Cam and groove coupling analysis is usually divided into two kinds of methods

　　The strong cam and groove coupling (or tight coupling) and weak cam and groove coupling (or loose coupled). The first method is putting the coupling structure to control equation by element matrix or load vector, then the control equations are solved directly. The second kind of method is in every step of the fluid dynamic equation and dynamic equation for the first time, make the physical field as the result of external load on the second physical field to implement the two field cam and groove coupling.

　　For the strong cam and groove coupling, its main disadvantage is often having to simplify the problem in the construction process control equations, the calculation accuracy is difficult to guarantee. For weak cam and groove coupling, its advantage is to use general fluid and structure of existing software, and can be separately formulated method suitable for each software, the shortcoming is that the computation process is relatively complex. Strong coupling is suitable for the coupled field analysis; weak cam and groove coupling is suitable for numerical calculation of coupled field

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