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Decision matrix (weighted / Pugh) templates

Pugh Matrix — E-bike Battery Mount Concepts

A weighted Pugh matrix screening four battery-mount concepts against the current down-tube rail, with one measured row — pack plus mount mass — compared with the datum's own value. The under-seat cassette leads with a weighted net of +0.40, better on four criteria and worse on one, and holds unless the weight on weight distribution more than doubles from 15% to 32%. Illustrative values.

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Template previewDecision matrix (weighted / Pugh)
E-bike battery mounting — Pugh concept screeningE-bike battery mounting — Pugh concept screeningRound 1, judged against the current down-tube railWeighted Pugh matrix+ / S / − vs datum8 criteria5 optionsDatum: Down-tube railCRITERIONWEIGHTDown-tuberailcurrent productionDATUMIn-tubecartridgeremovable throughthe top tubeRear-rackpackUnder-seatcassetteRECOMMENDEDFrame-sideclipWeight distribution15%S+−−S+Theft resistance15%S++−+−Water ingress (IPX)15%S+S+−Swap time10%S−++++Frame stiffness15%S−SSSTooling cost10%S−−+−SCable routing10%S+−S+Pack + mount massmeasured, g · lower is better10%S3,150 g−3,320 g−3,460 g+3,060 g−3,190 gΣ +criteria better than the datum—4243Σ Scriteria the same as the datum—0232Σ −criteria worse than the datum—4413Net scoreΣ+ − Σ−, unweighted00−3+3+1Weighted netΣ weight × mark0.00+0.15−0.45+0.40+0.05Rankhighest score first4th2nd5th1st3rdWeighted net against the datumBars to the right are better than the datum, to the left worse; ranked best first.−0.4−0.20.0+0.2+0.4datum · Down-tube railUnder-seat cassette+0.40In-tube cartridge+0.15Frame-side clip+0.05Down-tube rail0.00Rear-rack pack−0.45FINDINGS & SENSITIVITYROBUSTUnder-seat cassette leads with a weighted net of +0.40 against Down-tube rail: better on 4 criteria, worse on 1 criterion.Sensitivity (robust): In-tube cartridge draws level with Under-seat cassette if the weight on “Weight distribution” rises from 15% to 32% (+17points), the other weights rescaled in proportion — the smallest single-weight change that changes the winner.Illustrative judgements for a fictional urban e-bike programme.Measured row: pack plus mount mass, compared with the datum's own value.

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title "E-bike battery mounting — Pugh concept screening"
subtitle "Round 1, judged against the current down-tube rail"
baseline "Down-tube rail"
note "Illustrative judgements for a fictional urban e-bike programme."
note "Measured row: pack plus mount mass, compared with the datum's own value."

option "Down-tube rail" "current production"
option "In-tube cartridge" "removable through the top tube"
option "Rear-rack pack"
option "Under-seat cassette"
option "Frame-side clip"

"Weight distribution"       weight 15 : D  +   --  S   +
"Theft resistance"          weight 15 : D  ++  -   +   -
"Water ingress (IPX)"       weight 15 : D  +   S   +   -
"Swap time"                 weight 10 : D  -   +   +   ++
"Frame stiffness"           weight 15 : D  -   S   S   S
"Tooling cost"              weight 10 : D  --  +   -   S
"Cable routing"             weight 10 : D  +   -   S   +
"Pack + mount mass" weight 10 unit "g" lower : 3,150 3,320 3,460 3,060 3,190