The paper presents issues related to the study of vibrations originating from means of transport. The analysis covered vibrations propagating in the immediate vicinity of a transport route (tram line). The model studies utilized available experimental research results. Parametric models with different architectures were built and tested for the SISO (single-input/single-output) convention. For each case, a full system identification representing the vibration transmission model was performed. Errors associated with all modeling variants were demonstrated. The influence of expanding the levels of the models used on the obtained solution accuracy was discussed. The research utilized proprietary software built in the Matlab environment. The obtained solutions and transfer functions were plotted in the frequency domain, and the dependence of the model equation order on the complexity of the analyzed signals was examined. An attempt was made to determine the selection of the optimal structure and polynomial order necessary for the correct analysis of the phenomenon.INTRODUCTION
Traffic-induced vibrations pose a serious problem for urban areas.
According to the classification, they are an example of paraseismic vibrations, dominated by low-frequency components, which carry the highest doses of vibration energy [1]. The diverse traffic structure in urban agglomerations is a source of vibrations propagating through the ground, often in an uncontrolled manner, to the immediate vicinity of transport infrastructure elements, such as roads, bridges, tunnels, etc. The dense development of urban agglomerations means that within the impact zone of one vibration source, dynamic influences from others with different frequency characteristics occur. Various dynamic interactions occurring in the ground are subject to physical phenomena such as reflection and interference, and cause excitation of surface and underground objects. In the case of surface objects and structures, the excitation of foundations or supporting structures causes inertial displacement reactions of the objects, resulting in the creation of additional vibration sources
[2]. Bearing the above in mind, one must realize the complexity of the issue of assessing the dynamic situation in urban areas. (…)
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Source: Logistyka Magazine 4/2011