Exam Question

(a) Explain how wave profile affects the shear force and bending moment curves. (6)

(b) The wetted surface area of a Container ship is 5946 sq. meter, when travelling at its service speed, the effective power required is 11250 KW with frictional resistance 74 % of the total resistance and specific fuel consumption of 0.22 Kg/kW h. To conserve fuel the ship speed is reduced by 10%, the daily fuel consumption is then found to be 83.0 tonne. Frictional coefficient in sea water is 1.432, Speed in m/s with index (n) 1.825. Propulsive coefficient may be assumed constant at 0.6.

Determine (10)

(i) The service speed of the ship.

(ii) The percentage increase in specific fuel oil consumption when running at reduced speed.