If your team is new, focus on the fundamentals of mechanical engineering and Design of Machine Elelments since the judges will test your ability and feasibility to fabricate your design into an ATV.
Make sure all the members going for this round are well aware of the rule book guidelines (the values particular like tab thickness) and technical specifications of your design. Have a cogent explanation to why are you applying a particular part over the other. eg: Why have you applied a 10 G force for frontal impact on your chassis? ( A commonly asked question) or why a CVT and not manual gear box?, etc. Apart from the technicalities of your design, make sure you work well on the Project plan (A self explanatory Gantt chart is suffice) and the Cost Estimation. During my second time, they skipped all the slides initially and jumped directly to the project plan and cost estimation slides, asking about 3–4 questions from each slide. DFMEA is another topic you should be investing your energy upon.
If you are an Old Team, the judges would emphasize more about the failure you had (if any) during the previous year and how do you plan to prevent those in t upcoming design. Work on design optimizations, new mechanisms and innovations since they expect you to bring up something new using your prior experience and skills. You might face questions which could be harder than those asked to a newer team but a scientific reasoning and a good confidence would definitely take you through.
Make contacts with other teams on the first day of the Virtual round. This would really help you a lot in the log run! Students at BAJA India are really helpful and friendly since they share the same passion and you can discuss about your queries or any problem you are facing with your design to get a better solution/additional opinion. You can also approach teams going before you for the presentation round and get to know their feedback (really helpful!).
Try working on a design which is ready to manufacture so that you don’t have to apply reverse engineering during the manufacturing phase of your ATV. This is really laborious and only a handful of teams follow this approach. But doing this would require you to deeply study the design of each component of your vehicle resulting is reasonable answers to the judges in Virtual round, facile and expeditious manufacturing and thus fulfilling the overall objective of this competition – To widen the sphere of your knowledge and make you a BETTER Engineer.
Following points will be sufficient for your Presentation
- Project Plan
Prepare a project plan in MS Project and project the contour plan ensuring all the dependent assemblies must be given time accordingly
- Design / 3D View
Prepare a good cad model as per described constraints of BAJA rule book.
Ensure proper space in the roll cage for sub assemblies.
Check your Roll cage on impact test(front, rear, roll over, side impact) and formulate a table for the results obtained.
Show the relative figure of roll cage and human body for ergonomics section, and fish eye view of the driver from the seating position
Material selection and total estimation of weight of roll cage and vehicle.
Calculate the expected center of gravity.
- CAE (Analysis)
Fix your wheel track distance, and the calculate the steering specification
Mention all the angles included in steering assembly such as king pin inclination, steering angle, camber, caster, toe in angle.
Calculate steering effort, turning circle radius.
Calculate the weight distribution, stationary vehicle while braking and acceleration.
Design of spring and damping ratio.
Calculate the dimensions of arm length, inclination angle,
Maximum travel of the arm and mounting of suspension in the roll cage
- Brakes & Tyres
Mention the type of brakes used
Stopping distance at various speeds
Braking force calculation
A circuit diagram containing master cylinder to brake pads.
Select the type of gear box.
Calculate the gear ratio, gradeability factor, acceleration, tractive effort.
Calculate the maximum speed in all gears
Prepare a graph for engine RPM vs speed vs tractive effort in all gears.
DFMEA is the most important slide in the presentation, judges will surely question you so, allocation of RPN number must be choosen wisely.
- Design Validation
Make a design validation plan and for all the sub assemblies which will ensure completion of target within time and with quality allocate a team member in each sub assemblies
- Cost Estimation
Bring innovations into your ATV, every team comes to sell the same ATV buggy. This is where you diffrentiate yourself from other?
- Go Green
If you have any specific idea about reducing the smoke emission, or conrolling the CO,CO2, HFCs level, or reducing the noise level then allocate one slide, but be specific and have knowledge in depth.
- Team Management
In the last slide you may include team management plan that makes an good impact too.
Prepare a presenting team from now itself so that they must be clear about their job, and in front of judges a smooth question hour would be tackled.
Sample PPT for Virtual : Apply Here