Fast time-varying thermal coupling control method for complex graphite arrays
To accurately simulate real service thermal environments during structural thermal test of hyper-sonic vehicles,fast time-varying thermal coupling control methods are used to control the complex graphite arrays.The transient heat loss and transient blackbody radiation are substituted into the control equation by the thermally coupled control method to realize the real-time acquisition of the real thermal response state of the test piece.Typical histories of thermal loads and graphite array control response characteristics for struc-tural thermal tests are studied,an expert PID control strategy based on structural thermal test is designed,and the segmented control parameters for the full course of a complex graphite array are given.The elec-tric characteristics of the graphite array are studied,and the time-varying voltage limit control strategy is designed to improve the reliability of the graphite array.A multi-temperature coupling compensation con-trol method is designed to reduce the coupling interference between temperature zones.The results show that the maximum error between the experimental temperature curve and the theoretical calculation curve is 4.8％in the rapid warming section,1.4％in the smooth section,and 2.3％in the descending section.The overshoot of the control system is effectively reduced,and the system response speed is improved.The control error of complex graphite array is less than 1.2％using the fast time-varying thermally cou-pled control method in a test.
hypersonic vehiclesstructural thermal testcomplex graphite arrayexpert PIDcoupling compensation control
万方数据
维普
