PDF Publication Title:
Text from PDF Page: 076
Example problem: You are standing 50.0 m away from a jet engine where the SIL is measured at 130. dB. What is the power of the sound at that distance? Solution: SIL=10.0log I 10Iref Substituting values gives 130. dB = 10.0log I 10 1×10−12 Noise 13.0 dB = log10 I − log10 10−12 13.0 dB = log10 I − (−12.0) 1.00 dB = log10 I I = 10.0 W/m2 Since P = IA or P = I (4πr2) then P = (10.0)(4)(3.14)(50.0)2 P = 314,000 W PROBLEMS 1. Given a sound intensity of 3.143105 W/m2, what would the SIL be at a distance of 8050 m (5.00 mi)? 2. How far away would you need to be from a sound source with 2.503105 W of power in order to have the SIL be 75.0 dB? 3. An airplane baggage loader shouts to a coworker to try to be heard over engine noise. If the sound he produces has 3.10310–3 W power and the coworker is 5.00 m away, what is the sound intensity when it reaches the coworker? 4. How close to your coworker would you need to be to be able to shout above the whine of a jet if its SIL was 110. dB? 5. If the fan in a scale model engine rotates at 12,657 rpm and if it has 22 blades, what is the BPF? 6. Wavelength is related to frequency by the equation λ = c/ν. What is the wavelength of a tone from a BPF of 4640 cycles per second (4640 hertz, or Hz)? 68PDF Image | NASA Guide to Engines
PDF Search Title:
NASA Guide to EnginesOriginal File Name Searched:
nasa-guide-to-engines.pdfDIY PDF Search: Google It | Yahoo | Bing
NFT (Non Fungible Token): Buy our tech, design, development or system NFT and become part of our tech NFT network... More Info
IT XR Project Redstone NFT Available for Sale: NFT for high tech turbine design with one part 3D printed counter-rotating energy turbine. Be part of the future with this NFT. Can be bought and sold but only one design NFT exists. Royalties go to the developer (Infinity) to keep enhancing design and applications... More Info
Infinity Turbine IT XR Project Redstone Design: NFT for sale... NFT for high tech turbine design with one part 3D printed counter-rotating energy turbine. Includes all rights to this turbine design, including license for Fluid Handling Block I and II for the turbine assembly and housing. The NFT includes the blueprints (cad/cam), revenue streams, and all future development of the IT XR Project Redstone... More Info
Infinity Turbine ROT Radial Outflow Turbine 24 Design and Worldwide Rights: NFT for sale... NFT for the ROT 24 energy turbine. Be part of the future with this NFT. This design can be bought and sold but only one design NFT exists. You may manufacture the unit, or get the revenues from its sale from Infinity Turbine. Royalties go to the developer (Infinity) to keep enhancing design and applications... More Info
Infinity Supercritical CO2 10 Liter Extractor Design and Worldwide Rights: The Infinity Supercritical 10L CO2 extractor is for botanical oil extraction, which is rich in terpenes and can produce shelf ready full spectrum oil. With over 5 years of development, this industry leader mature extractor machine has been sold since 2015 and is part of many profitable businesses. The process can also be used for electrowinning, e-waste recycling, and lithium battery recycling, gold mining electronic wastes, precious metals. CO2 can also be used in a reverse fuel cell with nafion to make a gas-to-liquids fuel, such as methanol, ethanol and butanol or ethylene. Supercritical CO2 has also been used for treating nafion to make it more effective catalyst. This NFT is for the purchase of worldwide rights which includes the design. More Info
NFT (Non Fungible Token): Buy our tech, design, development or system NFT and become part of our tech NFT network... More Info
Infinity Turbine Products: Special for this month, any plans are $10,000 for complete Cad/Cam blueprints. License is for one build. Try before you buy a production license. May pay by Bitcoin or other Crypto. Products Page... More Info
| CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com | RSS | AMP |