| 苏建新.引入广义归一化函数带概念研究结构声源的描述[J].声学技术,2006,(4):365~370 |
| 引入广义归一化函数带概念研究结构声源的描述 |
| Characterization of structure-borne sound sources based on the concept of general normalized function band |
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| DOI： |
| 中文关键词: 源描述 归一化函数 带宽 |
| 英文关键词: source characterization normalized function width of band |
| 基金项目:广东省自然科学基金博士科研启动基金资助项目(05300-906) |
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| 中文摘要: |
| 导纳矩阵方法完整精确描述结构声源,但因包含过多元素缺乏实用性。通过引入广义归一化函数带的概念,提出把完整描述结构声源的大量物理量收缩为一对物理量来对声源简化描述。并利用计算机构造虚拟结构的方法获得与平方总力、两种特征功率对应的三条广义归一化函数带。结果表明在源导纳远大于支撑结构导纳的场合平方总力描述声源好过用特征功率和平均点导纳大小一对量描述声源,而在源导纳与支撑结构导纳可比拟的场合,用特征功率和平均点导纳大小这对量远好过平方总力和平均点导纳大小这对量描述声源。工程上可按照精度上的不同要求,对照广义归一化功率带的宽度,做出接受或放弃这种简化方式。 |
| 英文摘要: |
| Mobility method provides a complete and mathematically rigorous way for characterizing structure-borne sound sources,but lacks convenience as it contains too many elements.In this paper,a concept of general normalized function band is proposed,with which a large number of physical parameters for full characterization of structure-borne sound sources are collapsed into two physical parameters.By building a virtual construction,three general normalized function bands corresponding to total square force and two kinds of characteristic power are obtained.When source mobility is greater than that of supporting structure,using total square force is better,while in matched cases using total square force and mean magnitude of source point mobility is poorer.Referring to the width of general normalized function band,decision can be made on accepting or declining the pair physics parameter to simplify characterization of structure-borne sound sources according to the accuracy requirement. |
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