大吨位电动轮自卸车振动和应力测试与分析

发布时间：2018-03-14 11:33

本文选题：矿用自卸车　切入点：振动测试　出处：《湖南科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：矿用电动轮自卸车整车及关键零部件的振动、应力特性,是其重要特性之一。振动特性关系到自卸车的行驶平顺性、驾驶室舒适性、发动机-动力总成系统减振、前后悬挂减振性的性能的好坏。其所受的应力特性,关系到被测构件的强度和刚度、使用寿命、结构的合理性等。开展矿用电动轮自卸车整车及关键零部件的振动、应力测试与分析,对掌握自卸车的运行状况、提高其运行效率,以及后续的结构优化改进等,均具重要意义。论文开展的主要工作包括以下两个方面:1.矿用电动轮自卸车整车及关键零部件振动测试与分析。开展了矿用电动轮自卸车整车及关键零部件振动测试方案设计,包括测点布置、测试工况的选择、测试仪器的扩容等。利用BK振动测试系统,对电动轮自卸车驾驶室、前后悬挂、发动机-动力总成及液压系统等部件在43种工况下的振动响应进行了测试分析。利用座椅处测得的信号的均方根值、功率谱密度,根据ISO2631对驾驶室的振动舒适性进行了客观评价,结果显示,在某些工况下,驾驶室的振动舒适性有待提高;通过减振性的“加速度识别法”对发动机-动力总成系统以及前悬挂系统的减振性能分析,得出动力总成的橡胶减振垫具有良好的减振性能,悬挂系统亦起到了一定的减振作用。2.矿用电动轮自卸车关键零部件应力测试与分析。开展了矿用电动轮自卸车整车及关键零部件应力测试方案设计,包括测点布置、测试工况的选择、应力测试方法的选择、应力测试桥路的搭建等。利用Synergy高速数据采集系统,对后桥及车架在共23种工况下的动应力进行了测试与分析。通过对应力峰值分析,获取应力分布情况及应力极大值所对应的工况。分析结果显示在车辆在凹凸路面、转弯行驶和启动-加速到最高速时受到的应力很大。分析结果可为其强度、刚度、使用寿命分析评价提供参考和依据。
[Abstract]:The vibration and stress characteristics of the whole truck and its key parts are one of its important characteristics. The vibration characteristics are related to the ride comfort of the dump truck, the comfort of the cab, and the vibration reduction of the powertrain system. The performance of front and rear suspension vibration absorption is good or bad. The stress characteristic is related to the strength and rigidity, service life, rationality of structure, etc. The vibration of the whole truck and key parts of mine electric wheel dump truck is carried out. The stress test and analysis can improve the running efficiency of the dump truck, improve the operation efficiency, and improve the structure of the dump truck. The main work of this paper includes the following two aspects: 1. Vibration test and analysis of the whole truck and key parts of the mine electric wheel dump truck. The design of vibration test scheme for the whole truck and key parts of the electric wheel dump truck used in the mine has been carried out. Including the layout of measuring points, the selection of test conditions, the expansion of test instruments, etc. By using the BK vibration test system, the cab of the electric wheel dump truck, the front and rear suspension, The vibration response of engine-power assembly and hydraulic system is tested and analyzed under 43 working conditions. The root mean square value, power spectral density of the signals measured in the seat are used. According to ISO2631, the vibration comfort of cab is evaluated objectively. The results show that the vibration comfort of cab needs to be improved under some working conditions. Through the analysis of the vibration absorption performance of the engine power assembly system and the front suspension system by "acceleration identification method", it is concluded that the rubber damping pad of the power assembly has good vibration absorption performance. The suspension system also plays a certain role in reducing vibration. 2. Stress test and analysis of the key parts of the mine electric wheel dump truck. The design of the whole truck and the key parts stress test scheme of the mining electric wheel dump truck is carried out, including the layout of the measuring points. The selection of test conditions, the selection of stress test methods, the construction of stress test bridges, etc. The dynamic stress of rear axle and frame under 23 working conditions is tested and analyzed by using Synergy high-speed data acquisition system. The results of the analysis show that the stress is very large when the vehicle is on the concave and convex road, turn and start-accelerate to the highest speed. The result of the analysis can be its strength, stiffness, etc. Service life analysis and evaluation to provide a reference and basis.
【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD634

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