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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VII (NEW) EXAMINATION - WINTER 2018
Subject Code: 2170203 Date: 15/11/2018
Subject Name: Vehicle Dynamics
Time: 10:30 AM TO 01:00 PM Total Marks: 70
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Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
Q.1 (a) What is Vehicle Axis System and Earth Fixed Axis System? 03
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(b) Derive the equation to calculate the dynamic axle load when the vehicle 04 on level ground under static condition.
(c) Explain vehicle fixed co-ordinate system with neat sketch. 07
Q.2 (a) Explain lumped mass of vehicle. 03
(b) List the various shape of vehicles and give the value of aerodynamic 04 drag coefficient for each shape of the vehicle.
(c) What is the difference between power limited acceleration and traction 07 limited acceleration? Derive an expression of tractive effort with respect to limiting engine power.
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OR
(c) Draw the figure showing pressure distribution along the center line of 07 car and explain aerodynamic aids.
Q.3 (a) Define: 1. Braking Factor 2. Braking Torque 3. Braking Efficiency 03
(b) Construction of bias & radial tyre with the help of sketch. 04
(c) Describe total braking force of front axle & rear axle with the graph and 07 explain the necessity of brake proportioning:
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OR
Q.3 (a) Define: 1. Wheel lock up 2. Pedal force gain 3. Brake Proportionality 03
(b) Write a short note on aerodynamic drag. 04
(c) What is braking co-efficient? Explain the parameters which affect 07 braking co-efficient.
Q.4 (a) Explain under steer condition. 03
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(b) Discuss in detail various factors affecting on tyre life. 04
(c) Derive an expression for lateral slip in tire for a simple model. 07
OR
Q.4 (a) Differentiate Active, Semi active & Passive suspension system. 03
(b) Differentiate between davis steering system and ackerman steering system. 04
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(c) Define ride and explain ride dynamic system. 07
Q.5 (a) Draw and explain anti-dive suspension geometry. 03
(b) Explain steering geometry error. Explain the effect of geometry error 04 on dynamics of vehicle.
(c) Give the detail of tire notation: 195/620 R16. Explain effect of high tire 07 pressure, low tire pressure & tread rating on performance of vehicle.
OR
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Q.5 (a) What is the important of rollover? List types of roll over of the vehicle. 03
(b) Explain importance of trail in motorcycle. 04
(c) Draw quarter car model of vehicle representing passive suspension system. 07 Obtain the mathematical model for the same in steady state vibration for sprung and unsprung mass.
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