Measurements of propeller forces exciting hull vibrations by use of self-propelled model

Article type: Research Article

Authors: Kumai, Toyoji^a | Tomita, Tetsujiro^b | Tasai, Fukuzo^a | Suhara, Toshiro^a

Affiliations: [a] Kyushu University, Japan | [b] Hull Department, Mitsui Shipbuilding and Engineering Co. Ltd.

Abstract: The present report provides the experimental study on the measurements of propeller forces exiting hull vibration by use of self-propelled model. The special considerations are given for measuring the components of the reactions of propeller shaft at the bearing, and surface forces applied at the end parts of the stern as well as those of the thrust and torque variations. The experiments were carried out by making model ship selfpropel along about 200m straight course in a reservoir, where manipulation, operation of the meters equipped in the ship and recording were all conducted by wireless instructions. The effects of number of blades of propeller on the vibratory exciting forces on the ordinary stern and Weser stern are obtained by replacing 3, 4, 5, and 6-bladed propellers for two models. The effect of screw aperture on the vibratory propeller forces in the ordinary stern is also obtained.

DOI: 10.3233/ISP-1964-1111404

Journal: International Shipbuilding Progress, vol. 11, no. 114, pp. 85-95, 1964