noise control Articles

Conveyor belts, the ubiquitous pulley operated machines found in assembly lines, baggage checkouts, freight loading and unloading vehicles, escalators, and ski carriages, require a lot of maintenance. These machines must be in top condition for optimal performance and safety.  Much of the damage to conveyor belts can be attributed to deposits ...

The recent reports in the press about insurance groups complaining of a sharp rise in claims from employees seeking compensation for hearing problems have highlighted the real risks of noise induced hearing loss and the importance of protecting employees in the workplace. Although employees are protected by Law, noise induced hearing loss is ...

Knowing what’s happening inside a fuel cell is a critical function, especially as fuel cells are continuing to be developed. One important aspect of this is to measure the voltageof each cell in a stack. Although this may sound trivial, it can be more complex and more expensive than it may at first appear due to high voltages, high ...

Problem: an extract system fan drone creating a potential environmental noise problem. Solution: aerodynamic engineering instead of silencers – in keeping with the Red Bull Technology ethos. The conventional technique used to reduce fan tones like this is a silencer – a large, palliative silencer that doesn’t tackle the source ...

The program window is a XY-plane (parallel to the land surface). A noise source is represented by a small square. In the Status bar at the bottom, we have X and Y coordinate values in meters and data on our environmental system. Point the mouse where you want in the program window and the X and Y values will be shown in the status bar at the ...

Due to the features of the software that allows to simulate the process of noise pollution immediately, the numeric simulation is carried out with a remarkable speed. You create the graphical interface for your pollutant sources by drawing point sources in a graphical way. You create the simulation process by drawing point sources on the CUSTIC ...

4.1 CUSTIC Software 3.2 Before you attempt to install and use the program, make sure your personal computer meets the hardware and software requirements shown in the following table.   System requirements: Windows 95, 98, 2000 and XP CD-ROM drive RAM Memory: 16MB or higher   Canarina CUSTIC software · production of ...

4.3 Starting CUSTIC Click Start, go to Programs, and choose CUSTIC 3.2. Here is the program window after start up. The window has a Menu bar at the top, a Status bar at the bottom and a basic tool bar in the window. The program commands are available through the menus and toolbar buttons. Some commands have associated dialog boxes which you can ...

The intensity of two sounds L1 and L2 can be added in decibels with the standard equation: LdB=10 log[(p1/p0)2+[(p2/p0)2] and then, LdB=10 log[10L1/10+ 10L2/10] In this way, decibels from two different sources can be added.  CUSTIC Software will consider this method of calculation.   ...

References U.S. Department of Transportation Federal Highway Administration (1976) A Guide to Visual Quality in Noise Barrier Design. California Department of Transportation (1997) Technical Noise Supplement 1st Draft. Benz Kotzen and Colin English (1998) Environmental Noise Barriers: A Guide to their Acoustic and Visual Design,E & FN ...