Interrelation of frequency, acceleration and vibration displacement

Question

Shaker system for sinusoidal vibration tests perfomance has the following specification items: frequency, amplitude and acceleration. However, acceleration is determined by first two parameters values… Could you please tell me which parameters are primary for the shaker control system in the case of sinusoidal vibration tests? For instance, we have set acceleration and frequency – will the amplitude value be adjusted automatically in accordance with these parameters values? Am I right to think that at a load below 3kg acceleration up to 89g will be provided for all the frequency range specified (2-7000 Hz)?

Answer

Force (impelling force) is the primary characteristics – it determines the maximum acceleration value of the shaker system. For all test types perfomance it is necessary to determine maximum profile acceleration and tested object weight values. In the case if these values are not available for a certain shaker system, it will be necessary to set the force value individually for each of the test profiles. Displacement amplitude is determined by shaker system structure (the displacement amplitude value of the shaker system can be increased by the manufacturer for additional cost). Frequency range is also determined by shaker system model – the bigger the shaker system is, the higher is its upper frequency limit. Bottom frequency limit value depends on the particular amplifier used.

At the frequency of 2 Hz it will be impossible to achieve value of 89g because of too high displacement value (over 5 m). At the frequency of 42 Hz the displacement value will be 12.5 mm.
See also: Interrelation of acceleration, speed and displacemenr for sinusoidal vibration tests perfomance.

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