Journal of Applied Sciences ›› 1997, Vol. 15 ›› Issue (1): 41-47.

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STUDY ON SPHERICITY MEASUREMENT AND EVALUATION OF A SPHERE BY FITTING A QUTARATIC EQUATION SPHERE

ZHU XNUNSHENG, REN XINSHENG, LIU GUOLIANG, XUE BINGYUAN   

  1. Shanghai Jiao-tong University, Shanghai 200030) A
  • Received:1995-06-14 Revised:1995-10-27 Online:1997-03-31 Published:1997-03-31

Abstract: This paper indicates that LSS (least square sphere) sphericity error doesn't keep invariant with respect to coordinates translation but QES (quadratic equation sphere) sphericity error can. Method which can efficiently eliminate the twice positional error as a result of turning over the sphere for its full shape test has been firstly. proposed, and the formula of QES sphericity error has been esta-blished by means of QES fitting.

Key words: quadratic equation sphere, full sphere sphericity, sphericity evaluation