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BALAJI INSTITUTE OF ENGINEERING & SCIENCE

Laknepally (V), Narsampet, Warangal -506331

MECHANICAL ENGINEERING

SUBJECT : Dynamic Of Machine MARKS:BRANCH: Mechanical Engineering DURATION:

Unit1

1 a) Define Gyroscope, principle and its effect?b)stability of a 4 wheeler driver vehicle moving on a curved path?

2.a) Define Gyroscope?b) stability of a 2- wheeler taking a turn?

c) the mass of 2- wheeler with its rider is 220kg. the center of gravity of the system is 0.8mabove the ground when the machine is in vertical position. The mass of each wheel is 9kg andthe radius is 0.3m. The engine rotates at 6 times the speed of road wheels and in the same sense.The mass moment of inertia of engine is 1.6kgm 2. The calculate the angle of wheel that isrequired so that the 2 wheelers wont skid at a speed of 75km/hr. When it describes a curve of 55m?

3.a) Define Gyroscope? And its applications? b) Effect of Gyroscope couple on a naval ship?i) Steeringii) Pitchingiii) Rollingc) The mass moment of inertia of an aeroplane air screw is 6.75kgm 2 .and rotates at 1300rpm.The aircraft makes a compete half circle turn in 10sec. calculate the gyroscope couple on theaircraft .and state its effect on the aircraft. The air screw rotates clockwise when viewed from therear?Unit2

1.a) define static force analysis and dynamic forces analysis ? b) derive an equation for velocity and acceleration of piston?2.a) explain free body diagram? With one example ?

b) derive an equation for angular velocity and angular acceleration of connecting rod?3. a) explain D’alembert’s principle?

b) the crank-pin circle radius of a horizontal engine is 300m. the mass of the reciprocating partsis 250kg. when the crank has travelled 60 o from I.D.C, the difference between the driving and

back pressures is 0.35N/mm2. The connecting rod length between centers is 1.2m and thecylinder bore is 0.5m. If the engine runs at 250rpm and if the effect of piston rod diameter isneglected.

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Calculate

1. Pressure on slide bars.2. Thrust in the connecting rod.3. Tangential force on the crank pin, and4. Turning moment on the crankshaft .

Unit3

1. A) explain about synthesis of mechanism and types of synthesis? b)derive an equation for chebychev’s spacing?2. a)explain about precision positions?

b) derive an equation for freudentein’s of three precession points of slider crank mechanism?3. a) derive an equation for freidentein’s of three precession positions of four bar mechanism?

b) Design a four bar mechanism to coordinate the input and output angles as followsInput angles=15 0,30 0 and 45 0

Output angles=30 0,40 0 and 55 0

Unit4

1.a)define clutch and types of clutches? b)explan about single plate clutch with neat and diagram derive an equation for i) for uniform pressure?ii)for uniform wear?2.a)define clutch? Explain about multiplate clutch with neat diagram?

b)a power of 60kw is transmitted by a multi plate clutch at 1500rpm. Axial intensityof pressure is not to exceed 0.15N/mm2. The co-efficient of friction for the frictionsurface is 0.15. The external radius of friction surface is 120mm. Also the externalradius is equal to1.25 times the internal radius. Find the number of plates needed totransmit the required power. Assume uniform wear?3.a) define clutch and types of clutches?

b) explain about cone clutch with neat sketch and derive the formula in case of i)uniform pressureii) uniform wear iii)driving torque based on mean radius.