QFD example in. Ing. Inga Chudjakova Ing. Jaromír Tobiška

Transcription

1 QFD example in interaction with HMI Ing. Inga Chudjakova Ing. Jaromír Tobiška

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3 QFD application Two main application areas of QFD methods Furthermore we divide products into QFD Products Processes Comparison of the concepts Evaluation of technical parameters on basis of customer requirements

4 Product development process Methods SOP Product Planning Project management Package, concepts Production, logistic concepts Design of product Preparation of production, tools, logistics Quality assurement, preventive actions, methods Method selection Thinking aloud QFD Method selection Thinking aloud Plan of methods Methods DFMAS selection D-FMEA select. Select. and prepar. of Statist. Tolerance analysis. DFMAS P-FMEA select. RPS concept D-FMEA Definition of preventive actions Last definition of product prev. actions P-FMEA Last gross tolerance analysis Statistical tolerance analysis Last definition of process prev. actions MFU SPC Supporting methods: Kepner-Tregoe methods, FTA, TRIZ, Design of Experiments Customer requirement implementation methods. Failure prevention methods. Cost saving methods Supporting methods. Can be applied if necessary, throughout the product development process

5 QFD procedure Customer requirements Voice of the customer and Consumer respectively P4 P8 Correlation of HOW values How To meet the requirements P1 WHAT do customers want VoC - E P2 P5 P6 Assigning value Of What To How Market P3 T e Comparison c h to competition n i q u e P7 Technical comparison to the competitors

6 QFD example in interaction with HMI Determination of the technical parameters of vehicle display unit by using QFD method Optimization of the display to ensure safe operation while driving. The driver is advised not to takes his eyes of the road for longer period of time than 0,8 sec. The main objective of HMI display testing is the minimization of time needed to operate them, and thus the time driver is not concentrating on driving. From the aquired results it is possible to determine whether or not the tested concept is suitable for use in a real car.

7 QFD Matrix Display properties QFD matrix allows transformation of customer requirements into technical expression Position close to the driver Small driver distraction 7,36 3 Color combination for better legibility Good legibility of displayed information 7,20 9 Correlation values (P5): 0 = no effect 1 = low effect 3 = average effect 9 = high effect

8 Application of QFD methods Technical clinic testing using driving simulator The most rated technical expresions from the QFD matrix were tested separately on the separate screen Each item Evaluation of priorities: Font size Font legibility Text understanding Contrast (Contrast x Font size) A) FONT SIZE a. Main title b. Item c. Additional text B) TEXT LEGIBILITY (brightness, colors...) C) LEGIBILITY DEPENDANCE ON BACKGROUND

9 The drivers at the driving simulator chose combination contrast 1 along with second biggest font size as the most suitable. The biggest font size was, as they said, too distracting. COMBINATION OF FONT SIZE AND CONTRAST Application of QFD methods 100% 95% 90% 85% 80% 75% 70% 65% 60% 55% 50% 45% 40% 35% 30% 25% 20% 15% 10% 5% 0% X mm X+0.2 mm X+0.4 mm X+0.8 mm X mm X+0.2 mm X+0.4 mm X+0.8 mm X mm X+0.2 mm X+0.4 mm X+0.8 mm X mm X+0.2 mm X+0.4 mm CONTRAST 1 CONTRAST 2 CONTRAST 3 CONTRAST 4 X+0.8 mm Sufficient Combinatio Disputed Combinatio Insufficient Combinatio