摘要
为了提高工况变化过程中液氮供应系统的控制精度,满足低温风洞系统对液氮喷注流量的要求,对影响液氮供应系统控制精度的因素进行分析仿真。首先通过建立气动薄膜调节阀的传递函数,分析不同厂家薄膜调节阀的控制特点,并在此基础上建立考虑阀门特性的系统仿真模型,研究阀门特性对液氮供应系统控制特性的影响;然后提出前馈加反馈控制策略应用于液氮供应系统,并建立采用该策略的系统的仿真模型。仿真结果表明:气动薄膜调节阀的动静态特性影响液氮供应系统的控制精度和工况变化时的再稳定时间,单靠选用高精度的调节阀和反馈控制策略无法满足系统的性能指标,必须与前馈控制方法相结合才能实现系统的高精度控制。
To improve the control precision of the liquid nitrogen delivery system in the process of changing working conditions and satisfy the liquid nitrogen injection flow rate of cryogenic wind tunnel,the factors affecting the control precision of liquid nitrogen delivery system were simulated and analyzed.Firstly,the control characteristics of pneumatic diaphragm control valve were analyzed by establishing the transfer functions of pneumatic diaphragm control valve.On this basis,system simulation model was built to research the influence of valve characteristics on the liquid nitrogen delivery system.Then feedforward control and feedback control were used in liquid nitrogen delivery system and the simulation model was built.The simulation results show that the characteristics of pneumatic diaphragm control valve influence the control precision of liquid nitrogen delivery and the re-stability time and the high-precision control can be reached when feedforward control is combined with feedback control method.
作者
郭敬
李茂
魏仁敏
Guo Jing;Li Mao;Wei Renmin(Beijing Institute of Aerospace Testing Technology,Beijing 100074,China)
出处
《低温工程》
CAS
CSCD
北大核心
2020年第6期62-68,共7页
Cryogenics
关键词
液氮供应系统
控制
仿真
liquid nitrogen delivery system
control
simulation
作者简介
郭敬,女,41岁,博士、高级工程师。
