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Mobilapp för jämnhetsmätning på cykelvägar
Anna Niska
Varför?
• Effektsamband - funktionskrav
• Komfort
• Restid
• Säkerhet

• Underhållsplanering
• Uppföljning

Illustrativt – enkel kommunikation
Crowd-sourcing
Tidigare studier/ Andra mätmetoder
Modell för att tolka profilmätningen:
cyklisters åk-kvalitet
VTI-appen
Start/Stopp

• Accelerationen i tre riktningar
• Ungefär ett mätvärde per meter (RMS)
• Medelvärden över 50-meters sträckor

• Automatisk fotografering
• vid varje gps-position

• Hastighet
Frågeställningar
• Repeterbarhet?
•
•
•
•

Cyklist
Hastighet
Cykel
Telefon

• Jämförbarhet med andra mätmetoder?
• Överensstämmelse med cyklisters upplevelse?
Cyklistutvärdering - testslinga
13 cyklister
3 varv var
2 olika cyklar
2 mobiltelefoner
på varje cykel

RST-mätning
VTI RST
Montering av telefoner
Sträckor av varierande kvalitet/material
Teststräcka A – små plattor
Teststräcka B – äldre asfalt
Teststräcka C – stora plattor
Teststräcka D – grusyta
Teststräcka E – nylagd asfalt
Mobiltelefonen viktig för resultaten

Sträcka A

Sträcka B
Olika sträckor ger olika accelerationsvärden
A

1.2

C

D

1

0.8

0.6

0.4

0.2

B
E

0
0

50

100

150

200

250

300
Cyklisternas värdering
Absolut bedömning

Relativ bedömning

1

Kände inte av några ojämnheter i ytan

Mycket bättre

2

Kände ojämnheter, men inget obehag

Något bättre

3

Något obehaglig

Likvärdig

4

Mycket obehaglig

Något sämre

5

Oacceptabel

Mycket sämre

A
B
C
D
E

Medel
3,2
1,2
2,3
2,0
1,1

Min
2
1
2
2
1

Max
5
2
3
2
2

Medel
4,8
1,1
4,1
2,7
1,4
Cyklisternas värdering
Absolut bedömning

Relativ bedömning

1

Kände inte av några ojämnheter i ytan

Mycket bättre

2

Kände ojämnheter, men inget obehag

Något bättre

3

Något obehaglig

Likvärdig

4

Mycket obehaglig

Något sämre

5

Oacceptabel

Mycket sämre

A
B
C
D
E

Medel
3,2
1,2
2,3
2,0
1,1

Min
2
1
2
2
1

Max
5
2
3
2
2

Medel
4,8
1,1
4,1
2,7
1,4
Jämförelse med cyklisternas värdering
A

1.2

C

D

1

0.8

0.6

0.4

0.2

B
E

0
0

50

100

150

200

250

300
Jämförelse med mätning med RST-bilen
Våglängder, ojämnhet och textur

RMS

Megatextur Grov
makrotextur
Slutsatser
• Olika telefoner ger olika kvalitet på resultaten
• GPS-mottagningen?
• Crowd sourcing kan bli svårt

• Olika typer av system kompletterar varandra
• Appen bra som utgångspunkt
• För uppföljning behövs mer exakta system
(profilmätning)

• Tolkning av resultaten
Inventering i Linköping
Fortsatta studier
• Tolkning av data
• Enstaka stötar
• Gränsvärden

• Fler cyklistutvärderingar för skillnader mellan
grupper, individer, fordon, etc.
• Komfortpåverkan av vinterväglag, sand på
barmark, etc.
• Specifikationer för utrustningen
Tack för mig!

Anna.Niska@vti.se

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Session 64 Anna Niska