上游充通大学 SHANGHAI JIAO TONG UNIVERSITY Step 1:Prepare the list of metrics Ideal case: >There is one and only one metric for each need m L Metric Imp Units 13 Attenuation from dropout to handlebar at 10hz dB 2.6 Spring pre-load N 国 1.3Maximum value from the Monster Some times,difficult need g 4 1,3 Minimum descent time on test track 5 4 Damping coefficient adjustment range 3 N-s/m may require several metrics to 5Maximum travel (26in wheel) mm 5Rake offset mm 6Lateral stiffness at the tip kN/m translate 9 7Total mass kg 10 8Lateral stiffness at brake pivots 2 kN/m 11 9Headset sizes n >In the fork case,metrics 12 9Steertube length mm 13 9Wheel sizes 5 list 14 9Maximum tire width n for Need1(Reduces 15 10 Time to assemble to frame 16 11 Fender compatibility list Vibration to hands) 17 12 Instills pride subj 18 13Unit manufacturing cost 5 USS 19 14 Time in spray chamber w/o water entry s ·Metric1 20 15 Cycles in mud chamber w/o contamination K-cycles 2116,17Time to disassemble/assemble for maintenance Metric 3 2217,18Special tools required for maintenance 23 19 UV test duration to degrade rubber parts hours Metric 4 2 19 Monster cycles to failure cycles 25 20 Japan Industrial Standards test binary 26 20Bending strength (frontal loading) 5 MN
Step 1: Prepare the list of metrics Ideal case: There is one and only one metric for each need Some times, difficult need may require several metrics to translate In the fork case, metrics for Need1(Reduces Vibration to hands) • Metric 1 • Metric 3 • Metric 4
上游充通大学 SHANGHAI JIAO TONG UNIVERSITY Link Metrics to Needs 3 4 5 6 91011121314151617181920212223242526 po-d buuds ebue wsnpe budw (jaym ug)lee wnwxe esjo sjoNd ayeq le sseujgs ee sezis lespeeH buel eqnuees sezis jeay/ soo buunpenuwun sued gqn apeibap t uonenp isaAn isal spepues eusnpul ueder (bupebus buipueg Need reduces vibration to the hands allows easy traversal of slow,difficult terrain enables high speed descents on bumpy trails. allows sensitivity adjustment 5 preserves the steering characteristics of the bike 6 remains rigid during hard cornering is lightweight. provides stiff mounting points for the brakes fits a wide varlety of bikes,wheels,and tires 10 s asy to install 11 works with fenders. 12 nstills pride 13 is affordable for an amateur enthusiast. 14 is not contaminated by water 15 is not contaminated by grunge. 16 can be easily accessed for maintenance 17 allows easy replacement of worn parts 18 can be maintained with readily available tools 19 lasts a long time 20 is safe in a crash A simple needs-metrics matrix(map)represents the relationship between needs and metrics This matrix is a key element of the House of Quality
Link Metrics to Needs A simple needs-metrics matrix (map) represents the relationship between needs and metrics This matrix is a key element of the House of Quality
上降元&大Quality Function Deplpyment SHANGHAI JIAO TONG UNIVERSITY (House of Quality) technical correlations relative engineering importance metrics customer benchmarking needs on needs relationships between customer needs and engineering metrics target and final specs
Quality Function Deployment (House of Quality) technical correlations benchmarking on needs customer needs engineering metrics target and final specs relative importance relationships between customer needs and engineering metrics
上游充通大粤 e SHANGHAI JIAO TONG UNIVERSITY A few guidelines for the constructing the list of metrics Metrics should be complete ·One for one is better Difficult needs may require several metrics >Metrics should be dependent,not independent,variables. What-not-how principle(Chapter 4) Metrics specify the overall performance which should be dependent variables Dependent variable: 》Mass Independent variable 》Material
A few guidelines for the constructing the list of metrics Metrics should be complete • One for one is better • Difficult needs may require several metrics Metrics should be dependent, not independent, variables. • What-not-how principle (Chapter 4) • Metrics specify the overall performance which should be dependent variables – Dependent variable: » Mass – Independent variable » Material
7 上游充通大粤 SHANGHAI JIAO TONG UNIVERSITY Metrics should be practical. ·Measurable ·Observable ·Analyzable Some needs cannot easily be translated into quantifiable metrics Need 12(the suspension instills pride) Critical to success in the fashion-conscious mountain bike market Repeat the need statement as a specification 》 Note that the metric is subjective(will be evaluate by a panel of customers) Metrics should include the popular criteria for comparison in marketplace The trade media(Bicycling and Mountain Bike magazines,Internet sites) Mountain Bike magazine uses a test machine called Monster Measures the vertical acceleration(in g's)of the handlebars when a bicycle runs over a block 50 mm tall For this reason,the team included "maximum value from the Monster"as a metric
Metrics should be practical. • Measurable • Observable • Analyzable Some needs cannot easily be translated into quantifiable metrics • Need 12 ( the suspension instills pride) – Critical to success in the fashion-conscious mountain bike market – Repeat the need statement as a specification » Note that the metric is subjective (will be evaluate by a panel of customers) Metrics should include the popular criteria for comparison in marketplace • The trade media (Bicycling and Mountain Bike magazines, Internet sites) • Mountain Bike magazine uses a test machine called Monster – Measures the vertical acceleration ( in g’s) of the handlebars when a bicycle runs over a block 50 mm tall – For this reason, the team included “maximum value from the Monster” as a metric