Ships Vibrations Test Model

Ships Vibrations Test Model

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Ships Vibrations Test Model is designed to enable students to investigate a simple model hull form for resonance phenomena. It may be used in conjunction with the optional Flotation Tank or any suitable customer supplied tank. Many of the principal phenomena associated with ship resonant vibration are clearly demonstrated.

At a more advanced level the distribution of mass and second moment of area may be calculated and using a Young’s Modulus value for the material of the ship shaped beam, the natural frequencies may be estimated by a simple tabular method or other means and compared with the measured value.

DEMONSTRATION CAPABILITIES:-
In air to:
Investigate modal characteristics of a simple suspended ship-shaped box girder
Produce a resonance curve
Produce the amplitude curve of a two-node and three-node flexural model
Illustrate the influence of mass and its distribution upon natural flexural frequencies

In water to:
Measure the influence of added virtual mass on natural frequency
Illustrate the effect of the addition and distribution of sand ballast on the natural frequency
Calculate the added virtual mass by different methods

TECHNICAL SPECIFICATIONS:-
Apparatus designed to enable students to investigate a simple model hull form for resonance phenomena
The apparatus comprises an experimental model hull, a rigid supporting frame, a vibrator (complete with signal generator and power amplifier) and an optional flotation tank
The experimental model is flat bottomed wall-sided and open topped.
It has an elliptical plan form:
Length to beam ratio 8:1
Length to depth ratio 12:1
Used to demonstrate the principle phenomena associated with ship resonant vibration
Investigate resonance phenomena in both air and water