• Title/Summary/Keyword: 자기 스프링

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Measurement and Analysis of Pulse Wave using Clip Type Pulsimeter Equipped with a Permanent Magnet and a Hall Device (영구자석과 홀소자로 구비된 집게형 맥진기를 이용한 맥진파형 측정과 분석)

  • Son, Il-Ho;Lee, Sang-Suk
    • Journal of the Korean Magnetics Society
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    • v.21 no.3
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    • pp.104-107
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    • 2011
  • We measured signals at the "Guan" region of a radially arterial pulse using the prototype of a clamping pulsimeter equipped with a Hall effect device, which is passed signals through the voltage detecting hard ware system. The important four different measuring times of the period, systolic, reflective, and notch peaks for a temporally pulse signal are obtained and compared each other from the analysis for an arbitrary pulse wave of one position of small size permanent magnet. It is possible to measure the reproducible pulse rate and blood pressure by using the cuffless clip type pulsimeter without an unpleasant oppressive feeling due to the use of pressurization.

Analysis of Moving Body Characteristics by Coupling Finite Element Method and Motion Equation (유한요소법과 운동방정식의 결합에 의한 운동체의 특성 해석)

  • 김영선;이준호;이기식;이복용
    • Journal of the Korean Magnetics Society
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    • v.6 no.5
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    • pp.281-286
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    • 1996
  • For the accurate analysis of motional characteristics of electrical machines, it is needed to solve the motion equations together with the electromagnetic field equations. In this paper the sequential coupling of systems, the spring mass system and the electromagnetic system, is adopted. The induced current and the magnetic fields are calculated by finite element method(FEM) with given speed. And then, with the computed elec-tromagnetic force, the mechanical equations are solved by the Runge-Kutta method. The above two processes are repeated sequentially to obtain the time domain solutions. The resultant values are applied to the energy conservation law to prove the usefulness of the proposed sequential method.

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Design of a Geometric Adaptive Straightness Controller for Shaft Straightening Process (축교정을 위한 기하학적 진직도 적응제어기 설계)

  • Kim, Seung-Cheol;Jeong, Seong-Jong
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.24 no.10 s.181
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    • pp.2451-2460
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    • 2000
  • In order to minimize straightness error of deflected shaft, a geometric adaptive straightness controller system is studied. A multi-step straightening and a three-point bending process have been developed for the geometric adaptive straightness controller. Load-deflection relationship, on-line identification of variations of material properties, on-line springback prediction, and real-time hydraulic control methodology are studied for the three-point bending process. By deflection pattern analysis and fuzzy self-learning method in the multi-step straightening process, a straightening point and direction, desired permanent deflection and supporting condition are determined. An automatic straightening machine has been fabricated for rack bars by using the developed ideas. Validity of the proposed system is verified through experiments.

A Study on Actuator Design for SA Compensation (구면 수차 보상을 위한 엑츄에이터 설계에 대한 연구)

  • 이성훈;박관우;김진아;최인호;김진용
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2004.05a
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    • pp.346-350
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    • 2004
  • In Blu-ray(BD) optical system, as a short laser wavelength of laser diode and thin cover layer thickness of' disc, the proper adjustment of spherical aberration should be performed. Considering thin cover layer' thickness and tolerance variation of disc in BD optical system, spherical aberration in BD format is mort: serious than CDㆍDVD format Especially, in dual-layer disc, to compensate the aberration at each layer, optical component should be moved finely in the way of optical path. In this study, 1 -axis moving actuator was introduced as the method of compensating the spherical aberration, and the mechanism of the system was described. Finally, its effect on optical system will be mentioned.

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The design and performance estimation of air springs for the suspension of Maglev (자기부상열차 현수장치용 공기스프링의 설계와 성능 시험)

  • Lee Jae-Ik;Woo Yi-Wan;Kim Kuk-Jin;Kim Young-Gu
    • Proceedings of the KSR Conference
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    • 2004.10a
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    • pp.216-221
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    • 2004
  • The performance of secondary suspension is one of the most important characteristics of railway vehicles in the regard of vibration and riding comfort. For this reason, the suspension shall be designed to absorb vibration energy effectively and to avoid the resonance which would be occurred by the vibration of the bogies in driving. The main factor of characteristics of suspension is spring coefficient of air spring, and this paper shows how to achieve the desired coefficient and the results of the tests of new air springs.

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CD/DVD Compatible Optical Pickup Actuator Design (CD/DVD 겸용 광 픽업 액추에이터의 설계)

  • 이문구;권대갑;이관철;정회원
    • Journal of the Korean Society for Precision Engineering
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    • v.15 no.7
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    • pp.98-103
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    • 1998
  • Recently, DVD/CD compatible driver is needed for DVD and CD is widely used as a new optical data restoring device. The optical systems of DVD and CD driver are different because they have different optical feature. If only one objective lens is used, the change of an aperture or a dual focal length of the lens is required. This method, however, increases the number of parts and results in loss of the power of laser light. Hence, we propose a dual lens actuator design that can read DVD and CD respectively. Albeit magnetic spring is important mechanism in the dual lens actuator design, there has not been the systematic approach to design the mechanism in the preceding researches. In this article. the guideway to design magnetic spring is presented by using the qualitative theoretical approach and the finite element analysis.

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Research on adaptedness of Freeware FrameWork using UML and X-INTERNET (UML과 X-INTERNET을 활용한 프리웨어 프레임웍의 적합성에 관한 연구)

  • Kwark, Woo-Young;Lim, Yong-Muk;Kim, Woo-Sung
    • Proceedings of the Korea Information Processing Society Conference
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    • 2009.11a
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    • pp.163-164
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    • 2009
  • 오늘날 기업들은 비즈니스의 가치체인(Value Chain)의 변화로 회사의 해체와 재통합 기업의 글로벌화, 비즈니스의 아웃소싱, 산업영역의 붕괴가 빈번하게 이루어지고 있는 것이 현재기업의 현실이다. 따라서 기업은 비용을 절감하고 매출을 높이며 운영자본 및 고정자산의 지출을 최소화하기 위하여 전세계 자기업의 시스템을 통합관리하려 하고 있다. 이를 충족하기 위하여 델 사는 웹 시스템을 구축하여 정보기술측면의 유연성을 확보하게 되었다. 본 논문에서는 프리웨어 프레임워크인 알바티스, 스프링프레임웍, EJB를 UML툴로 프로그램을 설계하고, JSTL, X-INTERNET로 표현함으로써 네트워크사용량, 컴포넌트개발, 프로그램배포, 오프라인작업의 가능성, 대량데이터의 처리, 웹서비스 이용, 프로그램의 설치, 유저인터페이스, 유연성, 확장성, 보안성을 측정하여 프로젝트 특성상의 적합성을 검증하려 한다.

Mechanism Design and Control Technique of Duct Cleaning Robot with Self-position Recognition (자기위치 인식 가능한 덕트 청소로봇의 메카니즘 설계 및 제어기법)

  • Jang, Woojin;Seo, Myungin;Ha, Junhwan;Park, Kyongtae;Kim, Dong-Hwan
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.19 no.1
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    • pp.85-95
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    • 2019
  • This work shows how to design a robot structure and to control to overcome obstacles while traveling through ducts of various diameters and shapes by three-legged robot. Circuits are centered in the body to connect the three wheel bodies that are driven around the center body with the 4-section slider link structure. Also, the springs are used to contract and expand the robot legs so that it can be caparable of various environments. Geared motor, spring, and belt were selected based on the static and dynamic calculation to be suitable to horizontal and vertical travels. The center body is equipped with a camera and the distance sensors, and a control algorithms are implemented so that it can be successfully performed in L-type and T-type ducts. Using UWB modules and trilateration algorithm, the location of the duct-cleaning robot inside the duct could be identified successfully.

Failure Study for Knee Joint Through 3D FE Modeling Based on MR Images (자기공명영상 기반 3차원 유한요소모델링을 통한 무릎관절의 파손평가)

  • Bae, Ji-Yong;Park, Jin-Hong;Song, Seong-Geun;Park, Sang-Jin;Jeon, In-Su;Song, Eun-Kyoo
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.22 no.6
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    • pp.533-539
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    • 2009
  • In this study, the femur, the tibia, the articular cartilage and the menisci are three dimensionally reconstructed using MR images of healthy knee joint in full extension of 26-year-old male. Three dimensional finite element model of the knee joint is fabricated on the reconstructed model. Also, the FE models of ligaments and tendons are attached on the biologically suitable position of the FE model. Bones, articular cartilages and menisci are considered as homogeneous, isotropic and linear elastic materials, and ligaments and tendons are modeled as truss element and nonlinear elastic springs. The numerical results show the contact pressure and the von Mises stress distribution in the soft tissues such as articular cartilages and menisci which can be regarded as important parameters to estimate the failure of the tissues and the pain of the patients.

Frequency Shaped Optimal Control of Semi-active Suspension System Using an MR Damper (자기유변유체를 이용한 반능동형 현가장치의 Frequency shaped 최적 제어)

  • 김기덕;이재형;전도영
    • The Korean Journal of Rheology
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    • v.11 no.2
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    • pp.112-121
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    • 1999
  • An MR(Magneto-Rheological) fluids damper is designed and applied to vibration suppression of a 1/4 car model. The damping constant of MR damper changes according to input current which is controlled in a semi-active way. Several control algorithms are compared in simulations and experiments. The advantage of the proposed Frequency shaped LQ control is that passenger comfort is emphasized in the range of 4~8Hz and driving safety is emphasized around the resonance frequency of unsprung mass.

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