作　　者： ; ; ;

机构地区： 大连交通大学交通运输工程学院

出　　处： 《大连交通大学学报》 2010年第4期101-104,108,共5页

摘　　要： 建立了双层铝合金型材与声场高频振动的统计能量分析(statistical energy analysis-SEA)模型,以动力学力激励作为系统的能量输入,计算了铝合金型材和声场的动力学响应,比较了不同板厚度、位置对振动速度和对声场声压级的影响,计算表明靠近载荷的子系统具有更大的振动速度,板越薄振动速度越大,声场声压级越高,板厚度每减小0.5 mm声场声压级增加约1 dB.研究结果表明,统计能量法可有效计算铝合金型材的高频振动噪声,研究对基于统计能量的整车高频声振分析有重要意义. A model of statistical energy analysis（SEA） is build for the aluminum alloy extrusions of vehide body with acoustic field in middle and high frequency range.The structure is stimulated by dynamic force to calculate dynamic response,and the vibration velocities and input energy injected into the acoustic field are compared with various plates.An example shows that the plates near the load have a higher vibration velocity,resulted in more injected energy into the acoustic field,and the sound pressure level（SPL） of the acoustic field and the vibration velocity of the plate are increased when the plate becomes thinner.A 0.5mm decrease of the plate thickness results in 1dB addition of SPL,and a 0.001m/s rise of vibration velocity.The results shows that the SEA is an effective method for vibration and noise analysis of the aluminum alloy extrusions to reduce vibration and noise of the rail vehicle.

关 键 词： 统计能量 中空挤压铝型材 声场 声压级 振动速度

领　　域： [理学] [理学] [一般工业技术]