Come join us at our Unveiling!

1 04 2014

Unveiling Invite 2014





DEW Engineering

16 03 2014

Thank you very much to our huge sponsorship from DEW Engineering here in Ottawa! They are awesome to work with helping us make lots of parts!





Updates!

18 11 2013

Nov.15.2013

Designs and drawings all getting finalized! We are excited to go to FSAE Michigan and North 2014 once again next year!

 

October.19 – 20. 2013

We had an awesome time at the UoT shootout, where we went from cold and dry to the lovely cold and wet! It was amazing once again to meet and see all the teams coming out! Till the next time we meet.

 

​September 4.2013

Sorry for the slow updates. We have been busy, preparing, training and testing the new members through the summer. The design cycle never stops, now we just wait for the UoT Shootout!

 





Thank You Princess Auto

18 03 2013
The Ravens Racing Team would like to thank Princess Auto on Ages Drive in Ottawa for donating over $2,000 worth of tools to be used in the Team’s shop and in the newly designed pit cart which will be used at competition this year. A good set of tools are essential to the build of a hybrid race car and with Princess Auto’s generous donation this years team will have the luxury of working with the best quality tools you can find in the Ottawa area. To all the staff and Terry at Princess Auto, we look forward to working with you in the future and representing your brand with a top contending car at the Formula Hybrid Competition this year.
Picture: Mark Cohen from the Ravens Racing Team accepting two shopping carts full of tools from Terry Legere of Princess Auto
princess




Thank You Swagelok

18 03 2013

The Ravens Racing Team would like to thank Swagelok for their generous donation of $1500 on January 28, 2013. Swagelok has also agreed to retrofit the RR13 (this years car) with all the necessary plumbing and fitting requirements for the brake system to be used at this years international competition in Loudon, New Hampshire. Kirk and Christian, we look forward to you driving the car at this years sponsor appreciation day!

Underneath Picture:
Bob De Snoo accepting a cheque from Swagelok on behalf of the Ravens Racing Team during an info session put on by Christian and Kirk from Swagelok.
swagelok




Flexures: Spherical Bearings Be Warned

7 02 2013

Like most autocross cars, our car uses spherical bearings to attach the a-arms and z-arms to the frame.  A new design currently under development will replace these bearings with flexures, solid components that allow for movement in the vertical direction without moving parts. This design is undergoing physical testing to validate the FEA simulations and to ensure that the car will withstand the forces that occur during a race. Our team is simulating this component using both Pro Engineer and real world MTS testing to analyze the stress distributions and to ensure the component performs to specification.  So far the flexures have performed exactly as predicted by simulation and are slated for implementation on the next iteration of the car.  See the figures below for a selection of the FEA simulations and MTS testing.

flexure

Figure 1: Flexure (This is designed to bend along the thin section)

yielding

Figure 2: Yield Simulation (Red indicates areas of high stress)

buckling

Figure 3: Buckling Simulation

mts testing

Figure 4: MTS Testing (Testing the critical buckling load)

surface strees top

 Figure 5: Surface stresses due to bending for front upper arm

Fatigue upper

Figure 6: Fatigue life of the flexures on the front upper arms





Revving it Up with Powertrain

30 03 2011

Axle Design

This is the first year that Ravens Racing will be designing an All-Wheel Drive car.  The rear axle is driven by a gas-powered motor and each front wheel will be driven by a separate electric motor.  With an electric motor driving each wheel in the front, the need for a differential is eliminated.  A chain drive system will increase the torque from the electric motors.  The front gear ratio is 3.38:1, which when combined with performance curves of our electric motors, puts us alongside the top teams at competition for electrical power.  The front axle is unique in that it must supply power to driven front wheels that turn.  In order to do this there must be two types of CV joints; a plunging joint that allows the half-shafts to move longitudinally and vertically, as well as a high-angle joint that allows the wheels to turn while still transferring power.  For the RR11 we will be using a tripod style joint as our inboard plunging joint, and an Rzeppa high angle CV Joint as the outboard joint.   The rear axle will use a cam and pawl type locking differential.  The gas powered motor also uses a chain drive system to increase the torque applied to the wheels.  The rear gear ratio is 3.07.

Internal combustion Engine Integration

This being the first year entering a hybrid race car in competition, a lot of changes have been made to the car. This year we chose to go with an all wheel drive race car that has a gas powered engine to drive the rear wheels and a pair of electric motors to power the front wheels.  However competition rules regulate the engine to have a maximum displacement of 250cc. A 2008 yamaha WR250x supermoto motorcycle was purchased as a donor for the engine and electrical system.

Since the engine was removed from a motorcycle, various components have to be modified and retrofitted to fit the race cars frame and driver controls. The shifter in the engine has been modified from the standard foot pedal to a cable and hand shifter system. The throttle and clutch cables are changed from a hand throttle and  lever, both to foot pedals.

The engine was taken to a local motorcycle dealer for a dynamometer test to see what kind of performance the engine was capable of. It was found that it has 25hp and 16 lbs/ft of torque. In comparison to last years race car with a 510cc engine, this years 250cc engine produces about the same performance values.

Hybrid Electric Drive

The hybrid design of the vehicle utilizes a parallel configuration where the power plants work independently from each other. This allows for us to take advantage of the benefits of both the internal combustion, which provides maximum torque at high speeds, and the electric motors which operates better at lower speeds. The electric portion of the vehicle is powered by two permanent-magnet DC Agni 95R motors capable of producing up to 26kW of power and 53Nm of torque. The motors are powered from six Odyssey Extreme Racing AGM batteries configured in series and capable of producing  72V and up to 800A of current.

The electric control system of the vehicle receives all inputs from the driver and sensors, calculates the desired response, and outputs the signal to the appropriate device. The brain of this system is a self-programmed based Arduino microcontroller. The control algorithm is programmed in C and monitors the temperature of the electric devices and outputs the desired response of electric motor torque output.








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