The system coefficients c 1 c 9 and d 0 d 9 are computed through minimizing a nonlinear least-squares error function as, arg mathop {hbox{min} }limits_{c,d} mathop sum limits_{k = 1}^{m} left( {frac{{f_{c} }}{{f_{d} }} - z_{k}^{b} } right)^{2}, (23 where k is the ordinal number of each point and m denotes the total number of points.
To solve the identification problem of multivariable nonlinear discrete-time systems, each of estimated system coefficients represents a gene, and a collection of genes is referred to as a chromosome in the view of GA.
The states and system coefficients equations can then be summarized as: (4) The last two equations determine the current system coefficients, which will be appended to the system state.
Meanwhile, adjusting the refrigerant distribution by using valves located at each circuit could improve the frosting evenness value, and system coefficient of performance and the defrosting efficiency are thereby both optimized.
Based on the system's coefficients and the structure of the system, simple feedback control laws and corresponding Lyapunov functions are constructed.
The simulation results obtained for some well known benchmark examples justify the efficacy of the proposed OHS based system identification approach over GA, PSO and DE in terms of convergence speed, identifying the system plant coefficients and mean square error (MSE) fitness values produced for both same order and reduced order models of adaptive IIR filters.
System performance parameters (fresh water production rate, cooling capacity, electrical power consumption, water recovery and system coefficient of performance) are hourly estimated and daily integrated for different operational and design conditions.
The best performance corresponds to the system using propane, because has the highest system coefficient of performance and its ejector has the maximum entrainment ratio value, the least area ratio value and the highest efficiency value.
A parametric study and a regression analysis have been performed to characterize the system and to estimate the overall system coefficient of performance (COPoval) and exergetic efficiency (ηex_oval).
At the same time, the obtained results are also applicable to time-varying delay Lurie indirect control systems with bounded coefficients and the systems with constant coefficients.
