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

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Appendix D / Point Mass Dynamics<br />

_ _<br />

Setting the Euler roll angle to zero gives,<br />

YR<br />

a,<br />

b<br />

V : = P&<br />

− Ψ ⋅ P ⋅ cosΘ<br />

+ Θ&<br />

⋅ P<br />

XR<br />

a,<br />

b<br />

YR<br />

a,<br />

b<br />

XR<br />

a,<br />

b<br />

R<br />

I<br />

17-8<br />

R<br />

I<br />

YR<br />

a,<br />

b<br />

R<br />

I<br />

R<br />

I<br />

ZR<br />

a,<br />

b<br />

XR R ZR R<br />

( P ⋅ cosΘ<br />

+ P ⋅ sin )<br />

V : = P&<br />

+ Ψ&<br />

⋅<br />

Θ<br />

ZR<br />

a,<br />

b<br />

ZR<br />

a,<br />

b<br />

R<br />

I<br />

a,<br />

b<br />

YR<br />

a,<br />

b<br />

I<br />

R<br />

I<br />

a,<br />

b<br />

V : = P&<br />

+ Ψ&<br />

⋅ P ⋅ sin Θ − Θ&<br />

⋅ P<br />

R<br />

I<br />

Equation 17.4-10<br />

I<br />

Equation 17.4-11<br />

XR<br />

a,<br />

b<br />

Equation 17.4-12<br />

When point (b) is forced to lie on X R its velocity with respect to point (a),<br />

R<br />

a,<br />

b<br />

( ) T<br />

XR R<br />

R R<br />

P&<br />

Ψ&<br />

⋅ P ⋅ cos Θ − Θ&<br />

P<br />

V : =<br />

⋅<br />

a,<br />

b<br />

17.5 Inertial Acceleration Vector<br />

I<br />

a,<br />

b<br />

I<br />

I<br />

a,<br />

b<br />

Equation 17.4-13<br />

Differentiating inertial velocity to obtain inertial acceleration of point (b)<br />

with respect to point (a),<br />

A<br />

I<br />

a,<br />

b<br />

I<br />

R<br />

R R R I R R R R R<br />

( P&<br />

a,<br />

b + ωI,<br />

R × Pa,<br />

b ) + TR<br />

⋅ ( &P<br />

&<br />

a,<br />

b + ω&<br />

I,<br />

R × Pa<br />

, b + ωI,<br />

R P&<br />

a,<br />

b )<br />

: = T&<br />

⋅<br />

×<br />

Substituting for the transformation matrix derivatives,<br />

A : = & P&<br />

+ 2 ⋅ ω × P&<br />

+ ω&<br />

× P + ω × ω ×<br />

R<br />

a,<br />

b<br />

R<br />

a,<br />

b<br />

R<br />

I,<br />

R<br />

R<br />

a,<br />

b<br />

R<br />

I,<br />

R<br />

R<br />

a,<br />

b<br />

R<br />

I,<br />

R<br />

Equation 17.5-1<br />

R<br />

I,<br />

R<br />

P<br />

R<br />

a,<br />

b<br />

Equation 17.5-2<br />

The acceleration in frame (R) expressed in terms of the angular body rates,<br />

−<br />

XR<br />

a,<br />

b<br />

XR<br />

a,<br />

b<br />

YR ZR ZR YR<br />

R<br />

( ω ⋅ P&<br />

− ω ⋅ P&<br />

) + ( P )<br />

A : = P&<br />

& + 2 ⋅<br />

ϕ<br />

I,<br />

R<br />

a,<br />

b<br />

I,<br />

R<br />

a,<br />

b<br />

PX<br />

a,<br />

b<br />

Equation 17.5-3<br />

rR 2 XR XR YR ZR YR XR YR ZR ZR<br />

( ω ) ⋅ P + ( ω ⋅ ω − ω&<br />

) ⋅ P + ( ω ⋅ ω + ω&<br />

) ⋅ P<br />

IR<br />

ab<br />

IR<br />

IR<br />

ϕ<br />

PX<br />

IR<br />

: =<br />

ab<br />

IR<br />

IR<br />

IR<br />

ab<br />

Equation 17.5-4

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