• 제목/요약/키워드: Arm structure

검색결과 365건 처리시간 0.033초

MEMS를 이용한 추진기관 점화안전장치 (Ignition Safe-Arm-Unit Using Micro-Electromechanical Systems)

  • 장승교;이상헌;장현기
    • 한국추진공학회:학술대회논문집
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    • 한국추진공학회 2009년도 제33회 추계학술대회논문집
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    • pp.282-285
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    • 2009
  • MEMS를 적용한 추진기관용 점화안전장치를 설계하고 제작하였다. MEMS는 일반적인 기계요소 설계 방식을 따라 설계하였다. 제작된 시료에 대한 검사 결과와 설계 데이터를 비교해 본 결과 스프링의 비선형 요소에 의한 영향과 가공오차 등으로 인하여 설계된 성능 값과 근사한 차이를 나타냈다. MEMS가 결합된 점화안전장치의 성능 시험을 실시함으로써 MEMS 적용 가능성을 입증하였다.

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적응 입력다듬기를 이용한 유연한 조작기의 진동제어 (The Vibration Control of Flexible Manipulators using Adaptive Input Shaper)

  • 신효필;정영무;강이석
    • 제어로봇시스템학회논문지
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    • 제5권2호
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    • pp.220-227
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    • 1999
  • The position control accuracy of a robot arm is significantly deteriorated when a long slender arm robot is operated at a high speed. In this case, the robot arm needs to be modeled as a flexible structure, not a rigid one, and its control system needs to be designed with its elastic modes taken into account. In this paper, the vibration control scheme of a one-link flexible manipulator using adaptive input shaper in conjunction with PID controller is presented. The robot consists of a flexible arm manufactured with a thin aluminium plate, an AC servo motor with a harmonic drive for speed reduction, an optical encoder and an accelerometer. On-line identification of the vibration mode is done using the pruned decimation-in-time FFT algorithm to estimate the parameter of the input shaper. Experimental results of the flexible manipulator with a PID controller and input shaper are provided to show the effectiveness of the advocated controllers.

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공압식 러버 액츄에이터를 사용한 경량 로봇 팔의 제작에 관한 연구 (A study on the development of the light weight robot arm using pneumatic rubber actuator)

  • 김연호;정명진
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 1991년도 한국자동제어학술회의논문집(국내학술편); KOEX, Seoul; 22-24 Oct. 1991
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    • pp.523-527
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    • 1991
  • A rubber pneumatic controlled actuator is a new actuator. It is very light With a high power-to-weight ratio. In this thesis, a control method for a two link robot arm using the rubber actuator is developed. The structure of the servo control is made up of two sections. The position control is performed by PID feedback control. The air pressure is controlled by Servo Valve Unit driven by PWM and the control input is compensated by software operation. The numerical simulation of this control method to two link robot arm is presented to verify the performance of the closed loop system. The actual control of the real two link robot arm with rubber actuator is taken and its results are discussed.

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외측상박 유리피판의 유용성에 관한 재조명; 전박부 유리피판을 대체할 수 있는가? (Revision of Lateral Arm Free Flap; Can It be a Substituete for Radial Forearm Free Flap?)

  • 안희창
    • Archives of Reconstructive Microsurgery
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    • 제6권1호
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    • pp.80-86
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    • 1997
  • The lateral arm flap was reported first by Song et al. in 1982, and Katsaros and colleagues described an anatomic study and clinical cases in 1984. This flap is thin, has relatively constant vascular anatomy, and provides relatively acceptable scar at the donor site. Despite its many advantages its wide application has been limited by its short vascular pedicle with small diameter of lumen, and its small skin paddle. We studied its anatomical structure to get longer length of vascular pedicle, wide diameter and thinner part of flap beyond the lateral condyle through 6 fresh cadaver dissection and dye injection study. We experienced 21 cases of lateral arm free flaps and 26 cases of forearm free flaps from May, 1992 to January, 1996. We compared its usefulness with forearm free flaps in the aspects of donor morbidity, operative factors, quality of flap, and versatility. In conclusion, lateral arm flap can replace the role of forearm flap in most cases so that patient's donor morbidity can be reduced especially in the women.

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경량화에 대한 안전성을 고려한 로우컨트롤암의 다목적 최적설계 (Multi-objective Optimization of Lower Control Arm Considering the Stability for Weight Reduction)

  • 이동화;박영철;허선철
    • 한국자동차공학회논문집
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    • 제11권4호
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    • pp.94-101
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    • 2003
  • Recently, miniaturization and weight reduction is getting more attention due to various benefits in automotive components design. It is a trend that the design of experiment(DOE) and statical design method are frequently used for optimization. In this research, the safety of lower control arm is evaluated according to its material change form S45C to A16061 for the reduction of arm's weight. The variance analysis on the basis of structure analysis and DOE is applied to the lower control m. We have proposed a statistical design model to evaluate the effect of structural modification by performing the practical multi-objective optimization considering mass, stress and deflection.

스마트팩토리 실현을 위한 뉴럴네트워크 기반 이중 아암을 갖는 제조용 로봇의 지능제어에 관한 연구 (A Study on an Intelligent Control of Manufacturing with Dual Arm Robot Based on Neural Network for Smart Factory Implementation)

  • 정금준;김동호;김희진;장기원;한성현
    • 한국산업융합학회 논문집
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    • 제24권3호
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    • pp.351-361
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    • 2021
  • This study proposes an intelligent control of manufacturing robot with dual arm based on neural network for smart factory implementation. In the control method of robot system, the perspectron structure of single layer based on neural network is useful for simple computation. However, the limitations of computation are emerging in areas that require complex computations. To overcome limitation of complex parameters computation a new intelligent control technology is proposed in this study. The performance is illustrated by simulation and experiments for manufacturing robot dual arm robot with eight axes.

2단 2-암 시누어스 안테나의 소형화에 관한 연구 (Study of Miniaturization of 2 Stages 2-Arm Sinuous Antenna)

  • 윤성현
    • 한국통신학회논문지
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    • 제42권2호
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    • pp.374-382
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    • 2017
  • 본 논문에서는 주파수 대역 0.8-6GHz를 포함하는 2단 2-암 시누어스 안테나를 제안하였다. 제안한 안테나는 전체 반경 60mm중 1단 반경 50mm까지는 8개의 셀을 자기 상보구조(셀의 각 폭을 $90^{\circ}$)로 설계하고 2단은 폭 10mm사이에 비 자기상보 구조로 0.5개의 셀 각 폭을 $720^{\circ}$로 구성하였다. 측정 결과, 동일한 제원과 반경을 사용한 기존의 1단 2-암 시누어스 안테나는 반사손실 -10dB가 약 0.878GHz에서부터 발생하였지만, 제안한 안테나는 반사손실 -10dB이 0.807GHz 부터 발생하여, 시누어스 안테나의 소형화의 가능성을 제시하였다.

집전전류에 의한 열원을 고려한 경량 판토그래프 상부암 혼성구조체의 열 특성 분석 연구 (Thermal Characteristics Analysis of Upper Arm Hybrid Structure of Lightweight Pantograph Considering Heat Source by Collecting Current)

  • 박찬배;정거철
    • 한국철도학회논문집
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    • 제20권4호
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    • pp.466-473
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    • 2017
  • 최근 국내 철도 관련 기관에서 고속집전용 판토그래프를 개발하고 있으며, 이는 상부암의 경량화를 위하여 기존의 강재(Steel) 대신에 CFRP(Carbon Fiber Reinforced Plastics)와 알루미늄의 혼성구조체를 적용한 구조를 갖는다. KTX-산천 열차의 경우, 한 대의 판토그래프를 통해서 열차에 필요한 모든 전력을 공급해야 하는 동력집중식이므로 판토그래프는 큰 통전 용량을 가져야 한다. 하지만, 알루미늄 파이프의 열적 특성 분석 없이 통전 용량을 증대시키기 위하여 파이프의 두께를 임의로 증가시키게 되면 상부암의 무게 증가로 집전성능의 저화를 초래할 수 있다. 따라서, 본 논문에서는 KTX-산천 열차의 정지 상태에서 수전 시 판토그래프 상부암 혼성구조체를 이루는 알루미늄 파이프의 시간 경과에 따른 온도 특성 변화를 열해석을 통하여 분석하고, 제시된 판토그래프 통전 용량에 부합되는 알루미늄 파이프의 최소 두께의 적정성을 검토하고자 한다.

수태음폐경 노선에 대한 고찰: 천부·협백을 중심으로 (Discussion on the Route of Lung Meridian: Focus on LU3 and LU4)

  • 송석모
    • Korean Journal of Acupuncture
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    • 제39권4호
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    • pp.172-183
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    • 2022
  • Objectives : An error was found in the recent standard by the World Health Organization (WHO) on the locations of the Upper arm Route of Lung Meridian (URLM) and its acupoints LU3 and LU4. This possible incorrect information is being taught throughout Korean medicine colleges nationwide, which follow WHO standards. Therefore, an investigation is required to sort out this discrepancy based on the evidence in historical documents. Methods : The location of WHO's URLM and LU3 and LU4 were compared with corresponding information in the classical literature. The anatomical structure mentioned in these classical documents was examined. Finally, an assessment was conducted on whether this structure is reflected in the WHO standards. Results : Classical literature prior to the early 20th century records the locations of the Lung Meridian and LU3 and LU4 of the upper arm to be in the artery on the medial aspect. This artery corresponds to the brachial artery. The location established by the WHO is on the anterolateral side of the upper arm, where no large arteries exist that can be found by haptic search or angiographically. The anterolateral side of the upper arm belongs to the Yang aspect, which does not coincide with the Yin aspect of Lung Meridian. Conclusions : The WHO's URLM and LU3-4 standards do not agree with the classical literature. The correct route must coincide with the brachial artery passing through the medial side of the humerus. The actual location of LU3-4 is on the medial aspect of the arm, just medial to the border of the biceps brachii muscle, on the brachial artery, 3-4 B-cun inferior to the anterior axillary fold.

마이크로스트립 미앤더 선로의 신호 왜곡 현상 연구 (The Study on Signal Distortion of Meander-shaped Microstrip Line)

  • 두진경;홍영표;김정민;육종관
    • 한국전자파학회:학술대회논문집
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    • 한국전자파학회 2005년도 종합학술발표회 논문집 Vol.15 No.1
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    • pp.197-202
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    • 2005
  • In this paper, we analyzed the signal distortion incorporating meander-shaped transmission line on PCB in broadband frequency range, up to 50GHz. This broadband characteristic provides reasonable analysis of digital pulse having very short rising time. Simulation results reveal suppression characteristic at multiband which is dependent on only the width of meander arm. This width of arm also can be adjusted using different permittivity because it provides different effective wave-length. It is found that the suppression characteristic shows sharpness with as a function of the number of arms. However, these characteristics shown limitation for microstrip line structure rather than for stripline structure, so we can avoid these unwanted phenomena using stripline structure.

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