摘要
为了继续探究木材受力变形后振动性能的变化规律,对以杉木为基材的非约束型制振梁弯曲定型,并应用中央加振的方法测定其声学振动性能。分析了弯曲变形程度与材料的反共振频率、损耗角正切等物理量的变化关系。结果表明:杉木弯曲形变对材料的反共振频率影响较小,而对损耗角正切的影响则有一定程度的增大。损耗角正切与弯曲形变量成比例关系变化,且受拉伸变形的影响程度较大。由制振材料形成的阻尼结构层在弯曲的基材层外侧时的损耗角正切较小,此结构适合于设计和制作低频乐器的弯曲部件。
In order to continue to explore the changing regularity of the vibration performance after the deformation of the wood,we studied the flexural shape of the non-restrained vibration beam with Cryptomeria japonica as the base material,and determined the acoustic vibration performance by central exciting method. We analyzed the relationship between the bending deformation degree and the anti-resonance frequency and the loss tangent of the material. The bending deformation of C. japonica had little influence on the anti-resonance frequency of the material,but increased the loss tangent to a certain extent. The loss tangent was proportional to the flexural variable,and the influence of the tensile deformation was much higher. The damping structural layer formed by the vibration damping materials was less on the outside of the curved base material layer,and this structure was suitable for designing and making the bending parts of the low-frequency instruments.
作者
李哲锋
李振瑞
邓魏
青龙
Li Zhefeng;Li Zhenrui;Deng Wei;Qing Long(Inner Mongolia Agricultural University,Hohhot 010018,P.R.China)
出处
《东北林业大学学报》
CAS
CSCD
北大核心
2019年第4期91-94,共4页
Journal of Northeast Forestry University
基金
内蒙古自治区创新创业训练计划项目(201810129005)
国家自然科学基金项目(207203019)
关键词
反共振频率
损耗角正切
阻尼层
乐器
Anti-resonance frequency
Loss tangent
Damping layer
Musical instrument
