Method for weighing vehicles crossing a bridge
First Claim
1. A method for determining weight of a vehicle moving on a bridge, said bridge having a pavement with an accessible lower surface, said method comprising;
- directly coupling downwardly travelling low frequency pavement vibrations generated by one or more wheels of said vehicle moving on said pavement, said body waves propagating generally downward through said pavement to said downwardly travelling low frequency pavement vibrations, said at least one discrete location vibration sensor directly mounted to said lower surface of said pavement generally underneath a lane traveled by said vehicle,using said at least one discrete location vibration sensor to sense said downwardly travelling low frequency pavement vibrations generated by wheels of said vehicle moving on said pavementcomputing weight of said vehicle comprising using sensed said downwardly travelling low frequency pavement vibrations.
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Abstract
A method for weighing vehicles moving on a bridge deck pavement is provided. At least one vibration sensor is mounted on a lower side of the pavement to sense low frequency pavement vibrations generated by moving vehicle wheels and propagated in waves in the pavement. Vibration sensor output signals are provided to a computing device. Sensed vibration energy rate is computed and, with signals from vibration sensors mounted at two locations separated by a known longitudinal distance, vehicle speed is also computed. The weight of the vehicle is determined as the product of a calibration coefficient and the ratio of sensed vibration energy rate to velocity. Using vibration sensor signals indicative of wheel generated vibrations in the very near field and summing vibration energy rates computed from these signals during vehicle passage over the vibration sensors the weight of individual vehicles is computed when other moving vehicles are present.
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Citations
20 Claims
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1. A method for determining weight of a vehicle moving on a bridge, said bridge having a pavement with an accessible lower surface, said method comprising;
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directly coupling downwardly travelling low frequency pavement vibrations generated by one or more wheels of said vehicle moving on said pavement, said body waves propagating generally downward through said pavement to said downwardly travelling low frequency pavement vibrations, said at least one discrete location vibration sensor directly mounted to said lower surface of said pavement generally underneath a lane traveled by said vehicle, using said at least one discrete location vibration sensor to sense said downwardly travelling low frequency pavement vibrations generated by wheels of said vehicle moving on said pavement computing weight of said vehicle comprising using sensed said downwardly travelling low frequency pavement vibrations. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification