Co-design of thermal-fluid system with coupling analysis
As an indispensable component of the integrated energy system,the thermal-fluid systems are typically designed by using steady-state assumptions,and a design of controller is followed.However,this method ignores the coupling relationship between system and controller,resulting in poor transient performance of system.In this study,a co-design method involving the design metrics of total mass,entropy production rate and control effect is proposed.The system is designed by combining nested design method and simultaneous design method,along with the mathematical model of thermal-fluid system and entropy production rate model.The time series mode distance is introduced to construct correlation measure function to analyze the coupling relationship between physical system and controller,which reduces the number of non-coupling parameters.Meanwhile,the data analysis method is used to further decrease the range of design parameters.A design example of an ideal thermal-fluid system is given,and the simulation results show that the number of design parameters is reduced by 66％and the selection range is reduced by 26％measured by correlation measurement function and data analysis,respectively.In addition,the system designed by co-design method is superior to that by the traditional sequential design method,with a decrease of 29％in control error.The disturbance rejection ability of the designed controller is also better than that of the frequency domain method and the SIMC method.
万方数据
维普
