井下轨道牵引车制动系的设计与仿真分析

发布时间：2018-07-06 08:56

本文选题：凸轮 + 虚拟样机　；参考：《中国矿业大学》2015年硕士论文

【摘要】：针对现有煤矿井下轨道牵引机车制动系统存在的反应时间慢、空程距离长、制动能力差等问题,本文提出了一种空间凸轮连杆机构结合鼓式制动器的机械式制动方案。通过建立虚拟样机的方法,对制动系统进行制动性能的动力学仿真;同时,采用有限元分析法对制动系统重要部件——制动鼓进行接触分析。在分析现有机械制动结构的基础上,结合空间凸轮机构高效、轻便的优点,合理设计凸轮轮廓曲线,正确布置连杆位置,得到凸轮连杆机构,进行制动力的传递,并采用领从蹄式鼓式制动器作为制动执行机构,对整车制动。利用虚拟样机技术对制动系建模,并用ADAMS软件对制动系进行制动性能的动力学仿真得到制动过程中作用力、制动力矩等动力学参数及反映制动性能的制动时间、制动距离等参数。将实际仿真结果与理论分析结果进行对比验证,两者误差在8%的误差范围内,且制动距离、制动时间等参数均符合《煤矿安全章程》的规定,证明了虚拟样机模型仿真的正确性与可行性。通过有限元分析软件ANSYS/Workbench对制动鼓进行接触分析。采用预加载的方法式,得到领、从蹄的实际制动效能因数;并分析实际作用力下制动器各部件的应力情况以及接触应力分布规律。制动器各部件的应力分布表征其结构强度符合要求;接触压力分布规律与现有余弦分布理论基本一致,验证了接触分析的正确性。针对仿真与理论存在的误差,对制动器结构参数——摩擦初始角进行优化设计,优化后的结果明显更接近理论值,验证了优化设计的可行性、正确性,为以后制动器的设计与优化提供了理论依据。
[Abstract]:Aiming at the problems of low reaction time, long air distance and poor braking ability in the braking system of underground rail tractor in coal mine, a mechanical braking scheme of spatial cam linkage mechanism combined with drum brake is proposed in this paper. The dynamic simulation of braking performance is carried out by establishing virtual prototype, and the contact analysis of brake drum, an important part of braking system, is carried out by using finite element analysis method. On the basis of analyzing the existing mechanical braking structure and combining the advantages of high efficiency and portability of spatial cam mechanism, the cam contour curve is reasonably designed, the position of connecting rod is arranged correctly, the cam linkage mechanism is obtained, and the braking force is transferred. The drum brake is used as brake actuator to brake the whole vehicle. The braking system is modeled by virtual prototyping technology, and the dynamic parameters such as force, braking torque and braking time are obtained by using Adams software to simulate the braking performance of the brake system. Braking distance and other parameters. The actual simulation results are compared with the theoretical analysis results. The error is within the range of 8%, and the parameters such as braking distance and braking time are in accordance with the regulations of Coal Mine Safety regulations. The correctness and feasibility of virtual prototype model simulation are proved. The contact analysis of brake drum is carried out by finite element analysis software ANSYS / Workbench. By using the method of preloading, the actual braking efficiency factor of the collar and the shoe is obtained, and the stress and contact stress distribution of the parts of the brake under the actual force are analyzed. The stress distribution of various parts of the brake shows that the structural strength meets the requirements, and the distribution of contact pressure is basically consistent with the existing cosine distribution theory, which verifies the correctness of the contact analysis. In view of the error between simulation and theory, the optimum design of brake structural parameter-friction initial angle is carried out. The result of optimization is obviously closer to the theoretical value, which verifies the feasibility and correctness of the optimal design. It provides a theoretical basis for the design and optimization of brake.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD524

【参考文献】