In view of the braking process for megawatt wind turbine brakes and considering the effects that the width of brake friction area and linear velocity radial difference,the gradient of velocities circulation method is put forward,and the thermal-structure for the brake in braking process is analyzed. First,the model of three dimensional transient heat transfers for brake friction pair is build based on ANSYS. Then heat flowing density is loaded by the gradient of velocities circulation method. At last,geometrical parameters are determined,and the loading function of heat flowing density is plugged. The result of temperature field analysis in the disc brake friction slice of temperature radius direction presents a radian obvious temperature zone. Direction of in-creased temperature gradient along the radius size is reduced. Using gradient of velocities circulation method integrated the results of thermal analysis generation into the structure under coupling analysis of force and de-formation analysis of brake friction slice,wear condition can be forecasted. Compared with traditional uniform loading method using the analysis of the velocity gradient method is closer to the actual results. The analysis method provides the reference for simulation of the large size disc brake friction braking condition process.%针对大兆瓦风电制动器制动过程,考虑制动摩擦副作用区域宽度及其影响下的线速度径向差异,提出速度梯度循环法,对制动过程摩擦副进行热-结构耦合分析.基于ANSYS软件建立制动器摩擦副三维瞬态传热有限元模型,运用速度梯度循环法推导出热流密度的加载式,用以计算制动过程中产生的摩擦热流,对制动区域温度场进行数值模拟.从分析结果表明制动闸片摩擦区域温度分布在制动盘径向呈现弧度明显的等温分布,温度梯度随半径增大而增大.以速度梯度循环法将热分析结果代入结构场对闸片摩擦区域受力及变形进行耦合分析并预估其磨损状况.通过与传统均匀加载方法对比发现使用速度梯度循环法的分析结果与实际更为接近.所提出的分析方法为模拟大尺寸盘式制动器的摩擦制动过程提供参考.
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