GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VII (OLD) EXAMINATION — WINTER 2018
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Subject Code: 170203 Date: 26/11/2018Subject Name: Vehicle Dynamics
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
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2. Make suitable assumptions wherever necessary.3. Figures to the right indicate full marks.
Q.1 (a) Define following vehicle dynamic terminologies. [07]
1. Euler angles 2. Camber thrust 3. Brake factor
4. Soft and Hard suspension 5. Slip angle 6. Understeer and Oversteer
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7. Roll Steer(b) What is traction limited acceleration? Formulate the equation for maximum traction force of rear wheel drive having solid rear axle with non locking differential. [07]
Q.2 (a) With the help of road performance curve explain acceleration, gradability and drawbar pull. [07]
(b) Derive the equation to calculate the dynamic axle load for the following condition of four wheeler. [07]
1) When the vehicle on level ground under static condition.
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i1) When the vehicle on grads with low speed acceleration.OR
(b) Ilustrate tire print and hydroplaning phenomena. [07]
Q.3 (a) Explain Lumped mass and Euler angles. [07]
(b) Explain Anti lock Brake system. [07]
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OR
Q.3 (a) Explain Vehicle aerodynamics forces. [07]
(b) Define Roll center and roll axis. Locate the roll center for the following suspension mechanism. [07]
1) Hotchkiss suspension. 2) Positive swing arm independent suspension.
3) Macpherson strut suspension. 4) Four link rear solid axle suspension.
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Q.4 (a) Explain : Brake factor, Brake proportioning and Braking efficiency [07]
(b) What is braking coefficient? Explain the parameters which affect braking coefficients. [07]
OR
Q.4 (a) Explain: How the vehicle ride performance can be improved by semi or active suspensions? [07]
(b) Explain all the factors of ride comfort. [07]
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Q.5 (a) Explain: How the vehicle ride performance can be improved by semi or active suspensions? [07]
(b) Explain Vehicle drag components. [07]
OR
Q.5 (a) Explain Vehicle aerodynamics forces. [07]
(b) Explain: How four wheel steering system improve low speed maneuverability and high speed cornering? [07]
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