Weighing-in-motion (WIM) Weigh-in-motion or Weighing-in-motion (WIM) devices are designed to capture and record axle weight and gross vehicle weight when a vehicle is driving over a measuring site. Unlike static scales, the WIM system is capable of measuring vehicles traveling at reduced or normal traffic speeds and requires no vehicle to stop. This makes the weighing process more efficient, and, in the case of commercial vehicles, allows trucks below the weight limit to cut static or inspection scales.
Video Weigh in motion
Street app
Specifically for gross vehicle trucks and heavy axle monitoring is useful in a variety of applications including:
- Design, monitoring, and pavement research
- Bridge design, monitoring, and research
- Size and weight enforcement
- Rules and regulations
- Administration and planning
Weigh in the scale of motion is often used for weight sizes and enforcement, such as the Federal Motor Carrier Safety Administration Information System and Vehicle Network. The Weigh-in-motion system can be used as part of a traditional roadside inspection station, or as part of a virtual inspection station.
The last few years have witnessed the emergence of several special "Weigh-in-Motion" systems. One popular example is the garbage front fork truck scale. In this app, a container is weighed - full moment - when the rider lifts, and again - when empty - when the container is returned to the ground. The difference between full and empty weights is equal to the weight of the content.
System basics
Sensor
The WIM system can use different types of sensors for measurement. The most important quantity to measure is the vertical force (z component) without the influence of force in the other direction or the speed of the passing vehicle. The style sensor with quartz crystals is the most rigid and measures only one direction along the vertical axis. When the force is applied to the upper surface of the sensor, quartz crystals produce an electrical charge that is proportional to the applied force. The signal is a very high impedance electrical charge, which is not susceptible to electrical interference.
Charging amplifier
The high impedance charge signal is amplified with the charge amplifier based on the MOSFET and converted to the output voltage, which is connected to the analysis system..
Inductive loop
Inductive loop determines vehicle entry and exits from WIM station. These signals are used as input triggers to start and stop measurements to initiate the total weight of the gross vehicle of each vehicle. For toll gate or low speed applications, inductive loops can be replaced with other types of vehicle sensors such as light curtains, axle sensors or piezocables.
Measurement system
High speed measurement systems are programmed to perform the following parameter calculations:
Axle spacing, Individual axle weights, Gross Vehicle Weight, Vehicle Speed, Spacing between vehicles, and GPS synchronized time for each measurement vehicle
The measurement system must be environmentally protected, should have a wide operating temperature range and be resistant to condensation.
Communications
Various communication methods need to be installed on the measurement system. Modem or mobile modem can be provided. If there is no communications infrastructure, the WIM system can operate on its own when storing data, to then physically retrieve it.
Data archiving
WIM systems connected to any available means of communication can be connected to a central monitoring server. Automatic data archiving software is required to retrieve data from many remote WIM stations in order to be available for further processing. The central database can be built to connect multiple WIMs to the server for various monitoring and enforcement purposes.
Maps Weigh in motion
The rails app
Weighting in motion is also a common application in rail transport. Known apps are
- Asset protection (imbalance, overload)
- Asset management
- Maintenance planning
- Rules and regulations
- Administration and planning
System basics
There are two main parts to the measurement system: the track-side component, which contains hardware for communications, power, computing, and data acquisition, and components mounted on the rails, consisting of sensors and cabling. The known sensor principles include: The strain gauge
- : measures the strain normally in the rail center
- fiber optic sensor: measures the change in light intensity caused by bending rails
- load cells: Measure strain changes in the load cell rather than directly on the rail itself.
- laser-based system: measuring rail displacement
Yard and main path
Trains are weighed, either on the main line or in the yard. The Weighing in Motion system mounted on the main line measures the complete weight (distribution) of trains as they pass at determined path speeds. Therefore, weighing of movement on the main line is also referred to as the "weighing of the sequential motion": all the coupled trains are coupled. Weighing in movement in the yard often measures individual carriages. This requires a railcar that is released at both ends for weighing. Weighing in motion in the yard is therefore also referred to as the "immovable lottery". The system installed in the yard usually works with lower speed and has a higher accuracy.
Air apps
Some airports use aircraft weighing, where airplane taxis cross the scale bed, and the weight is measured. The weight can then be used to correlate with pilot log entries, to ensure there is enough fuel, with little margin for safety. It has been used for some time to save on jet fuel.
Also, the main difference in this platform, which is basically a "heavy transmission" application, there is checkweigher, also known as dynamic scale or scale in motion.
References
Source of the article : Wikipedia
0 Comments