Vibrations of a flexible membrane coupled to a liquid material sample during its phase transition to solid: modelling, validation and identification

与液体材料样品相变到固体期间耦合的柔性膜的振动：建模、验证和识别

• 批准号: 533985-2018
• 负责人: Amabili, Marco
• 金额: $ 2.84万
• 依托单位: McGill University
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=698494
• 关键词: Vibrations; flexible; membrane; coupled; liquid

Material characterization is primordial for R&D, manufacturing processes and quality control, in particular for soft viscoelastic materials in agri-food - dairy - and life sciences industries. However, the classical methods to identify their bulk properties, such as rheometers, are mainly destructive, needing many different samples to test a material at different stages, resulting in a loss of statistical strength. Such issues are solved by a wave-propagation method inspired by medical dynamic elastography and developed by the Canadian company Rheolution as an at-line compatible technique to measure, without any prior knowledge, viscoelastic properties of soft solid materials. This patented technology consists in measuring the free response to a vibrational impulse of a bi-layered system comprised of a material specimen and of a flexible membrane, bottom of a solid cylinder sample holder. Its response is compared to the simulation of a model in which the only unknowns are the specimen's viscoelastic parameters, allowing their identification thanks to an error minimization procedure. However, this model fails to reproduce the response for extremely soft solids and for materials transitioning between liquid and solid states, significant in Rheolution's targeted markets. Therefore, this project aims at developing a model of this bi-layered system's behavior for such samples. Experiments will be conducted to comprehend the system's vibrational response with such specimens and to optimize its design. The specimen's viscoelastic or rheological behavior, its interaction with the solid sample holder and its influence on the membrane's vibrations, will be derived and linked to the existing theory for soft solid materials to obtain a generalized model of this system to be validated with experimental data. Then, algorithms will be formulated to identify the sample's viscoelastic parameters and applied on typical materials. This extended technique will improve the yield of Canadian dairy industry production lines - allowing for more ecological and cost-effective production - and will help simple, cheaper and more accurate characterization of biomaterials gelation or degradation, for drug delivery or tissue regeneration, and thereby enhancing Canadians' health.

材料表征对于研发，制造过程和质量控制是原始的，尤其是农业食品中的软粘弹性材料 - 乳制品和生命科学行业。但是，鉴定其大量特性（例如流变仪）的经典方法主要是破坏性的，需要许多不同的样品在不同阶段测试材料，从而导致统计强度损失。这些问题是通过受医学动态弹性启发的波传播方法来解决的，并由加拿大公司Rheolution开发，作为一种在没有任何先验知识的无知的粘弹性特性的柔软固体材料的粘弹性。该专利技术包括测量对由材料标本和柔性膜组成的双层系统的振动脉冲的自由响应，该系统的底部是实心缸样品固定器的底部。将其响应与模型的仿真进行了比较，在该模型中，唯一未知数是标本的粘弹性参数，因此允许其识别，这要归功于误差最小化过程。但是，该模型未能重现极度柔软的固体和液态和固态之间的材料过渡的响应，这对于Rheolution的目标市场很重要。因此，该项目旨在为此类样本开发该双层系统行为的模型。将进行实验，以使用此类标本来理解系统的振动响应并优化其设计。标本的粘弹性或流变性行为，它与固体样品持有人的相互作用及其对膜振动的影响，将得出并与现有的软材料的现有理论联系起来，以获得该系统的广义模型，以通过实验数据验证。然后，将制定算法以识别样品的粘弹性参数并应用于典型的材料上。这项扩展的技术将提高加拿大乳品行业生产线的产量 - 允许更具生态和成本效益的生产 - 并将有助于对生物材料凝胶化或退化的简单，更便宜，更准确的表征，用于药物递送或组织再生，从而增强加拿大人的健康。