Change in spring length per unit vertical displacement of the wheel center relative to the sprung mass.
Computed by:
SVCRAT
Input Variables Used:
■Front and rear compliance matrices
■Spring Body attachment markers
■Spring Suspension attachment markers
Method:
SVC calculates a temporary compliance matrix to relate the wheel and spring motion. For full-vehicle models, the body degree of freedom is then removed from the compliance matrix.
Determine the normalized suspension to body vector
LSL = SQRT( LSPRNG(1)**2 + LSPRNG(2)**2 + LSPRNG(3)**2 )
Where:
LSPRNG(1) - Global X displacement of spring attachment on body wrt spring attachment on suspension
LSPRNG(2) - Global Y displacement of spring attachment on body wrt spring attachment on suspension
LSPRNG(3) - Global Z displacement of spring attachment on body wrt spring attachment on suspension
LSPRNG(1) = LSPRNG(1) / LSL
LSPRNG(2) = LSPRNG(2) / LSL
LSPRNG(3) = LSPRNG(3) / LSL
Compute change in spring length due to vertical force at wheel center (dot product of spring-end compliance and spring vector).
DS = CTEMP(7,3) * LSPRNG(1) + CTEMP(8,3) * LSPRNG(2) + CTEMP(9,3) * LSPRNG(3)
Spring Ratio = CTEMP(3,3) / DS
Spring Ratio = 1/Spring Ratio