建筑聲學吸聲材料及原理_新聞中心_焦作新航道環?？萍加邢薰?/title> <meta content="" name="keywords" /> <meta content="吸聲材料顧名思義，就是吸收聲能的材料，吸聲材料：吸聲材料按照其作用機理可以分為多孔性吸聲材料，共振吸聲材料（結構）（1）、多孔性吸聲材料：多孔性吸聲材料的內部有許多微小的細孔直通材料表面，或其內部有許多相互貫通的氣泡。當聲波進入這些細孔后引起這些細孔中的空氣柱振動，空氣柱與孔壁產生摩擦，從而使聲能轉化為內能，到達吸聲的效果。在評價吸聲材料吸聲性能時一般使用吸聲系數的概念，用α表示。多孔性吸聲材料一" name="description" /> <link rel="canonical" href="http://m.martialartslv.com/"/> <meta name="applicable-device" content="pc,mobile"> <meta name="MobileOptimized" content="width"/> <meta name="HandheldFriendly" content="true"/> <script src="/js/m.js" type="text/javascript"></script> <script type="text/javascript" src="/js/jquery.min.js"></script> <script type="text/javascript" src="/js/slick.js"></script> <link rel="stylesheet" type="text/css" href="/css/xhd.css" /> <meta http-equiv="Cache-Control" content="no-transform" /> <meta http-equiv="Cache-Control" content="no-siteapp" /> </head> <body> <div style="position:fixed;left:-9000px;top:-9000px;"><sup id="qi6wi"></sup><button 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url:"/index.php?s=api&c=module&siteid=1&app=news&m=hits&id=64", dataType: "jsonp", success: function(data){ if (data.code) { $(".dr_show_hits_64").html(data.msg); } else { dr_tips(0, data.msg); } } }); </script></span></span> <span>發表時間：2022-03-09</span> </p> </div> <i></i> <p class="label"> </p> </div> <div class="con" id="wjc"> <p>吸聲材料顧名思義，就是吸收聲能的材料，吸聲材料：吸聲材料按照其作用機理可以分為多孔性吸聲材料，共振吸聲材料（結構）</p><p>（1）、多孔性吸聲材料：多孔性吸聲材料的內部有許多微小的細孔直通材料表面，或其內部有許多相互貫通的氣泡。當聲波進入這些細孔后引起這些細孔中的空氣柱振動，空氣柱與孔壁產生摩擦，從而使聲能轉化為內能，到達吸聲的效果。在評價吸聲材料吸聲性能時一般使用吸聲系數的概念，用α表示。</p><p><br/></p><p>多孔性吸聲材料一般具有以下幾個條件：</p><p>① 材料內部應有大量的微孔或間隙，而且孔隙應盡量細小且分布均勻。</p><p>② 材料內部的微孔必須是向外敞開的，也就是說必須通到材料的表面，使得聲波能夠從材料表面容易地進入到材料的內部。</p><p>③ 材料內部的微孔一般是相互連通的，而不是封閉的。</p><p id="_img_parent_tmp" style="text-align:center"><img src="http://m.martialartslv.com/udloeda/ueditor/image/202203/1646812255bf184b.jpg" title="1.jpg" alt="1.jpg"/></p><p>影響多孔性吸聲材料吸聲特性的因素：</p><p>① 流阻：空氣質點通過材料空隙時的阻力。且流阻低的材料，低頻吸聲性能較差，而高頻吸聲性能較好；流阻高的材料中低頻吸聲性能有所提高，但高頻吸聲性能會明顯下降。</p><p>② 孔隙率：材料內部空氣體積與材料總體積的比。對于吸聲材料來說，應有較大的孔隙率，一般應在70%以上，多數達到90%。</p><p>③厚度：材料的厚度對其吸聲系能有關鍵性的影響：</p><p>a)當材料較薄時，增加厚度，材料的低頻吸聲性能將有較大的提高，但對于高頻的吸聲性能則影響較小，如圖（a）所示；</p><p>b)當厚度增加到一定程度時，再增加材料的厚度，吸聲系數的增加量將逐步減少，如圖（b）所示；</p><p>c)多孔性吸聲材料的第一共振頻率近似于吸聲材料的厚度成反比，即：f_0 d=常數；</p><p>d)密度：單位體積材料的質量一般用K來表示。在常用的多孔性吸聲材料中，達到其最佳吸聲性能時的密度：超細棉的密度為10~20K，玻璃棉板的密度為40~60K，巖棉密度的密度為150~200K。</p><p id="_img_parent_tmp" style="text-align:center"><br/></p><p>（2）、共振吸聲材料（結構）：當吸聲結構的固有頻率與聲波的頻率一致時，由于共振作用，聲波激發吸聲結構產生振動，并使其振幅達到最大，從而消耗聲能量，達到吸聲的效果。</p><p>共振吸聲材料和結構主要有薄板共振結構、亥姆霍茲共振吸聲器、穿孔吸聲結構等。</p><p>① 薄板共振吸聲結構：在實際工程應用當中，將具有一定厚度的剛性板固定在龍骨上，讓其與裝飾部位形成一個封閉的腔體，如圖所示。當聲波的頻率與薄板的頻率一致時，薄板在聲壓交變的壓力下產生振動，從而消耗聲能，達到吸聲的目的。</p><p>③ 穿孔吸聲板：穿孔共振吸聲板時單個亥姆赫茲共振器的并聯組合。它的吸聲特性取決于板厚、孔徑、板的穿孔率、板后的空腔厚度以及空腔內填充的材料等因素。</p><p>u穿孔共振吸聲結構的吸聲特性與單個共振器相似，在共振頻率附近有一個吸聲峰值，為了增加吸聲頻帶的寬度和吸聲系數，可以在穿孔板后的空腔內填充多孔性吸聲材料，且多孔性吸聲材料應緊貼穿孔板安裝。</p><p>u穿孔吸聲板按其所使用的材料的種類不同可以分為：金屬穿孔吸聲板，木質穿孔吸聲板及穿孔水泥基吸聲板（包括FC板）。</p><p><br/></p> </div> </div> <div class="context clearfix"> <p class="prevNews bot_left">上一篇：<a 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