Abstract
This paper presents the analyses of the signals recorded by the main sensors of a WIM test station in the cases of abnormal runs (i.e., runs with the changes of trajectory or the dynamics of vehicle motion). The research involved strain gauges which are used for measuring the weight of vehicles, inductive loops, as well as piezoelectric sensors used, inter alia, to detect twin wheels and to determine where a vehicle passes through a station. Since the designers intend the station to be able to implement the direct enforcement function, the selection of runs deviating from the normative ones constitutes an important issue for the assessment of the measurement reliability. The study considered the location of the trajectory of the runs, the dynamics (acceleration/braking) and the trajectory changes. The change in the amplitude and the value of the signal recorded by the strain gauges as a function of the location (position) of the contact between sensor and tires is a noteworthy observation which indicates the need to monitor this parameter in automatic WIM systems. Other tests also demonstrated the influence of the analysed driving parameters on the recorded results. However, by equipping the WIM station with a set of duplicate strain gauges, the measurement errors of the gross weight and axle loads are normally within the accuracy limits of class A(5) stations. Only in the case of accelerating/decelerating, does the error in measuring the load of a single axle reach several per cent.
Highlights
Weigh-In-Motion (WIM) systems are in many countries the primary source of information about overloaded vehicles on the road
Thedynamics average relative error is still in the station on the signals generated by the sensors
Based on the research presented in this theenforcement following conclusions havethem been to drawn: The practical use of WIM
Summary
Weigh-In-Motion (WIM) systems are in many countries the primary source of information about overloaded vehicles on the road. It was pointed out that these algorithms do not solve, for example, the problem of driving against and with the wind Another direction aimed at reducing the impact of dynamically varying wheel loads is the multi-sensor WIM installation (MS-WIM) which provides multiple measurements of the instantaneous load on each axle. The novelty of this paper is the description of the analysis of the results obtained from an experiment involving the changes in trajectory and the dynamics of a vehicle which was performed in real traffic conditions on a test station. It is the first step of building new functionality of assessing the reliability of the WIM measurement. Waveforms these signals recorded for runs considered by the authors as normative
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