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Department of Mechanical Engineering AMU Aligarh MEC3120/EMEC3120

The document outlines a series of engineering problems related to the design and analysis of flywheels and turning moment diagrams in mechanical engineering. It includes calculations for punching operations, crankshaft torque, and the dynamics of a nine-cylinder engine coupled to a generator. The problems require determining parameters such as flywheel mass, horsepower, and system inertia to ensure optimal performance and stability.

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deepikavarshney904
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48 views1 page

Department of Mechanical Engineering AMU Aligarh MEC3120/EMEC3120

The document outlines a series of engineering problems related to the design and analysis of flywheels and turning moment diagrams in mechanical engineering. It includes calculations for punching operations, crankshaft torque, and the dynamics of a nine-cylinder engine coupled to a generator. The problems require determining parameters such as flywheel mass, horsepower, and system inertia to ensure optimal performance and stability.

Uploaded by

deepikavarshney904
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Department of mechanical Engineering

AMU Aligarh
MEC3120/EMEC3120
Turning moment diagram and flywheels
Q1. 20 holes of 1 cm diameter are to be punched every minutes in a 1.5 cm steel plate whose resistance to
shear is 353.16 MPa. The actual punching takes place one fifth of the interval between two successive
operations. The speed of the flywheel is 300 rpm. Design a suitable CI rimmed flywheel with the
coefficient of fluctuation of speed of 0.01 and the maximum velocity of the rim equal to 60 m/s.
Q2. The crankshaft torque of an engine can be expressed as
( ) Nm
It the speed of the engine is not to exceed 0.5% above and below the mean speed of 250 rpm, determine
the suitable mass of the flywheel.
Q3. The equation of the turning moment diagram is of an IC engine running at 300 rpm is given by
( ) Nm
A flywheel coupled to the crankshaft has a mass moment of inertial 450 kgm2 about its axis of rotation.
Determine
(a) The horse power of the engine,
(b) The total fluctuation of speed and
(c) Maximum angle by which the flywheel leads to lags an imaginary flywheel at a constant speed.

Q4. A nine cylinder four stroke engine coupled to a generator has the following data
Stroke 0.3 m
n 4
Crank pin mass 25 kg
Journal radius 0.075 m
Journal mass 30 kg
Crank mass 90 kg
Connecting rod mass 60 kg
CG of the connecting rod from big end 0.2 m
Mass of piston rings and pin 45 kg
Counter balancing mass per cylinder 90 kg
CG of counter balancing mass from main bearing 0.15 m
Speed 1000 rpm
HP/cylinder 250 kW
Mass moment of inertia of generator 540 kg-m2
Damper inertia 20 kgm2

Torque fluctuates 9 times in 2 revolutions between +35 kNm and + 8 kNm. The area above and below the
mean line can be approximated by simple triangles. Determine total system inertia. Determine the
flywheel mass moment of inertia, if the speed fluctuations are to be kept are to be kept within 0.5 rpm

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