SOLUTION: MIME 4222 Army Transportation & Aviation Logistics Design Engineering Report

Instructions to the students for the course MIME4222 ENGINEERING DESIGN II

Read the questions and given data carefully, the problem has to be solved according to the given
data. For data book refer to E-learning.

Any condition or data is given in the question you have to use only the given data or condition.

Any required data is not mentioned can be assumed.

Write given data to all the questions.

Complete first page and Student Declaration Form and send it through mail.
Section A: Answer All Questions (5 × 10 = 50 marks)
Q1a) A Simple band brake operates on a drum diameter 1 m makes an angle contact of 170 o while
the band passing over it. The two ends of the bands are attached such a way that one end is
fastened to a fixed pin at fulcrum and the other end connected to the brake arm 160 mm from
fulcrum. The brake is to absorb a power of 120 kW at 800 rpm, the coefficient of friction
between
the blocks and the drum is 0.25. Draw simple band brake diagram to represent the
given data
and Calculate the force required at the end of the lever 1.2 m long from fulcrum,
when the
drum rotates in the anticlockwise direction and also Calculate width and thickness of
if width is thrice the thickness required for this brake band if the maximum tensile
to exceed 60 MPa?
steel band
stress is not
(05 marks)
(Calculations of torque and tensions – 3 marks, calculation of force, thickness and width – 2 marks)
Q1b) Design a single plate clutch outer and inner diameter and axial thrust load, also calculate
diameter of spring and stiffness of spring, with both sides effective, of a vehicle to transmit
kW at a speed of 2700 r.p.m. The pressure intensity is not to exceed 0.08 N/mm2. Take
of friction for the surfaces as 0.35 and the outside diameter of the surfaces is to be
32
coefficient
3 times the
inside diameter. The axial thrust is to be provided by 5 springs of about 25 mm
mean coil mean
diameter. For spring material, the safe shear stress is to be limited to 320 MPa
and the modulus
of rigidity may be taken as 1 kN/mm2. (Assuming uniform wear theory and
take shear stress factor as 1.234).
(05 marks)
Page – 0 – of
(Calculations of torque, outer diameter, inner diameter and axial load – 3.5 marks, calculation of spring diameter and
stiffness – 1.5 marks)
Q2a) A shunt DC motor has a rated armature current of 180 A and a rated field current of 6 A.
When its rotor is blocked, an armature voltage of 12.2 V produces a field voltage of 350 V
produces a field current flow of 5 A. The brush voltage drop is assumed to be 4 V. At no
that
load,
the terminal voltage equals to 280 V, then the armature current is equal to 14 A, the field
current is 6 A, and the motor speed is 1250 rev/min. Estimate the output power from this
motor at rated conditions and the motor efficiency.
(05 Marks)
(Calculations of copper losses – 2 marks, rotational and stray losses – 1 mark, Efficiency – 2 marks)
Q2b) Select the type of motor used in lathe and cranes. Justify your selection with any four valid
reasons.
(2.5×2=5
(Selection of type of motor –1/2 mark, 4 x 1/2 =2 mark )
Page – 1 – of 5
Marks)
Q3) A double shoe brake as shown in figure below is capable of absorbing a torque of 1450 N-m. The
diameter of the brake drum is 800 mm and the contact angle of contact for each shoe is 200 o.
If
the coefficient of friction between the brake drum and lining is 0.4. Calculate (i) The spring
force
necessary to set the brake (ii) The width of the brake shoe, if the bearing pressure on the
lining
material is not to exceed 0.3 N/mm2 (iii) Force required to be exerted by the bell crank
release the brake (iv) If the permissible stress of the spring material is 500 MPa,
dimensions of the coil assuming spring index to be 6. The maximum spring
lever to
(v) determine the
force is to be 2 times
the spring force required during braking by neglecting curvature effect.
(10 Marks)
(Calculations of spring force – 4 marks, width of the brake shoe – 2 marks, required force – 2 marks, calculation spring load,
wire diameter, mean diameter – 2 marks)
Page – 2 – of 5
Q4) Apply parametric design concept to develop a ‘spur gear’ and explain each step as follows.
(i) Define spur gear and select the design variables
(2 Marks)
(ii) Analyze and select the important design variables
(2Marks)
(iii) Optimize the design objectives
(1 Mark)
(iv) Draw the parametric flow chart for the attained parametric design values
(3 Mark)
(v) Relate Empathy and human values.
(2 Marks)
(10 Marks)
Q5) Select a suitable wire rope from 6 x 37 group to lift a maximum load of 12 kN through a height
of 60 m. Maximum lifting speed is 2 m/s which is attained in 3 seconds. Sheave diameter is
30 times the rope diameter. Factor of safety is 6. Take tensile strength 1700 N/mm2 and
Modulus of elasticity as 84 kN/mm2.
(10 marks)
(Calculations of bending stress and equivalent bending load – 4 marks, actual FOS load due to acceleration – 2 marks
actual FOS load during staring – 2 marks actual FOS load due to normal working – 2 marks )
Page – 3 – of 5
Good luck ☺
Page – 4 – of 5

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