Alina-Sabina ŢEPEŞ-BOBESCU


26-36 INVESTIGAREA NON-INVAZIVĂ A ZGOMOTULUI PROFESIONAL ASUPRA LUCRĂTORILOR

NON-INVASIVE INVESTIGATION OF PROFESSIONAL
NOISE OVER THE WORKERS
Ther paper introduces a new investigation method for the noise action
over the worker in the industrial field. This method consists in the ECG
evaluation of the workers that are inside the industrial space during the
professional activity. The paper presents an experimental study of the noise
action on a sample of workers of different ages. They work in an industrial
workers space with 8 different machine tools, 8 hours per day, 5 days per
week. The paper looks to establish the impairment of workers’ occupational
noise. All of them were made in the morning, and at the end of the work each
day. Comparing the results of ECG measurements, pre and post exposure to
sound level above 80 dB, may establish the risk of cardiac disease in different
form of it.
Keywords: pollution, noise, sound pollution, method noninvasive
Cuvinte cheie: poluare sonorǎ, zgomotul profesional, metoda
neinvazivǎ
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24-3 MENTENANŢA PREDICTIVĂ A ANGRENAJELOR MAŞINILOR-UNELTE PRIN ANALIZA VIBRAŢIILOR

PREDICTIVE MAINTENANCE OF GEARING MACHINERY
VIBRATION ANALYSIS TOOLS
This paper presents the implementing maintenance management for
organizing and preparing system of spare parts to optimize repair time.
Planning the activities of repair and minimizing „downtime” of the machine can
be made only through detection of possible defects. The machine tools
reliability and safety increase, they give respectively operating costs decreased
lead to a better total cost. By studying the vibration signal produced by a gear in
a machine tool structure and the change of the signal related to the presence of
defects gear can identify various defects. Defects are localized at the contact
between the mechanical parts, which means changing of geometry and
conditions of power transmission, which results in vibrations and shocks, the
measurements for determining the gear failures occur.
Cuvinte cheie: angrenajele mașinilor unelte, zgomot, vibraţii, eroare de
transmisie, mentenanța predictivă
Keywords: spur gear, noise, gear vibration, transmission error,
predictive maintenance

3 MENTENANŢA PREDICTIVĂ A ANGRENAJELOR MAŞINILOR-UNELTE PRIN ANALIZA VIBRAŢIILOR