• Title/Summary/Keyword: Tool Failure

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Study of Electronic Hardware Integrated Failure Rate: Considering Physics of Failure Rate and Radiation Failures Rate (물리 고장률과 방사선 고장률을 반영한 전자 하드웨어 통합 고장률 분석 연구)

  • Dong-min Lee;Chang-hyeon Kim;Kyung-min Park;Jong-whoa Na
    • Journal of Advanced Navigation Technology
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    • v.28 no.2
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    • pp.216-224
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    • 2024
  • This paper presents a method for analyzing the reliability of hardware electronic equipment, taking into account failures caused by radiation. Traditional reliability analysis primarily focuses on the wear out failure rate and often neglects the impact of radiation failure rates. We calculate the wear out failure rate through physics of failure analysis, while the radiation failure rate is semi-empirically estimated using the Verilog Fault Injection tool. Our approach aims to ensure reliability early in the development process, potentially reducing development time and costs by identifying circuit vulnerabilities in advance. As an illustrative example, we conducted a reliability analysis on the ISCAS85 circuit. Our results demonstrate the effectiveness of our method compared to traditional reliability analysis tools. This thorough analysis is crucial for ensuring the reliability of FPGAs in environments with high radiation exposure, such as in aviation and space applications.

Hardware-in-the-loop Simulation of CNC-controlled Feed Drives (CNC 제어 이송계의 Hardware-in-the-loop 시뮬레이션)

  • Lee, Wonkyun;Lee, Chan-Young;Kim, Joo-Yeong;Song, Chang Kyu;Min, Byung-Kwon
    • Journal of the Korean Society for Precision Engineering
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    • v.32 no.5
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    • pp.447-454
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    • 2015
  • Design and application of hardware-in-the-loop simulation (HILS) for design of CNC-controlled machine tool feed drives is discussed. The CNC machine tool is a complex mechatronics system where the complexity results from the software-based controller composed of a variety of functionalities and advanced control algorithms. Therefore, using a real CNC controller in the control simulation has merits considering the efforts and accuracy of the simulation modeling. In this paper challenges in HILS for a CNC controlled feed drive, such as minimization of time delay and transmission error that are caused by discretization of the feed drive model, is elaborated. Using an experimental HILS setup of a machine tool feed drive applications in controller gain selection and CNC diagnostics are presented.

Weldability and properties of lap joints by pin FSW with 1050 Al sheet (1050 Al판재의 핀 마찰 교반용접에 의한 실험적 연구)

  • Jang, Seok-Ki;Park, Jong-Seek;Han, Min-Su
    • Journal of Advanced Marine Engineering and Technology
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    • v.31 no.4
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    • pp.394-400
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    • 2007
  • The properties and weldability of lap joints by PFSW with 1050 Al sheet was investigated according to tool shape. dimension and welding condition. Tensile shear test was carried out for lap jointed specimen, and the hardness in the joint regions was examined. Moreover interfacial joining length, metallograph and failure location of the lap-jointed cross section were discussed. Two tool types were a simple cylindrical type and a notched cylindrical type. Under joining conditions such as plunging depth of 2.2mm. rotating speed of 1600rpm and dwelling time of 3s, the tensile shear strength of lap-jointed specimen by the notched type tool was superior to that by simple cylindrical type tool. The maximum tensile shear load of lap jointed specimen was 5807N. Optimal dimensions of the notched type tool were as follows : diameters of the shoulder and pin were 18ϕmm and 10ϕmm, and pin length was 2.2mm.

Development of the Reliability Evaluation Model and the Analysis Tool for Embedded Softwares (임베디드 소프트웨어 신뢰성 평가 모델 분석 툴 개발)

  • Seo, Jang-Hoon;Kim, Sun-Ho
    • IE interfaces
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    • v.21 no.1
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    • pp.109-119
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    • 2008
  • Reliability of embedded softwares, as one of factors which affect system reliability, is the probability of failure-free software operation for a specified period of time in a specified environment. and Embedded software is different from general package software because hardware and operating system are tightly coupled to each other. Reliability evaluation models for embedded softwares currently used do not separate estimation and prediction models clearly, and even a standard model has not been proposed yet. In this respect, we choose a reliability estimation model suitable for embedded softwares among software evaluation models being used, and modified the model so as to accomodate recent software environments. In addtion, based on the model, the web-based reliability prediction tool RPX is developed. Finally, an embedded software is analyzed using the tool.

A Study on the Wear Detection of Drill State for Prediction Monitoring System (예측감시 시스템에 의한 드릴의 마멸검출에 관한 연구)

  • 신형곤;김태영
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.11 no.2
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    • pp.103-111
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    • 2002
  • Out of all metal-cutting process, the hole-making process is the most widely used. It is estimated to be more than 30% of the total metal-cutting process. It is therefore desirable to monitor and detect drill wear during the hole-drilling process. One important aspect in controlling the drilling process is monitoring drill wear status. There are two systems, Basic system and Online system, to detect the drill wear. Basic system comprised of spindle rotational speed, feed rates, thrust torque and flank wear measured by tool microscope. Outline system comprised of spindle rotational speed feed rates, AE signal, flank wear area measured by computer vision, On-line monitoring system does not need to stop the process to inspect drill wear. Backpropagation neural networks (BPNs) were used for on-line detection of drill wear. The output was the drill wear state which was either usable or failure. This paper deals with an on-line drill wear monitoring system to fit the detection of the abnormal tool state.

Development of a Remote Inspection Method and Device for Line Sleeves on Transmission Line (송전선로 직선슬리브 원격점검 방법 및 장치)

  • Lee, Jae-Kyung;Jung, Nam-Joon;Kim, Ho-Ki;Kim, Kyeong-Ho
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.60 no.4
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    • pp.206-213
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    • 2011
  • Line sleeves, which used to connect ACSR cables when transmission lines were constructing, sometimes cause power transmission failure due to deterioration and corrosion. Therefore, power transmission line should be inspected regularly to prevent national disaster. Current inspection tool detects insertion length of transmission line on line sleeves, the inspection tool includes enormous error by operator. Moreover, the system is not controlled remotely, negligent accident would be caused while inspecting. To deal with those problems, KEPCO reviewed several ways to inspect line sleeves and proposes new method to inspect line sleeve by measuring magnetic flex which penetrate junction of steel and aluminum sleeve. The developed inspection tool is reliable enough to detect eccentric sleeves. Also, the developed inspection device was applied on actual transmission line and verified its effectiveness.

The Spreadsheet-Based Tool Model for Efficient MMORPG Data Management (효율적인 MMORPG 데이터 관리를 위한 스프레드시트 기반 툴 모델)

  • Kang, Shin-Jin;Kim, Chang-Hun
    • Journal of Korea Multimedia Society
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    • v.12 no.10
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    • pp.1457-1465
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    • 2009
  • In MMORPG development process, spreadsheet based data management has advantages in the handling of functions and analysis of large data set. But it has limitations in inserting, deleting, searching and relational management of that. In this paper, we proposed the spreadsheet based tool model for large data set for MMORPG development. Our system can reduce the risk of data management failure in MMORPG development process and improve the efficiency of data handling in the large-scale team.

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A Method for Offline Inter-Turn Fault Diagnosis of Interior Permanent Magnet Synchronous Motor through the Co-Analysis (연동해석을 통한 영구자석 동기전동기의 오프라인 Inter-Turn 고장진단법)

  • Cho, Sooyoung;Oh, Ye Jun;Lee, GangSeok;Bae, Jae-Nam;Lee, Ju
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.67 no.3
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    • pp.365-373
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    • 2018
  • In this paper, inter-turn fault diagnosis of the interior permanent magnet synchronous motor (IPMSM) is performed in offline state by linking the finite element analysis (FEA) tool and control simulation tool. In order to diagnose the inter-turn fault, it is important to select the current value to determine the fault. First, the basic principles for inter-turn fault diagnosis of IPMSM are explained and co-analysis model for fault diagnosis is constructed. Further, in order to select the appropriate high frequency voltage, the change of the current value to be judged as failure was analyzed at various voltage and frequency conditions, and the change of the current value according to the number of the failed windings was analyzed. Finally, the current value to be judged as failure is selected.

Influence of failed blade-pitch-control system to FOWT by aero-elastic-control-floater-mooring coupled dynamic analysis

  • Bae, Yoon Hyeok;Kim, Moo-Hyun
    • Ocean Systems Engineering
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    • v.3 no.4
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    • pp.295-307
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    • 2013
  • More FOWTs (floating offshore wind turbines) will be installed as relevant regulations and technological hurdles are removed in the coming years. In the present study, a numerical prediction tool has been developed for the fully coupled dynamic analysis of FOWTs in time domain including aero-loading, tower elasticity, blade-rotor dynamics and control, mooring dynamics, and platform motions so that the influence of rotor-control dynamics on the hull-mooring performance and vice versa can be assessed. The developed coupled analysis program is applied to Hywind spar design with 5 MW turbine. In case of spar-type floaters, the control strategy significantly influences the hull and mooring dynamics. If one of the control systems fails, the entire dynamic responses of FOWT can be significantly different. Therefore, it is important to maintain various control systems in a good operational condition. In this regard, the effects of failed blade pitch control system on FOWT performance including structural and dynamic responses of blades, tower, and floater are systematically investigated. Through this study, it is seen that the failure of one of the blade pitch control system can induce significant dynamic loadings on the other blades and the entire FOWT system. The developed technology and numerical tool are readily applicable to any types of floating wind farms in any combinations of irregular waves, dynamic winds, and steady currents.

Analysis of a Repair Processes Using a Process Mining Tool (프로세스 마이닝 기법을 활용한 고장 수리 프로세스 분석)

  • Choi, Sang Hyun;Han, Kwan Hee;Lim, Gun Hoon
    • The Journal of the Korea Contents Association
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    • v.13 no.4
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    • pp.399-406
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    • 2013
  • Recently, studies about process mining for creating and analyzing business process models from log data have received much attention from BPM (Business Process Management) researchers. Process mining is a kind of method that extracts meaningful information and hidden rules from the event log of enterprise information systems such as ERP and BPM. In this paper, repair processes of electronic devices are analyzed using ProM which is a process mining tool. And based on the analysis of repair processes, the method for finding major failure patterns is proposed by multi-dimensional data analysis beyond simple statistics. By using the proposed method, the reliability of electronic device can be increased by providing the identified failure patterns to design team.