Vibration Analysis

Elite Consulting undertakes theoretical vibration analysis (also called Dynamic Analysis) to determine the likely amplitude of vibration under certain conditions and the resulting stresses.

The first step is to conduct a Modal Analysis to find the natural frequencies and mode shapes of vibration. Then these results are used to find the amplitudes by appling a forcing function and damping to the system and conducting a  forced vibration or 'dynamic' analysis. Often the stress results are used as the basis of a fatigue analysis.

We undertake 4 different types of Dynamic Analysis:-

Dynamic Frequency

This simulates a sweep through a frequency range, where the input may not be uniform within that range. Usually this is done in 2 stages - an initial stage to find the peak response frequencies and then a second stage to examine the amplitudes and stresses at the peaks in more detail.

Dynamic Time

This simulates a system that is subject to a specified time-related input, such as a half-sine wave (though the input could be of any shape). In common parlance this is often call a 'shock'. This is also usually done in 2 stages - an initial stage to find the times at which peak response occurs and then a second stage to examine the amplitudes and stresses at the peaks in more detail.

Example - Initial Dynamic Time Result

Dynamic Random

This type of analysis is undertaken where the input is random; often described by a Power Spectral Density (PSD). It is a common type of analysis in the automotive and aerospace industries, though it can be appropriate in other industries too.

Dynamic Shock

This term is used to describe a special kind of analysis that is usually used to analyse earthquake-like situations. It uses the frequency-response spectrum method to produce a result.

If you wish to discuss Vibration Analysis and which kind of input and analysis would be most approriate in your situation, then please contact us.


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