2. Sizing of tuned dampers
Tuning a damper presupposes having identified a dangerous excitation whose pulsation ω is equal to a natural pulsation of the system without a damper. The torsional model used for the free vibration study comprises n disks numbered from 1 to n. Rigidities and moments of inertia have been reduced to the rotational speed of the shaft on which the damper has been placed. The Holzer sequence (modal deformation) associated with the eigenmode of pulsation ω is defined by the n relative amplitudes ϕ
i
. In this case, we set ϕ
1
= 1. If Ω represents the average rotational speed of the shaft line for which the preceding resonance phenomenon takes place, then :
It is then possible...
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Sizing of tuned dampers
References
Available software (non-exhaustive list)
There are few standard software packages available. Most of the time, it's dedicated software, depending on the user.
VIBMOT - software for calculating eigenmodes and forced torsional vibrations. GLCS company.
XLTRC Program - Turbomachinery Laboratory Texas ASM University
ACORD
ITECH
...Manufacturers-Suppliers (non-exhaustive list)
Customized shafts/Test benches
LUFKIN France SA (COMELOR)
D2T
Shock absorbers
AUBECQ-AUXI
Maintenance/Measurement
SAYA
DBVIB CONSULTING
IMPEDANCE
...
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