REQUIREMENT FOR THE DEGREE OF. BACHELOR OF SCIENCE. IN. MECHANICAL ENGINEERING. FSAE Chassis and Suspension. Hello forum. I’m fairly new to FSAE and suspension design. One of the overwhelming problems that I’m having is figure out the step by step. This article deals with design of Formula SAE Suspension by considering various loads and their simulation on each component of the system.
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Sorry for any typing mistakes. How far up the helix can you get in your FSAE tenure? These specifications should be written in a table for fast reference. Then by changing tracks, ackermann, wheelbase, cg location, cornering stiffness, toe, etc you can see the effect the balance of the car in steady-state in this case. All the fitting is already done and all the equations of the zuspension written sispension -Write a simple code for the Four Wheel model that is able to calculate the slip angle for a given radius and steering angle, you will have to make assumptions about the slip angle at the rear.
They have Formula SAE cars and course already modeled into the software.
Analysis of a FSAE suspension system
Introduce yourself properly; namecountry, team You will have to make basic assumptions to estimate the values. Soft configuration; normal tire force and displacements of rims and chassis: Here we can see suspesion relative speed and angular speed that stabilizes after some laps, and the results are considered only for the stabilized part of the steady state corner.
C1 Hard spring and low damping coefficient: Note that the input in this case is cyclic. It should be very helpful too.
One thing that can be noticed is actually how bumpy the track is. With this you can use your tire model to obtain forces on the car, these forces will make you able to calculate load transfers, then re-calculate the tire forces, and iterate till you converge. Be patient enough; The whole process might take up to a month of hard working.
Fsae is a students engineering competition where student teams from around the world design, build, test, and race a small-scale formula style racing car. It’s skipped forward to the final 5. You’ll have to loose something in order to win the other.
Why were certain concepts used and others abandoned? The tire forces are modeled with a simple tire model with the following parameters: The frequencies for the chassis movement have been calculated with the linearization element and are from 3.
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The car right after the Silverstone Event in Willingness to compromise is key to coming up a with a good design, nothing will be perfect. Not for a particular reason except that there is quite a lot of tutorials on sjspension ” Start by darwing two planes; Front view and a side view. Now slim the ideas down to a core goal.
You won’t be able to be sure about the results unless you have tire data! Some function and associated specifications can be derived from the RuleBook 3.
Analysis of a FSAE suspension system |
The more times you go around the cycle the more you learn, the better your analysis gets and the more engineering you have in your design. Analyze handling of the car for different parameters and choose system parameters. One of the overwhelming problems that I’m having is figure out the step by step process in designing the suspension system.
Read as much as you can, follow the groundwork that’s already been fsad out from years of people before you. Comparison of lateral forces and yaw accelerations of the two configurations, soft and then hard:. The model is composed by the 4 wheels rim and tire fixed on the hubs which is connected with the uprights by a rotational joint, the uprights are then connected by two couples of distance constraints representing the a-arms and a suspensuon distance constraint representing the toe rod to the chassis.
Do you want to just keep the wheels on the car and complete the laps or do you want a car that is the fastest thing in a corner? I mean I’m just sharing what I know.
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I’m fairly new to FSAE and suspension design. One of the best softwares out there is OptimumK however it is not for free.
On the other side low chassis movements sometimes are useful to let the driver feel better the behaviour of the car, even if higher stiffness is penalising the grip, moreover the ground clearance required always in racing limits the use of even softer springs. Understand the basic physics first! Thanks for the information!
The time now is Here we can see suspensiom the relative speeds in red the longitudinal component of the chassis stabilizes in the second part of the simulation. Get the basics right first, the suspenssion only after.
The sine is used to represent road perturbations, depending on the frequency and the amplitude it could be roughness of the asphalt or a more severe pattern like circuit kerbs, as in our case.