Tek-Tips is the largest IT community on the Internet today!
Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!
-
Congratulations cowski on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!
Calculation method of progessive stage/rate leaf springs.
- Thread starter mitra1987
- Start date
GregLocock
Automotive
use the sae leaf spring design manual
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376
GregLocock
Automotive
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376
- Thread starter
- #5
Thanks Greg & israelKK
My basis of design calculations is SAE J 788. But in actual samples it is always observed that stage 1 stiffness is greater than calculated. For example if required stiffness values are 6 and 13 kgf/mm, then observation is 8.8 and 13 kgf/mm. Snapshot for concerned spring system is attached.
My basis of design calculations is SAE J 788. But in actual samples it is always observed that stage 1 stiffness is greater than calculated. For example if required stiffness values are 6 and 13 kgf/mm, then observation is 8.8 and 13 kgf/mm. Snapshot for concerned spring system is attached.
As stated in SAE J 788 1982 page 53 2nd column regarding the load deflection diagram "It has been drawn without considering such details as the change in moment arm length when the spring is deflected from positive camber to flat to negative camber". Add to this friction in eyelets, friction between leaves, etc., You also have to put tolerances for the rate value it should be at least +/- 15% due to the complexity of multi leaf spring compared to single leaf horizontal beam spring.
GregLocock
Automotive
If you really want to get the rates right then there is no substitute for a crude beam element model. This will account for the influence of shackle angle, and the camber effect.
I'd use matlab, but here's an examplf ro a single leaf I did in Smath
You will also be able to model the effect of the second stage more accurately, although that gets very tricky.
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376
I'd use matlab, but here's an examplf ro a single leaf I did in Smath
You will also be able to model the effect of the second stage more accurately, although that gets very tricky.
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376
- Status
Similar threads
- Locked
- Question
- Locked
- Question
- Locked
- Question