High Frequency Vibration Test Stand ES-30.pdf

DO-160 Simulation Transport Vibration Laboratory Testing Equipment

Working Principle of Vibration Shaker

The working principle of vibration tester is similar to a loudspeaker whereby electrical conductor is moved by the action of electromagnetic force in the magnetic field. The force to accelerate the moving part is generated by the balance between driving current and magnetic flux. Therefore, by controlling the driving current, one can control the vibration generator.

The maximum acceleration level of the electromagnetic vibration exciter is determined by the maximum current and the loading. At low frequency, displacement of moving part is restricted such that the acceleration will not reach high level. The resonance frequency of the moving element is set higher than the upper limit of the frequency range.

The performance of vibration generator can be reflected by the chart that displays the maximum acceleration under different frequencies. By using a log-log plot, the restriction of displacement can be expressed by a straight line with slope of 6 dB/octave.

high frequency vibration shaker Features:
1. Rugged suspension system and linear motion guiding, strong carrying capacity, good guiding functions, high stability.
2. Load center airbag with high static stiffness and low dynamic stiffness, strong carrying capacity, perfect performance on amplitude variation.
3. High efficiency D class power switching, 3-sigma peak current, low power consumption and minimum harmonic distortion.
4. Quick self-diagnosis with safety interlock, high safety reliability.
5. Airbag shock isolation device for vibration platform without the need of additional. foundation, perfect reproduction of vibrational wave and reduction in vibration transmittance.
6. Horizontal and vertical expansion platforms for different applications.
7. Simple controller operation.

The general formula for calculating force vector of vibration systems:

Force(N) = Mass(kg) x Accelration( m/s² or g) x1.3 safety facotry F=MA*1.3
Mass = Shaker Armature + device under test + fixture (vertical table/slip table with driver bar)

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