基于CEL法的故障齿轮热流固耦合有限元分析

为探究风电机组传动系统中齿轮不同故障热流固耦合下应力演化规律，利用ABAQUS软件,采用CEL有限元法对啮合齿轮进行数值模拟。研究了温度场对齿轮啮合最大接触应力的影响以及热流固耦合下不同损坏程度齿轮在齿宽、齿厚方向最大接触应力值的演化规律。结果表明：引入温度场后不同阶段啮合齿轮的最大接触应力分别增长了20.63%，41.28%，6.13%，说明热力场的介入对应力结果有重要影响；点蚀孔边缘接触应力明显大于正常部位且会扩展，损坏程度越大接触应力值越大；断齿故障在断裂位置接触应力会激增，并且越靠近断裂端接触应力越大且断裂深度越大，最大接触应力也越大；在不同断齿工况下，沿齿厚方向的应力变化趋势一致，断裂程度与齿厚方向上整体应力值呈正相关。CEL有限元法适用于齿轮热流固耦合分析，可以较好地模拟故障齿轮运行状态，为齿轮模拟仿真提供借鉴与指导。

Finite element analysis of fault gear of thermal-fluid-solid coupling based on CEL method

In order to study the stress evolution law of different faults of gears in the transmission system of wind turbine under thermal-fluid-solid coupling, ABAQUS software and CEL finite element method were used to numerically simulate the meshing gear. The influence of temperature field on the maximum contact stress of gear meshing and the evolution law of the maximum contact stress of gears with different damage degrees in the direction of tooth width and tooth thickness under thermal-fluid-solid coupling were studied. The results show that the maximum contact stress of meshing teeth in different stages increases by 2063%, 4128% and 613% respectively after the introduction of temperature field, which shows that the intervention of thermal field has an important influence on the stress results. The contact stress at the edge of the pitting hole is obviously greater than that at the normal position and will expand, and the greater the damage degree is, the greater the contact stress value is; The contact stress of broken teeth will increase sharply at the fracture position, and the closer it is to the fracture end, the greater the contact stress is and the greater the fracture depth is, and the greater the maximum contact stress is. Under different working conditions of broken teeth, the stress change trend along the tooth thickness direction is consistent, and the fracture degree is positively correlated with the overall stress value in the tooth thickness direction. The CEL finite element method is suitable for thermal-fluid-solid coupling analysis of gears, which can better simulate the running state of faulty gears and provide reference and guidance for gear simulation.