排涝抢险车举升推展伸缩机构可靠性分析

Analysis on Reliability of Lifting and Extension Mechanism of Large Flow Drainage Emergency Vehicles

针对某大流量排涝抢险车举升推展伸缩机构,应用Solidworks Simulation软件建立有限元模型,得到排涝抢险车举升推展伸缩机构在2种不同极限工况位置下的静态应力分布情况,确认该机构应力最大值出现在工作极限状态下;根据疲劳强度损伤理论,评估分析了举升推展伸缩机构工作极限状态的疲劳特性和可靠性。结果表明,除了个别奇异点外,该机构工作极限状态下各单元节点的最大应力值均小于材料的屈服强度,单元的疲劳损伤百分比也都低于5%,整个机构的疲劳强度能够满足使用要求。对其他同类抢险车的设计、检验及安全评估具有一定的参考价值。

Aiming at the lifting extension mechanism of a large flow drainage emergency vehicle, the finite element model of the mechanism is established by using Solidworks Simulation software, and the static stress distribution of the lifting extension mechanism of the drainage emergency vehicle under two different extreme working conditions is obtained, and it is confirmed that the maximum stress of the mechanism comes under the working limit state. According to the theory of fatigue strength damage,this paper evaluates and analyzes the fatigue characteristics and reliability of the lifting extension mechanism under the working limit state. The results show that,except for a few singular points, the maximum stress value of the mechanism in the working limit state is less than the yield strength of the material and the percentage of the damage for each unit is also less than 5%. This paper can provide reference for the design, inspection and safety evaluation of other similar emergency vehicles.