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  本文選題：高空作業(yè)車　切入點：舉升機(jī)構(gòu)　出處：《重慶交通大學(xué)》2012年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著高空作業(yè)需求的不斷增長，為高空作業(yè)車帶來空前的發(fā)展機(jī)遇。高空作業(yè)車的主要作用是安全、平穩(wěn)地運(yùn)送操作人員和維修器材到達(dá)指定高度位置處進(jìn)行空中作業(yè)。本論文選題來源于重慶市科技攻關(guān)項目“高空作業(yè)車執(zhí)行系統(tǒng)關(guān)鍵技術(shù)及應(yīng)用”（CSTC2009AC6077），通過計算機(jī)仿真的方法模擬了高空作業(yè)車的舉升作業(yè)過程；計算了舉升臂液壓缸的結(jié)構(gòu)參數(shù)并進(jìn)行穩(wěn)定性校核。根據(jù)高空作業(yè)車的作業(yè)特點設(shè)計了舉升臂的液壓回路，并進(jìn)行了AMESim仿真分析。建立了作業(yè)平臺調(diào)平機(jī)構(gòu)的電液數(shù)學(xué)模型，并進(jìn)行了響應(yīng)特性分析。根據(jù)作業(yè)操縱方式的特點，設(shè)計了一種上、下車分布式控制方案。 本課題主要完成了以下研究： （1）建立了折疊臂式高空作業(yè)車舉升臂機(jī)構(gòu)的三維模型，應(yīng)用多體動力學(xué)軟件ADAMS通過分段函數(shù)驅(qū)動的方法模擬了舉升臂的運(yùn)動過程，通過動力學(xué)分析得到了舉升臂機(jī)構(gòu)在額定載荷變幅時執(zhí)行液壓缸的受力情況，由動力學(xué)仿真結(jié)果設(shè)計了執(zhí)行液壓缸的結(jié)構(gòu)參數(shù)，并進(jìn)行了液壓缸穩(wěn)定性校核。 （2）作業(yè)平臺調(diào)平作為高空作業(yè)車的一項關(guān)鍵技術(shù)，其工作的穩(wěn)定性和可靠性對于操作人員的人生安全和操作舒適性有很大的影響。本文設(shè)計了電液比例調(diào)平機(jī)構(gòu)對作業(yè)平臺進(jìn)行控制，為了保證平臺調(diào)平的穩(wěn)定性，建立了電液比例調(diào)平系統(tǒng)的數(shù)學(xué)模型，運(yùn)用經(jīng)典控制理論中的頻域分析方法，，利用Matlab/Simulink對系統(tǒng)的穩(wěn)定性進(jìn)行了分析，仿真結(jié)果得到了最佳的系統(tǒng)開環(huán)放大系數(shù)以保證調(diào)平系統(tǒng)的穩(wěn)定性。 （3）文中設(shè)計了一種具有負(fù)載敏感和壓力補(bǔ)償?shù)呐e升機(jī)構(gòu)液壓回路，該液壓回路可以實現(xiàn)舉升液壓缸的速度不隨負(fù)載的變化而變化，從而保證作業(yè)臂的連續(xù)均勻變幅。采用AMESim軟件對舉升執(zhí)行機(jī)構(gòu)液壓系統(tǒng)進(jìn)行了仿真分析，仿真結(jié)果表明當(dāng)采用具有壓力補(bǔ)償功能的換向閥時，變幅液壓缸的速度能夠維持穩(wěn)定，系統(tǒng)的響應(yīng)速度得到提高，使變幅動作均勻，有利于提高變幅的安全性和作業(yè)人員的舒適性。 （4）為了實現(xiàn)上、下車的分布控制，本文設(shè)計了一種基于CAN總線的分布式控制器，控制器分別位于下車的轉(zhuǎn)臺操作柜和上車的作業(yè)斗操作平臺，這對提高作業(yè)效率和作業(yè)時的安全性具有重要的意義。
[Abstract]:With the increasing demand for aerial work, it brings unprecedented opportunities for the development of aerial vehicles. The main role of aerial vehicles is safety, The topic of this thesis is from the key technology and application of aerial work vehicle execution system of Chongqing science and technology research project "CSTC2009AC6077", through computer. The method of simulation simulates the lifting operation process of aerial work vehicle. The structural parameters of the lifting arm hydraulic cylinder are calculated and the stability is checked. The hydraulic circuit of the lifting arm is designed according to the operating characteristics of the aerial work vehicle, and the AMESim simulation analysis is carried out. The electro-hydraulic mathematical model of the leveling mechanism of the working platform is established. According to the characteristics of operation control mode, a distributed control scheme is designed. This subject mainly completed the following research:. In this paper, a three-dimensional model of lifting arm mechanism of folding arm aerial work vehicle is established, and the motion process of lift arm is simulated by using multi-body dynamics software ADAMS, which is driven by piecewise function. Through the dynamic analysis, the stress of the lifting arm mechanism is obtained when the rated load changes. The structural parameters of the hydraulic cylinder are designed by the dynamic simulation results, and the stability of the hydraulic cylinder is checked. Operation platform leveling as a key technology of aerial vehicle, The stability and reliability of its work have a great influence on the safety and comfort of the operator. In this paper, the electro-hydraulic proportional leveling mechanism is designed to control the operating platform, in order to ensure the stability of the platform leveling. The mathematical model of electro-hydraulic proportional leveling system is established, and the stability of the system is analyzed by using the frequency domain analysis method of classical control theory and Matlab/Simulink. The simulation results show that the optimal open-loop magnification factor is obtained to ensure the stability of the leveling system. In this paper, a kind of hydraulic circuit of lifting mechanism with load sensitivity and pressure compensation is designed, which can realize that the speed of lifting hydraulic cylinder does not change with the change of load. AMESim software is used to simulate and analyze the hydraulic system of lifting actuator. The simulation results show that the speed of the variable amplitude hydraulic cylinder can be maintained stable when the directional valve with pressure compensation function is adopted. The response speed of the system is improved, and the amplitude change is uniform, which is helpful to improve the safety and comfort of the operators. In order to realize the distributed control, a distributed controller based on CAN bus is designed in this paper. The controller is located in the turntable operation cabinet and the job hopper operating platform, respectively. It is of great significance to improve the efficiency and safety of work.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TH21

【引證文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

1 閆東;工程機(jī)械電液轉(zhuǎn)向系統(tǒng)的動態(tài)性能研究[D];蘭州理工大學(xué);2013年

本文編號：1609612