Download GTU B.Tech 2020 Winter 7th Sem 2170203 Vehicle Dynamics Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY

BE- SEMESTER-VII (NEW) EXAMINATION - WINTER 2020

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Subject Code: 2170203 Date: 19/01/2021

Subject Name: Vehicle Dynamics

Time: 10:30 AM TO 12:30 PM Total Marks: 56

Instructions:

1. Attempt any FOUR questions out of EIGHT questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

Q.1

1. What is Vehicle Axis System and Earth Fixed Axis System? (03)
2. Derive the equation to calculate the dynamic axle load when the vehicle on level ground under static condition. (04)

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3. Explain vehicle fixed co-ordinate system with neat sketch. (07)

Q.2

1. Write a short note on aerodynamic drag. (03)
2. Explain pressure distribution around the vehicle. (04)
3. Define brake factor in case of drum brake system. Draw forces acting on brake shoes and explain self servo effect. (07)

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Q.3

1. Give the name of major elements of tyre and their suitable materials. (03)
2. Discuss in details various factors affecting on tyre life. (04)
3. Explain Camber thrust. Write a short note on Cornering force produced by a vehicle tire. (07)

Q.4

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1. Construction of Bias & Radial tyre with the help of neat sketch. (03)
2. Define ride and explain ride dynamic system. (04)
3. Draw clear sketch of Tyre axis system and explain the details. (07)

Q.5

1. Explain Difference between dependent and independent suspension system. (03)

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2. Draw and explain anti dive suspension geometry (04)
3. Explain Active suspension and Roll centre analysis. (07)

Q.6

1. Explain Anti squat suspension geometry. (03)
2. Explain MacPherson Strut Suspension system. (04)

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3. Draw quarter car model of vehicle representing passive suspension system. Obtain the mathematical model for the same in steady state vibration for sprung and un sprung mass. (07)

Q.7

1. Differentiate between Davis steering and Ackerman steering mechanism. (03)
2. Define steering geometry error. Explain the effect of geometry error on dynamics of vehicle. (04)
3. Explain the following turning response properties: (07)
   • Under steer gradient.

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   • Neutral steer.
   • Under steer.
   • Over steer.
   • Characteristic speed and Critical speed

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Q.8

1. What is the importance of roll steer? How is it achieved? (03)
2. What is quasi static rollover of a suspended vehicle? Draw and explain roll reaction on vehicle. (04)
3. Explain Wheelbase, Fork offset, Trail & Wheel flop for motorcycle. (07)

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