presentation on baja

8/6/2019 Presentation on Baja

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Provide different steering settings depending on the users preferences. It utilizes a spring loaded l ocking mechanism to hold the steering

column in preset positions. It can also be moved completely out of the way to enhance ease of ingress/egress.

EXPECTED PERFORMANCE

CHARACTERISTICS

POWER & TORQUE:

Power to Weight ratio is (10.72/275)*1000 = 39

bhp/ton. Torque is calculated as follows.

BRAKING DISTANCE:

Using OEM master cylinders & assuming force applied by driver on pedal to be 85lbs = 386N, force on master cylinder = 386 x 0.26 (dist in m

from pedal to cylinder) = 100.36N

Now, this is equal to F x ram length, i.e. 100.36=Fx.08


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so F=1254.5N

Then, pressure delivered by the cylinder P=F/A =

1254.5/314.15e-4 = 39,933N/m^2

Assuming front: rear brake bias as 68:32 gives

P(f)=27154.4N and P(r)=12788.6N.

Hence, force applied by the rear cylinder F(r) = P(r)*A= 490.9e-4*12788.6 = 627.70N and similarly, F(f) =1333.1N.

Also Force applied on the discs by the cylinder F(R) =

2*F(r)* = 2*627.70*0.3 = 376.62N and F(F)=798.7N.

Which implies torque on each disc in the rear = T(R)=F(R)*Radius = 376.62*0.06 = 22.6N and that on thefront (with radius of the disc=0.08 m)

T(F)=63.9N

Finally force per wheel in the rear becomes F (Rw) =T(R)/Radius of the wheel (R(w)) = 22.6/0.292 = 77.36Nand also F(Rr) = 218.72N.

Thus, net deceleration Acc=[2*F(Rw)+2*F(Rr)]/Weight of the vehicle(W) = 2(77.36+218.72)/3500 = 16.9m/s^2.

And, Stopping distance D(s) = V^2/2*a =

(14*14)/2*16.9 = 2.89m.

C.o.G & WEIGHT DISTRIBUTION:

C.o.G calculations weredone by considering theorigin at the front end for X, at the chassis for Z and at the wheels for Y. The final value for Z was

arrived at after adding the ground clearance.

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Stability Analysis:

According to the National Highway & Traffic SafetyAdministration, most vehicle rollovers occur by tripping over low obstacles. For a Baja

vehicle, this would alsobe the case. Then stability is obtained from thefollowing graph.

fig xvi

Static Stability Factor (SSF) = T/2H where T= track

width and H= height of centre of gravity.

SSF=1324/(2x553)= 1.19

Using the graph, this gives our vehicle a four star

rating.

FULL VEHICLE 3D VIEWS


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fig xvii

fig xviii

fig xix

VEHICLE TECHNICAL SPECIFICATIONS

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CONCLUSION


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This being Team Stratos first attempt at Baja SAE ,our teams objective was to design and build a vehiclethat can complete all competition

events withoutfailure. All designs and calculations were done torealize this aim.

Reliability and safety were considered paramount,keeping the nature of the end-user in mind. Finally, ahigh level of manufacturability was

incorporated toensure feasibility for mass-production.

REFERENCES

1.Chassis Engineering by Herb Adams2.Automotive Mechanics by Crouse Anglin

3. Race Car Vehicle Dynamics by Millikens &

Millikens

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