基于PCA-TN的直升机主减速器通用热分析计算

针对当前热分析方法无法满足直升机主减速器结构复杂多变的问题,提出了一种快速获取主减速器温度场分布的通用热分析方法。以典型直升机主减速器为样本,进行了主成分分析（principal component analysis,PCA）,并结合热网络法（thermal network,TN）,分析获得3种通用热分析单元体模型。对于不同结构的主减速器,通过单元体及其衍生体的组合可以迅速且有效地建立其系统热分析模型,求解获得温度场分布。以某直升机主减速器为例,应用该方法进行了热分析,并与试验进行了对比,结果表明:该方法能高效计算主减速器的温度场分布,计算值与试验值最大误差为5.07%,满足主减速器热分析工程计算需求。 

General thermal analysis of helicopter gearbox based on PCA-TN

Targeting the problem of current thermal analysis methods which could not meet the complexity and polytropy of structure of helicopter gearbox, a general thermal analysis method which could quickly obtain the temperature distribution of helicopter gearbox was proposed. The combination of thermal network (TN) and principal component analysis (PCA) taking typical helicopter gearboxes as sample drew a conclusion of three models of general thermal analysis unit-body. Any thermal analysis model of helicopter gearbox of different structures could be quickly and efficiently established by unit-bodies and its derivatives. As an example, the method was applied to a helicopter gearbox. Through comparison of the analytical results and the experiment results, it was found that the temperature distribution of the helicopter gearbox could be high-efficiently obtained by the method, and the maximum error between analysis and experiment was 5.07%, meeting the requirement of engineering calculation for thermal analysis of gearbox.