某型商用飞机前起落架应急放仿真分析

Simulation Analysis of Nose Landing Gear System for Some Commercial Aircraft

摘要:

起落架收放功能的可靠性对飞行安全至关重要。首先根据某型商用飞机前起落架系统原理,建立机械、液压领域的Modelica模型。其次,根据系统中组件的独立试验数据对组件模型进行参数标定。再次,利用系统工况试验数据对所标定的模型进行验证。最后,得出关于关键组件参数标定和系统验证结论如下:(1)关键组件应急放作动筒仿真曲线与实验数据基本吻合;(2)系统工况仿真能够准确再现起落架各种实验中观测到的现象,仿真曲线与实验数据吻合度较高;(3)验证了本文构建的系统模型的有效性,为下一步进行阻尼分析,准确查找前起落架故障提供了前提条件。

Abstract:

There happened many grave accidents by landing gears, which weren′t able to lay down and forced to make an emergency landing for modern aircraft. The reliability of landing gear retraction units is very important.Firstly, the Modelica model of mechanical and hydraulic field was established according to the principle of the nose landing gear system for some commercial aircraft. Secondly, the component model parameters were calibrated with the independent test data of the components in the system. Thirdly, the calibration of the model was verified using the system test data. Finally, the key components calibration parameter and system validation conclusions were as follows:(1)the simulation curve of key components for emergency discharge actuator agreed well with the experimental data. (2)the system simulation could accurately reproduce all the observed phenomena of the landing gear.The simulation curve and experimental data were of higher degree of agreement. (3)The result verified the validity of the established system model,and a prerequisite was provided for the next damping analysis to exactly find the failure of the nose landing gear.