PPT-Noise Lecture5-2 Noise Control

AssProf Shatha AJ Ibrahim Environmental Engineering Department College of Engineering University of Al Mustansiriyah 6Provide mufflers silencer the devices can be classified into 2 fundamental groups Absorptive muffler is one whose noise reduction is determined mainly by the presence of fibrous or porous materials which absorb the sound The attenuation produced in dB per meter run of duct depends on α the sound absorption coefficient of the lining material and the ratio of perimeter to cross sectional area of the duct PS. You can often stop noise that disturbs you without involving your council the police or the Environment Protection Authority EPA This brochure outlines steps you can take to prevent noise being an issue for you When noise annoys There are laws that If excessive noise is not reduced to a reasonable level straight away following the issue of an excessive noise direction the noise control officer accompanied by a Police officer may enter the premises and remove whatever is causing the noise or re Enacted 1988 Sections 1 to 3 8 to 12 18 to39 and 41 17 February 1989 N 44 of 1989 Sections 61 4 5 and 6and 40 in relation to items5bii and e 6 8 and 9 of the Schedule 17 August 1989 Section 63 17 November 1989 Section 4 5 131a and cand 2 to 8 For most applications noise and vibration can be controlled using four methods 1 absorption 2 use of barriers and enclosures 3 structural damping and 4 vibration isolation Although there is a certain degree of overlap in these classes each method ma lnput at 1kHz 1mV RMS PreEmphasized FREQUENCY Hz 20 02000 DEVIATION dB 00 020000 040000 060000 100 1k 10k 50k 04000 06000 08000 1000 080000 10000 18V 25 25 MEASURED COMPUTER SIMULATED T1115 TA02 INPUT SELECT PER PHOTO CART RIDGE COM IN 475k MM 100 Emily Dickinson Lecture. 15. th. Nov 2011. Alison Aitken. The saddest noise, the sweetest noise,. The maddest noise that grows,. The birds, they make it in the spring, . At night’s delicious close. Sound pressure is measured in a unit called decibels and is often abbreviated . dB.. Zero decibels is the lowest sound a person can hear. . A pin drop is . 10 dB . A shower is . 70 dB . A squeeze toy is . Michael Kraft. Reuben Wilcock. Bader Almutairi. Fang . Chen. Pejwaak . Salimi. Overview. Background and Context. Accelerometer Control Systems. High Order Single Loop SDM. MASH SDM Control System. Genetic Algorithm Design. HEARING CONSERVATION PROGRAM. 1. 28 Jan 2013. Learning Objectives. 1. Define hazardous noise re: military service regulations . 2. State the purposes of noise surveys. 3. Identify noise measurement equipment. ARC 507: ENVIRONMENTAL . CONTROL III (ACOUSTICS AND NOISE CONTROL. ). DEPARTMENT OF ARCHITECTURE. FEDERAL UNIVERSITY OF TECHNOLOGY, . AKURE. .. 1. Summary.. 2. Introduction.. 3. Hierarchy of Control.. 32A new class of competenceCompact BOGE screw compressors have been known for their reliability in production for many years The revolutionized and expanded C-2 series lives up to this reputation more 1. PPT-017-03. Bureau of Workers’ Compensation . PA Training for Health & Safety (PATHS). 29 CFR 1910.95. Why Hearing Conservation?. It’s the “LAW”. Quality of Life. OLUWADARE,T.. DEPARTMENTS OF COMMUNITY MEDICINE & PUBLIC HEALTH. Introduction . Noise is . unwanted sound. Wrong sound, in the wrong place, at the wrong time.. Noise has become a very important stress factor in recent time.. 1. PPT-017-03. Bureau of Workers’ Compensation . PA Training for Health & Safety (PATHS). 29 CFR 1910.95. Why Hearing Conservation?. It’s the “LAW”. Quality of Life.