登高平台消防车曲臂连杆的铰点优化及强度分析

Hinge Joint Optimization And Strength Analysis of Linkage Mechanism of Boom for Platform Fire Fighting Vehicle

连杆机构铰点位置与连杆的力学性能有着直接关联。对登高平台消防车的曲臂变幅常见四连杆机构的铰点布置进行了力学分析,建立了数学模型,以油缸的最小推力为目标函数,详细分析了各种铰点布置的约束条件,并编制了相应的铰点优化计算程序,应用遗传算法进行求解。优化结果表明:最优化设计可使油缸最大推力减小15.6%。同时,利用应力试验和ANSYS有限元软件进行强度校核与分析,分析结果表明:经过铰点优化后的连杆机构各铰点处的应力均有所降低。该优化方案可使臂架变幅连杆机构铰点布置最合理且力学性能得到提升,具有较大的工程实际应用价值。

There is a direct relationship between hinge position and mechanical properties of linkage.Based on the analysis of hinge point arrangement of common four linkage mechanism of crank arm luffing of platform fire fighting vehicle,a mathematical model is established.Taking the minimum thrust of the oil cylinder as the objective function,the constraint conditions of various hinge point arrangements are analyzed in detail,and the corresponding hinge point optimization calculation program is developed,which is solved by genetic algorithm,The optimization results show that the maximum thrust of cylinder can be reduced by 15.6%by the optimization design.At the same time,Stress test experiment and ANSYS finite element software is used to check and analyze the strength.The results show that the stress at each hinge point of the linkage mechanism is reduced after optimization of the hinge point.This optimization scheme can make hinge point layout of the luffing link mechanism of boom most reasonable and improve the mechanical properties,which has great engineering practical value.