民用飞机液压系统仿真设计与研究

The simulation design of the civil aircraft hydraulic system

民用飞机液压系统是飞机的主要能源系统之一,在飞机起飞和着陆过程中也发挥着重要的作用,液压系统的温度过高或过低都会对飞机的安全产生影响。针对民机液压系统在起飞爬升、巡航以及着陆过程中温度的变化过程,基于AMESim软件平台建立了民用飞机液压系统热特性模型,仿真分析了特殊天气条件下液压系统各关键点的温度。仿真结果表明:在高温天气工况下,随着时间的推移,液压系统各关键点的温度都会急剧升高,最高温度是壳体回油出口温度,为80.4℃,泵入口的温度明显低于泵出口以及壳体回油温度;在低温天气工况下,液压系统在壳体回油处的温度达到了最高,约为30℃左右,泵入口的温度及各用户的温度明显低于壳体回油温度,这一特性也为后续液压系统的温度包线设计提供了必要的支撑。

Within the complete temperature envelope of the aircraft,it is necessary to ensure the temperature safety of the hydraulic system and eliminate hidden dangers.This article establishes a thermal characteristic model of the aircraft hydraulic system in AMESim through simulation methods.The temperature of each critical point of the hydraulic system under special weather conditions was simulated and analyzed.Under the condition of high temperature weather,with the passage of time,the temperature of each key point of the hydraulic system will rise sharply,the highest temperature is the shell oil return temperature,which is 80.4 C,the temperature of the pump inlet is significantly lower than pump outlet and the shell oil return temperature,in the low temperature weather conditions,the temperature of the hydraulic system in the shell oil return has reached the maximum,about 30 C,the temperature of the pump inlet and the temperature of each user are successively lower than the shell oil return temperature,and this characteristic provides strong support for the temperature envelope design of the subsequent hydraulic system.