摘要
机器透过安装点进入到支撑结构的总功率是反映结构噪声的重要物理量。导纳方法提供正确预测该值的途径,但这种方法涉及到太多的物理量,缺乏实用性。寻找简便的近似预测方法有着重要的意义。本文以特征值理论为基础,针对楼宇设备工程中源导纳远大于地板导纳的场合,给出简便的近似预测公式。以典型风机为例,将本文的方法与其他的较复杂近似预测方法比较。结果表明,本文所给出的简便方法与精确值的误差约为4dB,比其它近似方法具有更好的预测准确度。
Sound emission from mounting points transmitting into support structures is an important physical parameter in characterization of structure-borne sound. The mobility method provides a complete and mathematically rigorous way for predicting the sound emission value, but is inconvenient as it contains too many elements. From the eigenvalue theory, a simplified method is proposed for building equipment, in which mobilities of structure-borne sound sources are considerably greater than those of the supporting structure. With two typical fans as an example, sound power predicted using proposed method is compared with that predicted with other approximate methods. Results show that the proposed method gives ±4dB error with respect to the precise value, better than other approximate methods.
出处
《声学技术》
CSCD
北大核心
2006年第2期124-128,共5页
Technical Acoustics
基金
广东省自然科学基金博士科研启动基金资助(05300906)
关键词
功率预测
平均特征值
阻塞力
sound emission prediction
mean eigenvalue
block force
