Computer‐aided nonlinear system design and simulation
Motoaki Ito, Naohiro Ishii, Masanori Sakuranaga · Systems and Computers in Japan · 1987
Abstract To explain a phenomenon in a nonlinear system and to find its function, a useful method is to construct the nonlinear system in a dialogue form with a computer and to obtain its characteristics. This paper introduces the software commands to design a nonlinear system by using a dialogue form with a computer, and the method of a simulation of the subsystem constructed. The procedure of the specifications of the design of the nonlinear system is as follows: a block‐line diagram consisting of a linear system and nonlinear subsystems is constructed for the subsystems within the system, and the simulation is carried out based on this diagram. A simulation‐system command, simulation‐execution command, and supporting commands were developed for the dialogue‐type commands required for the design. Then if a subsystem is linear, its input response is specified by the z‐transformation equation; and if a subsystem is nonlinear, this is specified by the form of a polynomial of the input variables of the system. Three types of combination of the subsystems within the whole system were discussed: the series connection, parallel connection, and feedback connection. A white noise was fed into the input of the system constructed, and the first‐ and second‐order Wiener kernels, which were obtained as the Wiener‐functional and showed the characteristic of the system, were shown.