HM 159.11 Natural Vibration On A Ship Model Didactic Equipment Vocational Education Equipment Mechanical Training Equipment
Dynamic behaviour of a ship structure; experiments in air and in water Features - dynamic behaviour of a ship structure - simple ship form simplifies the mathematical approach - different excitation signals possible - optional excitation and measuring points 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 [1] vibration behaviour of a model ship in air and in water (with additional tank) [2] model ship mounted on springs; vibration excitation and acceleration measurement at any point [3] frame with height-adjustable cross-member for attaching the model [4] high natural frequency of the cross-member owing to enclosed box cross-section with high rigidity and low weight [5] plastic model ship with elliptical lines plan and 9 ribs [6] capacitive acceleration sensor with measuring amplifier, freely positionable [7] vibration exciter with power amplifier and function generator: sinusoidal, triangular or rectangular signal [8] possible to display measured values on an oscilloscope (not included) 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
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