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符号说明A_s—表面积(时);C_i—锥形常数;I_(rr)—横向惯性矩(磅·秒~2·时);I_(zz)—轴向惯性矩(磅·秒~2·时);M—质量(磅·秒~2/时);r_i—径向坐标(时);z_i—轴向坐标(时);Z_c—形心位置(时);ρ—密度(磅·秒~2/时~4)。计算简单截面的回转体几何特性和惯性特性的公式是现成的。但几何形状比较复杂的就不容易计算。然而,采用由线段组成的近似截面形状的数值法很容易地计算出。
REFERENCE SIGNS LIST A_s-surface area (in hours) C_i conical constant I rr lateral moment of inertia in pounds per second to 2 hours I zz axial inertia moment in pounds per second to 2 hours ); M-Mass (pounds per second to 2 per hour); r_i- radial coordinate (hour); z_i- axial coordinate (hour); Z_c- centroid position 2 / hour ~ 4). The formula for calculating the geometry and inertial properties of a simpler section of a rotor is readily available. But the geometry is more complex and not easy to calculate. However, the numerical method using the approximate cross-sectional shape of the line segment can be easily calculated.