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Product Design Specification Lecture 5
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2 PDS in Design Process Recognition of Need Becoming Informed Problem Definition Market analysis Background study Product Design Specifications
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3 PDS Proposed by Pugh It is NOT the final specifications/achievements It is a control document of what designers try to achieve It acts like a design checklist and applicable to all design applications It is dynamic rather than static – can be improved, changed to suit design requirements It defines the constraints/boundary of the design.
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4 Elements of PDS
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5 PDS Performance – target, attainable values Environment – effects on product during manufacture use, effects on environment Life in service – 7 days/week, 24hrs/day, @ X years Maintenance – maintenance philosophy, need for special tools, ease of maintenance Targeted production cost Competition – data from benchmarking, IP, info search Shipping – delivery method, lifting capability Packing – cost & method of packing Quantity – will affect other costs such as tooling, processes Manufacturing facility – in-house or vendor, support system, machinery
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6 PDS (cont’d) Size – affects user, cost, shipping & handling Weight - affects user, cost, shipping & handling Aesthetics – user perception or acceptence Materials Product Life Span – life in production line Standard and Regulations – government, BS/ISO/MS/DIN Ergonomics Customer – target customer Quality & Reliability – subjected to standards (BS, ISO, etc) Shelf Life – storage risks and problems Processes – processes involved, in-house facility/vendor Time-scales – period to complete the design
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7 PDS (cont’d) Time-scales – time needed to complete the development Testing – methods, facility, requirements/standards Safety – safety requirements Company Constraints – house, facility, cost Market Constraints – local conditions, full market knowledge Patents, literature & Product data – clash & IP laws Political & Social Implications – social unrest, rejection Legal – product liability legislation (product defects, defects of manufacture, defects of design, etc) Installation – assembly consideration (stand alone, subsystem) Documentation – manual, user instructions, etc Disposal – environment.
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8 Writing PDS Document It is a control document Should be clearly written Use sharp and definitive statements, NOT is essay form Try to quantify parameters or estimate a figure Vary your starting point Date and put your issue number Clearly document amendments
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9 Format of PDS
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10 Assignment 2 Carry out your information analysis of the car jack design based on your information analysis plan. Develop your PDS based on your information analysis. Due 3 rd July 2003
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