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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Application Guide: C30 and C60 Hybrid Electric Vehicle (HEV) Application Information for Capstone Acoustical Parameters The system OEM/Integrator is responsible for meeting their specific acoustics requirements for the installation or application. The Capstone noise attenuation design goal that has been established and met is 65 dBA at 10 meters. Noise attenuation efforts are close-coupled to pressure drop, maintenance, inlet heating, and environmental requirements. To achieve lower overall noise requires an understanding of the individual noise sources and then targeting specific reductions for each area. Engineering reference material specific to noise reduction may be found in as noted: • L. L. Beranek and Istvan L. Ver, Noise and Vibration Control Engineering Principles and Applications, John Wiley and Sons Inc., New York, NY 1992. • David A. Bies and Colin H. Hansen, Engineering Noise Control Theory and Practice, Second Edition, Chapman and Hall, New York, NY 1996. (Also published in Japan). Noise levels or sound power is the strength of the noise source (normally measured in decibels or dBA). Notice that sound power does not depend on distance or direction. Typically, the sound pressure levels distributed around the package depend on the strength of the noise sources as well as the acoustic characteristics of the inlet ducting, the exhaust ducting, and the overall packaging environment. The acoustic characteristics include attenuation, directivity, and location. Each package or installation will have its own unique acoustic characteristics, and each potential acoustic pathway should be designed to ensure that target noise levels are met. The four major noise types associated with the MicroTurbine are detailed in the following paragraphs. Turbulence Noise Turbulence noise is widespread, and originates mainly in the air intake area, the combustor chamber, and in the exhaust duct. This type of noise is broadband and occurs typically at frequencies of between 1000 and 5000 Hz. Blade Interaction Noise Blade interaction noise is caused by an interaction of the high speed turbine blades and the compressor blades with specificity at local flow disturbances. This noise is tonal in nature with the strongest occurring at blade passing frequencies. The blade passing frequencies occur at 14,400 Hz for the compressor and at 20,800 Hz for the turbine. Electro-Mechanical Noise Electro-mechanical noise is caused by the magnetic fields within the generator, and is then passed through the stator and the stator housing. This noise is also tonal in nature with the strongest occurring at 1 and 2 times shaft speeds. That places the tonal frequencies at 1600 Hz and 3200 Hz with a shaft speed of 96,000 rpm. 480009-001 Rev B (October 2004) Page 35 of 54 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 | Application Guide Model C30 and C60 HEV Application Information
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