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利用ANSYS软件对重型清障车吊臂进行模态分析,结果表明,该型清障车吊臂的各阶振型主要表现为弯曲和扭曲,会影响清障车起吊作业的稳定性和安全性。主要的外界振源包括:清障车行驶中地面的作用、发动机的作用、吊臂的变幅运动,以及起重作业时提升重物的运动和吊臂的回转。其中,地面激振频率比较复杂,难以找到规律。由于通常情况下发动机的工作转速n的范围在600～8000r/min之间,因此可大致推算出可能对吊臂产生较大影响(共振)的发动机转速n为1740r/min、3950r/min(吊臂全缩状态)和1520r/min、2220r/min(吊臂全伸状态)。实际操作中,应尽量避免在这些转速附近工作。认为共振会导致变幅液压缸处有较大局部变形,设计时,应适当增加变幅液压缸铰接处的强度和刚度,以提高清障车的安全性和稳定性。
The modal analysis of the crane wagon of heavy wrecker using ANSYS software showed that the main modes of the crane wagons were mainly bending and twisting, which would affect the stability and safety of crane wrecker . The main sources of external vibration include: the role of the wrecker on the ground during driving, the role of the engine, the luffing movement of the boom and the hoisting movement of heavy objects and the swinging of the boom during lifting operations. Among them, the ground excitation frequency is more complicated, it is difficult to find the law. Since the working speed n of the engine usually ranges from 600 to 8000 rpm, the engine speed n that can greatly affect the boom (resonance) can roughly be estimated as 1740 r / min and 3950 r / min Arm fully contracted state) and 1520r / min, 2220r / min (boom fully extended state). In practice, should try to avoid working around these speeds. It is considered that the resonance will lead to large local deformation at the hydraulic cylinder. When designing, the strength and rigidity of the hinge of the luffing hydraulic cylinder should be appropriately increased to improve the safety and stability of the wrecker.