固体姿轨控发动机燃气阀门高频工作特性研究

High Frequency Characteristics of Solid Attitude and Orbit Control Rocket Gas Valve

关键词:  固体姿轨控发动机  旋转式燃气阀门  高频切换  伺服电机  动态响应

Key words:  Solid attitude and orbit control rocket  Rotary gas valve  High frequency switching  Servo motor  Dynamic response

摘要:

燃气阀门技术是固体姿轨控动力系统的核心技术之一，本文提出了一种电机直驱的旋转式高频工作燃气阀门系统，该系统具有动态响应迅速、结构简单可靠等优点。通过对阀门受热膨胀分析以及高压气流冲击的仿真分析，综合考虑阀门高频切换的可靠性和燃气泄漏量，对阀门间隙进行了优化设计；同时，针对阀门转角、电机减速比与阀门到位时间进行了参数化性能影响分析，发现在确保阀门可靠切换所需转矩的前提下，降低电机减速比能够大幅提升阀门高频响应性能；阀门到位时间随阀门转角变化的增幅低于线性增长幅度，可适当增大阀门转角以消除控制偏差和装配偏差的影响。最后，通过研制的一台单阀门样机进行地面热试考核，验证了电机直驱的旋转式高频工作燃气阀门工作的可靠性，阀门全程切换正常，响应时间在10ms以内。

Abstract:

Gas valve technology is one of the core technologies of solid attitude and orbit control system. A high frequency rotating gas valve system driven directly by servo motor is presented. The system has the advantages of rapid dynamic response， simple and reliable structure. The valve clearance is optimized by analyzing the thermal expansion of the valve and simulating the impact of high-pressure air flow， considering the reliability of high-frequency switching of the valve and gas leakage. The influence of valve angle， motor speed-down ratio and valve arrival time on the parametric performance is analyzed. On the premise of ensuring the required torque to switch the valve reliably， reducing motor speed-down ratio can greatly improve the high-frequency response performance of the valve. The increase of valve arrival time with valve angle is lower than the linear increase， so the valve angle can be increased to eliminate the influence of control deviation and assembly deviation. Finally， a single valve prototype was developed for the ground thermal test to verify the reliability of the motor-driven rotary high-frequency working gas valve， the valve switch is normal， the response time is less than 10ms.