阀门气动噪声的振声转化计算方法

A vibration-to-sound conversion method for prediction of valves aerodynamic noise

采用振动与噪声转化的方法计算气体流经阀门产生的管内气动噪声。通过推导管壁振动与管内噪声的计算公式,建立了管壁振动加速度级与管内噪声级之间的转换损失数理模型,并在低频区域,通过修正的频率因子,扩展了转换损失适用的频率范围,实现了通过阀门管内气动噪声的无损伤预测。利用实验对计算模型和方法进行了验证,结果表明,预测总声级的最大误差为0.98%,在整个频域内大约有69.3%-78.3%的数据预测误差在±5 dB以内,因而具有较高的精度,为阀门气动噪声的计算和分析提供了新的方法。

A vibration-to-sound conversion method （VSCM） used for predicting aerodynamic valve noise is proposed. To facilitate the difficulties for conversion the pipewall vibration, the conversion loss model is established to quantify relationship between the pipe internal sound pressure level and pipewall acceleration level. And the improved frequency factors is used in the low frequency range to extend the the application frequency range of the conversion loss model. Then, an experimental validation was carried out. Compared with experimental data, 69.3% 78.3% of all calculated values for internal sound pressure level lay within the error bands between minus five dB and five dB. Furthermore, the maximum difference between the calculated and measured total internal sound pressure level is 0.98%. It is concluded that the present approach should give reliable estimates of valve noise in practical situations