本文選題：輪式起重機(jī) + 多軸轉(zhuǎn)向��； 參考：《太原科技大學(xué)》2014年碩士論文

【摘要】：隨著社會(huì)的進(jìn)步、國(guó)民經(jīng)濟(jì)的快速發(fā)展，大型輪式起重機(jī)在核電、橋梁、高鐵等各大工程項(xiàng)目中得到了廣泛的應(yīng)用，并逐步向智動(dòng)化高水平方向發(fā)展。大型輪式起重機(jī)具有軸數(shù)多、承載能力大、運(yùn)輸效率高等的優(yōu)點(diǎn)，但軸數(shù)的增多給大型輪式起重機(jī)在低速時(shí)的轉(zhuǎn)彎和高速時(shí)的穩(wěn)定性都帶來(lái)了困難,同時(shí)轉(zhuǎn)向系統(tǒng)性能的優(yōu)劣又會(huì)影響到大型輪式起重機(jī)燃油的經(jīng)濟(jì)性和行駛安全性，因此對(duì)大型輪式起重機(jī)的轉(zhuǎn)向特性功能的研究具有重要的現(xiàn)實(shí)意義。 本文首先對(duì)多軸轉(zhuǎn)向系的轉(zhuǎn)向方式和結(jié)構(gòu)組成進(jìn)行了比較，然后按照所要實(shí)現(xiàn)的轉(zhuǎn)向模式選擇了前橋組（前五軸）轉(zhuǎn)向?yàn)闄C(jī)械式、后橋組（后四軸）采用電子控制液壓系統(tǒng)的轉(zhuǎn)向方式，這種轉(zhuǎn)向方式可以保證轉(zhuǎn)向時(shí)的可靠性和靈活性。 其次，對(duì)大型輪式起重機(jī)的轉(zhuǎn)向系統(tǒng)簡(jiǎn)化，根據(jù)汽車?yán)碚撏茖?dǎo)出其運(yùn)動(dòng)微分關(guān)系式，通過(guò)Matlab編程和Simulink模塊分析了其在零質(zhì)心側(cè)偏角控制算法條件下的轉(zhuǎn)向動(dòng)態(tài)特性，并且對(duì)比分析了不同的質(zhì)心的位置和不同的輪胎側(cè)偏剛度對(duì)轉(zhuǎn)向特性的影響。 接著，運(yùn)用經(jīng)驗(yàn)公式分析了轉(zhuǎn)向阻力矩，并初步選取了液壓缸的主要參數(shù)。 最后，，在對(duì)轉(zhuǎn)向執(zhí)行機(jī)構(gòu)進(jìn)行簡(jiǎn)化的基礎(chǔ)上建立了其數(shù)學(xué)模型，通過(guò)Bode圖對(duì)單個(gè)液壓助力轉(zhuǎn)向橋的穩(wěn)定性進(jìn)行分析，并運(yùn)用Matlab/Simulink和AMESim對(duì)該轉(zhuǎn)向系統(tǒng)中的單個(gè)轉(zhuǎn)向橋進(jìn)行建模和對(duì)轉(zhuǎn)向盤(pán)在角階躍輸入信號(hào)的激勵(lì)下進(jìn)行動(dòng)態(tài)響應(yīng)特性仿真分析。通過(guò)對(duì)單橋轉(zhuǎn)向系統(tǒng)的快速響應(yīng)特性和穩(wěn)定性的模擬研究為多橋轉(zhuǎn)向系統(tǒng)的研究提供借鑒。
[Abstract]:With the progress of the society and the rapid development of the national economy, large wheeled cranes have been widely used in nuclear power, bridges, high-speed rail and other major projects, and gradually developed to a high level of intelligence. Large wheeled cranes have many advantages, such as many shafts, large load-carrying capacity and high transportation efficiency, but the increase of shaft numbers brings difficulties to the turning of large wheeled cranes at low speed and stability at high speed. At the same time, the performance of steering system will affect the fuel economy and driving safety of large wheeled crane, so it is of great practical significance to study the steering characteristics of large wheeled crane. In this paper, the steering mode and structure composition of the multi-axis steering system are compared, and then the front axle group (the first five axes) steering is chosen as the mechanical type according to the steering mode to be realized. The rear axle group (rear four axis) adopts the electronic control hydraulic system steering mode, this kind of steering mode can guarantee the reliability and flexibility of steering. Secondly, the steering system of the large wheeled crane is simplified, and the differential equation of its motion is deduced according to the automobile theory. The dynamic characteristics of the steering system under the condition of zero-centroid side deflection control algorithm are analyzed by Matlab programming and Simulink module. The effects of different centroid positions and different tire lateral stiffness on steering characteristics are analyzed. Then, the steering resistance moment is analyzed by empirical formula, and the main parameters of hydraulic cylinder are preliminarily selected. Finally, based on the simplification of steering actuator, the mathematical model is established, and the stability of single hydraulic steering axle is analyzed by Bode diagram. Using Matlab / Simulink and AMESim to model a single steering bridge in the steering system and to simulate the dynamic response characteristics of the steering wheel under the excitation of the angular step input signal. The simulation study on the fast response characteristics and stability of single axle steering system provides a reference for the study of multi-axle steering system.
【學(xué)位授予單位】：太原科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TH213.6

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