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            <div   id="fffzrt3"   class="date-wrap"> <span id="xldpnfb"    class="date"> 26 </span> <span id="bl1dnft"    class="month"> 2020-10 </span> </div>
            <div   id="rvxnl1p"   class="author"> By <a href="javascript:;"> <a href='mailto:'>���岩声学</a> </a> </div>
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            <h1><i class="fa fa-envira"></i>吔R��的原理是什�?/h1><hr style="margin-bottom:30px">
            <p><span style="font-size: 14px;">声音�q�入多孔材料或引起可弯曲变�Ş的板振动后，声能转化为热能的效应。声波在�I�气中传播与�I�气质点因振动摩擦��声能转化为热能，引�v的声波随传播距离增加逐渐衰减的现象，�U�Cؓ�I�气吸收�Q�当声�L入射多孔吸声材料�Ӟ���׃���I�气的粘滞阻力，�I�气与孔壁的振动摩擦�Q���相当一部分声能转化成热能而被吸收�Q�称为材料吸声�?/span></p>
<p><span style="font-size: 14px;">&nbsp;��M��材料对入���声能或多或���都有一些吸声能力，�q�_��吸声�p�L�����过0.2的材料才�U�Cؓ</span><span style="font-size: 14px;">吸声材料</span><span style="font-size: 14px;">。多孔吸声材料吸声频率的�Ҏ��是:中高频吸声系数较大，低频吸声�p�L��较小�?/span></p>
<div label-module="para"><span style="font-size: 14px;">声�L通过</span><span style="font-size: 14px;">媒质</span><span style="font-size: 14px;">或遇到物质表面时�Q�声能降低的�q�程。吸音一般用</span><span style="font-size: 14px;">吸声�p�L��</span><span style="font-size: 14px;">来表征，���试材料吔R��的方法有混响室法和声��L�����法。前者多用于工程上，后者多用于实验室测试研�I�。通过</span><span style="font-size: 14px;">混响�?/span><span style="font-size: 14px;">���出的吸声系数a5�Q�式中，V为�؜响室体积�Q�m3�Q�S�����样面�U�，m2�Q�C为空气中</span><span style="font-size: 14px;">声�?/span><span style="font-size: 14px;">�Q�m/s�Q�T60-1�Q�T60-2分别为空室和攑օ�试样后�؜响室的�؜响时间�?/span></div>            <ul class="pager">
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