engineering lecture notes btech helpful

1. An Introduction
to Mechanical
Engineering

2. Introduction to
Mechanical
Engineering
• What is engineering?
• What do mechanical engineers do?
• The basic engineering process

3. What is an Engineer?
• Engineering is the profession in which
knowledge of the mathematical and
natural sciences gained by study,
experience, and practice is applied with
judgement to develop ways to utilize,
economically, the materials and forces of
nature for the benefit of mankind.
[ABET]

4. What Engineers Do ?
• Build a Bridge?
• Make a Robot?
• Work on a Computer?
• Drive a Train?
• Repair Car Engines?

5. Engineering Job
Descriptions
• Analytical engineer
• Design engineer
• Test engineer
• Manufacturing engineer
• Development engineer
• Research engineer
• Sales engineer
• Engineering manager
• Consulting engineer

6. Why Be An
Engineer?
•Money
??
•Fame ??
•Fortune
??

7. Why might YOU want to be an Engineer?
• You have high goals in life and want to get a strong
college education!
• You like math and sciences, and would like to apply
them to real world problems!
• You enjoy hands-on work and tinkering with
things!
• You were told that engineers make a lot of money!
• You were told that you can get a good job with an
engineering degree!
• You want to help humanity!

8.  Classical definition: An engineering discipline that encompasses the
generation and application of heat and mechanical power and the design,
production, and use of machines.
 A machine is an apparatus using or applying mechanical power and
having several parts, each with a definite function and together
performing a particular task.
 Pumps, compressors, internal combustion engines, wind turbines
 Piping systems and pressure vessels, reactors, heat exchangers
 Consumer goods and products: everything from coffee grinders to
toothbrushes
 Material handling equipment - conveyers, robots, production assembly
lines
 Vehicles - cars, trucks, heavy equipment, buses, aircraft, ships.
What is Mechanical Engineering ?
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9. What is Mechanical Engineering?
• Mechanical engineering is the second largest
and one of the oldest disciplines; broadest of
all engineering disciplines.
• Mechanical engineers apply the principles
of mechanics and energy to the design of
machines and devices:
ENERGY and MOTION

10. What will you study as an ME
student?
• Forces, motion, structures: statics, dynamics, kinematics,
mechanics of solids and fluids.
• Energy: thermodynamics, heat transfer
• Materials: materials engineering & processing, manufacturing.
• Machines: graphics, design, machine elements, controls.
• Economics: engineering economic analysis, cost engineering.
• Human and Social Studies: arts, humanities, social
sciences, history, government, ethics, law.
• Overall foundation: math, physics, chemistry, biology, analysis
skills, communication skills, computation skills.

11.  We have discussed classical mechanical
engineering applications but will now look
at some new topics
 In engineering, boundaries between
mechanical, electrical, and software
engineers are increasingly blurry
 As a new mechanical engineer you will
need some knowledge in other fields
 Mechanical engineering now has
undergraduate courses called Electro-
Mechanical Systems or Mechatronics
 As modern engineering becomes more
precise both with measurements and
computer simulations, understanding the
error associated with solutions has become
a focus
 An undergraduate course of study
should include Probability and
Statistics
The Modern Era and Mechanical Engineering
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12. Mech. Eng. Top 10: ASME Survey
Automobile: High-power lightweight engines, efficient mass-
manufacturing
Apollo: Saturn V launch vehicle (7.5 million pound thrust),
command and service module, lunar excursion module
Power generation: Conversion of stored energy into electricity,
manipulation of chemical-, kinetic, potential-, and nuclear-
energy, large-scale power production
Agriculture mechanization: Powered tractors, mechanized
harvesting, high-capacity irrigation pumps, computerized crops
management
Airplane: Propulsion (jet engines), lightweight materials,
electromechanical control systems

13. Mech. Eng. Top 10: ASME Survey
Integrated circuit mass production: IC
manufacturing machines, alignment systems,
temperature- and vibration control, motors, bearings
Air-conditioning and refrigeration: Compressors,
refrigerants, heat exchangers
Computer-aided engineering technology: Computer-
aided design, analysis, manufacturing, virtual collaboratives
Bioengineering: Imaging, prosthetics, minimally
invasive surgery, tissue engineering
Codes and standards: Interchangeability,
interoperability, interconnectivity

14. The Engineering Design
Process:
(Core of Engineering)
• Problem Identification: Get with Customer.
• Conceptual Design: Ideas, Sketches and Solution Lists.
• Refinement: Computer Modeling, Data Base
Development.
• Testing: Analysis and Simulation of All Design Aspects.
• Prototyping: Visualizing and Improving the Design.
• Communication: Engineering Drawings, Specifications.
• Production: Final Design, Manufacturing, Distribution.

15. Concurrent Engineering

16. Design Graphics
Sketching 3-D Modeling Analysis
Prototyping 2-D Drawing Team
Work

17. Machine Components: Basic Elements
Inclined plane wedge
Slider-Crank
Cam and Follower
Gear, rack, pinion, etc.
Chain and sprocket
Lever
Linkage Wheel/Axle Springs

18.  Product Design:
 Designing products ranging from knee
replacements to internal combustion engines to self
driving cars, aircraft, bicycles, robots, drones and
appliances
 Research and Development:
 Researching new ideas and solutions that satisfy society’s
demands or improving or expanding older ideas and
solutions
 Manufacturing:
 Designing and building the machines and processes
used for mass production of consumer products
 Systems Management:
 Managing the operations of a large system, such as a
manufacturing facility or a power plant
 Energy
 Planning how energy is created, stored and moved in
industries that produce and deliver electrical power,
such as natural gas, oil and alternative energy
Typical Jobs of A Mechanical Engineer
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