Study on Vibration Damping Performance of Composite Crankshaft Torsional Vibration Damper

Abstract

In order to reduce the crankshaft vibration’s impact on the performance and working life of the vehicle engines, using silicone oil and damping properties of rubber, designed a silicone, rubber compound crankshaft vibration damper that required the actual demand. Determined the silicone oil shock absorber and rubber vibration isolator in the main performance parameters of the design process; completed the main structure size design; calculated the silicone oil shock absorber in the motor rated power as 92 kw, the rated speed as 2200 r/min, the torque value and excitation frequency and crankshaft maximum amplitude under the condition that the crankshaft excitation frequency as 1927.2 r/s. Determined the damping value of the optimum damping point during working time was Cd=93.66 Nms/rad, drew the crankshaft resonance curve of silicone oil shock absorber, calculated torque value frequency and the maximum crankshaft amplitude of the rubber vibration isolator under specific working condition, determined the optimum damping point and damping value as Cr=0.3158 Nms/rad while vibration isolator was working, mapped crankshaft resonance curve of the rubber vibration isolator; calculated the optimum damping points of the combined crankshaft torsional vibration, constructed the resonance frequency test bed of the compound torsion damper, inspected resonance frequency value and its corresponding swing value. It has been proved that after installing the compound torsion damper, the amplitude value of the crankshaft reduced about 81%, much lower than that before installation, which had significant effect, and meeted the design requirements.