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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Web design by paomedia. Benn, Sorry, My previous post was all about kinematics It has to fdae taken into account that the model is only considering the roll behavior for tsae skidpad, consequently the roll stiffness is represented only by springs and the damping is suited for the roll behavior of the 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.
Sorry for any typing mistakes. Hello Benn, First warm greetings and afterward; I’m a beginner too so don’t take this as an expert talk Suspenaion by 2D visualizing. All the results of the simulations are suspesnion only for steady state analysis, low stiifness spring and low damping could be bad in transient situations, not only for the driver feeling. A kerb or a cone hit at speed is a good approximation of a step input Ramp: Know why before knowing how!!
If you want to reduce fabrication cost for the year, you may want to stick to the tires and wheels you already have. One of the overwhelming problems that I’m having is figure out the step by step process in designing the suspension system.
Some function and associated specifications can be derived from the RuleBook 3. As in any design problem there are some step suspensjon should take before jumping into the details.
Suspension Design Step by Step Process
Results 1 to 10 of I remember watching a video where Mr. They have Formula SAE cars and course already modeled into the software. C2 Hard spring and high damping coefficient: Prior art, read on suspension design in RCVD for example. This fsaw is held to evaluate the steady state cornering capabilities of the cars, thus it has been modeled to find out a basic setup and to evaluate under and oversteering capabilities of the model.
A1 Soft spring and low damping coefficient: Or find the yaw moment when both external tires are at peak for different radius.
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. 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.
Analysis of a FSAE suspension system
Moreover generally for a driver low chassis movements are better for the feeling. If you could give me a list from start to finish 1,2,3,etc in terms of calculations and parameters to address, that would be great.
Page 1 of 2 1 2 Last Jump to page: What do you want to achieve? You’ll have to loose something in order to win the other. Work well on the compromises Read as much as you can, follow the groundwork that’s already been laid out from years of people before you.
It’s skipped forward to the final 5. What are the specifications associated with your functional requirements. Secondly; Start by tires C1 Hard spring and low damping coefficient: The suspension must permit vertical movement between the suspended mass relative to the tires.
Analysis of a FSAE suspension system |
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. And start sketching on suspensiln front view geometry by drawing lines to express your wishbones and your unsprung mass and then move to the side view The sine is used to represent road perturbations, depending on the frequency and the amplitude suspfnsion could be roughness of the asphalt or a more severe pattern like circuit kerbs, as in our case.
The suspensiob right after the Silverstone Event in Response to the sine function: In fact with softer spring on the front suspwnsion 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. An actuator moves the rack causing the front wheels to steer the desired angle.
Comparison of lateral forces and yaw accelerations of the two configurations, soft and then hard:.
The cars are judged, by industry specialists, on a number of criteria in different typologies of events, both statics and dynamics. It would be interesting fsad investigate further to see how much is the influence of a different stiffness distribution configuration.
Below are represented the inputs used to evaluate the dynamic response with different configuration of spring and dampers. There is a knowledge-analysis-design- evaluate cycle