本文選題：推土機 + 液壓驅(qū)動��； 參考：《哈爾濱工程大學(xué)》2014年碩士論文

【摘要】：隨著當(dāng)今工程機械行業(yè)的快速發(fā)展,以推土機為代表的工程車輛的各項性能已有了大幅的提高,但整車的能量損失大,經(jīng)濟性不高及作業(yè)效率低等問題仍是困擾該行業(yè)進一步發(fā)展的主要問題,而車輛的行走驅(qū)動系統(tǒng)的性能的好壞是影響該問題的關(guān)鍵因素。液壓傳動系統(tǒng)以其獨有的特性和優(yōu)點受到了工程機械行業(yè)的青睞。目前,比較先進的推土機等工程車輛中大都采用全液壓行走驅(qū)動系統(tǒng)。一個系統(tǒng)中綜合性能的好壞與各元件自身性能,元件間參數(shù)匹配的好壞及控制策略的優(yōu)劣有關(guān)。在傳統(tǒng)的液壓行走驅(qū)動系統(tǒng)的控制方式中,往往采用單一變量的控制,而忽略了元件間的匹配問題,導(dǎo)致系統(tǒng)不能發(fā)揮出其最優(yōu)性能,為了有效地解決該問題,本文提出了將柴油機轉(zhuǎn)速、泵排量和馬達排量聯(lián)合控制的三變量控制策略,即在考慮各元件間能良好匹配,各元件的效率能得到充分發(fā)揮的情況下而得出的控制方法。本文分析了變量泵、變量馬達的效率及壽命的影響因素,綜合考慮后得出系統(tǒng)參數(shù)最佳取值范圍。在以提高系統(tǒng)的效率和功率利用率為目的的基礎(chǔ)上,針對推土機的工作特點提出了元件間最佳匹配方式。以搭建的液壓系統(tǒng)實驗臺為原型,采用Simulink仿真軟件下的Simscape元件庫建立了液壓系統(tǒng)仿真模型,并與柴油機整機仿真模型和控制系統(tǒng)模型構(gòu)成了液壓動力驅(qū)動系統(tǒng)整體模型。將泵排量、馬達排量和負載扭矩作為特性參數(shù),在其取值范圍內(nèi)取七個水平,將系統(tǒng)壓力和馬達轉(zhuǎn)速作為目標(biāo)觀測值,采用實驗設(shè)計法進行實驗分組,對特性因子與目標(biāo)觀測值之間做相關(guān)性分析,并建立了在全工況下系統(tǒng)壓力和馬達轉(zhuǎn)速的響應(yīng)面模型,并對其進行評價和驗證,最后對響應(yīng)面模型進行分析。根據(jù)元件間的匹配方法及系統(tǒng)壓力和馬達轉(zhuǎn)速的響應(yīng)面模型,提出了各作業(yè)工況下三變量控制策略的具體控制方法,然后進行仿真分析和試驗驗證,最終得出了該控制策略能夠使系統(tǒng)穩(wěn)定工作在最優(yōu)點,且系統(tǒng)效率有所提高的結(jié)論。
[Abstract]:With the rapid development of construction machinery industry, the performance of engineering vehicles, represented by bulldozers, has been greatly improved, but the energy loss of the whole vehicle is large. The problems of low economy and low working efficiency are still the main problems that haunt the further development of the industry, and the performance of the vehicle driving system is the key factor affecting the problem. Hydraulic transmission system is favored by the construction machinery industry for its unique characteristics and advantages. At present, more advanced bulldozers and other engineering vehicles mostly use full hydraulic driving system. The comprehensive performance of a system is related to the performance of each component, the matching of parameters between components and the quality of control strategy. In the traditional control mode of hydraulic driving system, single variable control is often adopted, but the matching problem between components is ignored, which results in the system unable to give full play to its optimal performance, in order to solve this problem effectively. In this paper, a three-variable control strategy for diesel engine speed, pump displacement and motor displacement is proposed, that is, the control method is obtained by considering the good match between the components and the full play of the efficiency of each component. In this paper, the factors affecting the efficiency and life of variable pump and variable motor are analyzed, and the optimum range of system parameters is obtained. Based on the purpose of improving the efficiency and power efficiency of the system, the optimal matching method among the elements is proposed according to the working characteristics of the bulldozer. The hydraulic system simulation model is established by using the Simscape component library under the Simulink simulation software, and the whole hydraulic power drive system model is constructed with the diesel engine simulation model and the control system model. Taking pump displacement, motor displacement and load torque as characteristic parameters, taking seven levels within the range of their values, the system pressure and motor speed are taken as the target observation values, and the experimental design method is used to group the experiments. The correlation between the characteristic factor and the target observation value is analyzed, and the response surface model of the system pressure and motor speed under the whole operating condition is established, and the response surface model is evaluated and verified. Finally, the response surface model is analyzed. According to the matching method between components and the response surface model of system pressure and motor speed, the specific control method of three-variable control strategy under various operating conditions is put forward, and then the simulation analysis and experimental verification are carried out. Finally, it is concluded that the control strategy can make the system work stably and improve the system efficiency.
【學(xué)位授予單位】：哈爾濱工程大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU623.5

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