dynamic behaviour of a ship structure
- Nowadays, experiment-based vibration analysis is an essential component in shipbuilding design and development.
- The HM 159.11unit 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 HM 159.11unit 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.
- An electrodynamic vibration exciter causes the model ship to vibrate.
- A function generator produces the excitation signal, which can be adjusted in amplitude and frequency.
- An arbitrarily position able acceleration sensor measures the model’s response to the excitation signal.
- In this manner, the transfer functions for various points of the model ship can be generated step by step.
- These can be used to determine the vibration modes for various natural frequencies. Experiments can also be conducted in water.
- An additional tank is required to conduct these experiments (not included).
- Complementary experiments can be conducted with additional ballast and weights.
- 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 (not included)
- Vibration exciter
- electrodynamic type with permanent magnet
- 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
Dimensions & Weight:
- L x W x H: 1800x400x1700mm (frame)
- L x W x H: 1200x200x150mm (model)
- Weight: approx. 50kg
- measure and record natural frequencies and modes of the model ship (in air)
- vibration behaviour of the model shipping 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)
Scope of Delivery:
- 1 trainer
- 1 model ship
- 4 springs
- 1 measuring amplifier
- 1 power amplifier
- 1 vibration exciter
- 1 function generator
- 2x multimeter
- 1 acceleration sensor
- 1 set of cables
- 1 set of instructional material
- dynamic behaviour of a ship structure
- simple ship form simplifies the mathematical approach
- different excitation signals possible
- optional excitation and measuring points
Due to the continuous development of our products, the goods supplied may vary in detail to that illustrated on this Website.