本文關(guān)鍵詞： 傳聲損失 阻抗管 LabVIEW 傳聲器　出處：《合肥工業(yè)大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：冰箱的噪聲是衡量冰箱性能品質(zhì)的重要指標(biāo)之一,冰箱壓縮機(jī)是冰箱的主要噪聲源,對(duì)冰箱整機(jī)噪聲的水平有很大的影響。其中壓縮機(jī)消聲器的消聲性能的好壞直接關(guān)系到壓縮機(jī)噪聲的大小,消聲器的傳聲損失是衡量消聲器消聲性能的重要參數(shù)。因此設(shè)計(jì)一套微型消聲器傳聲損失的測(cè)量系統(tǒng),用來準(zhǔn)確的判定微型消聲器的消聲性能,對(duì)于微型消聲器結(jié)構(gòu)的設(shè)計(jì)與選擇具有十分重要的意義。 本文對(duì)微型消聲器的評(píng)價(jià)指標(biāo)以及測(cè)量方法進(jìn)行分析研究,總結(jié)出消聲器傳聲損失測(cè)量的四種方法,對(duì)其測(cè)量原理和測(cè)試步驟進(jìn)行分析,然后對(duì)四種測(cè)量方法的優(yōu)缺點(diǎn),進(jìn)行總結(jié),歸納出每種方法的適用條件。通過對(duì)比,本文這里采用傳遞矩陣法的原理進(jìn)行測(cè)量。 在硬件方面,本文參照相關(guān)的國家標(biāo)準(zhǔn),結(jié)合實(shí)際的工程應(yīng)用,設(shè)計(jì)了一套阻抗管,能夠適應(yīng)不同頻段消聲器傳聲損失的測(cè)量,并且確定了阻抗管的長(zhǎng)度和壁厚、傳聲器間距及位置、試件套筒、支撐架、揚(yáng)聲器等結(jié)構(gòu)參數(shù)。 在軟件方面,本文以阻抗管中消聲器傳聲損失測(cè)量的傳遞矩陣法為測(cè)量原理,采用LabVIEW軟件,編寫出一套微型消聲器傳聲損失的測(cè)量系統(tǒng),該系統(tǒng)完成了信號(hào)發(fā)生、傳聲器校準(zhǔn)、數(shù)據(jù)采集、數(shù)據(jù)分析與處理以及結(jié)果保存等程序模塊的編寫,能夠?qū)崿F(xiàn)傳聲損失準(zhǔn)確且快速的測(cè)量。 本文在寬頻聲源激勵(lì)下,將測(cè)得的傳聲損失結(jié)果和在virtual lab軟件中的仿真結(jié)果進(jìn)行對(duì)比,結(jié)果相差不大,并且在相同頻率段傳聲損失曲線的趨勢(shì)保持一致,說明該系統(tǒng)準(zhǔn)確、有效。 最后對(duì)傳聲損失的測(cè)量誤差進(jìn)行研究,在傳聲器間距不同的條件下,利用該系統(tǒng)測(cè)量,通過對(duì)比,分析討論傳聲器間距對(duì)測(cè)量結(jié)果的影響,同時(shí)討論平均方式、系統(tǒng)頻率分辨率和分析譜線數(shù)對(duì)測(cè)量誤差的影響。
[Abstract]:The noise of the refrigerator is one of the important indexes to measure the performance and quality of the refrigerator. The compressor of the refrigerator is the main noise source of the refrigerator. It has a great influence on the noise level of the whole refrigerator. The noise performance of the compressor muffler is directly related to the noise level of the compressor. The sound transmission loss of the muffler is an important parameter to measure the noise performance of the muffler. Therefore, a measuring system for the sound transmission loss of the miniature muffler is designed, which is used to accurately judge the muffling performance of the miniature muffler. It is of great significance for the design and selection of miniature muffler structure. In this paper, the evaluation index and measurement method of miniature muffler are analyzed, and four methods for measuring sound transmission loss of muffler are summarized. The measuring principle and steps are analyzed, and the advantages and disadvantages of the four measuring methods are analyzed. Through comparison, the principle of transfer matrix method is used to measure. In terms of hardware, referring to the relevant national standards and combining with practical engineering applications, a set of impedance tubes is designed, which can be used to measure the sound transmission loss of mufflers in different frequency bands, and the length and wall thickness of the impedance tubes are determined. Microphone spacing and location, test sleeve, support frame, loudspeaker and other structural parameters. In the aspect of software, taking the transfer matrix method of acoustic loss measurement of muffler in impedance tube as the measuring principle, using LabVIEW software, a set of measurement system of sound transmission loss of miniature muffler has been compiled, and the system has completed the signal generation. The program modules, such as microphone calibration, data acquisition, data analysis and processing, and result preservation, can realize accurate and fast measurement of sound transmission loss. In this paper, under the excitation of wide-band sound source, the result of sound transmission loss measured is compared with the result of simulation in virtual lab software. The result is not different, and the trend of sound loss curve in the same frequency band is consistent, which shows that the system is accurate. Effective. Finally, the measurement error of sound transmission loss is studied. Under the condition of different microphone spacing, the influence of microphone spacing on the measurement results is analyzed and discussed by using the system, and the average method is discussed at the same time. The influence of system frequency resolution and the number of spectral lines on the measurement error.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TB535.2

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