Abstract
With the development of the Highway Transportation and Business Trade, vehicle weigh-in-motion (WIM) technology has become a key technology and trend of measuring traffic loads. In this paper, a novel capacitive flexible weighing sensor which is light weight, smaller volume and easy to carry was applied in the vehicle WIM system. The dynamic behavior of the sensor is modeled using the Maxwell-Kelvin model because the materials of the sensor are rubbers which belong to viscoelasticity. A signal processing method based on the model is presented to overcome effects of rubber mechanical properties on the dynamic weight signal. The results showed that the measurement error is less than ±10%. All the theoretic analysis and numerical results demonstrated that appliance of this system to weigh in motion is feasible and convenient for traffic inspection.
Highlights
Nowadays a large majority of freight transportation is made by road in most countries, and the volume of ground transportation is keep increasing as the result of the fast growing industry and commerce
To measure the unknown capacitance Cx, two square-wave signals are applied to two complementary metal-oxide-semiconductor (CMOS) switches (CD4066), S1 and S2, so that the left side of Cx is connected either to Vc or earth
In order to decrease the effect of time, the weigh-in-motion system presented in the paper only records the instantaneous strain produced by the instantaneous constant stress, namely elastic strain ε 0 as the axle load such as the voltage of A point shown in Fig. 6 and 7
Summary
Nowadays a large majority of freight transportation is made by road in most countries, and the volume of ground transportation is keep increasing as the result of the fast growing industry and commerce. Weigh-in-motion (WIM) is the technology for measuring the weight of moving vehicles. For gross weight measurement mode, the use of a larger scale platform caused the increases in difficulty of implement and the cost of construction. Today there are four major types of sensors that are used for a number of applications comprising traffic data collection, and weigh station enforcement: piezoelectric sensors, bending plate, load cell and optic fiber [5,6,7,8,9]. When an array of these polarized crystals are placed between two metallic plates, an externally applied force is converted to a proportional charge. As a vehicle passes over the load cell, the system records the weights measured by each scale and sums them to obtain the axle weight.
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