不同加筋形式对结构声辐射性能的影响

本文基于统计能量法分析了横向加筋板,纵向加筋板,斜加筋板,圆心在板角的圆弧形加筋板,圆心在板中轴的圆弧形加筋板,正交加筋板等六种不同加筋形式板在100Hz至1000Hz内的声辐射特性,研究表明正交加筋板的平均辐射声压级要低于另外五种形式的加筋板.研究了两类改变加强筋间距的横向加筋板的声辐射性能,研究表明对于固定左侧的一根加强筋改变加强筋间距,随着加强筋间距的增大,辐射声压级先增大后减小,而对于板中线为基准改变加强筋间距,对辐射声压级影响不大.最后,本文研究加筋板在主机舱中的实际应用,建立了三种主机舱模型,分析模型的声辐射特性,研究表明复合加筋形式的主机舱辐射声压级最小,相对于无加筋形式,要低4~5dB左右.

Influence of reinforced form on structures sound radiation performance

Based on the statistical energy analysis method, the acoustic radiation characteristics of transverse reinforcement plate, longitudinal stiffened plate, inclined reinforcement plate, the circle in the voids of stiffened plates with circular arc and circle in the plate axial circular stiffened plate are analyzedwithin the 100Hz-1000Hz.The studyshows that the average radiated sound pressure level of mixture of stiffened plate is lower than the other five kind of stiffened plate.And the acoustic radiationcharacteristics of two different transverse reinforcement plate with different spacing of reinforcement are analyzed, the study shows that for a fixed to the left of a reinforcing rib change stiffener spacing, with the increase of stiffener spacing, radiated sound pressure level increases after the firstly decreases, and the center line as a benchmark for plate change stiffener spacing, has little influence on radiated sound pressure level.Finally, the stiffened plates arestudied in the actual application of the main cabin, three kinds of main engine model are created and acoustic radiation characteristics are analyzed acoustic radiation characteristics, the research shows that the radiated sound pressure level ofcomposite reinforcement in the form of the main engine is minimum and lower about 4~5dB, relative to the form of reinforcement.