• Title/Summary/Keyword: ultrasonic inspection

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Measurement of Thickness and Position of the Surface using the Two Encoder Ultrasonic Sensors (두개의 엔코드 초음파 센서를 이용한 측정면의 두께 측정 및 위치 측정)

  • 강명철;장유신;김형국;배종일;이만형
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2002.04a
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    • pp.510-514
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    • 2002
  • The 3-dimensional measuring machine by using an ultrasonic sensor is used one of the NDE(Non Destructive Examination). It is applied to the inspection of pipelines, boreholes, pressure vessel and tank, and so on. In particular when a harsh environment prohibits the use of moving mechanical parts. The 3-dimensional measuring machine by using an ultrasonic sensor, which measure 1-dimensional information and 2-dimensional information simultaneously from a target of inspection, and then reembody 3-dimensional information. So we can find the situation in progress and predict remaining life and corrosion without destructive examination. It's a point of excellence that the 3-dimensional measuring machine is portable.

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Localization and Thickness Measurement of the Measuring Plane Using Ultrasonic Sensor and Encoder

  • Kim, Hyung-Kuk;Ahn, Hee-Tae;Lee, Dong-Hwal;Jeong, Seung-Gwon;Bae, Jong-Il
    • 제어로봇시스템학회:학술대회논문집
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    • 2001.10a
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    • pp.127.5-127
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    • 2001
  • The 3-dimensional measuring machine by using an ultrasonic sensor is used one of the NDE (Nondestructive Evaluation). It is applied to the inspection of pipelines, boreholes, pressure vessel and tank, and so on. On particular when a harsh environment prohibits the use of moving mechanical parts. The 3-dimensional measuring machine by using an ultrasonic sensor, which measure 1-dimensional information and 2-dimensional information simultaneously from a target of inspection, and then re construct 3-dimensional information. So we can find the situation in progress and predict remaining life and corrosion without destructive examination. It´s a point of excellence that the 3-dimensional measuring machine is portable.

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The Development of Automatic Inspection System for Flaw Detection in Welding Pipe (배관용접부 결함검사 자동화 시스템 개발)

  • Yoon Sung-Un;Song Kyung-Seok;Cha Yong-Hun;Kim Jae-Yeol
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.15 no.2
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    • pp.87-92
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    • 2006
  • This paper supplements shortcoming of radioactivity check by detecting defect of SWP weld zone using ultrasonic wave. Manufacture 2 stage robot detection systems that can follow weld bead of SWP by method to detect weld defects of SWP that shape of weld bead is complex for this as quantitative. Also, through signal processing ultrasonic wave defect signal system of GUI environment that can grasp easily existence availability of defect because do videotex compose. Ultrasonic wave signal of weld defects develops artificial intelligence style sightseeing system to enhance pattern recognition of weld defects and the classification rate using neural net. Classification of weld defects that do fan Planar defect and that do volume defect of by classify.

Propose of New Ultrasonic Nondestructive Code Considering Discontinuity Position (불연속부의 위치를 고려한 초음파 비파괴 검사 규격의 개선안)

  • Jeong, Hwa-Young;Shin, Byoung-Chul;Jung, Beom-Seok;Lee, Chang-Moo
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.3 no.4
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    • pp.173-178
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    • 1999
  • KS-code(KS B 0896) for nondestructive ultrasonic testing classifies the quality level by ratio of flaw size to plate thickness only. But stress distributions using verification(3 point bending test) show that location of the flaws is more important than the flaw size. So. KS-code should take the effect of flaw location for classifying the quality level of welded steel structures.

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Nondestructive Evaluation of plate structures using the Ultrasonic Transducer OPMT (OPMT 초음파 트랜스듀서를 이용한 평판구조 이상진단)

  • Kim, Yoon-Young;Cho, Seung-Hyun;Lee, Ju-Seung;Sun, Kyung-Ho
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2004.11a
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    • pp.423-427
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    • 2004
  • In this work, we propose a new ultrasonic damage inspection method in plate structures. The proposed method employs an OPMT (Orientation-adjustable Patch-type Magnetostrictive Transducer) in order to make the ultrasonic waves focused on the specific target point. For experiments, virtual grid points were set up at every 50 mm in an aluminum plate and two OPMTs were used for inspection. If there exists a crack in a plate, the reflected Lamb wave from the crack is measured in addition to the direct waves from the transmitting transducer to the receiving transducer.

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Development of Ultrasonic Inspection System and Application to Overlay Weld Flaw Detection (초음파 자동 검사시스템의 개발과 오버레이 용접부의 결함검사)

  • Nam, Young-Hyun;Seong, Un-Hak
    • Journal of the Korean Society for Nondestructive Testing
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    • v.20 no.6
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    • pp.562-567
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    • 2000
  • Many pressure vessels for power and industrial plant are fabricated from low alloy carbon steels. The inner sides of pressure vessels are commonly weld-cladded with austenitic stainless steels to minimize problems of corrosive attack. Disbonding cracks are often detected at the transition region of welding interlayer, which is serious problem to reliability of pressure vessels. We have developed C-scan system to high speed inspection of overlay weld using DSP(digital signal processor). This system consists of signal processing parts (oscilloscope, pulser/receiver, digitizer, DSP), scanner, program and position controller. The developed system has been applied to a practical ultrasonic testing in overlay weld, and demonstrated high speed with precision

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Influence of Steel Bar on Ultrasonic Velocity in Concrete (콘크리트 속의 철근이 초음파 속도에 미치는 영향)

  • Kim, Do-Hyun;Rhim, Hong-Chul
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2014.05a
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    • pp.122-123
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    • 2014
  • Measurement of the strength of concrete is an important indicator of the safety of the fresh as well as old concrete structures. It is possible to evaluate the strength of the concrete by means of an ultrasonic velocity method which is a kind of non-destructive inspection method for safety diagnostic evaluation of the building structures with aging. Steel embedded in the concrete and age of the concrete may affect ultrasonic pulse velocity. In order to accurately assess the strength of the concrete, it is necessary to understand rebar embedded in the concrete, steel shapes in various forms which effect ultrasonic pulse velocity. In this study, by measuring the velocity of ultrasonic waves generated when the waves pass through the ultrasonic pulse in a direction perpendicular to the reinforcing bars embedded in concrete, the effect of reinforcing bars on ultrasonic velocity accurately was verified and used to estimate the strength of the concrete.

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Nondestructive Evaluation Technique of Painted Sandwich Control Surfaces of CN-235 using Full-field Pulse-echo Ultrasonic Propagation Imaging System (전영역 펄스-에코 초음파전파영상화 시스템의 CN-235의 도색된 샌드위치 조종면 In-situ 비파괴평가 기술)

  • Hong, Seung-Chan;Lee, Jung-Ryul;Park, Jongwoon
    • Composites Research
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    • v.29 no.5
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    • pp.288-292
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    • 2016
  • In this paper, a novel ultrasonic propagation imaging system, called a full-field pulse-echo ultrasonic propagation imaging (FF PE UPI) system is introduced. The system nondestructively inspected targets with two-axis translation stage. The coincident laser beams for ultrasonic sensing and generation are scanned and pulse-echo mode laser ultrasounds are captured. This procedure makes it possible to generate full-field ultrasound in through-the-thickness direction as large as the scan area. Structural inspection results in the form of full-field ultrasonic wave propagation videos are introduced, which are painted sandwich control surfaces. In addition, the inspection results of FF PE UPI system are compared with conventional ultrasonic testing methods such as waterjet and portable C-scan.

Development of Crack Detecting Method at Steam Turbine Blade Root Finger using Ultrasonic Test (초음파탐상 검사를 이용한 증기터빈 블레이드 루트 휭거 균열 탐지기법 개발)

  • Yun, Wan-No;Kim, Jun-Sung;Kang, Myung-Soo;Kim, Duk-Nam
    • Journal of the Korean Society for Precision Engineering
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    • v.28 no.6
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    • pp.738-744
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    • 2011
  • The reliability of blade root fixing section is required to endure the centrifugal force and vibration stress for the last stage blade of steam turbine in thermal power plant. Most of the domestic steam turbine last stage blades have finger type roots. The finger type blade is very complex, so the inspection had been performed only on the exposed fixing pin cross-section area due to the difficulty of inspection. But the centrifugal force and vibration stress are also applied at the blade root finger and the crack generates, so the inspection method for finger section is necessary. For the inspection of root finger, inspection points were decided by simulating ultra-sonic path with 3D modeling, curve-shape probe and fixing jig were invented, and the characteristics analysis method of ultrasonic reflection signal and defect signal disposition method were invented. This invented method was actually executed at site and prevented the blade liberation failure by detecting the cracks at the fingers. Also, the same type blades of the other turbines were inspected periodically and the reliability of the turbine increased.

Two-module robotic pipe inspection system with EMATs

  • Lee, Jin-Hyuk;Han, Sangchul;Ahn, Jaekyu;Kim, Dae-Hyun;Moon, Hyungpil
    • Smart Structures and Systems
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    • v.13 no.6
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    • pp.1041-1063
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    • 2014
  • This work introduces a two-module robotic pipe inspection system with ultrasonic NDE device to evaluate the integrity of pipe structures. The proposed robotic platform has high mobility. The two module mobile robot platform overcomes pipe obstacle structures such as elbow, or T-branch joints by cooperative maneuvers. Also, it can climb up the straight pipeline at a fast speed due to the wheel driven mechanism. For inspection of pipe structure, SH-waves generated by EMAT are applied with additional signal processing methods. A wavelet transform is implemented to extract a meaningful and specific signal from the superposed SH-wave signals. Intensity ratio which is normalized the defect signals intensity by the maximum intensity of directly transmitted signals in the wavelet transforms spectrum is applied to evaluate defects quantitatively. It is experimentally verified that the robotic ultrasonic inspection system with EMAT is capable of non-destructive inspection and evaluation of defects in pipe structure successfully by applying signal processing method based on wavelet transform.