Adaptive Electromagnetic Torsional Tuned Vibration Absorber and its Application in Rotating Equipment

Abstract

Rotating equipment is susceptible to torsional vibrations whenever the RPM of the rotating equipment matches one of the torsional natural frequencies. For rotating equipment running at constant RPM, it is easy to control and mitigate the torsional vibrations, but in applications where the RPM is no longer a constant and varies widely or natural frequencies are changing: there is a need for a wide range vibration reduction device. In this paper, a translational adaptive electromagnetic tuned vibration absorber (ETVA) is described where its natural frequency is varied using electronics. The ETVA is modeled and its simulation results correlate very well with experimental results. Later, this concept is used to develop a torsional tuned vibration absorber (TTVA) device. The electromagnetic TTVA can be attached to rotating equipment to control torsional vibrations. The electromagnetic TTVA adapts itself and controls the torsional vibrations as and when the RPM varies. Here in this paper, the rotating equipment and the electromagnetic TTVA are modeled. Analysis results indicate that the torsional vibration of rotating equipment can be easily controlled using this newly developed electromagnetic TTVA.

Adaptive Torsional Tuned Vibration Absorber for Rotary Equipment

“…The studs and nuts were removed from the ATTVA, and the springs/voice coils were set free to move axially ( Figure 15). Utilizing the same concept of capacitance shunting that was proven experimentally in the translational model in [27], the ATTVA was tested in two configurations:…”

“…All the above research work focused on active electromagnets, which need a continuous supply of electrical power. A recent SDOF translational electromechanical tuned vibration absorber (ETVA) was introduced by [27,28], which is comprised of a voice coil, a single degree of freedom mass-spring system, and an RLC circuit. The natural frequency of the ETVA was varied by controlling the capacitance in the RLC circuit.…”

Tunable electromagnetic resonant shunt using pulse-width modulation

“…Recently, programmable digital shunts have also been proposed [25,26]. For electromagnetic transduction, some tunable DVAs, with a variable capacitance to change their apparent stiffness, where proposed in [27,28]. However, it seems that no contribution on adaptive resonant electromagnetic shunts has been proposed since the pioneering work [20].…”