• Title/Summary/Keyword: 경사각

Search Result 690, Processing Time 0.237 seconds

Tilt Angle Estimation of Plane with a Pair of Accelerometers and a Gyroscope (가속도계와 자이로스코프를 이용한 평면의 경사각 추정)

  • Kang, Min Sig
    • Transactions of the Korean Society for Noise and Vibration Engineering
    • /
    • v.23 no.11
    • /
    • pp.966-972
    • /
    • 2013
  • Measurement or estimation of tilt angle is necessary for balancing robot such as Segway which is considered as a next generation transportation vehicle. However, it requires high-cost accurate sensors to hold balancing during stationary and moving situations. In this paper, a tilt angle estimation of a plane rotating in a vertical plane using low-cost sensors. Estimation using a set of 2-axis orthogonal accelerometers along with an inaccurate rate gyro has been considered. Feasibility and performance of the proposed technique has been verified through some experimental results.

A Study on Heat Transfer Phenomena during Solidification in a Circular Tube Containing Phase Change Material (Effect of Inclination) (원통형 용기내의 상변화물질에서의 응고 열전달에 관한 연구 (경사각 변화의 영향))

  • Song, H.J.;Kim, Y.J.;Ohu, S.C.;Yim, C.S.
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
    • /
    • v.6 no.3
    • /
    • pp.182-192
    • /
    • 1994
  • This paper focuses on the investigation of the heat transfer phenomena that occur inside the cylindrical tube. The inclination of the tube is adopted as a principal parameter varying from vertical to horizontal. The phase change material employed in this experiment is 99 percent pure n-docosane paraffin($C_{22}$ $H_{46}$). It is found that the amount of solidified mass during a prescribed solidifying period is not sensitive to the inclination of the tube but to the local layer thickness. It is studied that the latent energy is the largest contributor to the total extracted energy. The sensible energy($E_{s1}$, $E_{s2}$, $E_{s3}$) may not be negligible at the large wall-subcooling and initial-liquid-superheating, also at the first step of solidifying.

  • PDF

Experimental Investigation of Heat Transfer in the Channel with Two Inclined Perforated Baffles (구멍이 있는 2개의 경사진 배플이 있는 채널에서의 열전달에 대한 실험적 연구)

  • Putra, A. B. K.;Ahn, S.W.;Kang, H.K.
    • Journal of Power System Engineering
    • /
    • v.12 no.4
    • /
    • pp.39-45
    • /
    • 2008
  • 본 연구는 두 개의 경사진 다공 배플이 설치된 사각채널에서 국부 열전달향상 특성을 조사하였다. 채널은 19.8cm(W)$\times$4cm(H)의 단면적을 가지며 형상계수는 4.95이며 수력직경은 6.66cm이다. 4종류의 배플을 취급하였다. 가열 시험부에 동일한 크기, 경사각, 구멍형태의 경사 배플을 설치하였다. 경사 배플은 모두 19.8 cm의 폭, $2.55cm\times2.55cm$의 정 다이아몬드 형 구멍, 그리고 So의 경사각을 갖는다. 레이놀즈 수 범위는 23,000에서 57,000까지이다. 배플의 구멍의 수가 열전달 향상에 중요한 역할을 하였으며 구멍이 3개 인(baffle type II)가 가장 우수한 열전달 향상을 보였다.

  • PDF

Leaning Angle Optimization of the Turbine Blade using the Genetic Algorithm and CFD method (유전알고리즘과 CFD기법을 이용한 터빈블레이드 경사각 최적화)

  • Lee, Eun-Seok;Jeong, Yong-Hyun
    • 한국전산유체공학회:학술대회논문집
    • /
    • 2008.03b
    • /
    • pp.413-414
    • /
    • 2008
  • Abstract should be in English. The leaning angle optimization of turbine blade using the genetic algorithm was conducted in this paper. The calculation CFD technique was based upon the Diagonalized Alternating Directional Implicit scheme(DADI) with algebraic turbulencemodeling. The leaning angle of VKI turbine blade was represented using B-spline curve. The control points are the design variable. Genetic algorithm was taken into account as an optimization tool. The objective was to minimize the total pressure loss. The optimized final geometry shows the better aerodynamic performance compared with the initial turbine blade.

  • PDF

A Study of Characteristic According to Rake Angel of Endmill (엔드밀의 경사각에 따른 특성 연구)

  • 김경배;서천석;박찬섭;고성림
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
    • /
    • 2000.10a
    • /
    • pp.471-478
    • /
    • 2000
  • Endmill is one of the most important cutting tool, not only for machining of mold and die, but also for manufacturing of car industrial. Futhermore with spindle speeds on the increase and machined-surface quality aspiring to higher levels. The purpose of this study is an analysis of endmill's rake angle for appropriate tools design and making for the high speed machining. In this study, Experimental works are also executed to measure shape of endmills, cutting force, on different shape of endmills. Finally, To get concept of endmill design, Tool life was experimented on various design of tool from this study.

  • PDF

Effects of Tube Inclination Angle on Nucleate Pool Boiling Heat Transfer (튜브 경사각이 풀핵비등열전달에 미치는 영향)

  • Gang, Myeong-Gi
    • Transactions of the Korean Society of Mechanical Engineers B
    • /
    • v.26 no.1
    • /
    • pp.116-124
    • /
    • 2002
  • An experimental parametric study of a tubular heat exchanger has been carried out far the saturated water at atmospheric pressure to determine effects of tube inclination on pool boiling heat transfer. For the analysis, seven inclination angles(0°, 15°, 30°, 45°, 60°, 75°, and 90°) and two tube diameters(12.7 and 19.1 mm) were tested. According to the results, inclination angles result in very much change on pool boiling heat transfer. As the inclination angle is around horizontal or vertical, maximum or minimum heat transfer is expected, respectively. For the same wall superheat(about 5.5K) the ratio between two heat fluxes fur $\theta$ =15° and 75° has the value of more than five when the tube diameter is 12.7 mm and heat flux is increasing.

A Study on PIV Measurement of Multi-Channel Flow with Inclination angle (경사각을 갖는 다층채널 흐름의 PIV 계측에 관한 연구)

  • 조대환
    • Proceedings of the Korean Society of Marine Engineers Conference
    • /
    • 2000.05a
    • /
    • pp.153-158
    • /
    • 2000
  • Flow visualization and PIV measurements were conducted to investigate the flow characteristics of multi-channel with inclination angle. The water flow seeded with tiny vegetable powder as tracers revealed details of flow field. The PIV measurement to acquire multi-point velocity data simulatneously was carried out at three space of plates for 5, 10, and 15mm with variation of inlet flow rates of $0.25m^3/h$ and <$0.5m^3/h.$ Experiment results show that space of plates acts a significant role in separating process.

  • PDF

A Study on Position Fixing by Free Gyroscopes (프리 자이로스코프를 이용한 위치결정에 관한 연구)

  • 박석주;정태권
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
    • /
    • 2004.04a
    • /
    • pp.117-120
    • /
    • 2004
  • This paper is to investigate theoretically position fixing by using gyroscopic inertia of free gyroscope. with respect to a reference position or starting point, the changes of the inclination angle of the spin axes and the elapsed time are taken a measurement. By using the two basic factors like changes of angles a position is fixed.

  • PDF

플라스틱 부표의 해상 환경에 따른 특성 연구

  • Han, Ju-Seop;Yeo, Ji-Min;Yu, Yong-Su;Kim, Jong-Uk
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
    • /
    • 2017.11a
    • /
    • pp.222-223
    • /
    • 2017
  • 해외 선진국에서 부식에 강한 플라스틱 등부표를 설치 운영하고 있으며 국내 도입을 위하여 플라스틱 부표에 대한 장 단점을 분석하는 연구가 필요하다. 본 연구에서는 특수소재 부표류의 실제 해상 설치를 통하여 등부표의 안정성 분석, 표체 상부의 색도 변화 및 조패류 부착 상태를 비교 분석하였다. 안정성 분석을 위하여 2축 디지털 경사계를 표체 상부 철탑에 설치하였으며, 플라스틱(JET-7000, PB-26) 등부표와 철재 표준형(LL-26(M)) 등부표에 대하여 일일 최대 경사각을 확인하여 각 등부표의 최대 경사각을 분석하였다. 플라스틱 부표의 해상 환경에 따른 특성 분석을 위하여 자외선에 의한 색도 변화, 해양생물의 부착정도 등을 관찰하였다.

  • PDF

Development of Incline Test Application for Smart Phone (스마트폰용 경사시험 앱 개발)

  • Lee, Kyoung-Hoon;Jin, Jae-Hoon
    • Journal of Korea Ship Safrty Technology Authority
    • /
    • s.33
    • /
    • pp.32-52
    • /
    • 2012
  • 선박의 경사시험에 사용되는 수동식 계측기기는 측정 자체가 사람의 관능에 의존하기 때문에 현장계측자 개인의 경험에 따라 측정 데이타의 신뢰도에 편차가 발생할 개연성이 높다. 그러나 경험치에 의존하지 않고 경사시험의 신뢰성을 담보할 측정방법의 개선이나 개발은 현재까지 없었다. 경사시험 시 정밀한 계측센서를 이용하여 경사각을 계측한다면, 선박의 복원성판정에 정확성을 기할 수 있을 것이다. 따라서 본 연구에서는 전자식 자이로 센서가 내장된 스마트폰(태블릿 PC)을 이용하여 선박의 경사각을 계측하고, 아울러 그에 따른 선박의 경하 상태의 배수량 및 중량중심을 자동으로 계산할 수 있는 앱을 개발하여 선박 복원성판정의 유효성을 검증하였다.

  • PDF