Measurements of Vibration and Noise Level at Different Cement Companies

Abstract

The aim of this article is to compare Vibration and Noise measurements caused by different types of Machines at cement factories with the standard evaluation criteria of Vibration ISO 2631 – 4 EVS – EN 5349 – 2 and Noise following the standard ISO 9612 – 2009. Two cement companies were chosen, the first is located at Baddish district, 30km west of Mosul city (Iraq), which is called Baddish general cement company, while the other is located south of Mosul, and is called Hammam Al-Alil general cement company. Three stations were chosen for each company (raw materials grinding mills, cement grinding mills, and exhaust fan stations) having different electrical motor capacities. Noise level meter and vibration level meter manufactured by B & K (DENEMARK) were used for measurement. The location of bearing was chosen for vibration measurement, while the location of the operator’s ears for noise measurement, where chosen. It was found that most of the readings in vibration levels were unacceptable according to the evaluation criterion of vibration magnitude and noise level higher than 85dBA due to rotating unbalance misalignment and faulty gear matching (ISO 1940/1, 1990).

Vibro-Acoustic Assessment of Grain Grinding Machine for Health Risk Factors Analysis

“…The computed A-weighted equivalent sound pressure level (LAeq) at each of the grinding operations shops assessed was analyzed on typical noise levels scale international standard organization. Noise level and vibration were evaluated following the ISO 9612:2009 (acoustics -guidelines for noise exposure assessment in a working environment) and ISO 2372 (mechanical vibration and shock -evaluation of human exposure to whole-body vibration) [35], [46]. The categories of the noise intensity on the typical noise levels scale are presented in tables 2 and 3 below.…”

“…A Google search of different databases found no literature that focused on the noise level and whole-body vibration assessment caused by food grinding machines. As well, none compared the power sources for their effects on the vibration and noise level in the work environment Measurement of vibration and noise levels aids in indicating and monitoring the performance of the machine and provides an immediate warning whenever the vibration and noise levels rise above the recommended level for the safety and health of the work environment [35]. Most food grinding machine operators are selfemployed, and like other entrepreneurs, they control their working hours because they not aware of the relevant occupational health and safety standards, predisposing them to higher risks of noise hazards.…”