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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Capstone Model C30 Acoustic Emissions PEAK SOUND PRESSURE The Peak Sound Pressure is a maximum instantaneous sound pressure: (a) for a transient or impulsive sound of short duration, or (b) in a specified time interval for a sound of long duration. PERIOD The duration of time it takes for a periodic waveform (like a sine wave) to repeat itself. PHASE For a particular value of the independent variable, the fractional part of a period through which the independent variable has advanced, measured from an arbitrary reference. PHON Phon is the unit of measurement for loudness level. Phons = 40 + 10 log2 (sone). PITCH Pitch is a listener's perception of the frequency of a pure tone, wherein the higher the frequency, the higher the pitch. PURE TONE Pure Tone is a sound wave whose waveform is that of a sine wave. RANDOM NOISE Random Noise is an oscillation, whose instantaneous magnitude is not specified for any given instant of time. It can be described in a statistical sense by probability distribution functions giving the fraction 3 of the total time that the magnitude of the noise lies within a specified range. RATE OF DECAY Rate of Decay is the time rate at which the sound pressure level (or other stated characteristic, such as a vibration level) decreases at a given point and at a given time after the source is turned off. The commonly used unit is decibels per second. REFRACTION The bending of a sound wave from its original path, either because it is passing from one medium to another, or because (in air) of a temperature or wind gradient in the medium. RESIDUAL NOISE LEVEL The term "residual noise" has been adopted to mean the noise that exists at a point as a result of the combination of many distant sources, individually indistinguishable. In statistical terms, it is the level that exists 90 percent of the time. (Typically, it means the same level customarily applied the term "ambient."). Refer to background noise. RESONANCE The relatively large amplitude of vibration produced when the frequency of some source of sound or vibration "matches" or synchronizes with the natural frequency of vibration of some object, component, or system. RESONATOR A Resonator is a device that resounds or vibrates in sympathy with some source of sound or vibration. 410025-001 Rev A (September 2002) Page 33 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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