An indirect torsional vibration receptance measurement method for shaft structures

Structural Modifications for Torsional Vibration Control of Shafting Systems Based on Torsional Receptances

“…A good FE model of auxiliary structure must be established, which is fairly easy, given its simple geometric shape. The whole derivation details are given in Lv et al 's paper [22].…”

“…Firstly, the force analysis for torsional vibration is done on the OD structure, and the shaft system receptances at point are given in [22] by…”

“…However, it should be noted that, perhaps partly owing to difficulties in accurately measuring torsional FRFs, inverse structural dynamics problems of rotating machineries based on measured data (especially for rotational receptance) nearly have never been studied before [22].…”

“…Although many researchers have put forward a number of methods for measuring transfer functions for rotational degrees of freedom (DoFs); for example, Mottershead et al [23] proposed one indirect method based on T-block for obtaining rotational receptances, the progress in measuring torsional transfer functions in shaft systems is still very limited [23][24][25][26][27], and nearly none of these papers are about torsional vibration measurement of shaft structures. Recently, Lv et al [22] put forward an indirect method to measure the torsional receptance. The method was implemented by using a T-shaped simple auxiliary structure attached to one end of the shaft system, and the torsional system receptances could be obtained accurately through combining the auxiliary structure's finite element model (FEM) and test data of the whole structure.…”

Contribution and Perspectives of New Flexible Shaft Coupling Types – Pneumatic Couplings

“…Based on the general characteristics of flexible shaft couplings, it is valid to state that, besides adjusting the axial, radial and angle misalignment of shafts, these devices serve as a very efficient tools for restricting the occurrence of resonance in a range of operating speeds in TOMS. In other words, suitably selected flexible shaft couplings, as described by several researchers [5,6,7,8], represent simple and relatively cheap devices for restricting the occurrence of resonance in the operating speed range and reducing the dynamic torsional load of all elements in the system. Usually, this involves shifting the natural frequency of torsional oscillations of the system and, consequently, critical revolutions, from individual harmonic components of torque load into the area of lower-frequency revolutions.…”