本文關(guān)鍵詞：50型裝載機(jī)鉸接轉(zhuǎn)向特性分析　出處：《吉林大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 鉸接轉(zhuǎn)向 動力學(xué)分析 轉(zhuǎn)向液壓系統(tǒng) 能耗

【摘要】：目前對于輪式裝載機(jī)轉(zhuǎn)向系統(tǒng)的研究相對較少,輪式裝載機(jī)的轉(zhuǎn)向行駛要比直線行駛情況復(fù)雜得多,轉(zhuǎn)向時輪胎與地面之間會產(chǎn)生較大的滑動,對裝載機(jī)的使用壽命和轉(zhuǎn)向性能都產(chǎn)生較大的影響。鉸接式裝載機(jī)作為耗能嚴(yán)重的工程車輛,轉(zhuǎn)向液壓系統(tǒng)的能量損耗較大,如何降低能耗提高轉(zhuǎn)向效率已成為輪式裝載機(jī)研究重點(diǎn)之一。本文以50型裝載機(jī)為研究對象,對鉸接式裝載機(jī)轉(zhuǎn)向系統(tǒng)的動力學(xué)和液壓轉(zhuǎn)向特性進(jìn)行分析,全文主要內(nèi)容如下:首先,對裝載機(jī)轉(zhuǎn)向特性的研究背景和意義進(jìn)行介紹,綜述國內(nèi)外對于轉(zhuǎn)向動力學(xué)和轉(zhuǎn)向液壓系統(tǒng)的研究現(xiàn)狀,介紹輪式裝載機(jī)鉸接式轉(zhuǎn)向系統(tǒng)的機(jī)構(gòu)特性和運(yùn)動原理,對轉(zhuǎn)向的運(yùn)動學(xué)和動力學(xué)模型進(jìn)行分析,計(jì)算轉(zhuǎn)向液壓缸壓力,為仿真分析奠定理論基礎(chǔ)。其次,根據(jù)50型裝載機(jī)的尺寸參數(shù)和約束條件,建立裝載機(jī)整車虛擬樣機(jī)模型,對空載和滿載兩種狀態(tài)下進(jìn)行轉(zhuǎn)向特性的動力學(xué)分析,得到轉(zhuǎn)向過程中各個輪胎的載荷特性,分別討論轉(zhuǎn)向角、行駛速度和轉(zhuǎn)向快慢對轉(zhuǎn)向特性的影響。再次,通過對轉(zhuǎn)向液壓系統(tǒng)中優(yōu)先閥和轉(zhuǎn)向器原理的分析,建立轉(zhuǎn)向液壓系統(tǒng)模型,并與轉(zhuǎn)向機(jī)構(gòu)進(jìn)行機(jī)械-液壓聯(lián)合仿真分析,研究方向盤轉(zhuǎn)速和外載荷大小對行駛轉(zhuǎn)向特性的影響,分析轉(zhuǎn)向液壓系統(tǒng)中壓力、流量等特性參數(shù),并進(jìn)行能耗和轉(zhuǎn)向效率的分析,通過與試驗(yàn)結(jié)果的對比,驗(yàn)證仿真模型的正確性和合理性。提出兩個小排量泵代替定量泵轉(zhuǎn)向的改進(jìn)方案,通過對改進(jìn)轉(zhuǎn)向液壓系統(tǒng)進(jìn)行仿真和能耗分析,證明該方案能夠有效的提高轉(zhuǎn)向效率,降低能耗。最后,以50型裝載機(jī)為試驗(yàn)樣機(jī),對裝載機(jī)轉(zhuǎn)向液壓系統(tǒng)進(jìn)行試驗(yàn)研究,介紹試驗(yàn)原理與步驟,對典型工況的轉(zhuǎn)向工作狀態(tài)進(jìn)行現(xiàn)場實(shí)時測量,得出轉(zhuǎn)向液壓系統(tǒng)轉(zhuǎn)向泵、轉(zhuǎn)向液壓缸壓力的動態(tài)特征,對試驗(yàn)結(jié)果進(jìn)行分析,比較試驗(yàn)數(shù)據(jù)與仿真值的差異。
[Abstract]:The steering system is less on the wheel loader, the wheel loader steering to the situation is more complicated than straight line driving, steering between the tire and the ground will have a larger slide, all have a great influence on the service life of loaders and steering performance. Articulated loader, as a serious energy consuming engineering vehicle, has great energy loss in steering hydraulic system. How to reduce energy consumption and improve steering efficiency has become one of the research focuses of wheeled loaders. The 50 type loader as the research object, the articulated loader steering dynamics and hydraulic system of steering characteristics, the main contents of this paper are as follows: firstly, the steering wheel loader's research background and significance are introduced, summarizes the domestic and foreign research status for steering and steering hydraulic system dynamic characteristics, agencies and the movement principle of wheel loader steering system, kinematics and dynamics of the model to the analysis, calculation of steering hydraulic pressure, which lays the theoretical foundation for simulation analysis. Secondly, according to the size parameters and constraints of type 50 loader, a virtual prototype model of the vehicle loading machine, full of no-load and under two dynamic steering characteristics analysis, load characteristics to each tire in the process, discuss the steering angle, running speed and steering speed of steering characteristic influence. Again, through the analysis of the hydraulic steering system and steering principle of priority valve, a hydraulic steering system model, and analyze the co simulation of mechanical hydraulic steering mechanism, the steering characteristics of steering wheel speed and the influence of load size, analysis of pressure and flow characteristics of the hydraulic system parameters of steering, and energy consumption and efficiency analysis of steering, through the comparison with the experimental results, verify the correctness and rationality of the simulation model. Two improved schemes of small displacement pump instead of quantitative pump are put forward. Through the simulation and energy consumption analysis of the improved steering hydraulic system, it is proved that the scheme can effectively improve the steering efficiency and reduce energy consumption. Finally, the 50 type loader for the experimental prototype, experimental research on hydraulic steering system of loader, introduces the principle and procedure of testing, on-site real-time measurement of steering working condition of typical working conditions, the dynamic characteristics of the hydraulic steering system steering pump, hydraulic pressure, analysis of test results, differences between data and simulation comparative test value.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TH243

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