JNTU
JNTU B.Tech III VEHICLE DYNAMICS Previous Question Paper (May - 2018 - R13)
Note: This question paper contains two parts A and B. Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks and may have a, b, c as sub questions.
Part A
Explain the stiffness and rigidity.
Answer
Stiffness is the measure of a material's resistance to elastic deformation under an applied load, defined as the ratio of force to displacement. Rigidity refers to the structural ability of a component to resist bending or twisting (torsion) under external forces, often related to the material's shear modulus and geometry.
What are the various forces come on to tyres?
Answer
The primary forces acting on a tyre include:
- Vertical load (Normal force): Supports the vehicle weight.
- Longitudinal force: Traction or braking forces acting in the direction of travel.
- Lateral force (Cornering force): Acts perpendicular to the wheel plane during steering or side-wind conditions.
How longitudinal forces are developed on tyres?
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What are the effects, if a car is parked on uneven ground?
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Sketch the geometry of turning a vehicle.
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What are the forces developed on tyre during cornering?
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What is the importance of roll angle?
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What is the effect of damping ratio on roll over?
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What is natural frequency and damping frequency?
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What are the various elements present in the vibrating system?
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Part B
What are the various factors to be considered in the selection of wheels for heavy vehicles?
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Sketch and explain the construction of disc wheels used on vehicles.
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How the forces coming on to the tyre will be varying with dry road, wet road and ice?
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What is the effect of camber thrust and tread design on the performance of vehicle?
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If lubricant is not present in the gear box, explain its effect on the working of gears?
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What are the various forces to be considered in the design of braking system and explain about rolling resistance and its effect on brakes?
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How the gear box design can be taken up for smooth running and without loss of torque?
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Describe the accelerating forces on level, inclined and uneven ground and also explain their effects on the vehicle efficiency.
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How the forces developed on the vehicle getting changed with the geometry front wheel and gear wheel?
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What is aligning torque, overturning moment and rolling resistance and explain their importance on the vehicle.
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Differentiate between translational and rotational rigid body dynamics and explain their effects on the vehicle.
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What factors control slip angle during the corning of vehicle and explain the forces developed?
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What is rollover index of vehicle and how can it be estimated?
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What are the forces and moments responsible for rolling of vehicle and explain methods to avoid them?
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What are the reasons for pitching and yawing of vehicle and mention the procedures to avoid them?
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What is rolling resistance and over turning of vehicle?
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What are the effects of natural frequency, damped frequency and fundamental frequency on the vehicle performance?
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What are the various types of vibrations developed on the vehicle and explain about simple harmonic vibrations, periodic vibrations and random vibrations?
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How the Holzer’s method is used to evaluate the frequencies developed on the vehicle?
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Sketch the Bicycle car and body pitch modes.
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