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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Capstone Model C30 Acoustic Emissions DECIBEL The Decibel (abbreviated "dB") is a measure, on a logarithmic scale, of the magnitude of a particular quantity (such as sound pressure, sound power, intensity) with respect to a standard reference value (0.0002 microbars for sound pressure and 10-12 watts for sound power). FILTER A Filter is a device that transmits certain frequency components of the signal (sound or electrical) incident upon it, and rejects other frequency components of the incident signal. FLOW RESISTANCE The Flow Resistance of a porous material is one of the most important quantities determining the sound absorbing characteristics of the material. Flow resistance is a ratio of the pressure differential across a sample of the porous material to the air velocity through it. FREQUENCY The number of times per second that the sine wave of sound repeats itself, or that the sine wave of a vibrating object repeats itself. Expressed in Hertz (Hz), or in cycles per second. FUNDAMENTAL FREQUENCY The frequency with which a periodic function reproduces itself, sometimes called the first harmonic. Refer to Harmonic. HARMONIC Harmonic is a sinusoidal (pure-tone) component whose frequency is a whole-number multiple of the fundamental frequency of the wave. If a component has a frequency twice that of the fundamental it is called the second harmonic. HERTZ Unit of measurement of frequency, numerically equal to cycles per second. LEVEL Level is the value of a quantity in decibels. The level of an acoustical quantity (sound pressure or sound power), in decibels, is 10 times the logarithm (base 10) of the ratio of the quantity to a reference quantity of the same physical kind. LINE SPECTRUM Line Spectrum is the spectrum of a sound whose components occur at a number of discrete frequencies. LOUDNESS Loudness is the judgment of intensity of a sound by a human being. Loudness depends primarily upon the sound pressure of the stimulus. Over much of the loudness range it takes about a threefold increase in sound pressure (approximately 10 dB) to produce a doubling of loudness. LOUDNESS LEVEL The Loudness Level of a sound, in phone, is numerically equal to the median sound pressure level, in decibels, relative to 0.0002 microbar, of a free progressive wave of frequency 1,000 Hz presented to listeners facing the source, which in a number of trials is judged by the listeners to be equally loud. 410025-001 Rev A (September 2002) Page 31 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
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