Modern complex mechanical and electrical system is a complex system that integrates mechanical, electrical, hydraulic, optical and other physical processes into the same carrier. Its common characteristics are at least shown in the following four aspects:<br>(1) The multi-functional complex mechanical and electrical system, which integrates a variety of high and new technologies, has the core characteristics of complex physical structure, high technology depth and wide width, and intensive interdisciplinary knowledge intersection and integration.<br>(2) The system is composed of several subsystems of the same or different levels, and each subsystem is an organic whole with complex electrical structure through coupling.<br>(3) The system is dynamic and open. Through the coupling and cooperation of energy flow, material flow and information who transfer, transform and evolve, it realizes many complex physical processes and forms the basic functions of the system.<br>(4) Because of the complexity of complex electromechanical system in function, structure, coupling relationship and physical process, it shows the typical characteristics of general complex system.<br>
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