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旋转体体积——垫圈法 by Doug Kuhlmann

旋转体体积——垫圈法 by Doug Kuhlmann
几何画板及绘图内容加载中，请稍等……
2016-08-12 07:17
立体几何微积分积分
所属专题 Calculus - Applications of Integrals - Areas and Volumes
本范例演示了使用垫圈法计算旋转体体积的过程。涉及的核心数学概念包括积分、极限和函数图像。作图要点使用了GeoGebra的Sequence、Polygon、Rotate、Integral、Surface、RectangleSum等命令和对象来构建垫圈模型，并通过滑块动画展示体积变化。适合高中及以上学生学习和理解微积分中的体积计算方法。

GeoGebra 命令及参数

  1. Sequence(Polygon[((k * h), f(((k + p) * h))), (((k + 1) * h), f(((k + p) * h))), (((k + 1) * h), g(((k + p) * h))), ((k * h), g(((k + p) * h)))], k, 0, m - 1) → Rectangles
  2. Polygon(((DK * h), g(((DK + p) * h))), (((DK + 1) * h), g(((DK + p) * h))), (((DK + 1) * h), f(((DK + p) * h))), ((DK * h), f(((DK + p) * h)))) → Rectangle1, b, c, d, e
  3. Rotate(Rectangle1, α, a) → Rectangle1'
  4. Integral((π * ((4 - f(x))^(2) - (4 - g(x))^(2))), 0, 2) → VolInteg
  5. Rotate(f_1, α, a) → i
  6. Rotate(g_1, α, a) → j
  7. Surface(((DK + 1) * h), 4 - ((4 - u) * cos(β)), ((4 - u) * sin(β)), u, f(((DK + p) * h)), g(((DK + p) * h)), β, 0, α) → SideRight1
  8. Surface((DK * h), 4 - ((4 - u) * cos(β)), ((4 - u) * sin(β)), u, f(((DK + p) * h)), g(((DK + p) * h)), β, 0, α) → SideLeft1
  9. Surface(u, 4 - ((4 - f(((DK + p) * h))) * cos(β)), ((4 - f(((DK + p) * h))) * sin(β)), u, (DK * h), ((DK + 1) * h), β, 0, α) → Outer1
  10. Surface(u, 4 - ((4 - g(((DK + p) * h))) * cos(β)), ((4 - g(((DK + p) * h))) * sin(β)), u, (DK * h), ((DK + 1) * h), β, 0, α) → Inner1
  11. Rotate(Rectangles, α, a) → Rectangles'
  12. Surface(u, 4 - ((4 - g(u)) * cos(β)), ((4 - g(u)) * sin(β)), u, 0, 2, β, 0, (2 * π)) → Inner
  13. Surface(u, 4 - ((4 - f(u)) * cos(β)), ((4 - f(u)) * sin(β)), u, 0, 2, β, 0, (2 * π)) → Outer
  14. Sequence(Surface[u, 4 - ((4 - g(((k + p) * h))) * cos(β)), ((4 - g(((k + p) * h))) * sin(β)), u, (k * h), ((k + 1) * h), β, 0, α], k, 0, m - 1) → Inners
  15. Sequence(Surface[u, 4 - ((4 - f(((k + p) * h))) * cos(β)), ((4 - f(((k + p) * h))) * sin(β)), u, (k * h), ((k + 1) * h), β, 0, α], k, 0, m - 1) → Outers
  16. Sequence(Surface[(k * h), 4 - ((4 - u) * cos(β)), ((4 - u) * sin(β)), u, f(((k + p) * h)), g(((k + p) * h)), β, 0, α], k, 0, m - 1) → SidesLeft
  17. Sequence(Surface[((k + 1) * h), 4 - ((4 - u) * cos(β)), ((4 - u) * sin(β)), u, f(((k + p) * h)), g(((k + p) * h)), β, 0, α], k, 0, m - 1) → SidesRight
  18. RectangleSum(A, 0, (m * h), m, p) → WS