INTRODUCTION Flashcards
“a profession concerned primarily
with the application of a certain
body of knowledge, set of skills,
and point of view in the creation
of devices, structures, and
processes used to transform
resources to forms which satisfy
the needs of society”
ENGINEERING
- ‘design’ comes from the Latin
‘designare’, which means to designate or
mark out. (Childs, 2004) - “It is the process of applying the
various techniques and specific
principles for the purpose of defining a
device, a process or a system in
sufficient detail to permit its physical
realization.”
ENGINEERING DESIGN
is an assemblage of links, or rigid
bodies, that are connected by
joints.
KINEMATIC CHAIN
- system of elements arranged to
transmit motion in a
predetermined fashion (Norton, 2004) - a kinematic chain in which at
least one link has been
‘grounded’ or ‘attached’ to the
frame of reference (which itself
may be in motion). (Tsai, 2000)
MECHANISM
- combination of mechanisms and
other components that transforms,
transmits, or uses energy, load, or
motion for a specific purpose. - “assemblage of several components
for the purpose of transforming
external energy into useful work” (Tsai,
2000)
MACHINE
- It involves the conceptualization,
planning, and creation of equipment
and systems specifically tailored for
agricultural applications.
-This includes the development of
machines, tools, and technologies to
enhance efficiency, productivity, and
sustainability in farming practices.
Agricultural Machinery Design
When we design, we specify:
- Configuration / shape / arrangement
- Size / dimension
- Materials
- Manufacturing processes to be used
TALENTS AND BODIES OF KNOWLEDGE
NEEDED BY A DESIGNER
•Knowledge, ability, talent to generate
ideas and/or possibilities
•Knowledge of how to evaluate and sort
“good” from “bad” ideas
•Knowledge of the structure of design
and how to tailor the process to the task
at hand
THE DESIGN PROCESS (Shigley)
Identification of need
Definition of problem
Synthesis
Analysis and optimization
Evaluation
Presentation
- often constitute a highly creative act
-existence of a potential market for a
product, device or process
-re-engineering an existing machine
IDENTIFICATION OF NEED
- More specific than identification of the need
-ALL specifications for the object to be
designed must be included
DEFINITION OF PROBLEM
Enumeration of design considerations
DEFINITION OF PROBLEM
-“invention of the concept or concept design”
- concepts or ideas can be generated from
imagination or experiences
-Research is very useful in this stage
SYNTHESIS
-Performed to assess whether the idea is
satisfactory, and if it is satisfactory, how well
it performed?
-Concepts that unsurvived analysis are
revised, improved, or discarded.
-Construction of mathematical models to
simulate the real physical system
-Prototyping can be done to aid in analysis
and optimization
ANALYSIS AND OPTIMIZATION
-final proof of a successful design
- performed to confirm if the design really
satisfied the specifications
EVALUATION
-a selling job
- written, oral, graphical
*Design is a communication-intensive
activity
PRESENTATION
Characteristics of the Design Process
The design process is
Trans-disciplinary
Characteristics of the Design Process
The design problems are
Almost always, open-
ended
-They do not have a unique or
‘‘correct’’ solution
- Some solutions will clearly be better
than others
Almost always, open-
ended.
Design is an iterative process
or involves repetition.
TAE (TRIAL AND ERROR)
-required in every step of the design
process
-involves compromises among
competing choices
-largely influenced by design
considerations
Decision-Making Process
the product must perform to
fill its intended need and customer
expectations
Functional
the product is not hazardous to the
user, bystander, or surrounding properties
Safe
the product must perform its
intended function satisfactorily or without
failure at a given age
Reliable
