New evaluation method of fastening force of a bolt focusing on instantaneous frequency of transmitted ultrasonic pulse

2018 ◽  
Vol 2018 (0) ◽  
pp. 609
Author(s):  
Kentaro KAMEDA ◽  
Takumi INOUE ◽  
Ren KADOWAKI ◽  
Kazuhisa OMURA
Keyword(s):  
Instantaneous Frequency ◽  
Evaluation Method ◽  
Ultrasonic Pulse

scholarly journals 3D Internal Visualization of Concrete Structure Using Multifaceted Data for Ultrasonic Array Pulse-Echo Tomography

Sensors ◽  
2021 ◽  
Vol 21 (19) ◽  
pp. 6681
Author(s):  
Hungjoo Kwon ◽  
Changbin Joh ◽  
Won Jong Chin
Keyword(s):  
Evaluation Method ◽  
Ultrasonic Pulse ◽  
Evaluation Tool ◽  
Limited Budget ◽  
Pulse Peak ◽  
Synthetic Aperture Focusing ◽  
Synthetic Aperture Focusing Technique ◽  
Pulse Echo ◽  
Structure Evaluation ◽  
Non Destructive

This research proposes a 3D internal visualization using ultrasonic pulse-echo tomography technique to evaluate accurately the state of concrete structures for their efficient maintenance within a limited budget. Synthetic aperture focusing technique (SAFT) is used as a post-processing algorithm to manipulate the data measured by the ultrasonic pulse-echo technique. Multifaceted measurements improve the weakness of the existing ultrasonic pulse-echo tomography technique that cannot identify the area beyond a reflector as well as the area located far away from measuring surfaces. The application of apodization factor, pulse peak delay calibration and elimination of trivial response not only complements the weaknesses of the SAFT algorithm but also improves the accuracy of the SAFT algorithm. The results show that the proposed method reduces the unnecessary surface noise and improves the expressiveness of the reflector’s boundaries on the resulting images. It is expected that the proposed 3D internal visualization technique will provide a useful non-destructive evaluation tool in combination with another structure evaluation method.

B-13 Development of Evaluation method of slacking Bolt Using Instantaneous Frequency of Ultrasound

2016 ◽  
Vol 2016.69 (0) ◽  
pp. 63-64
Author(s):  
Kenta MORI ◽  
Takumi INOUE ◽  
Ren KADOWAKI ◽  
Kazuhisa OMURA
Keyword(s):  
Instantaneous Frequency ◽  
Evaluation Method

Diagnosis of bolt loosening using instantaneous frequency of ultrasonic pulse

2016 ◽  
Vol 2016 (0) ◽  
pp. J0420402
Author(s):  
Kenta MORI ◽  
Takumi INOUE ◽  
Ren KADOWAKI ◽  
Kazuhisa OMURA
Keyword(s):  
Instantaneous Frequency ◽  
Ultrasonic Pulse ◽  
Bolt Loosening
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