Arhive lunare: ianuarie 2015


26-40 CONTRIBUŢII PRIN MĂSURĂTORI LA STUDIUL VIBRAŢIILOR TRANSMISE ORGANISMULUI UMAN

CONTRIBUTIONS BY VIBRATION MEASUREMENTS TO STUDY SUBMITTED HUMAN BODY

This paper contains a study on the effects of vibration and permissible limits human. Complexity factors acting on the body and need precise measurements of vibrations imply reliability and precision. By using devices SVAN 958 and IHVM 100 is successfully creating precision measurements and also being portable allowing easy movement to any area for fast setup.
Keywords: vibration, effects, extent, medium

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26-39 UTILIZAREA FORŢEI ELECTROMAGNETICE LA ROPULSAREA UNUI PROIECTIL

PROJECTIL PROPULSION BY ELECTROMAGNETIC FORCE
The paper presents experiments using a laboratory model at small scale for a “coil gun” type projectile launcher. Electromagnetic acceleration of a mobile fitting by a coil (stator) travelled by an electric current is a phenomenon known in the 18th century and knows many applications of this phenomenon. Explanation refers to what passes through the stator currents and armour as well as mutual inductance variation of these. Inductance mutual values are found by means of approximation.
Keywords: electromagnetic force, projectile, ballistics parameters

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26-38 INFLUENŢA TEMPERATURII ASUPRA FRECVENŢELOR PROPRII ALE ELEMENTELOR DIN STRUCTURI CU ZĂBRELE

TEMPERATURE EFFECT UPON THE NATURAL FREQUENCIES OF THRUSS ELEMENTS
In this paper we analyze the effect of temperature upon the natural frequencies of truss elements. Temperature changes influence the Young’s modulus in the sense that it decreases with increasing temperature, consequently structural elements frequencies decrease. However, we demonstrate in this paper that the frequency changes due to temperature in natural environment are very small and do not dramatically influence the structures dynamic behavior.
Keywords: temperature, Young modulus, frequency, truss structures

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26-37 CONSIDERAȚII PRIVIND EFECTELE NON-INVAZIVE ALE ZGOMOTULUI ASUPRA LUCRĂTORILOR DIN CONSTRUCȚII CIVILE

CONSIDERATION REGARDING THE NON INVASIVE EFFECTS OF  NOISE  ON THE CIVILE CONSTRUCTIONS WORKERS

This paper  contains considerations about the noise effects on   the health of workers. There are  definition of the noise and the causes of the noise pollution în our  modern society and describe the  negatives effects  of the  higher noise level that the workers has to deal with în the  construction sites.

Keywords: noise, non invasive effects of noise level limits

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