Where the vibration problem involves self-excited chatter instability, or resonant magnification, we carry out modal analysis to identify the deflection modes associated with the offending resonance.
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Modal Analysis
Modal analysis is an experimental technique that is used to identify the mode shape of a structure as it vibrates at resonance.
It is an essential process if there is a requirement to understand the resonant behaviour of a structure so that steps can be taken to improve it.
We have, over the years, carried out many hundred such modal analyses on structures ranging in size from as small as a boring bar to as large as an overhead gantry crane. We have at our disposal a range of shakers and hammers to excite the structure under test and can often complete the data collection over the course of just a few hours thus keeping down-time to a minimum.
Troubleshooting using Modal Analysis
When troubleshooting problems of vibration, our engineers frequently discover that while a troublesome vibration can be traced to a specific exciter such as a gear mesh or bearing “defect”, there is nothing abnormal about the condition of that exciter. The problem, in these situations, is often caused as a result of resonant amplification of the vibration in which, at certain operating speeds, the “normal” vibrations are magnified by the structural resonances to abnormal levels.
In these situations, simply replacing the gear or the bearing that is the source of the vibration will not provide a solution. Instead, it is essential that modal analysis be carried out in order to identify the mode shapes so that the areas that require stiffening or damping can be readily pinpointed.
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UK & International Enquiries
Farrat Isolevel Ltd, Balmoral Road, Altrincham, Greater Manchester, WA15 8HJ, United Kingdom.
Telephone: +44 161 924 1600
Email: [email protected]
Monday – Thursday: 08:30 to 17:00
Friday: 08:30 to 16:00