面積慣性矩轉換公式
發表於 : 2017 1月 25 (週三) 12:28 pm
計算I_(y^,)
(Ix+Iy)⁄2-(Ix-Iy)⁄2 cos2θ+I_xy sin2θ
計算Ix^,y^,
(Ix-Iy)⁄2 sin2θ+ I xy cos2θ
承上兩式,請問如何將其各置換成:(Ix+Iy)⁄2-(Ix-Iy)⁄2 cos2θ+I_xy sin2θ ; (Ix-Iy)⁄2 sin2θ+ I xy cos2θ
如附件以紅線打圈處,謝謝!
(Ix+Iy)⁄2-(Ix-Iy)⁄2 cos2θ+I_xy sin2θ
計算Ix^,y^,
(Ix-Iy)⁄2 sin2θ+ I xy cos2θ
承上兩式,請問如何將其各置換成:(Ix+Iy)⁄2-(Ix-Iy)⁄2 cos2θ+I_xy sin2θ ; (Ix-Iy)⁄2 sin2θ+ I xy cos2θ
如附件以紅線打圈處,謝謝!