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 HM 159.11 Ship Vibration Apparatus
 Technical Description

The HM 159.11 is used to investigate the dynamic behaviour of a ship structure. It therefore allows the first steps in the area of experimental vibration analysis or modal analysis.

Experimental vibration analysis is an indispensible element of modern shipbuilding development activity. This trainer allows the natural frequencies and modes of the model ship to be measured and recorded. The simple, stylised ship form simplifies the mathematical resolution of the problem. The model ship and an electrodynamic exciter are attached to a height adjustable cross beam. The beam has a high natural frequency that doesn't interfere with the measurements. A function generator creates different exciter signals: sinusoidal, triangular and rectangular signals. The frequency, amplitude and offset are adjustable. An acceleration sensor at various points measures the response of the model to the vibrations generated.
For experiments in water, a tank is required (not included).

Learning Objectives / Experiments
- Measurement and recording of natural frequencies
and modes of the model ship (in air)
- Influence of discrete additional masses or ballast
on natural frequency and mode (ballast and
- Vibration behaviour of model in air
- Vibration behaviour of floating model (possible with
- Comparison of theory (approximation formula for
determination of first bending natural frequency) and
practice (measured natural frequency)
 Features

* Dynamic behaviour of a ship structure1
* Simple ship form simplifies mathematical

calculations1
* Different exciter signals possible1
* Selectable exciter and measuring points

 Alternative products
HM 150.06 -- Stability of Floating Bodies
 Specification [1] Vibration behaviour of a model ship in air or in water (with additional tank)[2] Frame with height adjustable cross beam [3] High natural frequency of cross beam due to closed box beam section with high rigidity and low weight[4] Plastic model ship with elliptical half-breadth plan and 9 deck stringers [5] Capacitive acceleration sensor with measuring amplifier [6] Exciter with co-ordinated power amplifier and function generator: sinusoidal, triangular or rectangular signal[7] Representation of measuring values on an oscilloscope possible (not included) Technical Data Exciter- electrodynamic type with permanent magnet- max. force: 8.9N- frequency range: 5...12,000HzFunction generator- frequency, amplitude and offset adjustable- output: 0...10Vpp, 50 OhmAcceleration sensor- measuring range: +/-5g- frequency range: 0...400HzModel ship- deck stringer with fastening holes for sensors and suspension Dimensions and Weight l x w x h: 1800 x 400 x 1700 mm (frame)l x w x h: 1200 x 200 x 150 mm (model ship)Weight: approx. 50 kg Required for Operation 230V, 50Hz, 1 phase Scope of Delivery 1 frame 1 model ship, 4 tension springs, 1 measuring amplifier, 1 power amplifier, 1 exciter, 1 function generator, 2 multimeters, 1 acceleration sensor1 set of cables1 manual Order Details 070.15911  HM 159.11  Ship Vibration Apparatus