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Research on the Rotary Subwoofer Infrasound Generator

Author: ZhangBing
Tutor: ZengXinWu
School: National University of Defense Science and Technology
Course: Acoustics
Keywords: Rotary Subwoofer Ring Piston Numerical Simulation Experiment Blade Rotate Speed
CLC: TB51
Type: Master's thesis
Year: 2011
Downloads: 49
Quote: 0
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Abstract


This thesis is mainly concentrated on the numerical simulation and experimental study of the rotary subwoofer infrasonic generator. The whole works might be divided as below:(1) Based on ring piston radiation mechanism, an approximately mathematical model of rotary subwoofer is established. The sound pressure distribution in the near field is calculated by the Rayleigh theory. The theoretical results agree well with the experimental results within the ratio of rotate frequency to swing frequency f / ? ? 2.(2)Based on the FLUENT, A meshing model for the rotary subwoofer is built first, and then the infrasonic radiation for different blade’s movement situation is numerically simulated. The relationship among the rotate speed, the blade swing angle and the infrasonic radiation intensity is then obtained, which can provide theoretical support for the design and improvement of the rotary subwoofer.(3)A rotary subwoofer is successfully designed and manufactured based on the theoretical and numerical simulation results . The designation of the rotary subwoofer was verified by the experiment for its rationality and validity. The sound frequencies and sound pressure level were measured for different parameters. At last, take SPL as the target, we investigated experimentally the influence of rotate speed, blade speed and blade size on the sound radiation quality of the rotary subwoofer.

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CLC: > Industrial Technology > General industrial technology > Acoustic engineering > Acoustic instruments
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