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第三节 斜轴测投影

第三节 斜轴测投影 用平行斜角投影法得到的轴测投影称为斜轴测投影，特点： 1 ）轴测投影面 P 平行于 XOZ 坐标面。 2 ）投影方向不应平行于任何坐标面。 3 ）凡是平行于 XOZ 坐标面的平面形，其斜轴测投影均反映实形. 斜轴测投影分类： 1 ）斜等轴测投影：ｐ＝ｑ＝ｒ； 2 ）斜二等轴测投影：ｐ＝ｒ≠ｑ； 3 ）斜三轴测投影：ｐ≠ｑ≠ｒ。. 3.1 斜轴测投影的位置和轴向变形系数 斜二等轴测投影的变形系数为：ｐ＝ｒ＝１，ｑ＝０ . ５ 轴间角为： ∠ＸＯＺ＝９０ ° ∠ ＸＯＹ＝∠ＹＯＺ＝１３５ °

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第三节 斜轴测投影

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  1. 第三节 斜轴测投影 用平行斜角投影法得到的轴测投影称为斜轴测投影，特点：1）轴测投影面P平行于XOZ坐标面。2）投影方向不应平行于任何坐标面。3）凡是平行于XOZ坐标面的平面形，其斜轴测投影均反映实形 斜轴测投影分类： 1）斜等轴测投影：ｐ＝ｑ＝ｒ；2）斜二等轴测投影：ｐ＝ｒ≠ｑ；3）斜三轴测投影：ｐ≠ｑ≠ｒ。

  2. 3.1 斜轴测投影的位置和轴向变形系数 斜二等轴测投影的变形系数为：ｐ＝ｒ＝１，ｑ＝０.５ 轴间角为： ∠ＸＯＺ＝９０° ∠ＸＯＹ＝∠ＹＯＺ＝１３５° 3.2 斜二等轴测投影中平行于坐标面的圆的投影 标准斜二等轴测投影，采用轴向伸缩系数分别为：ｐ＝ｒ＝１，ｑ＝０.５。

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