Model No- ASLE126B
Nowadays, experiment-based vibration analysis is an essential component in shipbuilding design and development.
The unit helps students take their first steps in the field of experimental vibration analysis or modal analysis of structures. Using this trainer, the dynamic behaviour of a ship structure is studied, teaching students the fundamentals of experimental vibration analysis.
The unit can be used to measure and record the natural frequencies and modes of a model ship. The simple, idealised ship shape makes it easier to approach the problem mathematically. The plastic model ship has nine ribs and an elliptical line plan.
The model ship is attached to a rigid cross-member by springs. The enclosed box cross-section with high rigidity means the natural frequency of the cross-member is negligibly high.
Learning Objectives/Experiments:
Measure and record natural frequencies and modes of the model ship (in air)
Vibration behaviour of the model shipin air
Comparison between theory (approximation formula for determining the first bending frequency) and practice (measured natural frequency)
Influence of discrete additional masses or ballast on natural frequency and mode (ballast and extra weights not included)
Vibration behaviour of floating model ship (possible with additional tank)
Specification
Vibration behaviour of a model ship in air and in water (with additional tank)
Model ship mounted on springs; vibration excitation and acceleration measurement at any point
frame with height-adjustable cross-member for attaching the model
High natural frequency of the cross-member owing to enclosed box cross-section with high rigidity and low weight
Plastic model ship with elliptical lines plan and 9 ribs
Capacitive acceleration sensor with measuring amplifier, freely positionable
Vibration exciter with power amplifier and function generator: sinusoidal, triangular or rectangular signal
Possible to display measured values on an oscilloscope
Technical Data
Vibration exciter
electrodynamic type with permanent magnet
max. force: 8,9N
frequency range: 5…12000Hz
Function generator
adjustable frequency, amplitude and offset
output: 0…10Vss, 50 Ohm
Acceleration sensor
measuring range: ±5g
frequency range: 0…400Hz
Model ship
deck stringer with fastening holes for sensors and suspension
230V, 50Hz, 1 phase
230V, 60Hz, 1 phase; 120V, 60Hz, 1 phase
UL/CSA optional
LxWxH: 1800x400x1700mm (frame)
LxWxH: 1200x200x150mm (model)
Weight: approx. 50kg