Abstract: The use of centrifugal pendulum for dynamic vibration absorber design is a proven method for reducing undesired torsional vibrations in rotating systems. These devices are in use for many years, most commonly in light aircraft engines, helicopter blade rotors etc. These devices have also been reported for reduction of rectilinear vibrations. Pendulum type dynamic vibration absorbers use impact forces for effective reduction of rectilinear vibrations describing modelling method and transient state analysis in view of spring impact absorbers, floating impact absorbers and pendulum impact absorbers. Bond graph technique for modelling of single degree of freedom (SDOF) vibrating system excited by rotation unbalance at the sprung mass using a pendulum type dynamic vibration absorber is reported in the recent literature. This paper deals with the modelling and design procedure for a centrifugal pendulum type dynamic vibration absorber (CPVA) subjected to base excitation. It presents a detailed analysis and experimental investigations of the effect of various parameters affecting the motion transmissibility of the sprung mass such as size of the pendulum mass, eccentricity of the pendulum pivot with respect to axis of rotation of the pendulum assembly, mass ratio (ratio of the pendulum mass to the sprung mass), gear ratio (the ratio of the pendulum rotational frequency to the excitation frequency) and the frequency ratio (the ratio of the excitation frequency to the natural frequency of the SDOF system). It has been proved that the CPVA is effective in reduction of motion transmissibility of the sprung mass of the SDOF system with the proper selection of the affecting parameters.

Keywords: Centrifugal Pendulum Vibration Absorber (CPVA), Motion transmissibility, single degree of freedom SDOF, Mass ratio, Gear ratio, Frequency ratio.

| DOI: 10.17148/IARJSET.2021.8626A