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一、计算法:设已知长轴=a,短轴=b运用椭圆公式 x~2/a~2+y~2/b~2=1则 y=±b/a(a~2-x~2)~(1/2)则 y=±(a~2-x~2)~(1/(b/a))_以 a 为横座标,b 为纵座标,设 x≤a/2一系列的值,求出各值相应的 y 值。在现场根据直角座标方法求出曲线上各点,联此各点,即为椭圆曲线的轨迹。二、作图法:一般椭圆锥体护坡,不论设置在何种情况下,都应已知长轴=a,短轴=b。已知长短轴,即可采用同心圆法、平行四边形法、近似四圆心法或钉线划法等方法,在方格图纸上取用适当的比例,作出椭圆曲线轨迹,在现场中读出图纸上所示轨迹上各点相应的 x、y 值,即可根据直角座标方法在现场设置
First, the calculation method: Set the known long axis = a, short axis = b using the elliptic formula x ~ 2 / a ~ 2 + y ~ 2 / b ~ 2 = 1 y = ± b / a (A ~ 2-x ~ 2) ~ (1 / (b / a)) _ a is the abscissa, b is the ordinate, and x≤a / 2 a series of values, find the value of the corresponding y value. At the scene according to the Cartesian coordinate method to find the points on the curve, together with the points, that is, the trajectory of the elliptic curve. Second, mapping method: general elliptical cone slope protection, no matter what the circumstances set, should be known long axis = a, short axis = b. Known long and short axis, you can use the concentric circle method, parallelogram method, approximate four circle center method or nail line drawing and other methods, take the appropriate ratio on the grid drawing, make elliptic curve trajectory, read the drawings in the field On the trajectory shown on the corresponding point x, y value, according to Cartesian coordinates in the field set