Dynamic Simulation and Optimization of Vehicle-Mounted Multifunctional Mechan-Ical Arm 2023-01-0772

The multi-functional mechanical arm equipped on engineering vehicle can achieve different functions by installing different mechanism devices through the interface at the end of the mechanical arm. It can achieve functions like engineering construction and road rescue. Mechanical arm systems often work in complex environments, which requires good reliability and safety of the boom system.

When the mechanical boom is working, the pressure of each luffing cylinder is large, and the contact force and acceleration of each boom are complex, which requires a certain degree of verification and optimization before it can be put into production. In this paper, a virtual prototype of a vehicle mounted hydraulic mechanical arm with four booms is established. Through ADAMS, the dynamic analysis of mechanical arm under multiple working conditions is carried out, the movement parameter changes and the pressure changes of each luffing cylinder are analyzed. A multi working condition optimization scheme is proposed to parameterize the coordinates of each hinge point of the mechanical boom. Through sensitivity analysis, the parameters of articulation points that have great influence on the force of the boom system are obtained for optimal design, so as to minimize the maximum pressure of each cylinder and improve its working condition.

The maximum pressure of each cylinder of the optimized mechanical arm is reduced by 20% - 50% compared with baseline, and the force curve becomes more gentle, eliminating the sudden change of pressure, which makes the dynamic characteristics of the mechanical arm significantly improved, makes its lightweight design more possible, shortens the deployment speed of its boom, and increases the working efficiency and reliability of the engineering vehicle, This provides a reference for the design of other kinds of mechanical arms.