粘弹性材料力学参数的宽频带测试与动态参数建模研究

项目名称： 粘弹性材料力学参数的宽频带测试与动态参数建模研究

项目编号： No.11474230

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 数理科学和化学

项目作者： 侯宏

作者单位： 西北工业大学

项目金额： 86万元

中文摘要： 研制开发耐水压高、温度适应性好、宽频带声学性能优良的粘弹性材料是声隐身技术的关键，其核心问题是对材料动态力学参数的掌握和声学优化设计。本项目研究材料力学参数宽频带测试方法，建立包含温度和压强因子的力学参数模型。深入分析粘弹性细棒中脉冲压力波传播规律，解决脉冲波几何频散、材料频散和横波干扰等关键科学问题，改善力学参数在中高频段的测试精度；在自由体积理论时温等效方程的基础上推导不同参考温度下有压强修正的WLF方程，由测量数据确定转移因子和松弛因子等模型参数，得到包含温度和压强因子的H-N参数模型，该模型可以对测试频率范围外特定温度和压强条件的力学参数进行预测。在此基础上，给出满足声学性能指标的、适用于大范围温度和压强条件的粘弹性材料选型要求。通过以上研究，解决力学参数宽带精确测试的关键技术问题，掌握粘弹性材料在复杂温度和压强条件下动态力学参数变化规律，为水声材料设计与声学性能优化提供理论依据。

中文关键词： 粘弹性材料；动态力学参数；宽频带测试；参数模型；温度与压强

英文摘要： Characterizing the behavior of viscoelastic materials and their visco-elastic properties subject to under-water ambient presure and temperature changes is crucial in under-water acoustic stealth technology. This proposal aims to develop a more accurate approach that is also applicable in a wider frequency range to extract the complex modulus and loss factor of viscoelastic materials. Specifically, an impulse method that was originally developed and has been validated by the principle applicant for airborne noise applications will be extended to measure the complex modulus and loss factor of viscoelastic materials by utilizing the longitudinal vibration testing over a wide frequency range. To facilitate the study, the propagation of an impulse wavefront along a one dimensional visoelastic rod will be investigated theoretically and experimentally, in which the geometric and material dispersion phenomena will be the focus. Then, a parametric model that incorporates the ambient pressure and temperature etc into the equation for complex -modulus will be developed to give a thorough description of the dynamic behavior of viscoelastic materials subject to environment condition changes. The dynamic parametric will be used to design the viscoelastic material with excellent acoustic properties under any ambient conditions.

英文关键词： viscoelastic material;dynamic parameter;testing in broadband frequency;parameter modeling;temperature and pressure