Showing papers on "Dynamic Vibration Absorber published in 1974"

Improvement in Dynamic Characteristics of Automobile Suspension Systems Part II - Three-Mass System

Abstract: SUMMARY In a previous paper, [3] the random vibrations of simple linear models of automobile suspension were solved with respect to seat elasticity and human sensitivity to vibrations. The present study uses more realistic linear models taking into account the unsprung mass. Two configurations of masses are investigated: a two-mass system consisting of a sprung mass and an unsprung mass, and a three-mass system having an additional mass which acts as a vibration absorber. The gain in comfort obtained by lowering the natural frequency of the sprung mass is calculated for various two-mass and three-mass models along with other characteristics such as the dynamic tyre load, spring and damper forces and relative motion of the masses.

Tunable vibration absorber

Abstract: A vibration absorber includes an inertia mass having oppositely directed spaced apart pistons, each being disposed within an independent pressurizable cylindrical chamber which is rigidly attached to a vibrating body. The inertia mass moves back and forth in response to vibrations of the vibrating body, alternately compressing the pressurizable fluid within each chamber. Automatic adjusting means in one embodiment keeps the inertia mass reciprocating substantially evenly about a central point whereby the restoring force on each piston face at the end of each stroke is always about the same. A pressure regulator keeps equal minimum pressures within the chambers. The magnitude of the pressure in conjunction with the mean volume of the pressurized chambers determines the natural period of the reciprocating motion. The pressure can be set so that the device may absorb a wide band of vibrating frequencies of the vibrating body.