基于分段阶跃响应法的制冷系统传递函数辨识  

SYSTEM IDENTIFICATION OF REFRIGERATING SYSTEM TRANSFER FUNCTION BY PARTITION STEP-RESPONSE

作　　者：孙启扬 金占雷[1] 毛毅华[1] 戴立群[1] 徐圣亚[1] 徐丽娜[1] 

机构地区：[1]北京空间机电研究所,北京100094

出　　处：《真空与低温》2015年第5期307-310,共4页Vacuum and Cryogenics

摘　　要：制冷系统的系统原理复杂,难以利用机理分析法推导出准确的系统模型。提出一种基于分段阶跃响应法的系统传递函数辨识方法,对某脉管制冷系统进行分段阶跃响应试验,利用Matlab对试验数据进行处理,辨识出系统的分段传递函数。传函表明随着焦面温度的降低,系统的稳态增益呈减小趋势,与理论推导相吻合,印证了方法的有效性,获取模型为后续制冷系统的控制算法的设计奠定了基础。System identification of refrigerating system is hard to realize by mechanism analysis because of the complexity of system.This paper proposes a method based on partition step-response to get the transfer function of a refrigerating system.According to an experiment,the transfer function we get indicates that as the temperature of the FPA grows,the steady-state gain of the system decreases which verifies the theoretical derivation.It has set up a foundation for the development of the system control algorithm.

关 键 词：制冷系统 系统辨识 分段 阶跃响应法 

分 类 号：TB65[一般工业技术—制冷工程]