摘要
针对战斗机用逆向式平板活门氧气减压器,通过对工作原理进行分析并简化结构,建立了减压器的稳态和动态数学模型。为保证模型正确性及系统的精度,采用四阶龙格库塔法进行数值仿真,从理论分析和仿真结果两方面综合分析了减压器的稳态特性和动态特性,可有效减少试验项目,缩短减压器设计和改进的时间。在数值仿真过程中,从入口压力和流量的变化上,分析对减压器出口压力的影响,进一步找到了影响减压器动态特性的关键因素(阻尼系数)。结果显示了当阻尼系数稍大于或等于系统振动频率值时,减压器的稳定性和灵敏性都很高。通过对比两者结果比较吻合,表明了所建立的数学模型是正确的,对减压器的设计和改进提供可靠的参考依据。
By analysing the working process and simplifying the theoretic structure, the steady and dynamic mathematic models of the reverse - type pressure regulator which was a part of the aviation Oxygen Supply System （OSS） were built. Four - step Runge - Kutta method was adopted for the numerical simulation analysis. By comparing the solutions of numerical simulation and theoretical analysis, the steady and dynamic characteristics of the pressure regulator were analyzed. By the numerical simulation, the experiment items and the time of design and improvement for the pressure regulator were reduced. During the numerical simulation, the influences of inlet pressure and flux on the outlet pressure were analyzed. Damping coefficient was found to be the key factor affecting the dynamic characteristics. The results showed that the regulator was steady and sensitive when the damping coefficient wasn＇ t less than the oscillation frequency. At last, the analytical models were found to be correct by comparing simulation results with experiment results. It was important to the design and improvement of the pressure regulator.
出处
《计算机仿真》
CSCD
北大核心
2009年第11期89-93,共5页
Computer Simulation
关键词
逆向式
氧气减压器
稳态特性
动态特性
数值仿真
阻尼系数
Reverse - type
Regulator
Steady characteristics
Dynamic characteristics
Numerical simulation
Damping coefficient
