公开(公告)号：US20180120262A1

公开(公告)日：2018-05-03

申请号：US15384228

申请日：2016-12-19

Applicant: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE

Inventor： Chung-Yu TAI ,  Chen-Yu KAI ,  Ta-Jen PENG ,  Yi-Hsuan CHEN

IPC: G01N29/04 ,  G01N29/24

CPC classification number: G01N29/041 ,  G01N29/07 ,  G01N29/2412 ,  G01N29/2418 ,  G01N2291/02827

Abstract: A non-contact dynamic stiffness measurement system includes a base, a test bar, an exciter, a force sensor, a laser Doppler velocimeter, and a controller. The force sensor is connected to the exciter and the base. The exciter is located between the test bar and the force sensor. The controller is electrically connected to the force sensor and the laser Doppler velocimeter. The test bar is detachably set in a holder of the main shaft under test. The exciter provides an electromagnetic force to the test bar. The force sensor measures the acting force of the exciter. The laser Doppler velocimeter provides a first laser beam and a second laser beam. The laser Doppler velocimeter measures a vibration response with reflected laser beams. The controller determines an equivalent main shaft stiffness value of the main shaft under test according to the acting force and the vibration response.