DRS (Drag Reduction System)
By:
Patrick Antar 7664257
Lachlan Wilton 7656890
Theodore Johnson 9741194
Daniel Loi 9501258
Taking a step backwards• What is a DRS and why?A Drag Reduction System on the rear wing helps with reducing the overall drag generated by the car with the help of elevating a flap element, reducing its angle of attack.
It can significantly increase the straight line speed of a racecar.
My group and I are assessing its effectiveness and determining how much of a benefit it could bring to this year’s Team Swinburne’s electric racer.
DRS OFF
DRS ON
DRS gif activation
Rules and Regulations• For rear wing:
In plan view, no part can be further rearward than 250 mm rearward of the rear of the tires.Cannot be wider than the outside of the rear tires measured at the wheel hubs.Cannot be higher than 1.2 m above the ground without a driver onboard, from the side view.
Keep-out zones
Rules and Regulations • For activation mechanism (Compressed gas, etc..)
Constraints• Total weight limit of 5kgs with DRS.• The design should satisfy all the competition rules.• Not more than 10mm of deflection, measured at furthest point from t
he chassis, in any direction at maximum loading.• Should not interfere with other critical mounting points on the rear ch
assis.• The aerodynamic design should not increase the overall aerodynamic
drag by 5- 10% of the baseline(with no wings (+DRS) but with undertray) model.
Motion Transfer
Sub-Systems
Actuator Mounting LinkageInput High/
LowInboard/Outboard
# of points Direction Materi
al
ElectricalLinear High Inboard Single Compressi
on WireRotationa
l Low Outboard Dual Tension SolidMagnetic N/A N/A N/A N/A N/A
FluidPneumati
cHydraulicManual
• Initial design evaluation gave us a total of approximately 32 different potential designs.
• To reduce the design decision process instead of each team member accessing 8 designs covering different areas of study, each team member has been assigned a single area of study that covers a number of potential options.
• There are three subsystems required, for the car.• An input motion, a way of converting that motion into an appropriate vertical linear motion and a way of transferring that
force into a rotating
Bell crank Scissor-like jack
Linear pneumatic cylinder
Mechanical Inputs
ManualLevers & FootpedalsNo additional energy source.Cabin Space.
FluidSelf Contained, linear.HydraulicHeavy, messy, flammable.
Pneumatic• Cheap.• Relatively light. • Linear motion.• Clean. (Air)• Compact.• Well understood.
ElectricalRotational.DC motors, Stepper Motors, Servos.Small, cheap, light, accurate, rotational to linear motion possible.Linear Actuator.Microcontroller, drain on the battery.Electromagnets/SolenoidsLow force, Expensive.
ComparisonGOOD BAD
BAD GOOD
GOOD BAD
BAD GOOD
BAD GOOD
BAD GOOD
GOOD BAD
1-35 MPa 0-800 KPa
AccuracyCleanlinessControllabilityFlammabilityInexpensiveLeakage/failure
LubricationPressure regions
PNEUMATICSHYDRAULICS
Our choice: PNEUMATICSIt is the best for our application after looking at the comparison.There still is a plenty of decisions to make:
• Cylinder size• Ports size• Inlet and exhaust valve flows• Air pressure• Bore and length of the hoses• Load against which cylinder is working
We also have the choice between a single acting or a double acting cylinders.• A single acting with spring return seems to be best for our application
Other factors (Calculations, activation method…)
Means of activation
Pushing effective area Pulling effective area
Effective area for a given force
Summary• DRS activated by the press of button and will spring back to its initial
position once the driver lets go
• Pneumatics provide an safe and relatively light and inexpensive means to achieve it
• Packaging will be in one of the side pods away from the driver
• Strategically deployed to last the entire competition.
THANK YOU
References• https://
www.formula1.com/content/fom-website/en/championship/inside-f1/rules-regs/Drag_Reduction_System.html• http://
www.rc-expert.com/110-2013-f1-drs-movable-tail-wing-assembly-for-tamiya-f104-rc-car-with-servo-drswing-p-5503.html• https://upload.wikimedia.org/wikipedia/commons/0/0d/Pneumatic_c
ylinder_(animation).gif• http://www.peninsularcylinders.com/HH_Links/HH_%20Pictures/Spri
ng%20Return%20-%20Extended.jpg
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