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Products | Fluid Mechanics and Hydrology | Hydrology and Hydraulic Engineering | HM 159 | HM 159.11

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 unit 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
- Influence of discrete additional masses or ballast
on natural frequency and mode (ballast and
additional masses not included)
- Vibration behaviour of model in air
- Vibration behaviour of floating model (possible with
additional tank)
- Comparison of theory (approximation formula for
determination of 1st bending natural frequency) and
practice (measured natural frequency)

Features

* Investigation of the vibration behaviour of the model
ship in air and in water (with additional tank)
* Simple ship form simplifies mathematical calculations
* Different exciter signals possible
* Selectable exciter and measuring points

Alternative products

HM 150.06 -- Stability of a Floating Body

Specification

[1] Investigation of vibration behaviour of a model ship in air or in water (with tank)
[2] Frame with height adjustable cross beam
[3] Cross beam: High natural frequency due to closed box beam section with high rigidity and low weight
[4] PVC 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] 230VAC, 50Hz

Technical Data

Exciter: electrodynamic type with permanent magnet, max. force: 8.9N, frequency range: 5...12000Hz
Function generator: Frequency, amplitude and offset adjustable, output: 0...10Vss, 50Ohm
Acceleration sensor: Measuring range: +/-5g, frequency range: 0...400Hz
Model ship: Deck stringer with fastening holes for sensors and suspension,
l x w x h: 1200x200x150mm, approx. 3.7kg

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)
Weight : approx. 50 kg

Connections

230V, 50Hz, 1 phase

Scope of Delivery

1 test frame with mountings for model and exciter, 1 model ship, 4 tension springs, 1 measuring amplifier, 1 power amplifier, 1 exciter, 1 function generator, 1 acceleration sensor, 1 set of cables, 1 instruction manual

Order Details

070.15911 HM 159.11 Ship Vibration Apparatus