基于改进的显式算法对叶片模具翻转架的失效调查

FAILURE INVESTIGATION OF BLADE MOULD TURNING BRACKET BASED ON IMPROVED EXPLICIT ALGORITHM

为对风电叶片模具翻转架进行失效调查,使用改进的显式接触算法对翻转座进行仿真分析。首先,对翻转架进行受力计算,选中6支座中的危险部件进行实体有限元建模。模型中,基于经典显式动力学算法使用重心位置映射的方法对网格单元的间隙变量进行改进,并据此进行网格仿真,最后得到翻转座受力云图。结果显示:施加在液压缸推杆的交变载荷诱发了推杆中部的断裂,且改进算法进一步减少了单元聂动,在计算稳定性上提高13%,计算次数提高6%,为大型部件的接触计算提供理论与应用借鉴。

In order to investigate the failure mechanism of the wind turbine blade mold turning bracket,the improved explicit contact algorithm was used to simulate the turning seat. Firstly,the force of turning bracket is calculated,and the dangerous parts in 6 turning seat are selected for FE modeling using solid elements. In the model,based on the classical explicit dynamic algorithm,the gap variable of the element is improved by the method of barycenter position mapping,and then the simulation is carried out. Finally,the stress nephogram of the turning seat is obtained. The results show that the alternating load applied on the push rod of hydraulic cylinder induces the fracture of the push rod in its middle,and the improved algorithm further reduces the element disturbance. The calculation stability is increased by 13% and the calculation times are increased by 6%. It provides a theoretical and practical reference for the contact calculation of large parts.