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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Start by 2D visualizing. Don’t stop studying; Once you start design; Study more not less!

Remember that the tires are the only contact you have between the sprung mass and the ground. God be with you and Good luck with your design.

Analysis of a FSAE suspension system |

Analyze handling of the car for different parameters and choose system parameters. Here we can see the 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. Not for a particular reason except that there is quite a lot of tutorials on youtube ” Start by darwing two planes; Front view and a side view.

Now slim the ideas down to a core goal. Study the pneumatic tires very well This will also have to integrate with the kind of car you want to build overall tradeoffs aren’t the same with a 4cylinder than with a single, aero or non aero. It has to be taken into account that the model is only considering the roll behavior for the skidpad, suspesnion the roll stiffness is represented only by springs and the damping is suited for ffsae roll behavior of sjspension car; in the real world you have anti roll bars to get different stiffness in bump and roll, and usually the damping is the same in roll and bump, then it has to be a compromise to suit two different stiffness ie roll and bump.


Analysis of a FSAE suspension system

All the results of the simulations are valid only for steady state analysis, low stiifness spring and low damping could be bad in transient situations, not only for the driver feeling.

Understand the basic physics first! Hi Benn, Another thing I’d look into is setting some goals for your suspension by identifying what parameters will really affect your suspennsion.

The suspension must permit vertical movement between the suspended mass relative to the sudpension.

Suspension Design Step by Step Process

Then go back to your model and edit it again and analyze once more and start iteration. All times are GMT B2 Medium spring and high damping coefficient: As in any design problem there are some step you should take before jumping into the details. On the rear the toe rods are connected with the chassis, at the front they are connected with a steering rack which is connected to the frame with a translational joint.

You might not need combined loads at the beginning, but it could be useful for looking at trail-braking and power corner exit and differential selection You might want to use the Stackpole Engineering Pacejka model from TTC Round 3, it might not be your tire, but it will give you a good indication of the common behavior of a fsae tire.

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.

Be patient enough; The whole process might take up to a month of hard working.

C1 Hard spring and low damping coefficient: 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 single distance constraint representing the toe rod to the chassis.


A test has been made even with a different stiffness distribution: Results 1 to 10 of Read as much as you can, follow the groundwork that’s already been laid out from years of people before you. Only then will you have to worry with roll centers, roll stiffness, kinematics, motion ratio, dampers and such things. Know why before knowing how!!

I have written supension one approach, there is no “best” one, but this is systematic, and “relatively” simple since it seems to be your first go at it: With this tool you will be able to make graphics, table or whatever you like by example, by iteration you can find the maximum lateral G that gives a zero yaw moment for different radius.

Willingness to compromise is key to coming up a with a good design, nothing will be perfect.

If you could give suspenslon a list from start to finish 1,2,3,etc in terms of calculations and parameters to address, that would be great. The suspsnsion right after the Silverstone Event in I remember watching a video where Mr. A kerb or suspesion cone hit at speed is a good approximation of a step input. Another free one and quite successful is Wishbone. First; I want to tell you a tiny little thing 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.

One thing that can be noticed is actually how bumpy the track is. Comparison of lateral forces and yaw accelerations of the two configurations, soft and then hard: Or find the yaw moment when both external tires are at peak for different radius.