The Experts below are selected from a list of 38223 Experts worldwide ranked by ideXlab platform

Joon-young Park - One of the best experts on this subject based on the ideXlab platform.

  • Magnet–Solenoid type active vibrometer for Non-Destructive Testing of electric power transmission line insulators
    Ndt & E International, 2010
    Co-Authors: Byung-hak Cho, Jae-kyung Lee, Joon-young Park
    Abstract:

    An active vibrometer used for the Non-Destructive Test of electric power transmission line insulators has been developed. With a permanent magnet and a couple of coils, the vibrometer exerts impact force to a Test object and in turn picks up the vibration of the object. The resonance frequencies with the amplitudes obtained from the vibrometer are used as a basis for detecting defects in the object. The vibrometer is controlled by an electronic device designed to facilitate the fully automated Testing process with consistent repeatability and reliability which are essential to the Non-Destructive Test. The vibrometer is expected to be applied to the wide area of defect detection including the classification of mechanical parts in production and inspection processes.

  • Magnet-Solenoid type active vibrometer for Non-Destructive Testing of electric power transmission line insulators
    NDT and E International, 2010
    Co-Authors: Byung-hak Cho, Jae-kyung Lee, Joon-young Park
    Abstract:

    An active vibrometer used for the Non-Destructive Test of electric power transmission line insulators has been developed. With a permanent magnet and a couple of coils, the vibrometer exerts impact force to a Test object and in turn picks up the vibration of the object. The resonance frequencies with the amplitudes obtained from the vibrometer are used as a basis for detecting defects in the object. The vibrometer is controlled by an electronic device designed to facilitate the fully automated Testing process with consistent repeatability and reliability which are essential to the Non-Destructive Test. The vibrometer is expected to be applied to the wide area of defect detection including the classification of mechanical parts in production and inspection processes. ?? 2009 Elsevier Ltd. All rights reserved.

Byung-hak Cho - One of the best experts on this subject based on the ideXlab platform.

  • Magnet–Solenoid type active vibrometer for Non-Destructive Testing of electric power transmission line insulators
    Ndt & E International, 2010
    Co-Authors: Byung-hak Cho, Jae-kyung Lee, Joon-young Park
    Abstract:

    An active vibrometer used for the Non-Destructive Test of electric power transmission line insulators has been developed. With a permanent magnet and a couple of coils, the vibrometer exerts impact force to a Test object and in turn picks up the vibration of the object. The resonance frequencies with the amplitudes obtained from the vibrometer are used as a basis for detecting defects in the object. The vibrometer is controlled by an electronic device designed to facilitate the fully automated Testing process with consistent repeatability and reliability which are essential to the Non-Destructive Test. The vibrometer is expected to be applied to the wide area of defect detection including the classification of mechanical parts in production and inspection processes.

  • Magnet-Solenoid type active vibrometer for Non-Destructive Testing of electric power transmission line insulators
    NDT and E International, 2010
    Co-Authors: Byung-hak Cho, Jae-kyung Lee, Joon-young Park
    Abstract:

    An active vibrometer used for the Non-Destructive Test of electric power transmission line insulators has been developed. With a permanent magnet and a couple of coils, the vibrometer exerts impact force to a Test object and in turn picks up the vibration of the object. The resonance frequencies with the amplitudes obtained from the vibrometer are used as a basis for detecting defects in the object. The vibrometer is controlled by an electronic device designed to facilitate the fully automated Testing process with consistent repeatability and reliability which are essential to the Non-Destructive Test. The vibrometer is expected to be applied to the wide area of defect detection including the classification of mechanical parts in production and inspection processes. ?? 2009 Elsevier Ltd. All rights reserved.

Jae-kyung Lee - One of the best experts on this subject based on the ideXlab platform.

  • Magnet–Solenoid type active vibrometer for Non-Destructive Testing of electric power transmission line insulators
    Ndt & E International, 2010
    Co-Authors: Byung-hak Cho, Jae-kyung Lee, Joon-young Park
    Abstract:

    An active vibrometer used for the Non-Destructive Test of electric power transmission line insulators has been developed. With a permanent magnet and a couple of coils, the vibrometer exerts impact force to a Test object and in turn picks up the vibration of the object. The resonance frequencies with the amplitudes obtained from the vibrometer are used as a basis for detecting defects in the object. The vibrometer is controlled by an electronic device designed to facilitate the fully automated Testing process with consistent repeatability and reliability which are essential to the Non-Destructive Test. The vibrometer is expected to be applied to the wide area of defect detection including the classification of mechanical parts in production and inspection processes.

  • Magnet-Solenoid type active vibrometer for Non-Destructive Testing of electric power transmission line insulators
    NDT and E International, 2010
    Co-Authors: Byung-hak Cho, Jae-kyung Lee, Joon-young Park
    Abstract:

    An active vibrometer used for the Non-Destructive Test of electric power transmission line insulators has been developed. With a permanent magnet and a couple of coils, the vibrometer exerts impact force to a Test object and in turn picks up the vibration of the object. The resonance frequencies with the amplitudes obtained from the vibrometer are used as a basis for detecting defects in the object. The vibrometer is controlled by an electronic device designed to facilitate the fully automated Testing process with consistent repeatability and reliability which are essential to the Non-Destructive Test. The vibrometer is expected to be applied to the wide area of defect detection including the classification of mechanical parts in production and inspection processes. ?? 2009 Elsevier Ltd. All rights reserved.

Yan Hong Huang - One of the best experts on this subject based on the ideXlab platform.

  • Non-Destructive Test for pile beneath bridge in the time, frequency, and time-frequency domains using transient loading
    Nonlinear Dynamics, 2010
    Co-Authors: Kuo Feng Lo, Sheng Huoo Ni, Yan Hong Huang
    Abstract:

    The main objective of this paper is to evaluate the capabilities of Non-Destructive Test (NDT) methods by using transient loading, i.e. the sonic echo (SE) method in the time domain and the impulse response (IR) method in the frequency domain, in detecting the pile length in the foundations of bridges. Methods such as these, which are based on transient elastic waves, have been used for many years. However, several drawbacks have been described in the literature, including difficulties with the installation of the Testing devices. In this paper, several experimental studies were carried out on existing scoured bridge pile foundations. In order to overcome environmental limitations, the Ultrasonic Pulse Velocity method was adopted, and the installation procedure for the Testing devices was modified. Moreover, a recently developed numerical signal processing tool, the Wavelet Transform (WT), was adopted to interpret the Testing signal in the time-frequency domain. The results indicate that the modified Testing procedure is feasible for in-service pile integrity Tests. The processed signal clearly and visually illustrates the temporal changes, and the pile tip can be highlighted in the time-frequency domain. The depth of the scour pile tips can be detected precisely with the proposed modified device installation and the improved numerical signal processing. The results in the time-frequency domain are also consistent with traditional SE/IR Testing methods.

R. Gaillard - One of the best experts on this subject based on the ideXlab platform.

  • Effectiveness Analysis of a Non-Destructive Single Event Burnout Test Methodology
    IEEE Transactions on Nuclear Science, 2014
    Co-Authors: P. Oser, J. Mekki, G. Spiezia, E. Fadakis, G. Foucard, P. Peronnard, A. Masi, R. Gaillard
    Abstract:

    It is essential to characterize power MosFETs regarding their tolerance to destructive Single Event Burnouts (SEB). Therefore, several Non-Destructive Test methods have been developed to evaluate the SEB cross-section of power devices. A power MosFET has been evaluated using a Test circuit, designed according to standard Non-Destructive Test methods discussed in the literature. Guidelines suggest a prior adaptation of auxiliary components to the device sensitivity before the radiation Test. With the first value chosen for the de-coupling capacitor, the external component initiated destructive events and affected the evaluation of the cross-section. As a result, the influence of auxiliary components on the device cross-section was studied. This paper presents the obtained experimental results, supported by SPICE simulations, to evaluate and discuss how the circuit effectiveness depends on the external components.

  • Effectiveness analysis of a Non-Destructive Single Event Burnout Test methodology
    2013 14th European Conference on Radiation and Its Effects on Components and Systems (RADECS), 2013
    Co-Authors: P. Oser, J. Mekki, G. Spiezia, E. Fadakis, G. Foucard, P. Peronnard, A. Masi, R. Gaillard
    Abstract:

    It is essential to characterize power MosFETs regarding their tolerance to destructive Single Event Burnouts (SEB). Therefore, several Non-Destructive Test methods have been developed to evaluate the SEB cross-section of power devices. Power MosFETs have been evaluated using a Test circuit, designed according to standard Non-Destructive Test methods discussed in the literature. However, destructive events were observed and affected the evaluation of the cross-section. This paper analyzes results obtained using different Test circuit configurations based on standard Non-Destructive Test methodologies and evaluates their respective effectiveness. In addition, protection methods are discussed and simulations are performed to better understand the underlying effects.

  • Laser Validation of a Non-Destructive Test Methodology for the Radiation Sensitivity Assessment of Power Devices
    IEEE Transactions on Nuclear Science, 2011
    Co-Authors: F. Miller, R. Gaillard, S. Morand, A. Douin, T. Carriere, N. Buard
    Abstract:

    This paper presents a new Test methodology based on the characterization of transient events to perform Non-Destructive radiation sensitivity assessments of destructive single event effects in power devices. Laser Tests and simulations are used to demonstrate its efficiency.