Torsional Vibration Analysis

Rotating machinery goes through torsional oscillations while they are operated; this can cause wearing or tooth failure of gears, key failure, or in extreme cases, even shaft breakage. This often happens silently or without perceivable increase of lateral vibrations. Gear noise may be heard in geared systems; this could be a warning for potential huge torsional oscillations. It is critical that natural torsional frequencies are adequately separated from excitation frequencies.

Torsional vibration analysis is conducted to verify calculations made earlier, or to establish separation margin and torsional natural frequencies. In case there is discovery of a torsional vibration issue, it is possible that you may need to make modifications in the system. Using the software, the team can recommend solutions and assess suggestions by the customer. It may be necessary to alter the flywheel inertia, the torsion rigidity of the coupling and so on, to eliminate torsional resonance.

Benefits of Torsional Vibration Analysis

Torsional vibration analysis helps in ensuring that all equipment and machinery is reliable and safe.
The software identifies inter-component interaction, which aids in evaluating the system and its functionality
Campbell diagram can be generated to pinpoint the precise resonance point
Stress analysis helps in evaluation of the powertrain more accurately against failure of torsional timbre
Torsional vibration measurements help engineers in understanding the intricacies of the rotating machinery or equipment, allowing them to fix problems and certify its performance.

How is Torsional Analysis Done at Technomax?

The Technomax team conducts torsional analysis at starting, shutdown, and across multiple operational conditions. They use a torsiograph, laser vibrometer or encoder to help establish the angular oscillation and velocity.
They use time waveforms to record maximum torque during events like forced shutdown, synchronous startup etc.; these measurements are then compared to the coupling’s rating.
Adequate sampling rates are used to record the data, and FFT is used to check the signal’s frequency content.
Next, they change the speed of operation and create a waterfall plot to ascertain the TNFs. This can be performed during an unloaded coast down test or sluggish startup.

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