基于PWM原理的固体姿态控制系统实验研究

Experimental investigation on solid attitude control system based on PWM principle

为研究基于脉宽调制(PWM)原理的固体姿态控制系统(ACS)推力调节特性,设计了双推力器组合工作ACS,并开展了冷流实验。根据实验结果对动态工作过程、响应性能和推力调节特性进行了分析,提出了ACS在小型空间飞行器姿态控制方面的应用方案。结果表明,设计的ACS能实现推力连续调节;推力曲线形状与工作频率和占空比有关;平均推力与占空比呈线性关系;双推力器组合工作模式能大幅减小喷喉上游管路压强波动。研究结论可为用于小型空间飞行器的固体姿控发动机的研制和应用提供参考依据。

In order to investigate the characteristics of solid attitude control system （ACS）based on PWM principle,an ACS comprised of two collaborative thrusters was designed and bench tested.Through this system,experiments were carried out to validate thrust adjustment principle.Based on experiment results,dynamic process,response characteristics and thrust adjustment performance were investigated.A project in which PWM ACS is applied on small space vehicles was put forward.Results show that,with this type of ACS,continuous thrust adjustment is feasible in principle.Both working frequency and duty ratio have obvious effect on thrust curves.Linear relationship is obtained between average thrust and duty ratio.With collaborative work mode of double thrusters,upstream pressure of nozzle throat may be drastically reduced.The conclusions could provide reference for investigation and application of SACS to small space vehicles.