两种国际通用乒乓球拍底板木材的固有频率及其影响因素  

The study of the natural frequency and its impact factors of two types of international common wood for table tennis racket blade

作　　者：卢晓宁[1] 何倩[1] 姚有涛 张海洋[1] 卢可[1] 鞠泽辉 

机构地区：[1]南京林业大学材料科学与工程学院,南京210037 [2]扬州怡人木业有限公司,江苏扬州225008

出　　处：《林业工程学报》2016年第1期16-20,共5页Journal of Forestry Engineering

基　　金：国家林业局引进国际先进林业科学技术计划项目(948)(2015-4-57);概念木屋中功能性复合材料的开发(YZ2014131)

摘　　要：以白梧桐、红桧两种国际通用乒乓板木材为试验材料，采用悬臂板一端固定的横向振动方法，研究木材试件的含水率、纹理角、树种、比模量与固有频率的关系。结果表明：木材试件固有频率随含水率的增加而降低，当含水率达到20％以上时，两种树种固有频率值的变化趋于缓和。在含水率变化范围内，白梧桐试件固有频率值在66～56 Hz之间变化，红桧试件固有频率值在76～60 Hz之间变化。白梧桐、红桧两种树种试件的固有频率均值分别为56．32和69．01 Hz，但白梧桐试件固有频率的稳定性高于红桧，且径切板试件的固有频率大于弦切板的固有频率。在相同尺寸、测试方法和条件下，两种树种试件的固有频率值与比模量的关系符合薄板振动理论推导出的固有频率解的形式；红桧试件的比模量大于白梧桐试件的比模量。通过计算材料的弹性模量和密度，得出相应的比模量，从而可以判断出此材料的固有频率值。As international common wood species for table tennis racket blade, Ayous and Cypress were chosen as the re-search objects. Based on acoustic and vibration theory of wood, the relationship among the natural frequency and moisture con-tent, grain direction, wood species and specific modulus were studied by adopting transverse vibration method with cantileverfixed at one end. The results showed that the natural frequency of wood specimens decreased with the increased moisture con-tent. With the moisture content rose up to more than twenty percent, the change of natural frequencies appeared to be modera-ting. Within the change range of moisture content, the natural frequency value of Ayons and Cypress ranged from 66 to 56 Hz,76 to 60 Hz respectively. The average natural frequencies of Ayons and Cypress were 56. 32 and 69. 01 Hz respectively, but thenatural frequency stableness of Ayons is greater than that of Cypress. The natural frequency of the quarter-Asawn test speci-mens was greater than that of flat-sawn. Under the same dimension, testing method and condition, the relationship between thenatural frequency and specific modulus matched the form of the natural frequency＇s solution which could be deduced from thetheory of plate vibration. The Cypress＇s specific modulus was greater than that of Ayous. The natural frequency of materialcould be estimated by calculating the modulus of elasticity, density and specific modulus.

关 键 词：乒乓球拍 底板 白梧桐 红桧 固有频率 含水率 纹理角 比模量 

分 类 号：S781.3[农业科学—木材科学与技术]