Title:
METHOD FOR MEASURING PRE-TIGHTENING FORCE OF BOLT ON BASIS OF ECHO SIGNALS IN DIFFERENT MODES
Document Type and Number:
WIPO Patent Application WO/2024/045432
Kind Code:
A1
Abstract:
A method for measuring a pre-tightening force of a bolt on the basis of echo signals in different modes. The method comprises the following steps: S1, selecting a reference bolt for a calibration experiment; S2, performing the pre-tightening force calibration experiment on the reference bolt, so as to obtain, from ultrasonic echo signals, ratios of a transition time of mode A to a transition time of mode B when the reference bolt is subjected to different pre-tightening forces; S3, performing linear fitting to obtain a function relationship between pre-tightening forces of the bolt and the ratios of the transition time of mode A to the transition time of mode B; S4, performing ultrasonic pre-tightening force measurement on a bolt to be subjected to measurement, so as to obtain, from an ultrasonic echo signal of the bolt to be subjected to measurement, a ratio of the transition time of mode A to the transition time of mode B; and S5, according to the function relationship between pre-tightening forces of the bolt and the ratios of the transition time of mode A to the transition time of mode B, and the ratio of the transition time of mode A to the transition time of mode B in the ultrasonic echo signal of the bolt to be subjected to measurement, calculating a pre-tightening force of the bolt to be subjected to measurement. In the method, simply by using single longitudinal waves, a pre-tightening force can be measured for a fastened bolt when a bolt length and an initial transition time are unknown.
Inventors:
GOU GUOQING (CN)
YAN GUANGLONG (CN)
QIU FEIFEI (CN)
CHEN BING (CN)
QIN SHUZHI (CN)
LIU HENG (CN)
ZHANG CHENHAO (CN)
ZHU ZHONGYIN (CN)
GUO MOCHENG (CN)
YAN GUANGLONG (CN)
QIU FEIFEI (CN)
CHEN BING (CN)
QIN SHUZHI (CN)
LIU HENG (CN)
ZHANG CHENHAO (CN)
ZHU ZHONGYIN (CN)
GUO MOCHENG (CN)
Application Number:
PCT/CN2022/140693
Publication Date:
March 07, 2024
Filing Date:
December 21, 2022
Export Citation:
Assignee:
UNIV SOUTHWEST JIAOTONG (CN)
International Classes:
G01L5/24
Domestic Patent References:
| WO2005121773A1 | 2005-12-22 |
Foreign References:
| CN115389087A | 2022-11-25 | |||
| CN112461429A | 2021-03-09 | |||
| CN114459648A | 2022-05-10 | |||
| CN112033597A | 2020-12-04 | |||
| JPH07253368A | 1995-10-03 | |||
| JPH1096673A | 1998-04-14 |
Other References:
MOCHENG GUO, CHENBING, ZHUZHONGYIN, QIUFEIFEI: "Ultrasonic Testing of Axial Stress of Bolt Under the Influence of Temperature", NON-DESTRUCTIVE TESTING, SHANG HAI CAI LIAO YAN JIU SUO, CN, vol. 44, no. 3, 10 March 2022 (2022-03-10), CN , pages 45 - 48, 67, XP093143410, ISSN: 1000-6656, DOI: 10.11973/wsjc202203010
Attorney, Agent or Firm:
CHENGDU ZHONGHENG ZHIHE PATENT AGENT FIRM (GENERAL PARTNERSHIP) (CN)
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