[足式机器人]Part3 机构运动学与动力学分析与建模 Ch00-2(2) 质量刚体的在坐标系下运动

本文仅供学习使用,总结很多本现有讲述运动学或动力学书籍后的总结,从矢量的角度进行分析,方法比较传统,但更易理解,并且现有的看似抽象方法,两者本质上并无不同。

2024年底本人学位论文发表后方可摘抄
若有帮助请引用
本文参考:
黎 旭,陈 强 洪,甄 文 强 等.惯 性 张 量 平 移 和 旋 转 复 合 变 换 的 一 般 形 式 及 其 应 用[J].工 程 数 学 学 报,2022,39(06):1005-1011.

食用方法
质量点的动量与角动量
刚体的动量与角动量——力与力矩的关系
惯性矩阵的表达与推导——在刚体运动过程中的作用
惯性矩阵在不同坐标系下的表达
务必自己推导全部公式,并理解每个符号的含义

机构运动学与动力学分析与建模 Ch00-2质量刚体的在坐标系下运动Part2

      • 2.2.3 欧拉方程 Euler equation


2.2.3 欧拉方程 Euler equation

对式 H ⃗ Σ M / O F \vec{H}_{\Sigma _{\mathrm{M}}/\mathrm{O}}^{F} H ΣM/OF进一步分析,有:
H ⃗ Σ M / O F = ∫ R ⃗ O P i F × ( d m i ⋅ d R ⃗ P i F d t ) = ∫ ( ( R ⃗ P i F − R ⃗ O F ) × V ⃗ P i F ) d m i = ∫ ( R ⃗ P i F × V ⃗ P i F ) d m i − ∫ ( R ⃗ O F × V ⃗ P i F ) d m i = H ⃗ Σ M F − R ⃗ O F × P ⃗ G F \begin{split} \vec{H}_{\Sigma _{\mathrm{M}}/\mathrm{O}}^{F}&=\int{\vec{R}_{\mathrm{OP}_{\mathrm{i}}}^{F}\times \left( \mathrm{d}m_i\cdot \frac{\mathrm{d}\vec{R}_{\mathrm{P}_{\mathrm{i}}}^{F}}{\mathrm{d}t} \right)}=\int{\left( \left( \vec{R}_{\mathrm{P}_{\mathrm{i}}}^{F}-\vec{R}_{\mathrm{O}}^{F} \right) \times \vec{V}_{\mathrm{P}_{\mathrm{i}}}^{F} \right) \mathrm{d}m_i} \\ &=\int{\left( \vec{R}_{\mathrm{P}_{\mathrm{i}}}^{F}\times \vec{V}_{\mathrm{P}_{\mathrm{i}}}^{F} \right) \mathrm{d}m_i}-\int{\left( \vec{R}_{\mathrm{O}}^{F}\times \vec{V}_{\mathrm{P}_{\mathrm{i}}}^{F} \right) \mathrm{d}m_i} \\ &=\vec{H}_{\Sigma _{\mathrm{M}}}^{F}-\vec{R}_{\mathrm{O}}^{F}\times \vec{P}_{\mathrm{G}}^{F} \end{split} H ΣM/OF=R OPiF×(dmidtdR PiF)=((R PiFR OF)×V PiF)dmi=(R PiF×V PiF)dmi(R OF×V PiF)dmi=H ΣMFR OF×P GF
对上式进一步求导,则有:
d H ⃗ Σ M / O F d t = d H ⃗ Σ M F d t − d ( R ⃗ O F × P ⃗ G F ) d t = d H ⃗ Σ M F d t − V ⃗ O F × P ⃗ G F − m t o t a l ⋅ R ⃗ O F × a ⃗ G F \frac{\mathrm{d}\vec{H}_{\Sigma _{\mathrm{M}}/\mathrm{O}}^{F}}{\mathrm{d}t}=\frac{\mathrm{d}\vec{H}_{\Sigma _{\mathrm{M}}}^{F}}{\mathrm{d}t}-\frac{\mathrm{d}\left( \vec{R}_{\mathrm{O}}^{F}\times \vec{P}_{\mathrm{G}}^{F} \right)}{\mathrm{d}t}=\frac{\mathrm{d}\vec{H}_{\Sigma _{\mathrm{M}}}^{F}}{\mathrm{d}t}-\vec{V}_{\mathrm{O}}^{F}\times \vec{P}_{\mathrm{G}}^{F}-m_{\mathrm{total}}\cdot \vec{R}_{\mathrm{O}}^{F}\times \vec{a}_{\mathrm{G}}^{F} dtdH ΣM/OF=dtdH ΣMFdtd(R OF×P GF)=dtdH ΣMFV OF×P GFmtotalR OF×a GF
其中:
H ⃗ Σ M F = ∫ R ⃗ P i F × p ⃗ P i F = ∫ ( R ⃗ G F + R ⃗ G P i F ) × ( d m i ⋅ ( V ⃗ G F + V ⃗ G P i F ) ) = ∫ R ⃗ G F × V ⃗ G F d m i ⏟ m t o t a l ⋅ R ⃗ G F × V ⃗ G F + ∫ R ⃗ G F × V ⃗ G P i F d m i ⏟ 0 + ∫ R ⃗ G P i F × V ⃗ G F d m i ⏟ 0 + ∫ R ⃗ G P i F × V ⃗ G P i F d m i ⏟ ∫ R ⃗ G P i F × ( ω ⃗ M F × R ⃗ G P i F ) d m i = m t o t a l ⋅ R ⃗ G F × V ⃗ G F + ∫ R ⃗ G P i F × ( ω ⃗ M F × R ⃗ G P i F ) d m i = m t o t a l ⋅ R ⃗ G F × V ⃗ G F + ∫ ( R ⃗ G P i F ⋅ R ⃗ G P i F ) ω ⃗ M F d m i − ∫ ( R ⃗ G P i F ⋅ ω ⃗ M F ) R ⃗ G P i F d m i \begin{split} \vec{H}_{\Sigma _{\mathrm{M}}}^{F}&=\int{\vec{R}_{\mathrm{P}_{\mathrm{i}}}^{F}\times \vec{p}_{\mathrm{P}_{\mathrm{i}}}^{F}}=\int{\left( \vec{R}_{\mathrm{G}}^{F}+\vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F} \right) \times \left( \mathrm{d}m_i\cdot \left( \vec{V}_{\mathrm{G}}^{F}+\vec{V}_{\mathrm{GP}_{\mathrm{i}}}^{F} \right) \right)} \\ &=\begin{array}{c} \underbrace{\int{\vec{R}_{\mathrm{G}}^{F}\times \vec{V}_{\mathrm{G}}^{F}}\mathrm{d}m_i}\\ m_{\mathrm{total}}\cdot \vec{R}_{\mathrm{G}}^{F}\times \vec{V}_{\mathrm{G}}^{F}\\ \end{array}+\begin{array}{c} \underbrace{\int{\vec{R}_{\mathrm{G}}^{F}\times \vec{V}_{\mathrm{GP}_{\mathrm{i}}}^{F}}\mathrm{d}m_i}\\ 0\\ \end{array}+\begin{array}{c} \underbrace{\int{\vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}\times \vec{V}_{\mathrm{G}}^{F}}\mathrm{d}m_i}\\ 0\\ \end{array}+\begin{array}{c} \underbrace{\int{\vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}\times \vec{V}_{\mathrm{GP}_{\mathrm{i}}}^{F}}\mathrm{d}m_i}\\ \int{\vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}\times \left( \vec{\omega}_{\mathrm{M}}^{F}\times \vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F} \right)}\mathrm{d}m_i\\ \end{array} \\ &=m_{\mathrm{total}}\cdot \vec{R}_{\mathrm{G}}^{F}\times \vec{V}_{\mathrm{G}}^{F}+\int{\vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}\times \left( \vec{\omega}_{\mathrm{M}}^{F}\times \vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F} \right)}\mathrm{d}m_i \\ &=m_{\mathrm{total}}\cdot \vec{R}_{\mathrm{G}}^{F}\times \vec{V}_{\mathrm{G}}^{F}+\int{\left( \vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}\cdot \vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F} \right) \vec{\omega}_{\mathrm{M}}^{F}}\mathrm{d}m_i-\int{\left( \vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}\cdot \vec{\omega}_{\mathrm{M}}^{F} \right) \vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}}\mathrm{d}m_i \end{split} H ΣMF=R PiF×p PiF=(R GF+R GPiF)×(dmi(V GF+V GPiF))= R GF×V GFdmimtotalR GF×V GF+ R GF×V GPiFdmi0+ R GPiF×V GFdmi0+ R GPiF×V GPiFdmiR GPiF×(ω MF×R GPiF)dmi=mtotalR GF×V GF+R GPiF×(ω MF×R GPiF)dmi=mtotalR GF×V GF+(R GPiFR GPiF)ω MFdmi(R GPiFω MF)R GPiFdmi
H ⃗ Σ M F \vec{H}_{\Sigma _{\mathrm{M}}}^{F} H ΣMF进一步求导,则有:
d H ⃗ Σ M F d t = { R ⃗ G F × m t o t a l ⋅ a ⃗ G F + 2 ∫ ( V ⃗ P i F ⋅ R ⃗ G P i F ) ω ⃗ M F d m i + ∫ ( R ⃗ G P i F ⋅ R ⃗ G P i F ) α ⃗ M F d m i − ∫ ( V ⃗ G P i F ⋅ ω ⃗ M F ) R ⃗ G P i F d m i − ∫ ( R ⃗ G P i F ⋅ α ⃗ M F ) R ⃗ G P i F d m i − ∫ ( R ⃗ G P i F ⋅ ω ⃗ M F ) V ⃗ G P i F d m i = { R ⃗ G F × m t o t a l ⋅ a ⃗ G F + ( ∫ ( R ⃗ G P i F ⋅ R ⃗ G P i F ) α ⃗ M F d m i − ∫ ( R ⃗ G P i F ⋅ α ⃗ M F ) R ⃗ G P i F d m i ) − ∫ ( R ⃗ G P i F ⋅ ω ⃗ M F ) ( ω ⃗ M F × R ⃗ G P i F ) d m i = { R ⃗ G F × m t o t a l ⋅ a ⃗ G F + ( ∫ ( R ⃗ G P i F T R ⃗ G P i F ) ⋅ E 3 × 3 α ⃗ M F d m i − ∫ ( R ⃗ G P i F T α ⃗ M F ) R ⃗ G P i F d m i ) − ∫ ( R ⃗ G P i F T ω ⃗ M F ) ( ω ⃗ M F × R ⃗ G P i F ) d m i = { R ⃗ G F × m t o t a l ⋅ a ⃗ G F + α ⃗ M F ∫ ( R ⃗ G P i F T R ⃗ G P i F ⋅ E 3 × 3 − R ⃗ G P i F R ⃗ G P i F T ) d m i − ω ⃗ M F × ( ∫ ( R ⃗ G P i F R ⃗ G P i F T ) d m i ⋅ ω ⃗ M F ) \begin{split} \frac{\mathrm{d}\vec{H}_{\Sigma _{\mathrm{M}}}^{F}}{\mathrm{d}t}&=\begin{cases} \vec{R}_{\mathrm{G}}^{F}\times m_{\mathrm{total}}\cdot \vec{a}_{\mathrm{G}}^{F}+2\int{\left( \vec{V}_{\mathrm{P}_{\mathrm{i}}}^{F}\cdot \vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F} \right) \vec{\omega}_{\mathrm{M}}^{F}}\mathrm{d}m_{\mathrm{i}}+\int{\left( \vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}\cdot \vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F} \right) \vec{\alpha}_{\mathrm{M}}^{F}}\mathrm{d}m_{\mathrm{i}}\\ -\int{\left( \vec{V}_{\mathrm{GP}_{\mathrm{i}}}^{F}\cdot \vec{\omega}_{\mathrm{M}}^{F} \right) \vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}}\mathrm{d}m_{\mathrm{i}}-\int{\left( \vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}\cdot \vec{\alpha}_{\mathrm{M}}^{F} \right) \vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}}\mathrm{d}m_{\mathrm{i}}-\int{\left( \vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}\cdot \vec{\omega}_{\mathrm{M}}^{F} \right) \vec{V}_{\mathrm{GP}_{\mathrm{i}}}^{F}}\mathrm{d}m_{\mathrm{i}}\\ \end{cases} \\ &=\begin{cases} \vec{R}_{\mathrm{G}}^{F}\times m_{\mathrm{total}}\cdot \vec{a}_{\mathrm{G}}^{F}+\left( \int{\left( \vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}\cdot \vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F} \right) \vec{\alpha}_{\mathrm{M}}^{F}}\mathrm{d}m_{\mathrm{i}}-\int{\left( \vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}\cdot \vec{\alpha}_{\mathrm{M}}^{F} \right) \vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}}\mathrm{d}m_{\mathrm{i}} \right)\\ -\int{\left( \vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}\cdot \vec{\omega}_{\mathrm{M}}^{F} \right) \left( \vec{\omega}_{\mathrm{M}}^{F}\times \vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F} \right) \mathrm{d}m_{\mathrm{i}}}\\ \end{cases} \\ &=\begin{cases} \vec{R}_{\mathrm{G}}^{F}\times m_{\mathrm{total}}\cdot \vec{a}_{\mathrm{G}}^{F}+\left( \int{\left( {\vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}}^{\mathrm{T}}\vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F} \right) \cdot E^{3\times 3}\vec{\alpha}_{\mathrm{M}}^{F}}\mathrm{d}m_{\mathrm{i}}-\int{\left( {\vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}}^{\mathrm{T}}\vec{\alpha}_{\mathrm{M}}^{F} \right) \vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}}\mathrm{d}m_{\mathrm{i}} \right)\\ -\int{\left( {\vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}}^{\mathrm{T}}\vec{\omega}_{\mathrm{M}}^{F} \right) \left( \vec{\omega}_{\mathrm{M}}^{F}\times \vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F} \right) \mathrm{d}m_{\mathrm{i}}}\\ \end{cases} \\ &=\begin{cases} \vec{R}_{\mathrm{G}}^{F}\times m_{\mathrm{total}}\cdot \vec{a}_{\mathrm{G}}^{F}+\vec{\alpha}_{\mathrm{M}}^{F}\int{\left( {\vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}}^{\mathrm{T}}\vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}\cdot E^{3\times 3}-\vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}{\vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}}^{\mathrm{T}} \right)}\mathrm{d}m_{\mathrm{i}}\\ -\vec{\omega}_{\mathrm{M}}^{F}\times \left( \int{\left( \vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}{\vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}}^{\mathrm{T}} \right)}\mathrm{d}m_{\mathrm{i}}\cdot \vec{\omega}_{\mathrm{M}}^{F} \right)\\ \end{cases} \end{split} dtdH ΣMF= R GF×mtotala GF+2(V PiFR GPiF)ω MFdmi+(R GPiFR GPiF)α MFdmi(V GPiFω MF)R GPiFdmi(R GPiFα MF)R GPiFdmi(R GPiFω MF)V GPiFdmi= R GF×mtotala GF+((R GPiFR GPiF)α MFdmi(R GPiFα MF)R GPiFdmi)(R GPiFω MF)(ω MF×R GPiF)dmi= R GF×mtotala GF+((R GPiFTR GPiF)E3×3α MFdmi(R GPiFTα MF)R GPiFdmi)(R GPiFTω MF)(ω MF×R GPiF)dmi= R GF×mtotala GF+α MF(R GPiFTR GPiFE3×3R GPiFR GPiFT)dmiω MF×((R GPiFR GPiFT)dmiω MF)
其中:
⇒ − ω ⃗ M F × ∫ ( R ⃗ G P i F R ⃗ G P i F T ) d m i ⋅ ω ⃗ M F = ω ⃗ M F × ( ∫ ( R ⃗ G P i F T R ⃗ G P i F ⋅ E 3 × 3 − R ⃗ G P i F R ⃗ G P i F T − R ⃗ G P i F T R ⃗ G P i F ⋅ E 3 × 3 ) d m i ⋅ ω ⃗ M F ) = ω ⃗ M F × ( ∫ ( R ⃗ G P i F T R ⃗ G P i F ⋅ E 3 × 3 − R ⃗ G P i F R ⃗ G P i F T ) d m i ⋅ ω ⃗ M F ) − ω ⃗ M F × ( ∫ ( R ⃗ G P i F T R ⃗ G P i F ⋅ E 3 × 3 ) d m i ⋅ ω ⃗ M F ) ⏟ 0 \begin{split} \Rightarrow &-\vec{\omega}_{\mathrm{M}}^{F}\times \int{\left( \vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}{\vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}}^{\mathrm{T}} \right)}\mathrm{d}m_{\mathrm{i}}\cdot \vec{\omega}_{\mathrm{M}}^{F} \\ &=\vec{\omega}_{\mathrm{M}}^{F}\times \left( \int{\left( {\vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}}^{\mathrm{T}}\vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}\cdot E^{3\times 3}-\vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}{\vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}}^{\mathrm{T}}-{\vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}}^{\mathrm{T}}\vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}\cdot E^{3\times 3} \right)}\mathrm{d}m_{\mathrm{i}}\cdot \vec{\omega}_{\mathrm{M}}^{F} \right) \\ &=\vec{\omega}_{\mathrm{M}}^{F}\times \left( \int{\left( {\vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}}^{\mathrm{T}}\vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}\cdot E^{3\times 3}-\vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}{\vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}}^{\mathrm{T}} \right)}\mathrm{d}m_{\mathrm{i}}\cdot \vec{\omega}_{\mathrm{M}}^{F} \right) -\begin{array}{c} \underbrace{\vec{\omega}_{\mathrm{M}}^{F}\times \left( \int{\left( {\vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}}^{\mathrm{T}}\vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}\cdot E^{3\times 3} \right)}\mathrm{d}m_{\mathrm{i}}\cdot \vec{\omega}_{\mathrm{M}}^{F} \right) }\\ 0\\ \end{array} \end{split} ω MF×(R GPiFR GPiFT)dmiω MF=ω MF×((R GPiFTR GPiFE3×3R GPiFR GPiFTR GPiFTR GPiFE3×3)dmiω MF)=ω MF×((R GPiFTR GPiFE3×3R GPiFR GPiFT)dmiω MF) ω MF×((R GPiFTR GPiFE3×3)dmiω MF)0

将上两式进行汇总,可得:
⇒ d H ⃗ Σ M F d t = { R ⃗ G F × m t o t a l ⋅ a ⃗ G F + ∫ ( R ⃗ G P i F T R ⃗ G P i F ⋅ E 3 × 3 − R ⃗ G P i F R ⃗ G P i F T ) d m i α ⃗ M F + ω ⃗ M F × ( ∫ ( R ⃗ G P i F T R ⃗ G P i F ⋅ E 3 × 3 − R ⃗ G P i F R ⃗ G P i F T ) d m i ⋅ ω ⃗ M F ) = R ⃗ G F × m t o t a l ⋅ a ⃗ G F + [ I ] Σ M / G F α ⃗ M F + ω ⃗ M F × ( [ I ] Σ M / G F ⋅ ω ⃗ M F ) \begin{split} \Rightarrow \frac{\mathrm{d}\vec{H}_{\Sigma _{\mathrm{M}}}^{F}}{\mathrm{d}t}&=\begin{cases} \vec{R}_{\mathrm{G}}^{F}\times m_{\mathrm{total}}\cdot \vec{a}_{\mathrm{G}}^{F}+\int{\left( {\vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}}^{\mathrm{T}}\vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}\cdot E^{3\times 3}-\vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}{\vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}}^{\mathrm{T}} \right)}\mathrm{d}m_{\mathrm{i}}\vec{\alpha}_{\mathrm{M}}^{F}\\ +\vec{\omega}_{\mathrm{M}}^{F}\times \left( \int{\left( {\vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}}^{\mathrm{T}}\vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}\cdot E^{3\times 3}-\vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}{\vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}}^{\mathrm{T}} \right)}\mathrm{d}m_{\mathrm{i}}\cdot \vec{\omega}_{\mathrm{M}}^{F} \right)\\ \end{cases} \\ &=\vec{R}_{\mathrm{G}}^{F}\times m_{\mathrm{total}}\cdot \vec{a}_{\mathrm{G}}^{F}+\left[ I \right] _{\Sigma _{\mathrm{M}}/\mathrm{G}}^{F}\vec{\alpha}_{\mathrm{M}}^{F}+\vec{\omega}_{\mathrm{M}}^{F}\times \left( \left[ I \right] _{\Sigma _{\mathrm{M}}/\mathrm{G}}^{F}\cdot \vec{\omega}_{\mathrm{M}}^{F} \right) \end{split} dtdH ΣMF= R GF×mtotala GF+(R GPiFTR GPiFE3×3R GPiFR GPiFT)dmiα MF+ω MF×((R GPiFTR GPiFE3×3R GPiFR GPiFT)dmiω MF)=R GF×mtotala GF+[I]ΣM/GFα MF+ω MF×([I]ΣM/GFω MF)

其中:
[ I ] Σ M / G F = ∫ ( R ⃗ G P i F T R ⃗ G P i F ⋅ E 3 × 3 − R ⃗ G P i F R ⃗ G P i F T ) d m i \left[ I \right] _{\Sigma _{\mathrm{M}}/\mathrm{G}}^{F}=\int{\left( {\vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}}^{\mathrm{T}}\vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}\cdot E^{3\times 3}-\vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}{\vec{R}_{\mathrm{GP}_{\mathrm{i}}}^{F}}^{\mathrm{T}} \right)}\mathrm{d}m_i [I]ΣM/GF=(R GPiFTR GPiFE3×3R GPiFR GPiFT)dmi

[ I ] Σ M / G F \left[ I \right] _{\Sigma _{\mathrm{M}}/\mathrm{G}}^{F} [I]ΣM/GF被称为惯性矩阵inertia matrix(或称为惯量矩阵),为该物体在固定坐标系下相对于质心点 G G G惯性张量

进而可知:
d H ⃗ Σ M F d t = M ⃗ Σ M F = ∫ R ⃗ P i F × d F ⃗ P i F = R ⃗ G F × m t o t a l ⋅ a ⃗ G F + [ I ] Σ M / G F α ⃗ M F + ω ⃗ M F × ( [ I ] Σ M / G F ⋅ ω ⃗ M F ) \frac{\mathrm{d}\vec{H}_{\Sigma _{\mathrm{M}}}^{F}}{\mathrm{d}t}=\vec{M}_{\Sigma _{\mathrm{M}}}^{F}=\int{\vec{R}_{\mathrm{P}_{\mathrm{i}}}^{F}\times \mathrm{d}\vec{F}_{\mathrm{P}_{\mathrm{i}}}^{F}}=\vec{R}_{\mathrm{G}}^{F}\times m_{\mathrm{total}}\cdot \vec{a}_{\mathrm{G}}^{F}+\left[ I \right] _{\Sigma _{\mathrm{M}}/\mathrm{G}}^{F}\vec{\alpha}_{\mathrm{M}}^{F}+\vec{\omega}_{\mathrm{M}}^{F}\times \left( \left[ I \right] _{\Sigma _{\mathrm{M}}/\mathrm{G}}^{F}\cdot \vec{\omega}_{\mathrm{M}}^{F} \right) dtdH ΣMF=M ΣMF=R PiF×dF PiF=R GF×mtotala GF+[I]ΣM/GFα MF+ω MF×([I]ΣM/GFω MF)
上式被称为:欧拉方程在惯性坐标系下相对固定点的表达式;当固定点与质心点重合时(此时G点为固定点),则有:
M ⃗ Σ M / G F = M ⃗ Σ M F − R ⃗ G F × ( m t o t a l ⋅ a ⃗ G F ) = R ⃗ G F × ( m t o t a l ⋅ a ⃗ G F ) + [ I ] Σ M / G F α ⃗ M F + ω ⃗ M F × ( [ I ] Σ M / G F ⋅ ω ⃗ M F ) − R ⃗ G F × ( m t o t a l ⋅ a ⃗ G F ) = [ I ] Σ M / G F α ⃗ M F + ω ⃗ M F × ( [ I ] Σ M / G F ⋅ ω ⃗ M F ) \begin{split} \vec{M}_{\Sigma _{\mathrm{M}}/\mathrm{G}}^{F}&=\vec{M}_{\Sigma _{\mathrm{M}}}^{F}-\vec{R}_{\mathrm{G}}^{F}\times \left( m_{\mathrm{total}}\cdot \vec{a}_{\mathrm{G}}^{F} \right) \\ &=\vec{R}_{\mathrm{G}}^{F}\times \left( m_{\mathrm{total}}\cdot \vec{a}_{\mathrm{G}}^{F} \right) +\left[ I \right] _{\Sigma _{\mathrm{M}}/\mathrm{G}}^{F}\vec{\alpha}_{\mathrm{M}}^{F}+\vec{\omega}_{\mathrm{M}}^{F}\times \left( \left[ I \right] _{\Sigma _{\mathrm{M}}/\mathrm{G}}^{F}\cdot \vec{\omega}_{\mathrm{M}}^{F} \right) -\vec{R}_{\mathrm{G}}^{F}\times \left( m_{\mathrm{total}}\cdot \vec{a}_{\mathrm{G}}^{F} \right) \\ &=\left[ I \right] _{\Sigma _{\mathrm{M}}/\mathrm{G}}^{F}\vec{\alpha}_{\mathrm{M}}^{F}+\vec{\omega}_{\mathrm{M}}^{F}\times \left( \left[ I \right] _{\Sigma _{\mathrm{M}}/\mathrm{G}}^{F}\cdot \vec{\omega}_{\mathrm{M}}^{F} \right) \end{split} M ΣM/GF=M ΣMFR GF×(mtotala GF)=R GF×(mtotala GF)+[I]ΣM/GFα MF+ω MF×([I]ΣM/GFω MF)R GF×(mtotala GF)=[I]ΣM/GFα MF+ω MF×([I]ΣM/GFω MF)
此时为固定坐标系下相对固定点质心 G G G求解的欧拉方程。

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