At present, all railways tend to increase the speed of passenger trains and axle loads in transportation of goods. These processes contribute to the improvement of rolling stocks and railway infrastructures. At the same time, there is a need to maintain a high level of safety in transportation. Therefore, experimental research and feasibility studies of the existing monitoring solutions are of the highest priority. Being experimental in nature, this study is aimed at increasing the reliability of the strain-gauge method in measurement of dynamic forces transferred from the wheel to the rail in real operating conditions. Rail strains were experimentally studied under bidirectional loading using a special-purpose impact device. Results of this research are presented in the paper. An experimental measuring section was created for recording loads. Strain gauges were installed on rails in several cross-sections. Rails were loaded with a special-purpose device, which was designed to adjust a loading force and shift a contact point. The structure of the loading device and its basic features are described in the paper.
The results of numerical (in the COSMOS/M environment) and physical simulations of the processes of acoustic wave propagation in homogeneous linear, flat, and bulk bodies are presented. The characteristics of longitudinal waves as functions of the boundary conditions (rigid and hinged fix ation, interface between media) were obtained numerically. The waveguide properties of models near geometrical concentrators in the form of a hole and a crack were investigated under pulsed external actions. The fields of dynamic displacements and stresses were calculated.
Experimental results of amplitude-frequency response for acoustic emission sensors are obtained by using a mechanical source of continuous noise. The amplitude-frequency characteristics of a calibrated transducer are analyzed during the registration of longitudinal, surface and Lamb waves. Experimental characteristics of different-type bandpass sensors installed on the object are discussed.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.