QQ客服 官方微博 反馈留言

题名	一类高分子材料及表面功能材料声特性研究
作者	姚磊
学位类别	博士
答辩日期	2008-05-29
授予单位	中国科学院声学研究所
授予地点	声学研究所
关键词	宽带声学性能 动态力学性能 时温等效原理 声管 流体阻力 流噪声 疏水涂层 减阻降噪 水洞
其他题名	Study on acoustical performance of one kind of macromolecular material and functional coating material
学位专业	声学
中文摘要	随着材料科学的飞速发展，很多新型材料应用于声学领域，这就对新型材料声学性能的研究提出了迫切要求。本文开展了一类高分子材料宽带声学性能和表面功能材料流阻流噪声特性两个课题的研究。主要研究工作和相关结果如下： 本文第一部分研究了一种基于动态粘弹谱特性测量橡胶等高分子材料宽带声学参数的混合方法。首先利用动态粘弹仪测量材料的低频（< 100Hz）动态力学参数，按照时温等效原理将获得的参数拓展到声学关注的频段（100Hz～10kHz），再辅以声学测量与反演手段得到材料的声学参数。采用该方法对一种异戊橡胶材料进行了测量，并把测量结果用于该材料样品在声管中所构成的分层介质模型的仿真计算，得到的吸声系数计算值与声管实测值一致。 本文第二部分从表面功能材料科学的最新研究成果入手，结合水下航行器减阻降噪的需求，进行表面功能材料减小流阻与降低流噪声的理论和实验研究。在理论方面，研究了材料物性（亲水性、疏水性、粗糙度等）与流阻和流噪声的关系，认为疏水涂层减小流体与壁面的相互作用，可达到减阻降噪的效果。在实验方面，主要利用重力式水洞条件并完善阻力测试条件，分别采用金属回转体模型和聚氨酯管模型，深入研究了我国学者新研制的三类疏水涂料的表面阻力特性和流噪声特性，经多次对比测试得到其减阻降噪效果随流速、频率变化关系，结果表明疏水涂层具有一定的减阻降噪效果。由于该系列涂层的环境适应性和可靠性已经得到试验验证，因此其具有较好的工程应用前景。
英文摘要	With the development of material science, many new materials are widely applied in acoustic fields. Therefore, research on the acoustical performances of these materials is necessary. Two subjects, the acoustical performance of macromolecular materials and the flow resistance and noise performance of functional coating, are studied in this paper. The main work and the results are as follows: In the first part of the paper, a mixed method for measuring broad band acoustic properties of macromolecular materials is presented. The dynamic mechanical parameters of materials are first measured by using Dynamic Mechanical Thermal Apparatus(DMTA) at low frequencies, usually less than 100 Hz; then based on the Principles of Time-Temperature Superposition (TTS), these parameters are extended to the frequency range that acousticians are concerned about, usually from hundreds to thousands of hertz; finally the extended dynamic mechanical parameters are transformed into acoustic parameters with the help of acoustic measurement and inverse analysis. To test the feasibility and accuracy, we measure a kind of rubber sample in DMTA and acquire the basic acoustic parameters of the sample by using this method. While applying the basic parameters to calculating characteristics of the sample in acoustic pipe, a reasonable agreement of sound absorption coefficients is obtained between the calculations and measurements in the acoustic pipe. In the second part of the paper, theoretical and experimental studies on flow noise and resistance reduction for underwater vehicles are made with the newest development in material science. The aim is to explore and develop a coated structure based on functional material, which can be used in flow noise and resistance reduction. On theoretical aspect, study of the relation between physical properties (such as hydrophilicity, hydrophobicity and roughness.) and flow resistance and noise is made. The conclusion has been drawn that hydrophobic surface can reduce flow resistance and noise because of its performance on reducing the mutual action between fluid and solid surface. Furthermore, the effect of roughness can be notable at high flow velocity. On experimental aspect, the characters of three kinds of hydrophobic coating (on rotator model and PUR pipe model) provided by other academicians were studied with the gravitational water tunnel. The relations between resistance and noise reduction effects and velocity of flow and frequency are gotten by several contrastive measurements. Experimental results show that the hydrophobic material can reduce the flow resistance and noise at a certain extent. Since the environmental adaptability and reliability of these series of coating are validated by early experiment, a well engineering application foreground can be expected.
语种	中文
公开日期	2011-05-07
页码	97
内容类型	学位论文
源URL	[http://159.226.59.140/handle/311008/284]
专题	声学研究所_声学所博硕士学位论文_1981-2009博硕士学位论文
推荐引用方式 GB/T 7714	姚磊. 一类高分子材料及表面功能材料声特性研究[D]. 声学研究所. 中国科学院声学研究所. 2008.

个性服务

查看访问统计

相关权益政策

暂无数据

收藏/分享

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。