• Key message

The specific dynamic elastic modulus, acoustic radiation, logarithmic decrement, sound transmission parameter, and acoustic conversion efficiency of spruce wood (Picea jezoensis var. microsperma (Lindl.) W.C.Cheng & L.K.Fu) were improved by extraction treatment with deionized water, dichloromethane, benzyl alcohol, and ethanol. A larger improvement was achieved after extraction with benzoyl alcohol and dichloromethane extraction than by using ethanol and deionized water.

• Context

It is necessary to improve the acoustic vibrational properties of wood to solve the problem of resource shortage of wood with excellent acoustic vibrational properties for the soundboards of musical instruments and to improve the use value of wood.

• Aims

The effects of extraction treatment with deionized water, dichloromethane, benzyl alcohol, and ethanol on the acoustic vibrational properties of spruce wood were evaluated.

• Methods

After the acoustic vibrational properties of untreated wood samples were measured using the free-free flexural vibration test method with a fast Fourier transform spectrum analyzer (FFT, CF-5220Z), extraction treatment of the wood samples was separately performed with deionized water, dichloromethane, benzyl alcohol, and ethanol for 15 days at room temperature and pressure, followed by drying. The acoustic vibrational properties of the treated wood samples were then measured, and the effect of extraction treatment on the acoustic vibrational properties was analyzed.

• Results

The increase in the specific dynamic elastic modulus was highest (14.5%) after the benzyl alcohol treatment. The acoustic radiation clearly improved after the ethanol treatment (18.1%). The acoustic impedance of the wood treated by dichloromethane extraction decreased significantly (−4.35%), while the logarithmic decrement was significantly reduced (−52.0%) by benzyl alcohol treatment. From the viewpoint of energy utilization, with benzyl alcohol treatment, the acoustic conversion efficiency and transmission parameter increased by 124% and 125%, respectively.

• Conclusion

The degree of improvement in the acoustic vibrational properties of wood differed depending on the solvent used. Greater improvement was observed after extraction with benzoyl alcohol and dichloromethane as compared to ethanol and deionized water.

中文翻译：

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提取物对云杉云杉声学振动特性的影响。W.Cheng＆LKFu（精子）

• 关键信息

通过用去离子水，二氯甲烷，苄醇萃取处理，改善了云杉木材（Picea jezoensis var。microsperma（Lindl。）WCCheng＆LKFu）的比动弹性模量，声辐射，对数减量，传声参数和声转换效率。和乙醇。与使用乙醇和去离子水相比，用苯甲醇和二氯甲烷萃取后可实现更大的改进。

• 语境

有必要改善木材的声振动特性，以解决具有优良的乐器振动板声振动特性的木材资源短缺的问题，并提高木材的使用价值。

•目的

评价了用去离子水，二氯甲烷，苯甲醇和乙醇萃取处理对云杉木材声学振动特性的影响。

• 方法

在使用快速傅里叶变换频谱分析仪（FFT，CF-5220Z）使用自由挠曲振动测试方法测量未经处理的木材样品的声学振动特性后，分别用去离子水，二氯甲烷，苯甲醇和乙醇在室温和压力下放置15天，然后干燥。然后测量经处理的木材样品的声振动特性，并分析提取处理对声振动特性的影响。

• 结果

在苯甲醇处理后，比动弹性模量的增加最高（14.5％）。乙醇处理后，声辐射明显改善（18.1％）。通过二氯甲烷萃取处理的木材的声阻抗显着降低（-4.35％），而对苯甲醇的对数降低显着降低（-52.0％）。从能量利用的角度来看，使用苯甲醇处理后，声转换效率和传输参数分别提高了124％和125％。

• 结论

木材的声振动特性的改善程度根据所使用的溶剂而不同。与乙醇和去离子水相比，用苯甲醇和二氯甲烷萃取后观察到更大的改善。