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. 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 Sx Qx Ru with 0 0 Lecture 6 Linear Quadratic Gaussian LQG Control ME233 63 brPage 3br LQ with noise and exactly known states solution via stochastic dynamic programming De64257ne cost to go Sx Qx Ru We look for the optima under control 1 0 n 0 Error between 64257lter output and a desired signal Change the 64257lter parameters according to 1 57525u 1 Normalized LMS Algorithm Modify at time the parameter vector from to 1 ful64257lling the constraint 1 with the least modi6425 01 01 10 20 15 10 5 02 04 06 08 y brPage 4br EE392m Winter 2003 Control Engineering 44 Example Servosystem command More stepper motor flow through a valve motor torque I control Introduce integrator into control Closedloop dynamics gk gk gk 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 Ye Zhao. , . Zhi. Yuan and Fan Chen. Kent State University, Ohio, USA. Turbulent Fluid. “Turbulence is an irregular motion which in general makes its appearance in fluids, gaseous or liquid”. Taylor and von . 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. UCOP Safety Meeting . March 2010. Developed by Karen Hsi, UCOP EH&S Student Intern. Noise and Acoustics. Noise and Acoustics. Hazardous noise exposures occur. On the job…. And off the job…. Measuring Noise. The saddest noise, the sweetest noise 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, 1Axiomaticversusconstructiveproceduresinmathematics,TheMathematicalIntelligencer7(4)(1985),10-17.2ParmenidesofElea,early5thcenturyB.C.,wasanancientGreekphilosopherborninElea,aGreekcityonthesoutherncoa iiUNIVERSITY OF PITTSBURGH SCHOOL OF ENGINEERING This dissertation was presented by Deyu Li It was defended on July 16 2003 and approved by Dr William W Clark Associate Professor 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.. produced by different activities. Stay safe.   . Whether you are a scientist researching a new medicine or an engineer solving climate change, safety always comes first. An adult must always be around and supervising when doing this activity. You are responsible for:. 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.