复合自由度波导抑振器的振动声辐射模态

针对附连在无限大障板上的复合自由度波导抑振器(Combined DOF Waveguide Suppressor),用等效的Timoshenko梁理论描述了它的自由振动并确定了该问题的精确解.基于声辐射模态理论研究了波导抑振器声能量辐射和声场中声能量传递的性质;给出了用声强形式表示的声能量辐射模式和声能量传递模式.结果表明,表面声强和空间声强可以分成两部分,一部分将辐射的能量传递到远场;另一部分表现为抑振器本身与外部流场之间能量的交换.

The Acoustic Radiation Modes Induced by Vibration of Combined DOF Waveguide Suppressor

For a combined DOF waveguide suppressor attached to a large baffleplate,this paper obtained the analytical solution to this problem by replacing the combined DOF waveguide suppressor as a simplified effective Timoshenko beam.Based on the theory of acoustic radiation modes,it discussed the properties of(acoustical) energy radiation from combined DOF waveguide suppressor and acoustic energy transfer into outer fluid to indicate the patterns of acoustical energy radiation and transfer with sound intensity.The surface sound intensity and fluid sound intensity may be classified into two parts;one part of the energy can propagate toward far field,while the other part may present the energy exchange between suppressor and outer fluid within near field.