Hi sir,I am xiao age22, I am now design the spring &damper system for our car. But I dont know how to design the bell cranks. How to design the bell cranks arms the dimensions?Which software and books should I read?Plz help me give me some clue!
Hi sir,I am xiao age22, I am now design the spring &damper system for our car. But I dont know how to design the bell cranks. How to design the bell cranks arms the dimensions?Which software and books should I read?Plz help me give me some clue!
Last edited by xiaolu; 11-26-2014 at 12:07 PM. Reason: suspension
Andrew Palardy
Kettering University - Computer Engineering, FSAE, Clean Snowmobile Challenge
Williams International - Commercial Turbofan Controls and Accessories
"Sometimes, the elegant implementation is a function. Not a method. Not a class. Not a framework. Just a function." ~ John Carmack
"Any sufficiently advanced technology is indistinguishable from magic" ~Arthur C. Clarke
If you make the bell-cranks out of cast iron and/or make them very big then they will act as an inerta which must be an advantage because F1 use them.
No wait... I though bellcranks REDUCE the unsprung mass....
The motion ratio we want is 1:1, I just dont know how to calculate the dimensions of the bell cranks such as the length of the bell cranks arm
Use angles, with the lines and points. Their lengths will bring truth to your question.
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Use mechanism analysis to solve for motion ratio. All that is needed is simple position analysis. Draw out the mechanism. Label your vectors. Determine number of knowns and unknowns. Each suspension link will be known in length and unknown in angle. The spring/damper will be unknown in length and angle. The height of the tire print location will be your input. Write vector loop equations (r1+r2+...=0). Write components of vector loop equations (cosines and sines for 2D analysis). You should have X number of unknowns and X number of equations. Program in matlab - using fsolve to solve. Approach the analysis with the intention of making it as general as possible in order to be able to quickly change the geometry of your suspension so you can easily run different geometries in the matlab program until you are satisfied with the resulting motion ratio.
Fitz Matush
Auto Seat Tester
Dalhousie University
Halifax, NS, Canada
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