Madrigal
发表于 2025-3-26 22:29:11
Resonance Frequency for Pipes Open at One EndIn effect, a stopped pipe is open at the mouth end and stopped at the other. Its resonance frequency has a wavelength that is nominally one-fourth the length of the pipe. Figure 13 shows the relation between the length of the pipe and its resonance frequency.
Trypsin
发表于 2025-3-27 02:27:07
Response Curves Showing Diffraction by 10 Objects of Different ShapeThe data given in Figure 15 show the measured on-axis response of a small loudspeaker placed, as shown, on several objects of the general dimensions indicated. It should be clear that shapes that avoid sharp transitions give a smooth response.
鄙视读作
发表于 2025-3-27 06:28:20
Definition of Critical DistanceFigure 17 is the first of many that will relate direct and reverberant field measurements in large enclosed spaces. The equation that gives the reduction in sound pressure as we move away from a point source is as follows:.We can state this loss in decibels as follows: <Equation>2</Equation>
尽责
发表于 2025-3-27 13:32:03
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certain
发表于 2025-3-27 13:48:53
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RUPT
发表于 2025-3-27 20:51:37
Noise and Vibration from Railroad Traffic,om the desired amount of noise loss. In Figure 16A, S represents a line source, such as a busy freeway, and the barrier is actually a long wall viewed along its end. R represents a target residence where a certain amount of sound attenuation is desired, as compared to the case where there is no barrier.
craving
发表于 2025-3-27 22:14:15
Diffraction of Sound by a Cylinder, a Cube, and a Spheretive pressure level are given for a number of angles of incidence. The plots show the level of the pressure that exists at the front surface. Thus, they give a good indication of the nominal response of a microphone of the same shape.
情感
发表于 2025-3-28 03:57:40
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Collision
发表于 2025-3-28 09:35:54
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使苦恼
发表于 2025-3-28 14:17:10
978-1-4613-5839-8Springer Science+Business Media New York 2002