转动惯量 A=Ai+Ai Ais A+4i+Ai A=A()+4,(·)+A,(·)=414+a24,+a:4 A=A(-)+A,(·3)+A,()=a214+a224+a234 A=A()+A(·)+A,(3)=a314+a324+434 4-244 j=1 为当坐标旋转时所满足的关系。大学 物理 转动惯量 1 1 2 2 3 3 1 1 2 2 3 3 A Ai A i A i Ai A i A i        = + + =   +   +   1 1 1 1 2 2 1 3 3 1 1 1 1 1 2 2 1 3 3 A = A (i i) + A (i i) + A (i i) = a A + a A + a A       j j Ai ai jA A A i i A i i A i i a A a A a A A A i i A i i A i i a A a A a A =  =  =   +   +   = + +  =   +   +   = + + 3 1 3 1 1 3 2 2 3 3 3 3 3 1 1 3 2 2 3 3 3 2 1 1 2 2 2 2 3 3 2 2 1 1 2 2 2 2 3 3 ( ) ( ) ( ) ( ) ( ) ( )             为当坐标旋转时所满足的关系