Minimization of transient torsional vibrations of synchronous motor-driven compressors

This paper presents a dual dynamic absorber to minimize the torsional transient vibrations exhibited during start-up of systems driven by synchronous motors. The dual dynamic absorber is two inertia rings connected , via spring-like material, to both the driver side (motor) and the driven side ( compressor ). The stiffness and inertia properties of the dual absorber are optimally tuned to match the torsional natural frequency of the system. A lumping technique is used to produce a dynamic model with nonlinear flexible coupling. The results of the basic model are verified using the results of previously published work on the modeling of nonlinear flexible couplings. The numerical results on the dual-dynamic-absorber show excellent reduction in the transient vibration amplitudes as well as noticeable reduction in the transient vibrations number of cycles.