• Share
  • Email
  • Embed
  • Like
  • Save
  • Private Content
Measuring Pavement Deflection Variance At Highway Speeds
 

Measuring Pavement Deflection Variance At Highway Speeds

on

  • 601 views

Presentation of the Defectograph method at BCRA´05 in Trondheim.

Presentation of the Defectograph method at BCRA´05 in Trondheim.

Statistics

Views

Total Views
601
Views on SlideShare
591
Embed Views
10

Actions

Likes
0
Downloads
0
Comments
0

1 Embed 10

http://www.linkedin.com 10

Accessibility

Categories

Upload Details

Uploaded via as Microsoft PowerPoint

Usage Rights

© All Rights Reserved

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Processing…
Post Comment
Edit your comment

    Measuring Pavement Deflection Variance At Highway Speeds Measuring Pavement Deflection Variance At Highway Speeds Presentation Transcript

    • MeasuringPavement Deflection Variance at Highway Speeds Photo: Scania Media Services J Granlund, C A Lenngren, F Lindström B Mårtensson 7th Int Conf on Bearing Capacity of Roads, Railways and Airfields, 2005, Trondheim, Norway
    • “Soft spots” can be amusing… Video: Felicia Broberg, age 117th Int Conf on Bearing Capacity of Roads, Railways and Airfields, 2005, Trondheim, Norway
    • Presentation outline• Soft spot measurement principle• Accuracy: Reasonable precision, promising trueness• Better profiling with virtual tire footprint road sensor• Extremely uncomfortable seat vibration @ 30 km/h• EU WBV action value exceeded @ all sites• Road agencies should focus on WBV exposures, affectingcomfort and health 7th Int Conf on Bearing Capacity of Roads, Railways and Airfields, 2005, Trondheim, Norway
    • The soft spot measurement principle Profilo- 3D Simulating Calculated metry model truck ride responseLaser/inertial Profilograph Differences = Soft spots? Measuring real True truck truck vibration responseFull loaded heavy truck 7th Int Conf on Bearing Capacity of Roads, Railways and Airfields, 2005, Trondheim, Norway
    • Objective of the workInvestigate trueness and precision 7th Int Conf on Bearing Capacity of Roads, Railways and Airfields, 2005, Trondheim, Norway
    • Precision: Repeatability O 2183, Dals Ed - Nössemark 30 km/h 100% 90% 4.2 % standard 80% deviation between 3 70% 60% truck runsLikeness 50% 40% 30% 20% 10% 0% 200 400 600 800 1000 1200 1400 1600 1800 2000 Distance [m] Run 1 Run 2 Run 3 7th Int Conf on Bearing Capacity of Roads, Railways and Airfields, 2005, Trondheim, Norway
    • Precision: Reproducibility AC 600, Östra Strömåker 30 km/h versus 50 km/h 100% 90% 3.7 % standard 80% deviation between run @ 30 km/h and 70% 60%Likeness 50% @ 50 km/h 40% 30% 20% 10% 0% 0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 Distance[m] 30 km/h, springtime 50 km/h, springtime 7th Int Conf on Bearing Capacity of Roads, Railways and Airfields, 2005, Trondheim, Norway
    • Precision: Reproducibility BD 374, Norr Storfors. 2 runs at 30 km/h 100% 4.8 % standard deviationSimulated and measured wheel vibration likeness 90% 80% between spring and 70% autumn run 60% Lower likeness during 50% spring. Softer pavement 40% due to thaw? 30% 20% 10% 0% 400 900 1400 1900 2400 2900 3400 Distance [m] Spring Autumn 7th Int Conf on Bearing Capacity of Roads, Railways and Airfields, 2005, Trondheim, Norway
    • Trueness - Falling Weight Deflectometer AC 600, Östra Strömåker 1000 100% 90% 80% Truck wheel vibration likeness 70% 60% Log E u [MPa] 100 50% 40% 30% 20% 10% 10 0% 7250 7450 7650 7850 8050 8250 Distance [m] Eu min, springtime Wheel vibration likenessSoft subgrade with Eu down to 24 MPa @ indicated soft spots 7th Int Conf on Bearing Capacity of Roads, Railways and Airfields, 2005, Trondheim, Norway
    • Trueness - Ground Penetrating RadarPoor pavement integrity @ soft spots, due to frost fatigue 7th Int Conf on Bearing Capacity of Roads, Railways and Airfields, 2005, Trondheim, Norway
    • Virtual tire footprint sensorTires are 200 – 400 mm wide. The laser beam is < 1 mm wide.The virtual tire footprint (VTF) sensor covers 300 mm width. 90%The VTF sensorestimates the tireperceived road profile 85% Average vibration likeness over 6 km 85.3% 83.6%much better. 80% 79.1% 77.4% 74.7% 74.5% 74.5% 75% 70% Tire footprint Laser 12 Laser 13 Laser 14 Laser 15 Laser 16 Tire footprint sensor A sensor B Longitudinal profile recorded by different sensors 7th Int Conf on Bearing Capacity of Roads, Railways and Airfields, 2005, Trondheim, Norway
    • Seat vibration @ 30 km/h Worser ride at road with lower IRI 2,5 6 5,50 2,31 2,24 5 ISO 2631-1(1997): 2RMS of weighted vibration 4,34 1,70 4,13 ”Extremely 3,95 acceleration [m/s 2] 4 uncomfortable” = 2 m/s2 1,5 IRI [mm/m] 1,14 3 1 0,85 0,73 0,74 2 0,56 2002/44/EC: 0,5 1 Action Value A(8) = 0,5 m/s2 0 0 O 2183 O 1996 AC 600 BD 374 Test site Average vib level Max transient 1 s vib value IRI 20 m average value 7th Int Conf on Bearing Capacity of Roads, Railways and Airfields, 2005, Trondheim, Norway
    • Conclusions• Reasonable precision• Promising trueness• Successful virtual tire footprint sensor for road profiling• Extremely uncomfortable seat vibration @ 30 km/h• EU WBV action value exceeded @ all sites• Road with lower IRI was much more uncomfortable• Road agencies should focus on WBV exposures, affectingcomfort and health 7th Int Conf on Bearing Capacity of Roads, Railways and Airfields, 2005, Trondheim, Norway
    • Acknowledgements• Nordic Road Association• Swedish Road Administration• Axiom EduTech AB• Malå GeoScience and Radar Väg Analys AB 7th Int Conf on Bearing Capacity of Roads, Railways and Airfields, 2005, Trondheim, Norway
    • Comfort, comfort my people, says your God.A voice of one calling in the desert;-Prepare the way for the Lord, make straight paths for him.Every valley shall be filled in, every mountain and hill made low.The crooked roads shall become straight, the rough wayssmooth.The path of the righteous is level;O upright One, you make the way of the righteous smooth.And all mankind will see Gods salvation.Isaiah 26:7 Isaiah 40:1,3-5 Luke 3:5 7th Int Conf on Bearing Capacity of Roads, Railways and Airfields, 2005, Trondheim, Norway