柴油机增压器包覆层隔声性能试验分析及优化设计

提出一种船用增压器的包覆层结构,其内层为绝热材料和吸声材料,外层为金属薄片。采用统计能量法(SEA)建立该结构的中高频段隔声数值模型,开展包覆层的隔声试验,隔声量实测值与仿真结果吻合较好,能验证数值建模的有效性。对包覆层的吸声材料的厚度、密度和流阻等参数进行优化设计,利用正交试验法设计数值试验组,采用极差和方差分析法分析影响材料隔声性能的关键因素,得出最重要的影响因素是材料厚度,在选型设计中还应考虑密度和流阻因素。当安装厚度受限时,可通过改变密度和流阻值来提高材料的隔声量。

Analysis and Optimization Design of Sound Insulation Performance of Acoustic Packaging for Diesel Supercharger

Acoustic packaging of diesel supercharger is presented, the inner layer is insulation material and sound absorbing material, the outer layer is metal sheet. Statistical energy method (SEA) was used to establish the middle and high frequency acoustic insulation numerical model of the packaging, and the acoustic insulation test of the packaging was carried out. The results show that the measured values of sound insulation are in good agreement with the simulation results, which verifies the effectiveness of numerical modeling. The sound absorbing parameters of the packaging such as thickness, density and flow resistance were optimized, and the numerical test group was designed by orthogonal test method, and the critical factors influencing the sound insulation performance were analyzed by means of range and variance analysis. The most important factor is material thickness, and density and flow resistance should be considered in the selection design. When the installation thickness is limited, the sound insulation quantity of the material can be improved by changing the density and the flow resistance value.