Lecture 5 Product Design Specification PDS in Design

Lecture 5 Product Design Specification

PDS in Design Process Recognition of Need Becoming Informed § Market analysis § Background study Problem Definition Product Design Specifications 2

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. 3

Elements of PDS 4

PDS ¤ Performance – target, attainable values ¤ Environment – effects on product during manufacture use, effects on environment ¤ Life in service – 7 days/week, 24 hrs/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 5

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 6

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. 7

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 8

Format of PDS 9

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 10