TEST BENCH RELATING TO A DYNAMIC WEIGHING SYSTEM WHICH OPERATES AT HIGH SPEED AND WHICH IS DESIGNED FOR MEASURING THE STATIC LOAD OF THE AXLES AND THE TOTAL WEIGHT OF VEHICLES

摘要

The invention relates to a test bench which is dedicated to verifying the functionalities of dynamic weighing systems operating at high speeds. This test bench makes it possible to measure the static load of the axle and the total weight of transport vehicles in a situation very similar to the measurement which is carried out under normal road traffic conditions, characterised by a roadway and real traffic. The test bench is constituted by a roller (2), the face portion (contour) of which represents the structure of the roadway and in which the piezoelectric sensors are embedded. This roller, which rotates about its axis, is driven by the asynchronous electric motor (3) by means of the power transmission chain (5). The rotation speed of the motor is variable and is controlled by the speed variator (24). A wheel (1) which is mounted on a suspension system is placed on the travel path (contour of the roller) by means of a fixing and guiding system. A bolt (9), to which calibrated standard masses (22) which are recognised as being true and which can be added according to the desired weight, is welded to the shock absorber mounting rod. The assembly constituted by the coupled wheel of the suspension system, the fixing system and the standard masses have a single degree of freedom along the axis Z (vertical axis). The linear speed of the wheel is fixed in accordance with the rotational speed of the electric motor. As a result of the causal factors connected with the speed of the wheel, the covering profile and the suspension system, the movement of the wheel makes it possible to generate instantaneous forces which are applied to the roadway and consequently to the piezoelectric sensors. An electronic board which is received within the roller makes it possible to acquire the electrical signals produced by the piezoelectric sensors and to transmit them via radio waves to another electronic board which is located outside the roller for processing and calculating the static load of the axle and the total weight of vehicles.