基于统计能量分析的簇绒地毯织机高频噪声抑制

为有效抑制簇绒地毯织机高频噪声,提出了基于统计能量分析(SEA)的簇绒地毯织机高频噪声降噪方法,并运用三聚氰胺多孔吸声材料实现了高频噪声的抑制。首先建立了包含13个结构子系统和10个声腔的簇绒地毯织机高频噪声SEA模型,随后采用理论计算方法确定了各子系统的模态密度、内损耗因子以及耦合损耗因子。实验测量了簇绒地毯织机工作时振动加速度信号从而获取SEA模型高频噪声声压级,并通过与簇绒地毯织机工作时实际声压级情况对比验证了SEA模型的有效性。最后在簇绒地毯织机表面粘附了不同厚度的三聚氰胺多孔吸声泡沫板实现降噪。结果表明:该方法能够满足工程上对簇绒地毯织机高频噪声抑制的要求,且噪声频率和三聚氰胺多孔吸声材料的厚度均对结果有影响。

Suppression of high frequency noise of tufted carpet loom based on statistical energy analysis

In order to effectively suppress the high frequency noise of tufted carpet loom,a statistical energy analysis(SEA)was proposed,where a melamine porous sound absorption material was used to suppress high frequency noise.In this research,the SEA model of high frequency noise of tufted carpet loom with 13 structural subsystems and 10 acoustic cavities was established,and then the modal density,internal loss factor and coupling loss factor of each subsystem were determined by using a theoretical calculation method.The vibration acceleration signal of tufted carpet loom was measured to obtain the high frequency noise sound pressure level of SEA model.The validity of SEA model was verified by comparing with the actual sound pressure level of tufted carpet loom,before the surface of tufted carpet loom was adhered with different thickness of melamine porous sound absorbing foam board to achieve noise reduction.The result shows that the method can meet the engineering requirements for high frequency noise suppression,and the noise frequency and the thickness of the melamine porous sound-absorbing material have influence on the results.