PT25型高空作业平台支腿动态仿真与折臂机构铰点优化

发布时间：2019-04-23 11:06

【摘要】：PT25型高空作业平台的支腿在工作过程支撑着整机，同时，在长距离运输时承担着自行上下车运输的任务，其受力和运动状态将影响到整机工作稳定性和上下车安全性；折臂机构承载着吊篮和工作人员，其变幅机构铰点位置的布置直接影响折臂油缸受力，进而影响整机的作业稳定性和可靠性。为此，对支腿和折臂机构进行分析和优化，对于改善高空作业平台整机性能有着重要的意义。本文借助Pro/E、ANSYS和ADAMS等软件，建立了该平台的虚拟样机模型，分析了不同工况下支腿受力和运动规律，并对折臂机构的铰点位置进行了优化，，主要研究内容如下： 1、应用Pro/E软件分别建立高空作业平台自行上车过程和作业过程的三维模型，将建立好的模型导入ADAMS仿真环境，施加适当的约束与驱动后进行仿真分析，获得两种工作过程下的支腿各构件的运动学和动力学参数及其变化规律。 2、借助ANSYS软件生成支腿零部件的模态中性文件MNF(ModalNeutral File)，并将其导入ADAMS替代刚体构件，建立考虑支腿弹性变形的刚柔耦合模型，进而对整机自行上车过程和作业过程进行刚柔耦合动力学仿真计算，获得刚柔耦合模型的力、应力等随时间的变化曲线，并将获得的曲线与刚体模型曲线进行对比分析。 3、在ADAMS环境下建立折臂机构可参数化的模型，通过软件自身的优化功能对该机构的铰点位置进行优化设计，获得了更加合理的折臂机构设计参数。通过对高空作业平台虚拟样机刚体模型和刚柔耦合模型的分析可知，把构件自身的弹性、阻尼、惯性等因素考虑进来的刚柔耦合仿真更加接近实际；分析折臂机构铰点位置的优化结果发现，优化后的该机构在一定程度上改善了折臂油缸受力，提高了系统的起动稳定性和工作可靠性。
[Abstract]:The legs of PT25 high-altitude working platform support the whole machine in the working process, at the same time, it takes on the task of self-loading and getting-off transportation in the long distance transportation, and its force and motion state will affect the whole machine's working stability and the safety of getting on and off the train. The folding arm mechanism carries the hanging basket and the staff, and the layout of the hinge point position of the amplitude changing mechanism directly affects the force of the folding arm oil cylinder, and then affects the stability and reliability of the whole machine. Therefore, the analysis and optimization of leg and folding arm mechanism is of great significance to improve the performance of the platform. In this paper, the virtual prototype model of the platform is established with the help of software such as Pro/E,ANSYS and ADAMS, and the force and movement law of the leg under different working conditions are analyzed, and the hinge position of the folding arm mechanism is optimized. The main research contents are as follows: 1, The three-dimensional models of the self-loading process and the working process of the platform are established by using Pro/E software. The established model is imported into the ADAMS simulation environment, and the simulation analysis is carried out after applying the appropriate constraints and driving. The kinematic and dynamic parameters and their changing rules of each member of the leg under two kinds of working process are obtained. 2, the model neutral file MNF (ModalNeutral File), of leg component is generated by ANSYS software and imported into ADAMS instead of rigid body component, and the rigid-flexible coupling model considering elastic deformation of leg is established. Then, the dynamic simulation of rigid-flexible coupling process is carried out to get the curve of force and stress of rigid-flexible coupling model with time, and the curve is compared with the curve of rigid body model. 3. The parameterized model of the folding arm mechanism is established under the environment of ADAMS, and the hinge position of the mechanism is optimized by the optimization function of the software itself, and more reasonable design parameters of the folding arm mechanism are obtained. Through the analysis of rigid body model and rigid-flexible coupling model of virtual prototype of aerial platform, it is known that the rigid-flexible coupling simulation which takes the elasticity, damping, inertia and other factors into account is closer to the reality. By analyzing the optimization results of the hinge point position of the folding arm mechanism, it is found that the optimized mechanism improves the bearing force of the folding arm oil cylinder to a certain extent, and improves the starting stability and working reliability of the system.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH211.6

【参考文献】