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"jsonp", success: function(data){ if (data.code) { $(".dr_show_hits_68").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> 阻性消聲器，又稱吸收式消聲器，利用吸聲材料吸收噪聲。吸聲材料為疏松、多孔結構，聲波進入孔隙引起微小振動，由于摩擦和粘滯阻力，相當一部分聲能轉為熱能后被吸收。<br/></p><p> 吸聲材料大都為疏松或多孔，如玻璃棉、泡沫塑料、礦渣棉、毛氈、石棉絨、吸聲磚、加氣混凝土、木絲板等。主要特點是貫穿材料的許許多多細孔，即所謂開孔結構，有別于大多數隔熱材料的閉孔結構。</p><p style="text-align: center;"><img src="http://m.martialartslv.com/udloeda/ueditor/image/202203/16468163484ddaed.jpg" title="2.jpg" alt="2.jpg"/></p><p> 阻性消聲器對高頻和中頻噪聲的吸聲效果較好，但對低頻噪聲的消聲性能較差，主要用于消除高頻和高中頻為主的噪聲。</p><p> 管式消聲器用于直徑不大于400mm的風管，僅在管壁內周貼上一層吸聲材料，制作簡單，阻力小。</p><p> 片式或格式消聲器直徑較大的風管，增加吸聲材料與聲波的接觸面積，減少中、高頻噪聲的“直通”，以保證消聲效果。</p><p> 抗性消聲器，又稱膨脹性消聲器，由管和小室相連而成，利用風管截面的突變反射噪聲。結構簡單，不使用吸聲材料，因而不受高溫和腐蝕性氣體的影響。</p><p> 抗性消聲器對低頻和中頻噪聲有較好的消聲效果，主要用于消除低頻和低中頻為主的噪聲。</p><p> 為了保證一定的消聲效果，消聲器的膨脹比（大、小斷面積之比）應大于4，因此在機房等空間較小場合的應用受到限制。</p><p style="text-align: center;"><img src="http://m.martialartslv.com/udloeda/ueditor/image/202203/1646816348fbe008.jpg" title="1.jpg" alt="1.jpg"/></p><p> 共振消聲器，利用管道開孔與共振腔相連通，穿孔處與空腔內的空氣構成彈性共振系統，外界噪聲與之同頻時產生共振，在穿孔處與孔壁摩擦而消耗聲能。</p><p> 共振消聲器屬抗性的范疇，具有較強的頻率選擇性，即有效的頻率范圍很窄，主要用于消除低頻噪聲，或中頻窄帶噪聲或噪聲峰值。阻力小，不需要吸聲材料，但因有共振腔而使結構偏大。</p><p> 共振消聲器的穿孔板孔徑縮小到≤1mm時，就成為微穿孔板消聲器。結構簡單，不需要吸聲材料，特別適用于有高溫、潮濕及潔凈要求的管路系統消聲。</p><p> 阻抗復合式消聲器，兼具阻性和抗性消聲器的優點，對低頻到高頻噪聲均有良好的消聲效果。1.2m長的復合型消聲器的低頻消聲量可達10~20dB。</p><p><br/></p> </div> </div> <div class="context clearfix"> <p class="prevNews bot_left">上一篇：<a href="http://m.martialartslv.com/xwzx/2022030967.html">聲學意義上的大房間與小房間 </a></p> <p class="NextNews bot_right">下一篇：<a href="http://m.martialartslv.com/xwzx/2022030969.html">消聲器種類及選用與設置</a></p> </div> </div> <div class="mub02xgyd"> <div class="top mub02Top"> <h2>推薦閱讀</h2> </div> <div class="conBox"> <ul class="clearfix"> <li><a href="http://m.martialartslv.com/xwzx/2022030970.html" title="陣列式消聲器">陣列式消聲器</a> <span>2022-03-09</span></li> <li><a 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