14.02.2013 Views

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

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

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

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

Appendix I / Utilities / Axis Transforms<br />

_ _<br />

22.4.17 Differential Angle<br />

B<br />

A<br />

C<br />

A<br />

22.4-10<br />

B<br />

A<br />

C<br />

A<br />

B C ( Φ − )<br />

y : = sin Θ ⋅ sin Θ + sin Θ ⋅ sin Θ ⋅ cos Φ<br />

y<br />

><br />

y<br />

1<br />

≤<br />

⇒<br />

1<br />

⇒<br />

ξ<br />

C<br />

B<br />

ξ<br />

C<br />

B<br />

: =<br />

: =<br />

cos<br />

−1<br />

cos<br />

−1<br />

( y )<br />

A<br />

( sign ( 1 , y ) )<br />

A<br />

Equation 22.4-64<br />

Equation 22.4-65<br />

Equation 22.4-66<br />

V_ANGLE returns the differential angle between position vectors from point<br />

(a), the origin of a common frame (A), through points (b) and (c).<br />

22.4.18 Transformation Angle<br />

V_ANGLE<br />

y<br />

: =<br />

cos<br />

A A C<br />

( P , P , ξ )<br />

−1<br />

b<br />

⎛<br />

⎜<br />

P<br />

⎜<br />

⎝ P<br />

A<br />

b<br />

a<br />

, b<br />

c<br />

•<br />

⋅<br />

P<br />

P<br />

A<br />

c<br />

a,<br />

c<br />

B<br />

⎞<br />

⎟<br />

⎠<br />

Equation 22.4-67<br />

Equation 22.4-68<br />

ABS_ANG takes a YPR Euler triplet defining the orientation of frame (B)<br />

with respect to a frame (A), and returns the angle from X A to X B .<br />

22.4.19 Differential Angular Rate<br />

y<br />

><br />

y<br />

1<br />

ξ<br />

B<br />

A<br />

≤<br />

: = ABS_ANG<br />

B<br />

A ⋅ cos<br />

y : = cos Θ Ψ<br />

⇒<br />

1<br />

⇒<br />

ξ<br />

B<br />

A<br />

ξ<br />

B<br />

A<br />

: =<br />

: =<br />

cos<br />

−1<br />

B ( E )<br />

cos<br />

A<br />

B<br />

A<br />

−1<br />

( y )<br />

( sign ( 1,<br />

y ) )<br />

Equation 22.4-69<br />

Equation 22.4-70<br />

Equation 22.4-71<br />

Equation 22.4-72<br />

DA_RATE takes the PV of points (b) and (c) with respect to frame (A) at<br />

point (a), and returns the differential angular rate between the two vectors.

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!