冲击板边界条件对材料辨识的影响

Effect of the Boundary Condition Variation on the Material Identification of Impacted Plate

针对声源辨识中声源物理属性的相互影响问题,研究了边界条件可变情况下冲击阻尼板的材料辨识。利用球-板撞击物理模型进行声音合成,完成了两组主观评价实验。实验1对不同边界条件和不同材料板的冲击声进行不相似评价,通过多维尺度分析研究了人耳对材料和边界条件的感知。实验2对板材料连续变化的声音集合进行材料辨识,分析了不同边界条件下听者对阻尼的利用能力。结果表明:听者具有利用不同边界条件下板的冲击声进行材料辨识的能力,但辨识结果的优劣与所采用的主观评价实验方法有较大关系,不同边界条件下听者对阻尼的利用能力也相同。

The material identification of impacted plate with varied boundary condition is studied. Two subjective e valuation experiments are designed, in which sounds are synthesized using a physical model of ballplate collisions. Dissimilarity evaluation of sounds coming from impacted plate with different material and boundary condition are ob tained in the first experiment, and perceptual space characteristics of sounds are inferred from multidimensional scaling of dissimilarity rating. In the second experiment, the material identification of sound sets which are synthe sized with gradually varied material properties of plates are carried out, and we measured listeners＇ ability to exploit damping under different boundary conditions. The results showed that listeners have the ability to identify material by using sounds coming from different boundary conditions, and identification results have great relations with sub jective evaluation experimental methods and listeners＇ ability to exploit damping varied with boundary conditions.