当前位置: 首页 > 文章 > 高温热处理对尾叶桉木材声学振动性能的影响 广西林业科学 2017 (2) 140-145
Position: Home > Articles > Effect of High-temperature Heat Treatment on the Acoustic-vibration Performance of Eucalyptus urophylla Guangxi Forestry Science 2017 (2) 140-145

高温热处理对尾叶桉木材声学振动性能的影响

作  者:
朱玲静;刘一星;刘镇波;冯昌信;韦春义
单  位:
东北林业大学材料科学与工程学院;广西生态工程职业技术学院
关键词:
尾叶桉;木材热处理;声学性能
摘  要:
以N2为保护气体,对尾叶桉(Eucalyptus urophylla)木材进行热处理,热处理温度分别为170、190、210℃,保温时间分别为2、3、4 h,并分析处理前后其声学振动参数(比动弹性模量E/ρ、声辐射品质常数R、声阻抗ω、弹性模量与剪切模量之比E/G等)的变化,结果表明:经适当温度与保温时间的热处理后,尾叶桉处理材的E/ρ、R、E/G可得到不同程度的提高,而其ω则呈下降趋势,使得木材的声学振动性能得到有效改善。其中处理材的E/ρ的最大增幅为12.3%(190℃、2 h),其R的最大增幅为16.7%(210℃、3 h),其E/G的最大增幅为14.2%(210℃、4 h),其ω的最大降幅为6.0%(210℃、4 h)。总体结果表明,当热处理温度为210℃、保温时间为3 h时,尾叶桉木材的振动性能得到较好的改善。
译  名:
Effect of High-temperature Heat Treatment on the Acoustic-vibration Performance of Eucalyptus urophylla
作  者:
ZHU Ling-jing;LIU Yi-xing;LIU Zhen-bo;FENG Chang-xin;WEI Chun-yi;Guangxi Eco-engineering Vocational and Technical College;College of Material Science and Engineering,Northeast Forestry University;
关键词:
Eucalyptus urophylla;;wood heat treatment;;acoustic performance
摘  要:
The acoustic-vibration parameters of Eucalyptus urophylla, including specific Young's modulus(E/ρ),coefficient of sound-radiation resistance(R),sound resistance(ω), and the ratio of Young's modulusto the dynamic stiffness modulus(E/G), before and after heat treatment were measured and characterized.Conditions for the heat treatment included N2 as the protection gas and temperatures of 170 ℃,190 ℃,and210 ℃ with holding times of 2 h,3 h,and 4 h. The results showed that specific Young's modulus,thecoefficient of sound-radiation resistance, and the ratio of Young's modulus to the dynamic stiffness modulusincreased, whereas sound resistance decreased, thereby the heat treatment with proper temperature andsuitable holding time improved the acoustic-vibration performance of the wood. The maximum increments were12.3% for specific Young's modulus(190 °C,2 h),16.7 % for the coefficient of sound-radiation resistance(210 °C,3 h),and 14.2% for the ratio of Young's modulus to the dynamic stiffness modulus(210 ℃,4 h).Conversely,the maximum decrease in sound resistance was 6.0 %(210 ℃,4 h). Overall,the acoustic-vibrationperformance of E. urophylla was improved through heat treatment,while the best vibration performance wasobtained at 210 °C with a holding time of 3 h.

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