根据多个离散质量系统的总转动惯量公式
=Σ +Σ ( 2 + 2 )
x xi i ci ci I I M y z =Σ +Σ ( 2 + 2 )
y yi i ci ci I I M x z
=Σ +Σ ( 2 + 2 )
z zi i ci ci I I M x y
及多个离散质量系统的总惯量积公式
=Σ +Σ ⋅ ⋅ xy xyi i ci ci I I M x y =Σ +Σ ⋅ ⋅ xz xzi i ci ci I I M x z
=Σ +Σ ⋅ ⋅ yz yzi i ci ci