Abstract: The vibration of band-saw caused by Lever-weight strain system was studied Results tested by 2034 type frequency analyzer showed, That the vibration spectrum of band-saw is a complex periodic signal discrete frequency spectrum, which consists of the repeated addition by a series of sinple harmonic vibration. At the same time, The investigation indicated that the lever-weight strain system of band-saw is different from "Weighing balancer" and can not reach "static balance" while produce a periodic forced vibration under the parametric excitation force of wheels. The interactions between the parametric excitation of the band-saw wheels and the displacement excitation of the leverweight system are critical causes for periodic vibrating and changing tensile force of band-saw.

Key words: Lever-weight strain sysem, Vibration characteristic, Parametric excitation, Displacement excitation, Complex periodic signal discrete frequency spectrum