公开(公告)号：US10393707B2

公开(公告)日：2019-08-27

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: G01N29/14 ,  G01N29/44

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.