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Thesis - Leigh Moody.pdf - Bad Request - Cranfield University

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Appendix D / Point Mass Dynamics<br />

_ _<br />

P&<br />

&<br />

ZR<br />

a,<br />

b<br />

ϕ<br />

ϕ<br />

ZYZ<br />

YYZ<br />

− 2 ⋅<br />

YR<br />

a,<br />

b<br />

R 2 ZR R R R R<br />

( Ψ&<br />

) + P ⋅ ( Ψ&<br />

& + 2⋅<br />

Ψ&<br />

⋅ Θ&<br />

⋅ cos )<br />

: = − P ⋅<br />

Θ<br />

I<br />

17-10<br />

a,<br />

b<br />

I<br />

I<br />

I<br />

I<br />

Equation 17.5-14<br />

YR R R XR R<br />

R<br />

R<br />

( P&<br />

⋅ Ψ&<br />

⋅ sΘ<br />

+ P&<br />

⋅ Θ&<br />

) + ϕ ( P ) + ϕ ( P )<br />

ϕ<br />

a,<br />

b<br />

ZX<br />

I<br />

XR<br />

a,<br />

b<br />

I<br />

A<br />

a,<br />

b<br />

ZR<br />

a,<br />

b<br />

: =<br />

I<br />

ZX<br />

a,<br />

b<br />

R 2 R R XR R<br />

( Ψ&<br />

) ⋅sinΘ<br />

⋅ cosΘ<br />

− P ⋅ &<br />

: = − P ⋅<br />

Θ<br />

YR<br />

a,<br />

b<br />

R<br />

I<br />

R<br />

I<br />

I<br />

ZR<br />

a,<br />

b<br />

I<br />

I<br />

a,<br />

b<br />

ZYZ<br />

a,<br />

b<br />

Equation 17.5-15<br />

I<br />

Equation 17.5-16<br />

R 2 ZR R 2 2 R<br />

( Θ&<br />

) − P ⋅ ( Ψ&<br />

) ⋅sin<br />

: = − P ⋅ Ψ&<br />

& ⋅sinΘ<br />

− P ⋅<br />

Θ<br />

When point (b) lies on X R its acceleration with respect to point (a),<br />

YR<br />

a,<br />

b<br />

XR<br />

a,<br />

b<br />

XR<br />

a,<br />

b<br />

XR<br />

a,<br />

b<br />

I<br />

a,<br />

b<br />

( ) ( ) 2<br />

R 2 2 R XR R<br />

Ψ&<br />

⋅ cos Θ + P ⋅ &<br />

A : = P&<br />

& − P ⋅<br />

Θ<br />

I<br />

I<br />

a,<br />

b<br />

I<br />

Equation 17.5-17<br />

I<br />

Equation 17.5-18<br />

R XR XR R<br />

R XR R R R<br />

( 2 ⋅ Ψ&<br />

⋅ P&<br />

+ P ⋅ Ψ&<br />

& ) ⋅ cosΘ<br />

− 2 ⋅P<br />

⋅ Θ&<br />

⋅ Ψ&<br />

⋅ sin<br />

A : =<br />

Θ<br />

ZR<br />

a,<br />

b<br />

I<br />

XR<br />

a,<br />

b<br />

a,<br />

b<br />

R<br />

I<br />

a,<br />

b<br />

XR<br />

a,<br />

b<br />

I<br />

I<br />

a,<br />

b<br />

I<br />

I<br />

Equation 17.5-19<br />

R 2 R R XR R<br />

( Ψ&<br />

) ⋅ sin Θ ⋅ cosΘ<br />

− P ⋅ &<br />

A : = − 2 ⋅ P&<br />

⋅ Θ&<br />

− P ⋅<br />

Θ<br />

17.6 Inertial Rate of Change of Acceleration Vector<br />

Differentiating inertial acceleration gives inertial jerk of point (b) with<br />

respect to point (a) expressed in frame (R),<br />

I<br />

I<br />

I<br />

a,<br />

b<br />

R 2 R<br />

R<br />

R<br />

[ ω × ] + [ ω&<br />

× ] ⎞<br />

⎟ ⋅ P&<br />

+ ϕ P<br />

R R R R<br />

Ja, b : = & P&<br />

&<br />

a,<br />

b + 3 ⋅ ωI,<br />

R × &P<br />

&<br />

a,<br />

b + 3 ⋅<br />

⎛<br />

⎜ I,<br />

R<br />

I,<br />

R<br />

a,<br />

b J ⋅<br />

⎝<br />

⎠<br />

I<br />

I<br />

I<br />

a,<br />

b<br />

Equation 17.6-1<br />

[ ] ( [ ] [ ] [ ] [ ] ) [ ] 3<br />

R<br />

R<br />

R<br />

R<br />

R<br />

R<br />

ω&<br />

& × + 2 ⋅ ω × ⋅ ω&<br />

× + ω&<br />

× ⋅ ω × + ω ×<br />

I,<br />

R<br />

I,<br />

R<br />

I,<br />

R<br />

ϕ<br />

J<br />

: =<br />

I,<br />

R<br />

I,<br />

R<br />

I,<br />

R<br />

Equation 17.6-2

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