ர 000001412103 Pages: 2

Reg No.: Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

Seventh Semester B.Tech Degree Examination (Regular and Supplementary), December 2020

Course Code: AU403
Course Name: VEHICLE DYNAMICS

Max. Marks: 100 Duration: 3 Hours
PARTA
Answer any two full questions, each carries 15 marks. Marks
1 ஐ Define DOF. Also, explain damped vibration. (5)

b) Explain how the tire dynamics affects the performance of the vehicle during (10)

cornering.
2 a) A Leyland truck has a gross vehicle weight of 89026 14. Engine displacement is (10)

10൩, power 77.3 kW at governed speed of 2400 rpm and maximum torque
345.8 Nm at 1400 rpm. Rear axle ratio is 6.166: 1. Fourth speed reduction ratio
in transmission is 1.605: 1, drive line losses amount to 10.7 kW at 2400 rpm and
6.3 kW at 1400 rpm. Tyre size is 0.4572 m x1.016 m (effective wheel diameter
0.950 m), frontal area of truck is 6.95 ന. Calculate the grade which vehicle can
climb in fourth gear in still air conditions: a) at governed engine speed b) at
speed of maximum torque in the equation R = KW + K, AV’, Where K = 0.044,
K, = 0.0462 and V in kmph.

b) What are the factors influencing cornering stiffness? (5)
3 ஐ Discuss in detail the road performance cures for acceleration, gradability and (8)

drawbar pull.
b) Explain i) Power consumed by tires ii) Tire vibrations iii) Tire stiffness (7)
PART 13
Answer any two full questions, each carries 15 marks.

4 a) Acar weighing 21336.75 N has a static weight distribution on the axles of 50:50. (10)
The wheel base is 3 m and the height of centre of gravity above ground is 0.55
m. If the co efficient of friction on the highway is 0.6, calculate the advantage of
having rear wheel drive rather than front wheel drive as far as gradability is
concerned, if the engine power is not a limitation.

b) Describe the theory of chasis spring. (5)
5 a) Describe in detail about the requirements of a good suspension system. (7)

Page | of 2