Mjerenje stupnja prigušenja vibracija na klasičnim kolosiječnim konstrukcijama

Abstract

The rail-track vibration damping level, as one of key properties for determining proportion of rail track influence in the total rail traffic noise and vibration levels, is estimated in the paper. A detailed overview of research conducted so far on dynamic properties of rail tracks is given, and the methods presented are compared on two test sections. The data processing method, various accelerometer positons, and various types of modal hammers as excitation sources, are also considered in the analysis of measurement results. The results obtained by various analyses are compared to each other so as to increase accuracy in the determination of the vibration damping level. Mjerenje stupnja prigušenja vibracija na klasičnim kolosiječnim konstrukcijama U radu se ocjenjuje stupanj prigušenja vibracija na kolosijecima, jednog od ključnih svojstava pri određivanju utjecaja kolosijeka u ukupnim razinama buke i vibracija od prometovanja tračničkih vozila. Prikazan je i detaljan pregled znanstvenih istraživanja na temu dinamičkih svojstava kolosijeka, a navedene metode uspoređene su na dvije ispitne lokacije. Nadalje, u analizi rezultata mjerenja razmatra se metoda obrade podataka, različite pozicije akcelerometara i različiti tipovi modalnih čekića kao izvora pobude. Rezultati dobiveni različitim analizama međusobno su uspoređeni u svrhu što preciznijeg određivanja stupnja prigušenja vibracija.

Analysis of vehicle/track interaction measurement data using the V/TI Monitor system

“…These defects, which are often overlooked by railroad personnel, in combination with the aforementioned increasing speeds and loads, could produce extremely high impact forces, which could lead -due to passage of a large number of vehicles -to accelerated deterioration of all RIE, with unforeseeable consequences, Figure 1 [5]. As it is often explicitly stated, impact forces that occur as a result of local irregularities at the wheel/rail contact are often the main cause of track deterioration [6,7]. On the other hand, these defects precisely indicate the target group or, more specifically, the origin of the motives for creation and utilization of the V/TI Monitor system, whose data will be analysed in the context of this article, and based on which, in accordance with the basic principles of vehicle dynamics, certain mechanisms leading to creation of various defects will be defined.…”