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| MECHANICAL DESIGN
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Second Edition
By
Peter Childs, BSc.(Hons), D.Phil, C.Eng, F.I.Mech.E., Professorial Lead in Engineering Design, Department of Mechanical Engineering, Imperial College London, UK
Description
This book introduces the subject of total design, and introduces the design and selection of various common mechanical engineering components
and machine elements. These provide "building blocks", with which the engineer can practice his or her art.
The approach adopted for
defining design follows that developed by the SEED (Sharing Experience in Engineering Design) programme where design is viewed as "the
total activity necessary to provide a product or process to meet a market need." Within this framework the book concentrates on developing
detailed mechanical design skills in the areas of bearings, shafts, gears, seals, belt and chain drives, clutches and brakes, springs
and fasteners. Where standard components are available from manufacturers, the steps necessary for their specification and selection
are developed.
The framework used within the text has been to provide descriptive and illustrative information to introduce principles
and individual components and to expose the reader to the detailed methods and calculations necessary to specify and design or select
a component. To provide the reader with sufficient information to develop the necessary skills to repeat calculations and selection processes,
detailed examples and worked solutions are supplied throughout the text.
This book is principally a Year/Level 1 and 2 undergraduate
text. Pre-requisite skills include some year one undergraduate mathematics, fluid mechanics and heat transfer, principles of materials,
statics and dynamics. However, as the subjects are introduced in a descriptive and illustrative format and as full worked solutions are
provided, it is possible for readers without this formal level of education to benefit from this book. The text is specifically aimed
at automotive and mechanical engineering degree programmes and would be of value for modules in design, mechanical engineering design,
design and manufacture, design studies, automotive power-train and transmission and tribology, as well as modules and project work incorporating
a design element requiring knowledge about any of the content described.
The aims and objectives described are achieved by a short introductory
chapters on total design, mechanical engineering and machine elements followed by ten chapters on machine elements covering: bearings,
shafts, gears, seals, chain and belt drives, clutches and brakes, springs, fasteners and miscellaneous mechanisms. Chapters 14 and 15
introduce casings and enclosures and sensors and actuators, key features of most forms of mechanical technology. The subject of tolerancing
from a component to a process level is introduced in Chapter 16. The last chapter serves to present an integrated design using the detailed
design aspects covered within the book. The design methods where appropriate are developed to national and international standards (e.g.
ANSI, ASME, AGMA, BSI, DIN, ISO).
The first edition of this text introduced a variety of machine elements as building blocks with which
design of mechanical devices can be undertaken. The approach adopted of introducing and explaining the aspects of technology by means
of text, photographs, diagrams and step-by-step procedures has been maintained. A number of important machine elements have been included
in the new edition, fasteners, springs, sensors and actuators. They are included here. Chapters on total design, the scope of mechanical
engineering and machine elements have been completely revised and updated. New chapters are included on casings and enclosures and miscellaneous
mechanisms and the final chapter has been rewritten to provide an integrated approach. Multiple worked examples and completed solutions
are included.
Audience
Undergraduate students in Mechanical Engineering; Manufacturing Engineering; Industrial design; Automotive Engineering.
Contents
Part 1: Total Design
Introduction
The design process
Case study
Total design
Product design specification
Conceptual design
Boundary shifting
Brainstorming
Morphological analysis
Function trees
The technology base
Conclusions
References
Worksheet
Part 2: Mechanical Engineering
Introduction
Thermodynamics
Fluid mechanics
Heat transfer
Power plants
Mechanics
Statics
Dynamics
Materials
Metals
Plastics
Composites
Ceramics
Electrical Machines
References
Part 3: Machine Elements
Introduction
Tribology
Bearings
Gears, belts and chains
Clutches and
brakes
Sealing
References
Part 4: Bearings
An Introduction to bearings
Sliding bearings
Lubricants
Design of boundary lubricated bearings
Design of full film hydrodynamic bearings
Rolling contact bearings
Bearing life and selection
Bering installation
References
Worksheet
Part 5: Shafts
Introduction
Shaft-hub connection
Shaft-shaft connection - couplings
Flywheels
Discs
Disc stresses
Cams
Critical speeds
and shaft deflection
ASME design code for transmission shafting
References Worksheet
Part 6: Gears and gearboxes
Introduction to gears
Construction of gear tooth profiles
Gear trains
Epicyclic gearboxes
Tooth systems
Force analysis
Gear stresses
Bending stresses
Simple
gear selection procedure
References Worksheet
7. ISO and AGMA gear stressing
Introduction AGMA bending and contact stress equations
for spur gears
AGMA spur gear factors
AGMA bending and contact stress equations for helical gears
AGMA helical gear factors
AGMA bending
and contact stress equations for straight bevel gears
AGMA bevel gear factors
AGMA equation for worm gears
References Worksheet
Part
8: Belts and Chains
Introduction
Belt drives
Belt selection
Chain drives
Roller chain selection
References
Worksheet
9 Seals
Introduction
Static seals
Elastomeric seal rings
Gaskets
Dynamics seals
Seals for rotating machinery
Seals for reciprocating components
References
Worksheet
10 Clutches and brakes
Introduction
Clutches
Design of disc clutches
Cone clutches
Self-locking clutches
Brakes
Disc brakes
Cone brakes
Drum brakes
Band brakes
References
Worksheet
11 Springs and dampers
Introduction
Helical compression springs
Helical extension
springs
Helical torsion springs
Leaf springs
Belleville washers
Dampers
References
Worksheet
12 Miscellaneous Mechanisms
Introduction
Levers
Linkages
Valves
Pneumatics and hydraulics
References
13 Fastening and powerscrews
Introduction to permanent and non-permanent
joints
Threaded fasteners
Standard threads
Stresses in threads
Power screws
Forces and torque
Power and efficiency
Self locking screws
Rivets
Adhesives
Welding
References
Worksheet
14 Casings and enclosures
Introduction
Machine frames and structures
References
15 Sensors
and actuators
Introduction
Sensors
Position
Temperature
Pressure
Fluid flow
Speed
Force
Torque
Actuators
Automotive applications
Control
References
16 Tolerance engineering
Introduction
Component tolerances
Standard fits for holes and shafts
Interference fits
Machine
capability
Geometric tolerancing
Statistical tolerancing
Sure-fit or extreme variability
Linear functions or tolerance chains
Several
independent, uncorrelated random variables
Modern statistical design techniques and quality assurance
References
Worksheet
17 Integrated
design
Introduction
Management of design
Evaluation
Project management
Power transmission case study
References
Appendix Worksheet Solutions
Index
| Bibliographic details |
Paperback, 384 pages, publication date: DEC-2003
ISBN-13: 978-0-7506-5771-6
ISBN-10: 0-7506-5771-5
Imprint: BUTTERWORTH HEINEMANN
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USD 53.95
GBP 35
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Last update: 3 Oct 2009
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