公开(公告)号：US20180321194A1

公开(公告)日：2018-11-08

申请号：US15585583

申请日：2017-05-03

Applicant: HIWIN TECHNOLOGIES CORP.

Inventor： Chih-Chun CHENG ,  Ping-Chun TSAI ,  Wen-Nan CHENG ,  Yu-Hsin KUO ,  Yin-Chun CHENG ,  Hsi-Hsun CHENG ,  Kuan-Te YU

IPC: G01N29/12 ,  G01N29/44

CPC classification number: G01N29/4427 ,  G01N29/14 ,  G01N29/4472 ,  G01N2291/2623

Abstract: A method for estimating a variation in a preload applied to a linear guideway of a machine tool includes steps of: a) obtaining, via each of vibration sensors, first and second vibration signals that are generated according to detection of vibration of a table disposed on the linear guideway respectively at first and second time instants; b) determining, via the computation module, first and second natural frequencies based on a theoretical mode shape and respectively on the first and second vibration signals; and c) determining, via the computation module, the variation in the preload based on the first and second natural frequencies.