基于ADAMS刚柔耦合模型的塔式起重机起重臂疲劳寿命分析

Fatigue life analysis of tower crane boom based on ADAMS rigid flexible coupling model

为了确保塔式起重机的施工安全,延长塔式起重机的使用寿命,对塔式起重机起重臂的疲劳寿命进行了评估研究。首先,以某型号塔式起重机为研究对象,利用SolidWorks进行了三维建模,分析了该塔式起重机的典型工况,采用基于Workbench的塔式起重机静力学分析结果,确定了塔式起重机的应力最大位置;然后,用ANSYS APDL联合ADAMS进行了刚柔耦合动力学仿真,得到了该工况下工作循环的载荷谱;最后,利用NCODE Design Life的“疲劳五框图”对该工况下的塔式起重机进行了疲劳分析。研究结果表明:最易发生疲劳失效的位置在第6节起重臂上弦杆与外连杆的连接位置附近;可得到该工况下塔式起重机起重臂每次循环损伤的最大值为3.598×10^(-6),最小循环次数为2.799×10^(5),满足塔式起重机设计要求,为在役塔式起重机的疲劳寿命评估和塔式起重机的设计提供参考价值,可作为对塔式起重机进行维修和更换零件的依据。

In order to ensure the safety of tower crane construction and prolong the service life of tower crane,the fatigue life of tower crane was evaluated.Firstly,taking a certain type of tower crane as the research object,SolidWorks was used to conduct three-dimensional modeling,the typical working conditions of the tower crane were analyzed.The Workbench was used to determine the maximum stress position of the tower crane s static analysis results.Then ANSYS APDL was combined with ADAMS to conduct rigid-flexible coupling dynamics simulation,and the load spectrum of the working cycle under the working conditions was obtained.Finally,the fatigue five-block diagram of NCODE Design Life was used to analyze the fatigue of tower crane under this working condition.The results show that the most frequent fatigue failure location is near the connecting position between the upper chord of the sixth crane and the outer connecting rod,and the maximum damage of each cycle of the tower crane lifting arm is 3.598×10^(-6) and the minimum number of cycles is 2.799×10^(5) under this working condition,which meets the design requirements of the tower crane.It provides reference value for fatigue life evaluation and design of tower crane in service,and can be used as the basis for maintenance and replacement of tower crane parts.