高承载能力减速器温度场及散热系数的研究

【作者】 李旭红；

【导师】 刘凯；

【作者基本信息】 西安理工大学 ， 机械设计及理论， 2000， 硕士

【摘要】 本文利用传热学原理和机械学知识分析重载减速器内部热源的种类和传热途径，建立了传热学物理模型;根据减速器的几何形状，建立三维数学模型；确定了稳态热传导控制方程和相应的边界条件方程，推导了减速器温度场方程的泛函；用复合平壁导热的公式和有限元方法计算减速器的温度场分布和散热系数。根据实际工况提出了作为对流换热边界条件的箱体内外空气的对流换热系数的计算方法；计算随输入功率和转速变化的箱体内部热流密度输入和消耗功率；确定作为温度己知边界的箱体底部温度常数。结合上述理论编制了相应的计算程序，计算了不同工况下减速器的温度场分布、润滑油的平均温度和减速器散热系数，并对计算结果进行了分析比较。 研究结果表明：用有限元方法和复合平壁传热来确定减速器散热系数可以满足工程实际的需要。减速器散热系数和润滑油温度受到减速器传递功率、环境温度和转速的影响，其中受传递功率影响最大，而转速影响最小。减速器温度场是以热流输入的边界为中心向四周扩散，每一层面的温度均匀并且逐层递减，箱体底部的温度受环境温度影响最小。更多还原

【Abstract】 In this paper, heavy-duty reducer internal heat sources and heat transmissionways are analyzed and heat transfer model is given using heat transfer theory andmechanics knowledge. Three-dimensional mathematical model is constructed basedon reducer geometry;steady-state heat conduction governing equation and boundarycondition are made and reducer temperature field functional are deduced,temperature field and heat transfer coefficient are calculated using multiple plateheat-conducting formula and finite element method(FEM). Method calculating heattransfer coefficient at the inside and outside are presented in according with workingcondition,heat fluxes and consumed power changing with power and revolution inthe reducer are calculated; temperature constant at the bottom of gear box isdetermined. The corresponding computer program is developed for all thecalculation. The temperature field, average temperature of lubricating oil and heatrelease coefficient are obtained and analyzed.The study results show that reducer heat release coefficient can satisfy theengineering need using FEM and multiply plate conduction. The heat releasecoefficient and oil temperature are influenced mostly by power, next byenvironmental temperature and slightly by evolution. The temperature filed diffusesin the center of heat resource and decreases evenly;the bottom temperature isaffected slightly.更多还原