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Design of Centrifugal Pendulum Vibration Absorber to Reduce the Axial Vibration of Rotating Shafts for Multiple Orders
Journal Article
06-13-02-0007
ISSN: 1946-3995, e-ISSN: 1946-4002
Sector:
Citation:
Rao, M. and Sujatha, C., "Design of Centrifugal Pendulum Vibration Absorber to Reduce the Axial Vibration of Rotating Shafts for Multiple Orders," SAE Int. J. Passeng. Cars - Mech. Syst. 13(2):81-105, 2020, https://doi.org/10.4271/06-13-02-0007.
Language:
English
Abstract:
Centrifugal Pendulum Vibration Absorbers (CPVA) are used to reduce the torsional
fluctuation of rotating shafts at a certain vibration order. The concept can
also be used to reduce the axial or longitudinal vibration of rotating shafts at
the desired order. The axial vibration of driveshafts mainly at combustion
order, i.e., 2× rpm for four-cylinder engines, is the reason for the generation
of a high level of suspension forces and eventually increased levels of noise
and vibration inside the passenger compartment of rear-wheel-drive vehicles. The
axial vibration of a shaft at multiple orders (1× rpm and 2× rpm) also increases
at higher levels of unavoidable parallel or angular misalignment. The vibration
at multiple orders needs to be reduced in the vehicle driveline system in
rear-wheel-drive vehicles to minimize the noise and vibration and provide
enhanced comfort. A single pendulum vibration absorber can attenuate only one
vibration order of the rotating shaft, and multiple absorbers are required to
reduce the vibration at different orders. The design strategy to reduce the
first- and second-order axial vibration, by using circular path pendulum
absorbers, is explained in this work. The generated torsional vibration at the
second order due to first-order oscillations of the pendulum is counteracted by
the design of an additional CPVA. Torsional springs are used at the pivot joints
of all pendulum absorbers to counteract the excessive oscillations due to
braking and gravitational effects at low speeds. The additional advantage of
introducing the springs and their influence on the natural frequencies is
analyzed. The second-order equations of motion of the absorbers are solved
analytically using the method of multiple timescales with a two-term
approximation. The stability characteristics of the solutions are analyzed at
the excitation frequencies and different dynamic axial force levels. Analytical
results are compared with numerical simulation of a complete set of nonlinear
equations. The performance of centrifugal pendulum-type axial vibration absorber
(CPAVA) in reducing the predominant second-order longitudinal vibration at
differential and passenger compartment is experimentally demonstrated by using
CPAVA at the differential flange of a rear-wheel-drive vehicle. The proposed
methodology helps in designing the CPAVAs for attenuating the axial vibration at
multiple higher orders of rotating shafts.