- (1+2 Points) Introduction to problem statement, including background and why it is useful/interesting/entertaining to solve.
Formula race cars are constantly pushed to the limits of speed trying to achieve the fastest laps possible. A large part of the aerodynamics of the car are determined by the rear wing airfoil. In many cases, the driver is able to toggle the wing orientation to either prioritize low drag, or to redirect the air down to increase the weight of the car to generate greater torque on turns. This toggle typically relies on a pivot point around the rear of the airfoil that can open and close a flap. However, the shape of the airfoil remains the same when open or closed, only the orientation changes. Our goal is to design an airfoil that will be able to change its inherent shape to conform to the requirements of a desired outcome.
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Problem Complexities:
Since wing elements need to be complex profiles to keep airflow attached, they cannot simply be pivoted about their axis for maximum efficiency. Airflow designed for high downforce may require camber angles (up-curved airfoils) whereas low drag configurations often require the zero camber (symmetrical). Therefore, it is paramount to create a wing that can actively adjust its native camber angle for the highest performance.
The mechanism for this is very difficult because we need to design something that can pull and bend the surface of the wing to adjust its camber angle. This cannot be accomplished with a simple mechanism because the surface of the airfoil must be supported on its full surface.
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Mechanism Proposition:
The primary idea we have is to create a mechanism that manipulates links that control points near the middle points of the upper and lower edge as well as a member to manipulate the trailing edge of the wing. By articulating these points we should be able to control the fail shape to our liking. We will actuate these control points with a series of four-bar linkages that selectively pull on the airfoil surface.
- (1+4 Points) Proposed scope of work for final project.
– How much of the solution do you aim to complete as part of the final project?
Final Project Tangibles:
We intend on creating a full-size, working, bendable airfoil. For the demonstration, we will show this mechanism in action with a small RC servo to demonstrate its feasibility and practicality.
– What analysis will you need to perform prior to fabrication?Analysis Goals:
We will create curves for each of the wing surface pickup points and design a mechanism to accomplish these curve sweeps. If we have time, we will run CFD (computational fluid dynamics) to assess the performance of this wing.– What is the most exciting part of building this robot for you? What is the most challenging
Design Excitement vs Challenges:
The most exciting part of building this project is designing something that could be used in the real world. We are both on Longhorn Racing Electric and the thought of innovating something new to use in racing is fascinating and motivating.
The most challenging part of building this mechanism is validation. Ensuring that the airfoil surface can bend and warp appropriately, and also be a good airfoil surface, will be a challenge.
0+2 Points) Preliminary design ideas:
We want to implement a mechanism that is situated inside the airfoil itself. The plan would be to create a linkage inside the airfoil where the link lengths correlate to the distance each section can move, and the actuated mechanism will determine the pathing of critical points that affect the airfoil's performance.