Effects of gravity of centrifugal pendulum vibration absorber on its damping performance

2021 ◽  
Vol 1 (1) ◽  
pp. 1
Author(s):  
Yi Zhang ◽  
Guangqiang Wu ◽  
Guoqiang Zhao
Keyword(s):  
Vibration Absorber ◽  
Centrifugal Pendulum Vibration Absorber

Vibration Mode Structure of Cyclically Symmetric Centrifugal Pendulum Vibration Absorber Systems

2012 ◽  
Author(s):  
Chengzhi Shi ◽  
Robert G. Parker
Keyword(s):  
Degree Of Freedom ◽  
Vibration Absorber ◽  
Vibration Modes ◽  
Rotational Degree ◽  
Cyclic Symmetry ◽  
Mode Structure ◽  
Vibration Properties ◽  
Centrifugal Pendulum Vibration Absorber ◽  
Gyroscopic Effects ◽  
Modal Vibration

This work develops an analytical model of centrifugal pendulum vibration absorber systems with equally-spaced, identical absorbers and uses it to investigate the structure of the modal vibration properties. The planar model admits two translational and one rotational degree-of-freedom for the rotor and a single arclength degree-of-freedom for each absorber. The gyroscopic effects from rotor rotation are taken into account. Examination of the associated eigenvalue problem reveals well-defined structure of the vibration modes resulting from the cyclic symmetry of the absorbers. The vibration modes are classified into rotational, translational, and absorber modes. Characteristics of each mode type are analytically proved.

Effects of Nonlinearities and Damping on the Dynamic Response of a Centrifugal Pendulum Vibration Absorber

1992 ◽  
Vol 114 (3) ◽  
pp. 305-311 ◽  
Author(s):  
M. Sharif-Bakhtiar ◽  
S. W. Shaw
Keyword(s):  
Dynamic Response ◽  
Resonance Frequency ◽  
Equations Of Motion ◽  
Nonlinear Effects ◽  
Linear Analysis ◽  
Vibration Absorber ◽  
Stable Steady State ◽  
Primary System ◽  
Response Curves ◽  
Centrifugal Pendulum Vibration Absorber

The nonlinear dynamic response of a centrifugal pendulum vibration absorber with damping in both the primary system and the pendulum is analyzed using the methods of harmonic balance and Floquet theory. Periodic solutions are approximated by the first harmonic of the response and it is shown that for low and moderate response amplitudes the resulting frequency response curves agree well with results from simulations of the full nonlinear equations of motion. Particular attention is paid to the response at the anti-resonance frequency, that is, the operating frequency for which the absorber is tuned. Cases are demonstrated for which there exists more than one stable steady-state periodic motion of the system at the anti-resonance frequency; this particular property of the system is due to nonlinear effects and cannot be captured through the traditional linear analysis. Furthermore, it is shown that for certain ranges of parameter values the only stable periodic response of the system at the anti-resonance frequency is one of large amplitude, and it cannot be predicted by linear analysis. The effects of system parameters on the shifting of the anti-resonance frequency and on the corresponding carrier amplitude are also considered.

Insights on Centrifugal Pendulum Vibration Absorber: Part Two — Behaviour of a FWD Powertrain With a CPVA on its Clutch’s Flange

2013 ◽  
Author(s):  
Vinícius G. S. Simionatto ◽  
Hugo H. Miyasato ◽  
Milton Dias Júnior
Keyword(s):  
Engine Speed ◽  
Linear Analysis ◽  
Front Wheel ◽  
Vibration Absorber ◽  
Wheel Drive ◽  
Centrifugal Pendulum Vibration Absorber ◽  
Nonlinear Character ◽  
Tuning Frequency ◽  
Gear Rattle ◽  
Inner Parts

This work is the second and last part of a study whose aim is to present the vibrational aspects of a system with a centrifugal pendulum vibration absorber (i.e. CPVA). The aim of this work, specifically, is to develop a mathematical model of a front engine–front wheel drive powertrain to study gear rattle phenomenon, and to install on its clutch disk’s flange a CPVA in order to understand what are the effects of this device on the dynamics of this system. Results from the linear analysis show that the eigenfrequencies of the system vary with the engine speed. They oscillate between the eigenvalues of the system without the CPVA and, for regions away from the tuning frequency of the pendulum, which is the second order of rotation of the engine, the behaviour of the system remains the same. However, near the tuning frequency of the pendulum, the behaviour of the system varies very much, and the amplitude of vibration of the gearbox’s inner parts diminishes. Simulations of the powertrain without and with the nonlinear model of the studied device show that its presence reduces dramatically the vibrations inside the gearbox and its nonlinear character does not influence the effectiveness of this solution.

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