Abstract
This paper analyzes the natural vibration of a single carriage of linear roller guides. The carriage was excited by an impulse hammer through an added mass and its response was detected by an accelerometer. The acceleration was analyzed by an FFT analyzer. The linear roller guide has three rigid body modes. The motion directions of these modes are roll, pitch and radial direction. The natural frequencies and compliances were measured changing the added mass. The mathematical model of carriage was proposed for identifying the natural frequencies, compliances and damping ratios of each mode. This mathematical model includes the roller model. The contact stiffness between roller and raceway is modeled as linear spring. Moreover, assuming the vibration damping is caused by interaction of roller and raceway, the damping force is modeled. This mathematical model can calculate the natural frequencies and compliances well. And the damping capacity of carriage is evaluated as damping ratios of each mode.
