Formula SAE (FSAE) is a university student competition, in which a formula style race car is designed, built and tested. It is run by the Society Automotive Engineers. The design of suspension is an important aspect of the competition due to its nature. With recent rule changes it is becoming the case that to remain competitive it is necessary to incorporate
aerodynamic down-force. This significantly affects the suspension design.
The FSAE competition imposes constraints on the design of the car. These constraints must be followed to insure the car is fit for competition. The constraints discussed in this thesis were due to both the team and the rules requirements. Due to the scope only the suspension related limitations were considered.
The object of this thesis is to achieve a suspension geometry design for a Formula SAE car which integrates the use of aerodynamics for UQ Racing. This is because there is little
knowledge around suspension with a focus on aerodynamics on the team. The UQ Racing team wishes to move in this direction with the requirement that the suspension design be modified. This document is to act as a guide for suspension design for future team members and to introduce an aerodynamic focus. In the initial design only the suspension kinematics was considered, everything else outside the scope. Optimisation of other parameters, such as damping rates, was to be considered in simulation of the car.
To conduct optimisation of the suspension design an initial design was first required. This was achieved through a steady state cornering analysis. This allowed the quantitive
determination of a number of key parameters. The remaining geometries and car properties were determined using a combination of qualitative and quantitative methods.
The importance of packaging in the design was highlighted. To ensure components fit and that the design would work CAD was used to draw the geometry and ensure range of
movement. This involved drawing the suspension system and defining the interfaces between the different components.
The suspension kinematic parameters were optimised in a suspension analyser program, SusProg, to ensure adherence of the design to the design requirements.
It was initially planned to optimise the dynamics of the design using a full car model. This was to be done in a multi-body dynamics program known as ADAMS Car. However an error with the commercially available FSAE template prevented this. Some minor analysis was conducted for each individual suspension system however a full vehicle analysis could not be completed. Instead a simple analysis of the standard car model was conducted. The analysis consisted of the optimization of common suspension parameters. This was done through simulations of the vehicle in two manoeuvres, constant radius cornering and deceleration. The purpose of the simulations was to outline the use and capabilities of ADAMS Car.
The parameters investigated were geometric in nature and were varied. Cornering performance was assessed by investigation of the amount of lateral force that the tyres produced. The longitudinal performance was assessed by minimization of the pitch angle of the vehicle.
Even though the initial suspension design presented could not be optimised the use of ADAMS Car was outlined. This allowed some investigation into the method of vehicle optimisation. As such it is expected that in the future UQ Racing will be able to perform simulation of a vehicle and improve its performance.
- Она через силу улыбнулась. - Остальное будет зависеть от. Сьюзан знала, что остальное - это штурмовая группа АНБ, которая, перерезав электрические провода, ворвется в дом с автоматами, заряженными резиновыми пулями.