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A PROPOSED METHOD OF CALIBRATION AND CORRELATION OF WEIGK-IN-MOTION SYSTEMS
| 题名： | A PROPOSED METHOD OF CALIBRATION AND CORRELATION OF WEIGK-IN-MOTION SYSTEMS |
| 作者： | David L Alien and Jerry G. Pigman |
| 关键词： | WIM Systems WIM Calibrations Truck Weights WIM Correlations Distribution Functions |
| 摘要： | There are various types of weigh-in-motion systems currently in use by agencies that collect weight data. These include load cells, bending plate, capacitance parte, piezoelectric cables, and bridge WIM's. The response and behavior of these systems differs from one type to another. Most states calibrate these systems by one of two methods. The first is to calibrate by running a truck or trucks of known weights across (he scales a number of times. The second is to use a sample of trucks from the traffic stream. This report details a field calibration and correlation test site between a slow-speed WIM at a permanent weigh station and five other WIM systems. These other systems were a capacitance pad, a piezoelectric cable installed in a rigid slab, a piezoelectric cable installed in a flexible pavement, abridge WIM installed on a simple span, and a bridge WIM installed on a continuous span. From this test site, a method of calibrating WIM systems was developed that uses the accumulative distribution functions of the vehicle gross weights from the traffic stream. By developing a distribution function tor a standard scale (in this case, the permanent weigh station) and also for the VITIM system being calibrated, a continuous calibration function can be developed between the two systems. Any weights obtained by the calibrated scale in the future can then be corrected to tie standard scale by application of tie continuous calibration function. This report details a recommended calibration procedure tor correcting an scales in tie state by use of calibration distribution Functions. A program program was developed to calculate the distribution and the calibration functions. |
| 报告类型： | 科技报告 |
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