公开(公告)号：US20190064014A1

公开(公告)日：2019-02-28

申请号：US16172342

申请日：2018-10-26

Applicant: DALIAN UNIVERSITY OF TECHNOLOGY

Inventor： Qingchao Sun ,  Bo YUAN ,  Wei SUN ,  Weiqiang HUANG

IPC: G01L1/25 ,  G01N3/12 ,  G01N29/265

Abstract: The present invention discloses an interface ultrasonic reflectivity-pressure relation curve establishment method and a loading testbed. The loading testbed comprises a force displayer, a control terminal, an oscilloscope, an immersion ultrasonic transducer, a large cylinder, a small cylinder, an upper panel, a movable plate, a force sensor, a lower panel, an ultrasonic transceiver and a small cylinder connecting plate. Compared with the existing schemes, the interface ultrasonic reflectivity-pressure relation curve establishment method and the loading testbed provided by the present invention can construct a more accurate ultrasonic reflectivity-pressure relation curve, and are high in detection precision

公开(公告)号：US20200278240A1

公开(公告)日：2020-09-03

申请号：US16606991

申请日：2018-02-07

Applicant: DALIAN UNIVERSITY OF TECHNOLOGY

Inventor： Qingchao SUN ,  Bo YUAN ,  Wei SUN ,  Jiecheng DING

IPC: G01H11/08 ,  G01L5/24

Abstract: The present invention discloses a piezoelectric patch-based real-time and high-precision bolt preload detection method and system. A piezoelectric patch is used as an ultrasonic excitation source and pasted on the head of a bolt, and the high-precision fitting relationship between the ultrasonic change of time-of-flight and the bolt preload is established according to the law of the ultrasonic change of time-of-flight of single echo with the stress so that the real-time detection of the bolt preload is realized by using the mathematical relationship. Compared with the previous method using ultrasonic probes, the present invention eliminates the error caused by the uncertainty of couplant thickness and further improves the measurement precision by using the change of time-of-flight of single echo. Meanwhile, the low-error rate measurement of the bolt preload is realized at a low cost and without affecting the structural performance.