Ovidiu Vasile

Analysis of the Human Health and Safety Requirements to Vibration Generated Risks

Having as starting point the fundamental requirements outlined in Directive 2002/44/CE in which the minimum health and safety requirements for the workers’ exposure to the risks generated by physical agents (vibrations) are established, the paper presents a concrete evaluation, based on experimental determinations, of the vibrations transmitted to the entire body of a human operator. The evaluation of the level of exposure to vibrations is based on the computation of the daily exposure, expressed over a period of eight hours. The weighted mean square acceleration will be determined function of the frequency weighting curves Wc, Wd and Wk , using a MATLAB program developed by the author. Based on the indications from SR ISO 2361-1 the evaluation of the vibrations for health, comfort, and perception are presented as experimental results. In this context, the necessity of compliance with the minimum health and safety requirements imposed by the current legislation are highlighted.

Viscoelastic Model for the Rigid Body Vibrations of a Viaduct Depending on the Support Devices’ Rheological Model

Rezumat Lucrarea abordează comportarea unui model de solid-rigid cu anumite simetrii structurale. Aceste simetrii permit simplificarea calculelor (ecuaţii de mişcare) şi, deci, a modelelor matematice. Dacă solidul rigid este conectat la structură prin patru legături elastice, modelul rămâne încă simplu şi uşor de rezolvat, vibraţiile putând fi decuplate în patru subsisteme de mişcare. În final, se prezintă un studiu de caz pentru analiza modală a unui viaduct, modelat precum un corp solid-rigid, rezemat elastic, de pe autostrada Transilvania (km 29+602.75 m).