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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Secondly; Start by tires 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?
Results 1 to 10 of 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.
God be with you and Good luck with your design. The car right after the Silverstone Event in Study the pneumatic tires very well The time now is The vehicle presented in this project is the FSAE prototype of the University of Padua, which competed in the season of the series.
They have Formula SAE cars and course already modeled into the software.
Analysis of a FSAE suspension system |
Soft configuration; normal tire force and displacements of rims and chassis: Remember that the tires are the only contact you have between the sprung mass and the ground. In fact with softer spring on the front the difference is a little higher, but in every skid pad simulation the grip limits of the car are NOT reached, and consequently, as is evident in the yaw acceleration graphs, the car remains neutral.
First; I want to tell you a tiny little thing And start sketching on the front view geometry by drawing lines to express your wishbones and your unsprung mass and then move to the side view Then; Put the whole geometry on a kinematics analysis software Contact Us Archive Top. 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.
The tire forces are modeled with a simple tire model with the following parameters: Is there a reason why many have converged on a certain concept? Get the basics right first, the details only after.
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Detail of the CAD front right wheel assembly view from the inside of the car. The cars are judged, by industry specialists, on a number of criteria in different typologies of events, both statics and dynamics.
A1 Soft spring and low damping coefficient: C2 Hard spring and high damping coefficient: All the results of the simulations are valid only for steady state analysis, low stiifness spring and low damping susoension be fsea in transient situations, not only for the driver feeling. Video of the Eigenmode of the chassis at 3. This will also have to integrate with the kind of car you want to suspenaion overall tradeoffs aren’t the same with a 4cylinder than with a single, aero or non aero.
Hi Benn, Another thing I’d look into is setting some goals for your suspension by identifying what parameters will really affect your laptime. A kerb or a cone supsension at speed is a good approximation of a step input Ramp: 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.
Thanks for the information! 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 would be fsse to investigate further to see how much is the influence of a different stiffness distribution configuration. Comparison of lateral forces and yaw accelerations of the two configurations, soft and then hard: The dynamic response of other inputs will be presented only for the two better configurations on the step input.
In the skid pad the difference between the two configurations is very subtle because of the fact that in steady state is the stiffness distribution, which is the same, that gives you some difference. You won’t be able to be sure about the results unless you have tire data!
Suspension Design Step by Step Process
Be patient enough; The whole process might take up to a month of hard working. Work well on the compromises OptimumLap would be a good place to start as it will give you a decent idea of what really affects laptime on one of these cars.
Analyze handling of the car for different parameters and choose system parameters. Claude Rouelle who is a famous FSAE judge and president of one of the leading companies in vehicle dynamics softwares “OptimumG” saying that if you know the forces acting on your tire contact patch then you will be able to choose a suspension template. What do you want to achieve?
What are the functional requirements, for the suspension sub-system, these should emerge from the functional requirement of the car. 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. Is there something that can be innovative to the design?
Another free one and quite successful is Wishbone. Hello Benn, First warm greetings and afterward; I’m a beginner too so don’t take this as an expert talk I remember watching a video where Mr.