• Title/Summary/Keyword: Carn Curve

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Synthesis of Optimum CAM Curve by Cubic Spline (Cubic Spline을 사용한 최적 캠곡선의 합성)

  • 손태영;양민양
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.19 no.5
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    • pp.1168-1175
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    • 1995
  • The application of cubic spline is presented for basic curve (DRD motion) of cam motion. The purpose of this paper is to achieve better dynamic characteristics than general cam curves. A cubic spline is a piecewise function that is continuous in displacement, velocity and acceleration. The best cam curve is obtained by changing the weights of the object function. So the method can be used to any machine system case by case. For the proposed object function, the result has improved all characteristics such as velocity, acceleration and jerk compared with that of the modified sine curve.

ROCHE MODEL AND ABSOLUTE DIMENSIONS OF THE ECLIPSING BINARY Y CAM WITH A PULSATING COMPONENT (맥동 식쌍성 Y Cam의 ROCHE 모형과 절대 물리량)

  • Lee, J.W.;Kim, C.H.;Kim, S.L.;Youn, J.H.;Kwon, S.G.
    • Journal of Astronomy and Space Sciences
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    • v.19 no.3
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    • pp.187-196
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    • 2002
  • We performed CCD photometric observations of the eclipsing binary Y Cam with a pulsating component, for 16 nights from November 2000 to May 2001 using a V filter attached to the 61-cm reflector at Sobaeksan Optical Astronomy Observatory. Our V light curve and Broglia & Marin's (1974) BV ones were analyzed with Mode 2 for a detached Roche model as well as Model 5 for a semi-detached one in the Wilson-Devinney code. From the analysis, we found the following results: 1) It is hardly discernible from only light curve synthesis which model between the detached and semi-detached ones is a real Roche model of Y Cam. 2) There exist the third light of about 2% and 3% in B and V light curves of Y Cam, respectively. 3) The light curve solution is immune from the light variation due to the pulsation of the primary component of Y cam. However, the detached model rather than the semi-detached one has slightly better fitted to the observations which were get rid of the pulsation effect. 4) The absolute dimensions of Y Cam were calculated for two Roche models.