广西大学学报(自然科学版)
廣西大學學報(自然科學版)
엄서대학학보(자연과학판)
Journal of Guangxi University (Natural Science Edition)
2015年
5期
1162-1168
,共7页
噪声控制%微穿孔板%机械阻抗%吸声系数%低频吸声
譟聲控製%微穿孔闆%機械阻抗%吸聲繫數%低頻吸聲
조성공제%미천공판%궤계조항%흡성계수%저빈흡성
noise control%micro perforated panel%mechanical impedance%absorption coefficient%sound absorption in low frequency
机械阻抗板( MIP)与微穿孔板( MPP)结合形成微穿孔板组合结构,提高了传统微穿孔板的低频吸声性能,为了获得更好的吸声效果,研究机械阻抗对组合结构吸声的影响。计算找出影响机械阻抗板吸声性能的主要因素,得到机械阻抗板的面积和质量对吸声特性的影响规律:在阻抗板材质厚度及粘弹性材料不变的情况下,增加阻抗板面积,吸声带宽变窄,共振频率向低频移动;在阻抗板材质面积及粘弹性材料不变的情况下,减小阻抗板质量,吸声带宽增加,共振频率向高频移动。在工程实际应用中要保证吸收特定频率的噪声,当阻抗板直径从100 mm增加到200 mm的时候,板厚需要从1 mm减小到0.5 mm,板的固有频率从320 Hz回到380 Hz;当阻抗板直径增加到400 mm,而板厚不能减小的情况下,需要通过提高粘弹性材料的弹性来达到应用效果。
機械阻抗闆( MIP)與微穿孔闆( MPP)結閤形成微穿孔闆組閤結構,提高瞭傳統微穿孔闆的低頻吸聲性能,為瞭穫得更好的吸聲效果,研究機械阻抗對組閤結構吸聲的影響。計算找齣影響機械阻抗闆吸聲性能的主要因素,得到機械阻抗闆的麵積和質量對吸聲特性的影響規律:在阻抗闆材質厚度及粘彈性材料不變的情況下,增加阻抗闆麵積,吸聲帶寬變窄,共振頻率嚮低頻移動;在阻抗闆材質麵積及粘彈性材料不變的情況下,減小阻抗闆質量,吸聲帶寬增加,共振頻率嚮高頻移動。在工程實際應用中要保證吸收特定頻率的譟聲,噹阻抗闆直徑從100 mm增加到200 mm的時候,闆厚需要從1 mm減小到0.5 mm,闆的固有頻率從320 Hz迴到380 Hz;噹阻抗闆直徑增加到400 mm,而闆厚不能減小的情況下,需要通過提高粘彈性材料的彈性來達到應用效果。
궤계조항판( MIP)여미천공판( MPP)결합형성미천공판조합결구,제고료전통미천공판적저빈흡성성능,위료획득경호적흡성효과,연구궤계조항대조합결구흡성적영향。계산조출영향궤계조항판흡성성능적주요인소,득도궤계조항판적면적화질량대흡성특성적영향규률:재조항판재질후도급점탄성재료불변적정황하,증가조항판면적,흡성대관변착,공진빈솔향저빈이동;재조항판재질면적급점탄성재료불변적정황하,감소조항판질량,흡성대관증가,공진빈솔향고빈이동。재공정실제응용중요보증흡수특정빈솔적조성,당조항판직경종100 mm증가도200 mm적시후,판후수요종1 mm감소도0.5 mm,판적고유빈솔종320 Hz회도380 Hz;당조항판직경증가도400 mm,이판후불능감소적정황하,수요통과제고점탄성재료적탄성래체도응용효과。
The composite structure made up of mechanical impedance plate ( MIP) and micro perfo-rated panel ( MPP) improves the sound absorption performance in low frequency compared to the traditional MPP. In order to have better sound absorption, the influence of MIP on the composite structure is studied. The principal influencing factors of MIP sound absorption is confirmed by calcu-lation. Influences of the area and weight of MIP is researched. Under the condition that the material of MIP and the viscoelastic material are determined, increasing the area, the sound absorption peak in low frequency will be more narrow and the sound absorption curves moved to the low frequency. If the area and the viscoelastic material are determined, reducing the weight of MIP, broaden sound absorption peak will be formed and the sound absorption corves moved to the high frequency. In en-gineering practice, in order to absorb fixed noise, it needs reducing the thickness of MIP from 1 mm to 0. 5 mm while increasing the diameter from 100 mm to 200 mm, then the natural frequencies of MIP back from 320 Hz to 380 Hz. As the diameter of MIP increased to 400 mm and the thickness can not be reduced, increasing the elastic of the viscoelastic material will be worked in practical ap-plication.