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工程力学  2013 

开孔双空腔结构风致内压动力特性的研究

DOI: 10.6052/j.issn.1000-4750.2012.08.0596, PP. 154-159

Keywords: 开孔双腔结构,风洞试验,风致内压响应,共振频率,等效阻尼比

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Abstract:

该文推导了开孔双空腔结构内压动力响应的方程组,得到了共振频率和等效阻尼比。对不同空腔开孔面积比和内部容积比下模型各空腔的内压动力响应进行了风洞试验。研究结果表明:两空腔结构模型进行风洞试验时空腔的内部容积,应按照原型和实验风速比平方的关系进行调整以准确模拟原型的内压脉动。含有外墙开孔的空腔(前腔)内压脉动均方根小于不含外墙开孔的空腔(后腔)。内外压均方根比会随着空腔开孔面积比的增加而增大。另外,空腔开孔面积比的增加还会导致系统共振频率升高,等效阻尼比降低。而空腔容积比的增加会使一阶共振频率升高,二阶共振频率降低,并趋向单一空腔时的Helmholtz频率。

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