• Title/Summary/Keyword: bellows cover

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Development of Composite Examination Equipment for Improvement of Fire Detectors Checking Technology (감지기의 점검 기술향상을 위한 복합시험기의 개발)

  • Kong, Ha-Sung;Lee, Jong-Hwa
    • Journal of the Korea Safety Management & Science
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    • v.10 no.4
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    • pp.135-143
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    • 2008
  • Recently as the testing of fire detector used the testing device for fire detector, there are something the matter in the perception function loss of fire detector, structure and form of the testing device for fire detector. The problem at oxidation of emitting smoke ashes hazardous article part and so on that checking person absorbs be. In this paper the problem or the conventional the examination equipment of fire detectors is analysed and researched. To solve these problems after the theoretical study and design and paint drawing of equipment the prototype of composite examination equipment of fire detectors was made. After compared with the conventional, part that improve of composite examination equipment of fire detectors are verified through the examination. In the future it will be useful the operation state and correct operation time of the fire detectors are measured after the research about the quality of the material and transparency of bellows cover is done.

A Study on Characteristic Analysis of C-Plate Cover and Examination of Weak Parts (C-Plate 커버의 구조해석 및 취약부 규명)

  • 김옥구;송준엽;강재훈;박화영
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.373-377
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    • 2003
  • Recently, advanced manufacturing systems with high speed and intelligence have been developed for the betterment of machining ability. In this case, reliability prediction work with motion characteristic evaluation of sliding cover(C-plate, Bellows, etc) has also important role from design procedure to manufacturing and assembly process. Accordingly in this study, H/W test-bed system for reliability evaluation of sliding cover has been developed to obtain proper reference data for design of new model, prevention trouble (failure mode), and improvement of quality and lift cycle extremely for advanced mother machinery.

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Use of Support Vector Machines for Defect Detection of Metal Bellows Welding (금속 벨로우즈 용접의 결점 탐지를 위한 서포터 벡터 머신의 이용)

  • Park, Min-Chul;Byun, Young-Tae;Kim, Dong-Won
    • Journal of the Korea Society of Computer and Information
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    • v.20 no.1
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    • pp.11-20
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    • 2015
  • Typically welded bellows are checked with human eye and microscope, and then go through leakage test of gas. The proposed system alternates these heuristic techniques using support vector machines. Image procedures in the proposed method can cover the irregularity problem induced from human being. To get easy observation through microscope, 3D display system is also exploited. Experimental results from this automatic measurement show the welding detection is done within one tenth of permitted error range.

Pressure Regulation System for Optimal Operation of the Pneumatic VAD with Bellows-Type Closed Pneumatic Circuit (벨로우즈 방식의 폐회로를 가진 공압식 심실 보조장치의 최적 작동을 위한 압력 조절 시스템)

  • Kim, Bum-Soo;Lee, Jung-Joo;Nam, Kyung-Won;Jeong, Gi-Seok;Ahn, Chi-Bum;Sun, Kyung
    • Journal of Biomedical Engineering Research
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    • v.28 no.4
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    • pp.569-576
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    • 2007
  • Ventricular Assist Device(VAD) has switched its goal from a short-tenn use for bridge-to-transplantation to a long-tenn use for destination therapy, With this goal, the importance of long-tenn reliability gets more interests and importances, H-VAD is an portable extracorporeal biventricular assist device, and adopts an electro-pneumatic driving mechanism. The pneumatic pressure to pump out blood is generated with compression of bellows, and is transmitted in a closed pneumatic circuit through a pneumatic line. The existing pneumatic VAD adopts a air compressor which can generate stable pressures but has defects such as a noise and a size problem. Thus, it is not suitable for being used as a portable device, These problems are covered with adopting a closed pneumatic circuit mechanism with a bellows which has a small size and small noise generation, but it has defects that improper pneumatic setting causes a failure of adequate flow generation. In this study, the pneumatic pressure regulation system is developed to cover these defects of a bellows-type pneumatic VAD. The optimal pneumatic pressure conditions according to various afterload conditions for an optimal flow rate were investigated and the afterload estimation algorithm was developed, The final pneumatic regulation system estimates a current afterload and regulate the pneumatic pressure to the optimal point at a given afterload condition. The afterload estimation algorithm showed a sufficient performance that the standard deviation of error is 8.8 mmHg, The pneumatic pressure regulation system showed a sufficient performance that the flow rate was stably governed to various afterload conditions. In a further study, if a additional sensor such as ultrasonic sensor is developed to monitor the direct movement of diaphragm in a blood pump part, the reliability would be greatly increased. Moreover, if the afterload estimation algorithm gets more accuracy, it would be also helpful to monitor the hemodynamic condition of patients.