By using the least square method,this paper put forward a method for calculation of ship form factor which will be used in the three-dimension method for scaling ship model resistance.

An investigation of applying three-dimensional extrapolation to twin-screw ship is presented in this paper, based on model tests and conversion of a conventional twin-screw ship with low block coefficient, a conventional twin-screw ship with high block coefficient and a full ship with twin- screw stern.

On the calculation of correlation △C_F in three-dimensional conversion;

Dimensional analysis method is an efficient method to abtain the similitude principles.

Aiming to many fatcors(including economic and noneconomic factors) in enterprise s facility address,the paper determines their weight in the method of analytic hierarchy process and dimensional analysis,and simplifies calculation procedure.

This paper conducted a study on motion specifitity of outer geneva mechanism,and gave out a non-dimension calculating method of driving torque about this mechanism by introducing non-dimension method.