TIME-DELAY MODELS PARAMETERS IDENTIFICATION OF HEAT TRANSFER SYSTEMS USING THE HYBRID ALGORITHM
The paper presents the identification issues and a parameters identification algorithm that separates the system parameters from the time-delays for the class of single input single output (SISO) linear time delay systems (LTDS). The presence of the unknown time delay greatly complicates the parameter estimation problem, because the parameters of the model are not linear with respect to the time-delay. However, once the time delay is determined, the model becomes linear for the other coefficient parameters and hence the common least square method can be utilized directly. This problem is solved in the paper 12. Solution presented in the previous mentioned paper is based on the nonlinear least square problem developed in the paper 3. The hybrid method based on the Genetic algorithm and the Nelder-Mead technique is used for the minimization of variable projection functional. The both techniques use a little local information and don’t require the derivation of the cost function. According to this fact the both previous mentioned techniques have a problem with the reliability and convergence rate. The convergence rate is smaller than the optimization techniques of the first order which use more local information including the gradient of cost function. In order to achieve the better convergence rate, the Quasi-Newton optimization method is used instead of the Nelder-Mead method. The special Broyden-Fletcher-Goldfarb-Shanno (BFGS) Quasi-Newton algorithm, which involves the several initial conditions treated at the same time developed by 8, is applied here. This approach is illustrated by a particular application in the field of the heat transfer, concretely on the time-delay model of the recuperative plate heat exchanger.
Goran Simeunovic Pavel Zítek Jan Chysky Marija Miletic
CTU in Prague,Centre for Applied Cybernetics,Department of Instrumental and Control Eng.,Prague, Cze CTU in Prague,Department of Instrumental and Control Eng.,Prague, Czech Republic CTU in Prague, Department of Nuclear Reactors Prague, Czech Republic
国际会议
18th International Conference on Nuclear Engineering(第18届国际核能工程大会 ICONE 18)
西安
英文
1-5
2010-05-17（万方平台首次上网日期，不代表论文的发表时间）