The article discusses the use of pivot bearing friction liners, made of selected materials, in railway freight wagons’ spherical centre bowls. Comparative studies on the effect of suspension dynamics on the equivalent stresses in the liner material were carried out using the finite element method and multibody simulation. The results show the magnitude and location of the highest stresses in the liner with varying input loads, friction coefficients and interacting materials. The analysis is a basis for a simulation method for predicting the fatigue life of the suspension friction liner placed in the centre bowl between the bogie frame and the vehicle body.
This paper presents the problem of vibrations generated by the transport infrastructure. Two aspects of influence on the environment are presented: the harmful influence of vibration on people, and effect on engineering objects. Content of work concerns the identification of dynamical influences, planning of studies, building of models, and validation of their parameters. Simulation methods, based on conducting the experimental pilot studies each time, for the purpose of analysis were presented. In this document, particular attention was paid to the identification of vibration's sources, propagation and evaluation of the vibrations' impact caused by transport means, and operated transport infrastructure. This paper illustrates steps in the research within the analysis, summarizes the existing evaluation methods, and indicates an effective evaluation way for the study area and transparent interpretation level of dynamic influences.Keywords Transport · Paraseismic vibration · Vehicle-environment system's dynamic · Vibroisolation systems Abbreviations accAs a subscript, the acceptable value of the limit specified or calculated on standard's basis a k Prognosed or measured in experimental investigation value of acceleration inEngineering object (e.g., building structure) f Center frequency of ith one-third octave band (Hz)Vector of one-third octave frequency bands, dim F t = 1 × n, where n = 30 or n = 31 FEM Finite element method FIT Fit coefficient of output characteristics obtained from the model and the real object FPE Akaike's final prediction error G-F Phenomena of ground-foundation contact area i Number of ith one-third octave center frequency band k Impact direction/propagation of mechanical vibrations selected from a set of three directions of the Cartesian coordinate system K AIC Akaike's information criterion
This paper presents an example of low-floor trams simulation tests. The tram under study was unique because of using the system of independently rotating wheels in the bogie IRW ("Chudzikiewicz et al., in:The structural design of a modern, completely low-floor tram with independently rotating wheels (Report in Polish) NCBiR-DEMONSTRATOR+, Warsaw University of Technology Faculty of Transport-PESA Bydgoszcz, 2014"). In this paper, the dynamic behavior of the vehicle was examined, and the phenomenon of wheels and rails wear, during the rolling contact, was subjected to the identification. For this purpose, a dedicated computational model was built in MATLAB environment, taking into account the phenomenon of kinematic pair wear using Archard's model.
In this work, the problematic identification of the main sources of noise occurring from the exploitation of railway vehicles moving at a speed of 200 km/h were analyzed. Within the conducted experimental research, the testing fields were appointed, measurement apparatus selected, and a methodology for conducting measurements was defined, including the assessment of noise on a curve and straight track for electric multiple units of the so-called Pendolino, an Alstom type ETR610 series ED25 train. The measurements were made using a microphone camera Bionic S-112 at a distance of 22 m from the track axis. As a result of the conducted experimental research, it was indicated that the noise resulting from vibrations arising at the wheel-rail contact (rolling noise) was the dominant source of sound.
The purpose and scope of this paper are to provide guidance of the potential impacts of being subjected to high level noise recorded on 1st generation (30 years old) floating storage and offloading vessels (FSO) in sector offshore. The international community recognizes that vibroacoustic impacts from commercial ships may have negative consequences for both humans (worker’s) and marine life, especially marine mammals. As regards the effect of noise on human health, there are legal requirements imposing the noise exposure control on personnel working on ships. The acceptable noise exposure standards are established in European Union Directive 2003/10/EC (2003), the NOPSEMA Regulation (2006), the Maritime Labor Convention (MLC) guidelines (2006), and the recommendations of the International Maritime Organization IMO contained, e.g., IMO MEPC.1/Circ.833 (2014). These regulations inform employers and employees what they must do to effectively protect both the marine environment and the health and life safety of workers employed in the maritime industry offshore. This study also presents an analysis of the results of noise measurements carried out on exemplary 1st generation FSO units.
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