Frequency response: the gold standard

摘要

What do engineers "see" when they look at a real system or conceive a new design? They will look past the hardware and visualize the flow of energy, where it is stored, and where it is dissipated. They will identify the kinetic energy of moving fluids and solid masses; the potential energy of compressible fluids, elastic hoses and tanks, and deformable solids; the energy stored in electric and magnetic fields; and the energy lost through friction generating heat. But they will also "see" how the system might respond to real-world inputs by understanding the frequency response of the system and the frequency spectrum of the probable inputs.