ABET Definition of Design

Transcription

1 ABET Definition of Design Engineering design is the process of devising a system, component, or process to meet desired needs. It is a decision-making process (often iterative), in which the basic sciences, mathematics, and engineering sciences are applied to convert resources optimally to meet a stated objective

2 ABET Definition of Design Among the fundamental elements of the design process are the establishment of objectives and criteria, synthesis, analysis, construction, testing, and evaluation. Design is Invention & Disposition of the form, parts, or details of something according to a plan.

3 ABET Curriculum Requirements The engineering design component of a curriculum must include at least some of the following features: development of student creativity use of open-ended problems development and use of design methodology

4 ABET Curriculum Requirements Formulation of design problem statements Development of specifications Consideration of alternative solutions Feasibility considerations Detailed system descriptions

5 ABET Curriculum Requirements It is essential to include a variety of realistic constraints such as economic factors, safety, reliability, aesthetics, ethics, and social impact.

6 Five Phases of Design 1. Needs assessment. 2. Problem formulation. 3. Abstraction and synthesis. 4. Analysis. 5. Implementation.

7 Often designers have to repeat the same steps many times, which is why designing is described as highly iterative in nature.

8 Basic Steps in Design Process Model 1. Recognizing the need 2. Defining the problem 3. Gathering information 4. Planning the project 5. Conceptualizing alternative approaches 6. Evaluating the alternatives 7. Selecting the preferred alternative 8. Communicating the design 9. Implementing the preferred design

9 It is important to recognize that any model is a simplified description of a more complicated reality. Not every step will be used to the same extend in every design, and some steps may be performed out of order.

10 Design Process The design process continues as long as the need continues, and it ends only when the cost of continuing process exceeds the value of an improved design. ( Creeping Elegance ).

11 The Need for a New or Redesigned Product May Have Resulted From: Concern for the Health, Safety, and Quality of Life of the Public. Recognition That an Existing Product Must be Redesigned in Order to Eliminate Shortcomings in The original Design, manufacturing, or incorporate New technology. Engineers Observations leading to Conclusions that improvements can be made.

12 Nth-Generation Designs There is no such thing as a perfect solution to an engineering problem. The design process is repeated again and again as new and better solutions are developed. Example: The Wright brother s success in manned flight.

13 The basic types of problems 1. Prediction (calculating a result or predict a system s behavior by applying equations, physical laws, tools analysis, etc.) 2. Explanation: searching for the cause of failure.

14 Continued 3. Invention: developing a new and effective solution to a problem. 4. A combination : One make seek to prevent satellites from falling (a problem of invention), but he must first determine the cause for such flight failures (a problem of explanation).

15 Distinct types of Design Activity Original design - this involves elaborating on an original solution principle for a system which performs a task which may be new, or may have been solved previously by other means. Example: the Space Shuttle.

16 Continued Adaptive design - this involves adapting a known system to a changed task, the solution principle remaining the same. Example: the Keyboard for computers

17 Continued Variant design - this involves varying the size and/or arrangement of certain aspects of the chosen system, the function and solution principle remaining the same. Example: Container ship designs with parametric variations for the same standard-sized unit.

18 Needs assessment Focusing upon others: a key to success 1. Safety and Quality of life Example: A typewriter for the Blind 2. Improving an existing product or system Example: The DC Heart Defibrillator 3. Commercial incentives Example: The Kwik-Lock Closure 4. Personal experiences: Example: The Quick-Release Ski Binding