风洞电液伺服控制系统频率特性的研究

RESEARCH ON THE FREQUENCY RESPONSE OF ELECTROHYDRAULIC SERVO CONTROL SYSTEMS USED IN WIND TUNNEL

针对拟建的某大型跨声速风洞中电液伺服系统的特点，按数学模型相似的方法建立模拟试验系统，让模拟系统具有与真实系统相近的数学模型，从而使两者具有相近的动态特性。在此基础上深入研究系统的频率响应特性。通过理论及对试验结果的分析，总结出伺服系统极限频宽与油缸推力和伺服阀流量的关系，并应用于对风洞电液伺服系统的设计。

Considering the specific characters of the electrohydraulic servo systems used in a large scale wind tunnel which will be constructed recently,we present a new method to build a simulated system according to the similarity between mathematical models of the simulator and the virtual systems in order to make the results obtained in experiments more practical,because the simulator has similar dynamic behavior with the virtual one. On the basis of the system,further studies on its frequency response will be carried out. By theoretical and experimental analysis,relations between the utmost frequency bandwidth of the system and the thrust force of the cylinder & rated flow of the servovalve are established,which are applied to guide the design of servo systems in the wind tunnel.