Basic research on the development of damping wood-based materials

阻尼木质材料开发基础研究

基本信息

批准号：
05660181
负责人：
MIZUMACHI Hiroshi
金额：
$ 1.34万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

项目摘要

Noise arising from vibrating parts of various kind of structures could be harmful to Society. and effective expedients for preventing noise have great industrial interest. Wood-based materials are abundantly used as the materials related housing, furniture, packaging and others, and sometimes we have to reduce noise from the vibrating parts of the materials according to the social regulations or from technological standpoints. Adhesives are viscoelastic materials, and therefore each adhesive shows an extremely large damping property within a relatively narrow range of temperature and frequency. Therefore, if we can control the chemical structure and fine structure of the polymer such that it damps vibration in the temperature- and frequency- region corresponding to the actual applicational conditions, and if we apply the polymer as an adhesive, then we can develop a new functional composite material which damps vibration, thus reducing noise. In this study, we have found that the bending vibration of the composites is much more important than the longitudinal vibration, concerning this matter, and a new method of measuring the dynamic mechanical properties by the bending mode. We have found a rule which governs the relationship between the viscoelastic properties of the composites and those of the adhesive which is involved in the composite. It became clear that a symmetrically spaced multilayred structure is preferred in order to get a larger damping. And in order to obtain better adhesives for our purpose, we have investigated on the viscoelasticity of a series of IPNs and polymer blends and on the damping capacity of the composites with woods. Finally, we imposed some mechanical shock on the composites and the noise was analyzed by FFT analyzer. Information which we obtained in this study will serve a good guideline for the development of new wood-based functional composite materials.

各种结构的振动部件产生的噪音可能对社会有害。有效防止噪音的措施具有重大的工业意义。木质材料被大量用作与住房、家具、包装等相关的材料，有时我们必须根据社会法规或从技术角度来降低材料振动部分的噪音。粘合剂是粘弹性材料，因此每种粘合剂在相对较窄的温度和频率范围内表现出极大的阻尼特性。因此，如果我们能够控制聚合物的化学结构和精细结构，使其在与实际应用条件相对应的温度和频率范围内阻尼振动，并且如果我们将聚合物用作粘合剂，那么我们就可以开发出新型功能复合材料可阻尼振动，从而降低噪音。在这项研究中，我们发现复合材料的弯曲振动比纵向振动重要得多，就此问题，我们提出了一种通过弯曲模式测量动态力学性能的新方法。我们发现了控制复合材料的粘弹性特性与复合材料中所涉及的粘合剂的粘弹性特性之间关系的规则。很明显，为了获得更大的阻尼，优选对称间隔的多层结构。为了获得更好的粘合剂，我们研究了一系列互穿网络和聚合物共混物的粘弹性以及与木材的复合材料的阻尼能力。最后，我们对复合材料施加了一些机械冲击，并通过 FFT 分析仪分析了噪声。本研究获得的信息将为新型木质功能复合材料的开发提供良好的指导。