PDF Publication Title:
Text from PDF Page: 029
Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Capstone Model C30 Acoustic Emissions Appendix F: Acoustical Terminology A-WEIGHTED SOUND LEVEL The ear does not respond equally to frequencies, but is less efficient at low and high frequencies than it is at medium or speech range frequencies. Thus, to obtain a single number representing the sound level of a noise containing a wide range of frequencies in a manner representative of the ear's response, it is necessary to reduce the effects of the low and high frequencies, with respect to the medium frequencies. The resultant sound level is said to be A-weighted, and the units are dB. A popular method of indicating the A-weighted units is dBA. The A-weighted sound level is also called the noise level. Sound level meters have an A weighting network for measuring A-weighted sound level. ABSORPTION Absorption is a property of materials that reduces the amount of sound energy reflected. Thus, the introduction of an "absorbent" onto the surfaces of a machine will reduce the sound pressure level by virtue of the fact that sound energy striking the machine surfaces will not be totally reflected. The effect of absorption merely reduces the resultant sound level in the machine produced by energy that has already entered the machine. ABSORPTION COEFFICIENT Absorption Coefficient is a measure of sound-absorbing ability of a surface. This coefficient is defined as the fraction of incident sound energy absorbed or otherwise not reflected by the surface. Unless otherwise specified, a diffuse sound field is assumed. The values of sound- absorption coefficient usually range from about 0.01 for marble slate to almost 1.0 for long absorbing wedges such as are used in anechoic chambers. ACCELEROMETER (ACCELERATION PICKUP) An electro-acoustic transducer, that responds to the acceleration of the surface to which the transducer is attached, and delivers essentially equivalent electric waves. ACOUSTICAL POWER Refer to Sound Power. ACOUSTICS Acoustics is the science of sound; including the generation, transmission, and effects of sound waves, both audible and inaudible. It is also, the physical qualities of an enclosure (such as size, shape, amount of noise) that determine the audibility and perception of sound. AIRBORNE SOUND Airborne sound is sound that reaches the point of interest by propagation through air. AIR FLOW RESISTANCE Refer to Flow Resistance. AMBIENT NOISE LEVEL The Ambient Noise Level follows the usage of the word "ambient" throughout the environmental sciences (except acoustics). That is, the ambient noise level is that level that exists at any instant, regardless of source. 410025-001 Rev A (September 2002) Page 29 of 36 This information is proprietary to Capstone Turbine Corporation. Neither this document nor the information contained herein shall be copied, disclosed to others, or used for any purposes other than the specific purpose for which this document was delivered. Capstone reserves the right to change or modify without notice, the design, the product specifications, and/or the contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction.PDF Image | Guide for Capstone Turbine Model Number
PDF Search Title:
Guide for Capstone Turbine Model NumberOriginal File Name Searched:
410025_C30_Acoustics.pdfDIY PDF Search: Google It | Yahoo | Bing
Capstone Turbine and Microturbine: Capstone microturbines used and new surplus for sale listing More Info
Consulting and Strategy Services: Need help with Capstone Turbine, sizing systems, applications, or renewable energy strategy, we are here to assist More Info
Container Lumber Dry Kiln: Since 1991 developing and innovating dry kilns using standard shipping containers More Info
Supercritical CO2 Lumber Dry Kiln: Compact fast drying in 3 days or less for small amounts of wood and lumber drying More Info
BitCoin Mining: Bitcoin Mining and Cryptocurrency... More Info
Publications: Capstone Turbine publications for microturbine and distributed energy More Info
FileMaker Software for Renewable Energy Developing database software for the renewable energy industry More Info
CO2 Gas to Liquids On-Demand Production Cart Developing a supercritical CO2 to alcohol on-demand production system (via Nafion reverse fuel cell) More Info
Stranded Gas for low cost power Bitcoin Mining Using stranded gas for generators may provide breakthrough low power costs for cryptocurrency miners. More Info
| CONTACT TEL: 608-238-6001 Email: greg@globalmicroturbine.com | RSS | AMP |