동역학 부분인데요.
mirror principle에 대해 알고 싶습니다.
잘 이해를 못하겠네요.
mirror principle에 의해 유체의 virtual mass가 왜 저래 되는지 모르겠네요.
2.3 Main assumptions of the theory
The ship manoeuvring theory is based on the following assumptions:
The ship motion is occurred only in the horizontal plane x-y.
Heave velocity, rolling and pitching are neglected (Vz = 0, ωx = ωy = 0).
The Froude number is small and the free surface deformation is neglected.
The mirror principle is used to model the free surface effect.
Hydrodynamically the ship is considered as a doubled body without any flow boundaries except the ship.
The doubled body has two symmetry planes that is why the ship has only eight added mass: m11, m22, m33, m44, m55, m66, m26, m35.
The static moment of the doubled body and the product of inertia are zero, i.e. Sz = 0 and Ixz = 0.
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