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.

各种结构的振动部分引起的噪音可能对社会有害。预防噪音的有效权宜具有极大的工业兴趣。基于木材的材料大量用作相关的外壳，家具，包装等，有时我们必须根据社会法规或技术的角度从材料的振动部分中减少噪音。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显示出极大的阻尼特性。因此，如果我们能够控制聚合物的化学结构和精细结构，从而使其在与实际应用条件相对应的温度和频率区域中抑制振动，并且如果我们将聚合物用作粘合剂，那么我们可以开发一种新的功能复合材料，从而减少振动，从而减少噪声。在这项研究中，我们发现复合材料的弯曲振动比有关此问题的纵向振动要重要得多，以及通过弯曲模式测量动态机械性能的新方法。我们发现了一个规则，该规则控制了复合材料的粘弹性特性与复合材料所涉及的粘合剂的关系之间的关系。很明显，为了获得更大的阻尼，对对称间隔的多层结构是首选的。为了为我们的目的获得更好的粘合剂，我们已经研究了一系列IPN和聚合物混合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休克，并通过FFT分析仪分析了噪声。我们在这项研究中获得的信息将为开发新的木材功能复合材料提供良好的指南。