Profilograph. Changes in Profiling Technology

Transcription

1 Profilograph Changes in Profiling Technology Lightweight Profiler High Speed Profiler 1

2 How Does It Work? Lightweight Profiler Laser Sensor 2

3 The Laser Sensor! Laser samples the pavement 16,000/sec! Samples are averaged and that value is stored every 3! Accelerometer measures long wavelength features! Accelerometer and laser signal are combined to remove the vertical bounce of the vehicle during data collection! Collects the true profile of a pavement 3

4 Profiler Features! Lightweight profilers operate at speeds from 5-15 mph! High speed profilers operate at speeds from mph! Inertial profilers must maintain a minimum speed during data collection! Can measure pavement wavelengths from feet 4

5 Profiler Outputs! Can simulate a California style profilograph profile! Can simulate a rolling straightedge profile! Can calculate several indices including: IRI, PI, RN and RQI! Can be equipped with dual sensors to profile both wheel tracks simultaneously! Can locate bump and dip locations! Profile data reports can be generated using standard file formats such as: HTML,.ERD & ASC II 5

6 The Benefits! Data can be collected much faster and more efficiently! Profile both wheel tracks simultaneously! Multiple indexes can be calculated from the same profile data! Easily locate out of tolerance areas 6

7 Who Is Using Profilers?! We currently have over 70 profilers in service in 30 states! Nine units currently being used in Louisiana! Most are being used in construction for quality control testing! Most are being used in the profilograph mode! The national trend is to use the IRI index in construction! Currently four states have fully implemented an IRI specification for construction! Ten states have implemented a pilot IRI specification 7

8 What Is the IRI Index?! Pavement profiles generated from inertial profilers are usually used to generate IRI index results. Ames Model 6000 Lightweight Profiler Ames Model 8000 High Speed Profiler 8

9 What Is IRI?! It is a true ride index based on the suspension of a vehicle! Is still expressed in in/mi and calculated every 528 feet! Has been used by state agencies to monitor the condition of existing pavements! California style profilograph cannot calculate the IRI index! Does not use a blanking band as a reference 9

10 How Is IRI Calculated?! Weights profile features based on how they affect a vehicles suspension! Profile features between 5-50 feet have the biggest influence on IRI! The greater the amplitude the more impact on IRI 10

11 Profilograph and IRI Filter Wavelength Response California Style Profilograph Wavelength Response Magnitude IRI Quarter-Car Filter Response Wavelength (ft) Magnitude Wavelength (ft) 11

12 Why Use IRI for Construction?! It is a better indicator of how a road actually rides! Agencies want to use the same index in construction that is used to monitor a pavement throughout it s life! IRI is more repeatable, less prone to wheel track error 12

13 Next Generation Profiling TriODS Laser System (Currently in Production) RTP-Real Time Profiler Available spring

14 New Laser Technology! TriODS laser system! Designed to eliminate pavement texture features! Used on textured concrete and milled surfaces 14

15 Designed to Simulate a Tire Patch To remove the problems associated with longitudinal texture we must add more laser contact points. 3 Laser ODS 3 Laser Contact Point Example 15

16 Real Time Profiler! Attaches directly to the paver! Displays profile in real time while pavement is being placed! Immediately locates out of tolerance areas! Continusouly monitors your profile index, PI & IRI 16

17 RTP Hardware Components Three-Foot Beam Assembly DMI Encoder Rugged Laptop Computer Computer Case Assembly 17

18 Real Time Display With Profilograph Simulation 18

19 Profilograph Questions? Jon Klatt amesengineering.com Lightweight Profiler High Speed Profiler 19