- #1
mechdesignron
- 9
- 0
FW+(Spring Force 2)K2N2(D2-Delta)
(spring force 1)K1N1(D1+Delta)
I have a spring set(springs in parallel) on top of an object and a spring set supporting the object. The weight of the object is represented by FW. The bottom springs are F1 and the top springs F2. There is preload on the springs, represented by D1 & D2 repectively. I want to know how far the object will fall (Delta) in the given system.
I came up with this formula.
FW+K2N2(D2-delta)=K1N1(D1+delta)
Some magic algebra and Presto:
delta=(FW+K2*N2*D2-K1*N1*D1)/(K1*N1+K2*N2)
OK my problem. It doesn't seem to work. I plugged this into my handy-dandy spreadsheet and when I change the K value-keeping them both the same- it works fine. The higher the K the less the object falls. but when I change the compressed distance -keeping them both the same-, (which should, by hooks Law make the spring stiffer), does not change the distance the object moves. Please help.
Thank you
(spring force 1)K1N1(D1+Delta)
I have a spring set(springs in parallel) on top of an object and a spring set supporting the object. The weight of the object is represented by FW. The bottom springs are F1 and the top springs F2. There is preload on the springs, represented by D1 & D2 repectively. I want to know how far the object will fall (Delta) in the given system.
I came up with this formula.
FW+K2N2(D2-delta)=K1N1(D1+delta)
Some magic algebra and Presto:
delta=(FW+K2*N2*D2-K1*N1*D1)/(K1*N1+K2*N2)
OK my problem. It doesn't seem to work. I plugged this into my handy-dandy spreadsheet and when I change the K value-keeping them both the same- it works fine. The higher the K the less the object falls. but when I change the compressed distance -keeping them both the same-, (which should, by hooks Law make the spring stiffer), does not change the distance the object moves. Please help.
Thank you