نتایج جستجو برای: sound pressure level
تعداد نتایج: 1531055 فیلتر نتایج به سال:
Introduction: Noise is one of the most important pollutants in worksites. Hospitals are imposed to noise pollution. Considering lack of research in Sari educational hospitals and applicability of noise control by engineering controls and education, we proposed this research to evaluate the sound pressure level (SPL) in three educational hospitals of Sari, Iran. Methods: In a descriptive-analy...
Introduction: Continuous exposure to physical hazards above the recommended standard in hospital work environments can affect the health of employees. The purpose of this study is to evaluate and describe the physical harmful factors of the work environment in different departments of Shahid Shukri Dental Hospital in Tehran. Methods and Materials: The current research was designed and implemen...
Noise could occur anywhere in the aerospace and other fields has a great influence on operation of aircraft. The control sound emission attracted lot attention from economic environmental aspects. Firstly, noise is annoying for passengers pilot may increase risk to be exposed military applications. Secondly, pose damage threat engine equipment due strong pressure oscillation. In addition, combu...
Exhaust Noise Reduction by Application of Expanded Collecting System in Pneumatic Tools and Machines
In this paper, we demonstrate how to reduce the noise level of expanded air from pneumatic tools. Instead a muffler, propose collecting system, where expands through tube and expansion collector. We have elaborated mathematical model which illustrates dynamics flow, as well acoustic pressure at end tube. The computational results were compared with experimental data check sound pressure. Moreov...
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