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Physical model< r:< A physical object that is scaled down to the original system < r(< or can be enlarged or have the same size as the original system < r)< based on the similarity theory < < For example, an aircraft model in a wind tunnel experiment < < Hydraulic system experimental model < < Architectural model < < Ship model, etc. < r

. Physical model
Also called entity model, it can be divided into physical model and analog model. < r①< Physical model: a physical object that is scaled down (or enlarged or the same size as the original system) manufactured based on the similarity theory, such as aircraft models in wind tunnel experiments, hydraulic system experimental models, architectural models, ships Models etc. < r②< Analogy model: In systems in different fields of physics (mechanics, electricity, thermal, fluid mechanics, etc.), their respective variables sometimes obey the same laws. According to this common law, completely different physical meanings can be produced Models of comparison and analogy. For example, under certain conditions, the pressure response of a pneumatic system composed of a throttle valve and an air volume has a similar pattern to the output voltage characteristics of a circuit composed of a resistor and a capacitor. Therefore, a circuit that is easier to experiment with can be used to simulate the pneumatic system.