的數(shù)學(xué)模型,并進(jìn)行了線性化的動力學(xué)分析,討論了系統(tǒng)的頻率響應(yīng)、閥控液壓缸的動態(tài)剛度以及系統(tǒng)誤差,為后面的系統(tǒng)仿真提供理論依據(jù)�；贏MESim的液壓庫建立轉(zhuǎn)向系統(tǒng)的液壓部分,利用其平面機(jī)構(gòu)庫建立轉(zhuǎn)向機(jī)構(gòu)模型。在各主要工況下,仿真討論了系統(tǒng)各參數(shù)對轉(zhuǎn)向跟蹤性的影響,如比例環(huán)節(jié)增益、助力缸的泄露系數(shù)、伺服比例閥的頻響、伺服比例閥的死區(qū)和滯環(huán)、管路長度和內(nèi)徑。該仿真結(jié)果很好的印證了數(shù)學(xué)模型的理論分析,最主要的是為以后的大型礦用車轉(zhuǎn)向系統(tǒng)分析和設(shè)計提供了參照。
[Abstract]:Up to now, due to many unsolved problems, the development of large off-road wheeled vehicles is still slow, such as the chassis hydro-pneumatic suspension can not reach the level of the whole vehicle when adjusting the balance of the body. When the vehicle is designed, the stability is not considered synthetically, and most of the electro-hydraulic steering is controlled by proportional valve, so the steering effect is not good. This paper focuses on the design and analysis of an electro-hydraulic steering system for a four-axis mining vehicle of Wuhan Tianjie heavy Industry. On the basis of consulting a large number of domestic and international documents on large mining vehicles and the products of major manufacturers, the development direction of large scale mining vehicles and the development trend of steering system are summarized. An electro-hydraulic steering system with flow amplifier as its main component is introduced. According to the characteristics of the four-axle mining vehicle, the former two shafts are designed in the form of traditional connecting rod and the latter two shafts in the form of electro-hydraulic control with servo proportional valve. The function, steering mode and hydraulic working principle of steering system are described respectively. The mathematical model of steering system is established, and the dynamic analysis of linearization is carried out. The frequency response of the system, the dynamic stiffness of the valve controlled hydraulic cylinder and the system error are discussed, which provides the theoretical basis for the system simulation. The hydraulic part of the steering system is established based on the hydraulic storehouse of AMESim, and the steering mechanism model is established by using the plane mechanism library. The effects of system parameters on steering tracking, such as proportional gain, leakage coefficient of assist cylinder, frequency response of servo proportional valve, dead zone and hysteresis of servo proportional valve, length of pipe and inner diameter are discussed. The simulation results well confirm the theoretical analysis of the mathematical model, the most important is to provide a reference for the analysis and design of the steering system of the large mining vehicle in the future.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD50

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本文編號：1912738