电动静液作动器热特性分析与结构优化

电动静液作动系统(Electro-Hydrostatic Actuator System,EHAS)是多电飞机关键子系统之一,系统结构紧凑,换热能力差,影响飞行安全,因此EHA热特性研究是一个具有现实意义的课题。通过对EHA整体结构进行简化处理,得到热特性分析模型,运用有限元仿真软件进行热特性仿真。对比实验结果,验证了该分析方法的准确性,并提出了结构优化方案。通过优化建模,运用仿真得到优化后模型的热特性,并与原模型特性对比得出,EHA结构整体稳态热分析最高点温度降低29.5%,瞬态分析最高点温度降低22.3%。该研究为求解EHA热特性提供了一种方法,对现有EHA的结构布局提出一种优化改进方案,提升了EHA的热特性,有助于电作动新产品的开发设计。

Thermal Characteristics Analysis and Structural Optimization of Electro-Hydrostatic Actuator

Electro Hydrostatic Actuator System (EHAS) is one of the key subsystems of more electric aircraft. Because of its compact structure, the heat transfer ability is poor, which influence the flight. Therefore, thermal characteristics research of EHA is very important. Simplified the structure of EHA whole processing and obtained the thermal characteristics analysis model, the thermal characteristics of EHA were received by using the finite element (FE) simulation software. Compared with the experimental results suggested that the analysis methods is accurate and structure optimization schemes were put forward. Through optimization modeling and simulation, the thermal characteristics of optimized model were obtained. The steady state thermal analysis maximum temperature of EHA optimized structure was reduced by 29.5% and the maximum temperature of transient analysis by 22.3%, as compared with the original model. The research provides a solution to analysis EHA thermal characteristics, which proposes an optimization and improved scheme for existing structure layout, to improve the thermal characteristic. Furthermore, the research is helpful for the development and design of new products.