基于压电扭转振动的微型流体粘度计的研究

项目名称： 基于压电扭转振动的微型流体粘度计的研究

项目编号： No.51205338

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 机械工程学科

项目作者： 潘成亮

作者单位： 合肥工业大学

项目金额： 25万元

中文摘要： 粘度是流体重要的物理参数之一，粘度测定在能源化工、生物医疗、食品等工业生产和科学研究领域中不可缺少。传统的粘度测量方法包括毛细管法、落球法、旋转法等。然而，这些方法都存在一定的缺陷，如结构复杂、测试时间长、难以在线监测等，应用场合存在很大的局限性。我们提出一种利用新型压电陶瓷扭转振动元件测量流体粘度的方法，通过灵活的振动激励、耦合和感应测量系统的设计，以实现针对不同应用需求的在线粘度测定，同时具有结构简单、体积小、成本低、测量速度快、范围大、准确度高等优点。本项目开展基于压电扭转振动的微型流体粘度计的研究；通过分析不同振动激励、耦合和感应方式，研究实现粘度测量的机理和设计；建立合适的系统理论模型，分析不同测量方法下振动参数与流体特性的关系；探索提高粘度测量性能的方法，优化振动耦合方式，提高粘度测量灵敏度和范围，分析系统自身可靠性和温度特性及其对性能的影响，研究误差补偿的措施。

中文关键词： 粘度测量；压电元件；扭转振动；螺旋电极；等效电路

英文摘要： Viscosity is an important physical parameter of the fluids. Viscosity measurement is indispensable in industrial production and scientific research fields of energy, chemical, biomedical, food, and many others. The traditional viscosity measurement methods include capillary, falling ball, and rotational methods. However, these methods have some flaws, such as structural complexity, long test time, difficult for on-line monitoring, which limit their applications. We propose a new type of piezoceramic element with torsional vibration to measure the viscosity of fluids. Through flexible measurement system designs of vibrational exciting, coupling, and sensing, on-line viscosity measurement can be achieved to meet different application requirements, with other advantages of simple structure, small size, low cost, fast testing, broad range, high accuracy, etc. The project will carry out the research of miniaturized fluid viscometer based on piezoelectric torsional vibration. By analyzing the different vibrational exciting, coupling and sensing methods, the mechanism and design of viscosity measurement system will be studied. Appropriate theoretical system models will be developed to analyze the relationship between the vibration parameters and fluid properties by different measurement methods. Ways to improve the mea

英文关键词： Viscosity measurement；Piezoelectric elements；Torsional vibrations；Helical/spiral electrodes；Equivalent circuits