Dynamic Vibration Absorber System Research Articles

Dynamic vibration absorber system excited by a rotating imbalance. (3rd report Effect of Coulomb friction both in the main system and in the absorber)

Dynamic vibration absorber system excited by a rotating imbalance. (3rd report Effect of Coulomb friction both in the main system and in the absorber)

Effect of Coulomb friction on a dynamic vibration absorber system with harmonic base excitation. 2nd report Coulomb friction in the main system.

This report presents the effect of Coulomb friction combined with viscous damping in the main system, to which a viscous-damped dynamic vibration absorber is attached. The main system is subjected to harmonic base excitation, and in the analysis, a similar process is used to that explained in the previous report. The conclusions are : -(1) The numerical results of the analytical solution coincide very well with those of digital simulation. (2) Coulomb friction coexisting with the viscous damping in the main system, with a dynamic vibration absorber tuned so as to suppress the resonant response of the system in considering only viscous damping, reduces the maximum amplitudes of the main mass. The features of two equi-height maximums in the resonance curve vanish. (3) Since conventional expressions for the optimum tuning of the absorber do not fit in this case, other new empirical formulae are recommended.

Effect of Coulomb friction on a dynamic vibration absorber system with harmonic base excitation. (1st report, Coulomb friction in the absorber)

The effect of Coulomb friction combined with viscous damping in a dynamic vibration absorber attached to the primary system with viscous damping subjected to the exciting force P0 sin ωt has already been clarified. This study is devoted itself to the same system as the above in another case, in which the primary system is subjected to the harmonic base excitation, u0 sin ωt. The analysis may be proceeded by replacing the amplitude of exciting force P0 in the previous report by a new apparent force, u0√(k21+(c1ω)2). The results of the numerical analysis are compared with those of the digital simulation (HITAC DDS III) with good coincidence. And, it is conclude that the existence of Coulomb friction in the absorber increases the amplitude of main mass and limits the non-stop motion within the narrow range of frequency. A set of empirical formulae for determining the optimum tuning and damping is constructed for the practical use.

Dynamic vibration absorber system excited by a rotating unbalance. 2nd report Effect of Coulomb friction in the main system.

This report presents the effect of Coulomb friction combined with viscous damping in the main system to which a viscous-damped dynamic vibration absorber is attached. The main mass is excited by a rotating unbalance, and in the analysis, a similar process is used to that explained in the previous report(3). Thus, the conclusions are : - (1) The numerical results of analytical solution coincide very well with those of digital simulation. (2) Coulomb friction coexisting with the viscous damping in the main system, with a dynamic vibration absorber tuned so as to suppress the resonant response of the system in considering only viscous damping, reduces the maximum amplitudes of the main mass. The features of two equi-height maximums in the resonance curve vanish. (3) By reason that conventional expressions for the optimum tuning of the absorber do not fit in this case, other new empirical formulae are recommended.

Dynamic Vibration Absorber System Excited by a Rotating Unbalance : 1st Report, Effect of Coulomb Friction in the Absorber

Dynamic Vibration Absorber System Excited by a Rotating Unbalance : 1st Report, Effect of Coulomb Friction in the Absorber