Results of experimental studies of the mutual influence of tenometric sensors on the plane elements of the road machine design

Abstract

Analysis of the use of road vehicles in recent years shows an increasing trend continuous mode of their operation. In these circumstances, it is important to know the current technical status condition of the road machine. To a large extent, this is determined by the reliability of the measurement information about dynamic loads on the structural elements of a road machine. In order to increase the accuracy and reliability of dynamic measurements of loads, the authors conducted a number of experimental studies. Experimental studies of the mutual influence of strain gauges on the errors of dynamic load measurements on the structure of the road machine were carried out using a model of the planar element of the structure of the road machine. A computerized four-channel spatially distributed measurement information system was used in the experimental studies. Research results are presented mutual influence of strain gauges under various static and dynamic loads. It is established that due to the action of inertia forces and acceleration, the interaction between the sensors is manifested to a greater extent. Using the methods of comparison, comparison and complex analysis of the results of experimental studies, the dependences of the errors of dynamic load measurements on the angle of action and load removal were established. According to the results of research, the functions of dependence of dynamic loads on the direction and force of action on each of the 4 strain gauges, taking into account their mutual location, are obtained. It is shown that the experimentally obtained coefficient of the interconnection of strain gauges depends on both the mutual location of the sensors and the spatial direction of the force and has a nonlinear dependence. The experimentally determined error function between the four strain gauges was 3%. The reason for the increase in measurement errors of dynamic planar loads is the displacement of the operating point upwards by the transformation function at positive load, or downwards at negative load. The magnitude of the displacement depends on both the magnitude of the load and its removal.The results obtained will allow optimizing the placement and number of strain gauges on board Measuring Information System on the structure of of the road machine. As a result, the accuracy and reliability of measuring the parameters of the dynamic loads of the road machine will significantly increase.