CLARKSON ES 305 - The Eng. Design Process (18 pages)

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The Eng. Design Process



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The Eng. Design Process

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Pages:
18
School:
Clarkson University
Course:
Es 305 - Virtual Tools in Engineering Design
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ES305 Virtual Tools in Engineering Design The Eng Design Process James Carroll Associate Professor Electrical and Computer Engineering Total Design Total Design is a systematic process from Identification of market user need to selling of a product that meets the need The process is also referred to as the Product Delivery Process or Product Development Process PDP The process is centered on the Design Core a set of activities central to all PDP The Design Core Consists of a market user need the starting point product design specification PDS conceptual design detailed design manufacturing sales the ending point The Design Core An iterative process with information flowing in all directions Inputs include techniques for analysis synthesis decision making modeling etc some are discipline or technology dependent e g strength of materials some are not The Design Core Current trends in current design practices Life cycle design concept to final disposal Design for manufacture and assembly Design for quality Faster design cycles concurrent engineering Engineering without walls e g virtual corporations Design for export using global standards e g the EU RoHS Directive calls for the restriction of the use of certain hazardous substances in electrical and electronic equipment Product Design Specification A statement of need that overviews the product to be designed often called a brief places boundaries on the subsequent design activities which are carried out within the envelope of the PDS Product Design Specification Elements of a PDS often address desired performance service life operating environment maintenance target cost competition size weight shipping manufacturing quantity materials aesthetics appearance finish ergonomics quality and reliability shelf life storage testing safety market legal social and political constraints installation documentation disposal etc Product Design Specification Conceptual Design Synthesis Involves the generation of solutions to meet the stated needs of the PDS or partial PDS and the evaluation of these solutions to select the optimum candidate Can be applied at the complete system subsystem or component level of the design process Three primary components referred to as controlled convergence Concept generation individuals Development of evaluation criteria groups Evaluation selection of concepts groups Conceptual Design Synthesis Common techniques used to generate ideas in the context of controlled convergence analogy brainstorming sketch storming attribute listing checklists inversion combination Conceptual Design Synthesis Most techniques used to evaluate concepts involve 1 2 3 4 5 Selecting criteria Assigning weighting factors Developing a rating scale Constructing a decision making structure Determining the best design alternative Common evaluation techniques include weighted objectives trees and evaluation matrices morphological charts and black boxes Conceptual Design Synthesis The outcome of this phase of the design process should be a complete concept engineered to an acceptable level to establish its validity e g set of part layouts or schematic drawings using CAD CAE tools a focus of this course e g hand or CAE based calculations that estimate the system performance etc Detailed Technical Design In this stage of the process the individual subsystems and components are designed in detail this level of design relies heavily on the technical engineering disciplines It is often helpful to come up with individual component design specifications CDS similar to a PDS w r t elements addressed includes issues such as component interfacing and a component s effect of the whole part etc Detailed Technical Design General pointers never carry out detailed design without reference to a specific concept or vice versa interactions between different subsystems must be considered within the overall constraints of those subsystems keep in mind that the very act of defining a component places constraints on the overall system keep in mind load lines cost size simplicity standardization of parts ways of manufacturing etc Manufacturing The design of a product together with its manufacturing process is called concurrent engineering The aims of design for manufacture DFM minimize component and assembly cost minimize development cycle time produce higher quality products Ideally the detailed design of the product is performed simultaneously with the manufacturing process Sales Marketing Two primary aspects Establishing the nature and characteristics of the product to be made by means of market research Marketing the final product e g distribution service etc Example questions for potential customers desired product performance desired product cost time scale when do you want a product with this performance Will less faster be better Related Topics Design management e g design reviews The computer internet as a tool to drive total design e g CAD CAE and visualization tools web based tools etc Quality Function Deployment QFD developed to better assess customer needs and drive the total design process Functional cost analysis Failure mode and effect analysis Fault tree analysis References S Pugh Total Design Addison Wesley 1991


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