公开(公告)号：US10746642B2

公开(公告)日：2020-08-18

申请号：US16338872

申请日：2017-09-08

Applicant: DALIAN UNIVERSITY OF TECHNOLOGY

Inventor： Qingchao Sun ,  Bao Zhang ,  Chuanhua Wang ,  Wei Sun ,  Yue Ma

IPC: G01N3/24 ,  G05B19/04

Abstract: A closed-loop control method based on a testing machine for accurately controlling the loosening of a bolt transverse load is disclosed. The testing machine for accurately controlling the loosening of the transverse load comprises a load generating motor, a load transfer mechanism, a load control motor and a load control mechanism. The control method of the present invention controls the load generating motor to drive the load transfer mechanism based on control commands, displacement signals collected by the displacement sensor and force signals collected by an S-shaped column type pressure sensor. The testing machine for the looseness of the bolt transverse load is essential in the aspect of exploring a looseness law of a bolt, and can be used to simulate load bearing conditions of the bolt. However, under the condition that some bolts bear constant force load transversely, the testing machine is not used or is inaccurate. The control method of the present invention can accurately control the load transverse load to be stable, especially can ensure constant transverse load and can also simulate the transverse load bearing situation of the bolt more accurately and more comprehensively.