Rich Quinley California Department of Transportation.

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Presentation transcript:

Rich Quinley California Department of Transportation

CTWIM SUITE What is the CTWIM Suite? A Windows based set of applications that can be used by the WIM analyst to: Process data from test trucks to make decisions regarding the calibration, acceptance, and validation of a WIM system Monitor the truck traffic stream through a WIM site for proper system component operation, system calibration, and truck operating characteristics

CTWIM SUITE What documentation is there for the CTWIM Suite? On-line Help screens Hardcopy manual

CTWIM SUITE What is needed to use the program? Both the calibration and traffic stream analysis applications import WIM data from ASCII truck record text files formatted in accordance with Caltrans specifications

Note: Lengths in Feet Weights in Lbs/1000

CTWIM SUITE Where do these files come from? These ASCII text files are created from the “raw” downloaded WIM truck records PAT- Utility included in their application software IRD- Utility available in their application software (std. for CalTrans) ECM, PEEK- Will make utility available upon request Can create from spreadsheets, tables, etc. using import/export

CTWIM SUITE Bending Plate vs. Piezo Systems Program designed around bending plate systems with individual left and right wheel weights Calibration analysis application requires wheel weights- for “axle weight” systems, can use spreadsheet to split axle weights into wheel weights Traffic stream analysis application can use either wheel weights or axle weights

CTWIM SUITE What is my first step? Both the calibration and traffic stream analysis applications utilize a common WIM system configuration database

CTWIM SUITE WIMSys - Evaluate traffic stream The purpose of this application is to evaluate the maintenance of calibration of a WIM system by comparing large samples of specified traffic stream data elements with known operating characteristics of certain vehicle types

CTWIM SUITE WIMSys - Evaluate traffic stream Very easy to use Use seven days of data (Sun thru Sat) to avoid daily bias Looks at Class 9, Class 11, and Class 14 (Caltrans uses Class 14 to capture the “32” truck-trailer combinations due to their unique operating characteristics) User selects desired class or classes

CTWIM SUITE WIMSys - Evaluate traffic stream What are the outputs of this application?

CTWIM SUITE WSDBViewer Takes some “practice” to learn how to use effectively Compares static weights and measured axle spacings of test trucks with their WIM weights and spacings Supports use of Classes 5, 6, 9, 11, and 14 (32) Supports multi-sessions and up to four test trucks For analyses of calibration factors and accuracy validation

CTWIM SUITE WSDBViewer procedure- on-site I nsure that the required number of test truck runs are made throughout the specified speed ranges Record WIM system assigned vehicle number for each test truck pass Upon completion of each set of test truck runs, download the WIM data file(s) covering the period(s) of the test truck runs

CTWIM SUITE WSDBViewer procedure Create the ASCII Truck Record files -- Using the WIM vendor’s application software, or Using spreadsheet import/export functions

CTWIM SUITE WSDBViewer procedure Create a Calibration Run to record the information obtained during a specific session of test truck runs.

CTWIM SUITE WSDBViewer procedure For each set of test truck runs, record the Dates and Times when the testing occurred

CTWIM SUITE WSDBViewer procedure Enter the static weight and axle space measurements for the test trucks into the Static Data Records

CTWIM SUITE WSDBViewer procedure Record the Vehicle Numbers of the test trucks in the Vehicle Numbers Table (must be entered in the same order as they appear in the WIM data-collection stream)

CTWIM SUITE WSDBViewer procedure Perform Query Vehicle Data procedure to import test truck WIM data

CTWIM SUITE WSDBViewer procedure Run the Calibration Report Select the appropriate filter-criteria and options to limit the report's scope and set its content

CTWIM SUITE WSDBViewer What are the outputs of this application? Graphs and reports for calibrating a WIM system (adjusting system calibration factors) Summary statistical reports for determining compliance with validation requirements

CTWIM SUITE WSDBViewer - Calibration Analyses Examine plots of test trucks’ gross weight and axle/axle group weight patterns through the entire range of speeds to determine what WIM system calibration weight factor settings will result in the system’s generating the most accurate estimate of static weights for the most typical trucks in the traffic stream

Caltrans specifications require that: “The WIM system shall provide for calibration features such that the required accuracies can be met at all speeds within the operating speed range set forth under …”

CTWIM SUITE WSDBViewer - Calibration Analyses What is the purpose of these graphical comparisons? Should one of the axle groups be tossed out in determining calibration factor adjustments? Is the WIM system “calibratable”?

CTWIM SUITE WSDBViewer - Calibration Analyses Examine WIM VS STATIC WTS/SPACINGS DETAILED REPORT to determine Should any of the test truck record be dumped Corrections to be applied to systems speed/spacings factors

CTWIM SUITE WSDBViewer - Validation Analyses Examine WIM VS STATIC WTS/SPACINGS STATISTICS REPORT to determine compliance with accuracy validation requirements