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Research on Composite Structure of Micro-Perforated Panel and Noise Control of Liquid Cavitation Heater

Author: ChenWenLi
Tutor: YangLiFang
School: Harbin Institute of Technology
Course: Mechanical Design and Theory
Keywords: Micro- perforated plate structure Standing wave tube Liquid Power Heater Noise control Statistical Energy Analysis
CLC: TB535
Type: Master's thesis
Year: 2010
Downloads: 81
Quote: 1
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Abstract


Noise pollution has become a distraction to people to learn, work and life of one of the important issues, so the noise prediction and control more and more attention to all aspects of society. The micro-perforated plate structure is a new type sound absorbing structure in aircraft noise reduction, auto noise reduction, motor noise reduction and building sound absorption and noise reduction, and other fields has been widely used. Statistical energy analysis as an effective high-frequency sound vibration prediction method has been successfully used in the aerospace, marine, automotive and other fields. This paper studies microperforated panel sound absorption properties of the structure; statistical energy analysis of fluid power heater noise prediction and microperforated panel composite sound insulation structure of liquid power heater noise control. First, according to the theory of sound absorption of the micro-perforated plate structure, through simulation to map out microperforated panel sound absorption performance curve, four structural parameters from the three aspects of the resonant frequency, the maximum absorption coefficient and half sound absorption bandwidth sound absorption properties of single-layer micro-perforated plate structure. On the basis of the structure of the single-layer micro-perforated plate, double tandem micro perforated plate structure and sound absorption performance of parallel micro-perforated plate structure. Drawn by the test results of the standing wave tube structure of single-layer micro-perforated plate, the double tandem micro perforated plate structure and parallel micro-perforated plate structure sound absorption performance curve, and simulation of results are consistent; found through experiments ultrafine glass wool in the micro-perforated plate structure of the cavity is filled, you can not play a high-frequency sound absorption performance of ultra-fine glass wool; ultrafine glass wool is placed in front of the micro-perforated plate structure, both play microperforated panel low-frequency sound absorption properties of the structure, but also ensures that the high-frequency sound absorption performance of ultra-fine glass wool. Again, tests and analysis of the noise spectrum of the liquid power heater, determine the heater for the fluid power of the main noise of cavitation noise. Application of Statistical Energy Analysis cavitation generator noise simulation analysis, cavitation generator noise by improving the structure and applied damping control, to predict the effect of the noise reduction control, and noise reduction effect of the validation test. Finally, in order to machine noise control fluid power heater, designed acoustic enclosures. The acoustical enclosure design, including the design of acoustic enclosures, the microperforated panel composite sound insulation structure design, gaps and holes sealed design and vibration isolation design. Statistical energy method to predict the effect of noise control and noise reduction effect of the experimental prototype validation test.

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CLC: > Industrial Technology > General industrial technology > Acoustic engineering > Vibration, noise and its control > Vibration and noise control and its use
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