MRI: Acquisition of a Multipoint Laser Vibrometer for Studying Multiscale and Nonstationary Dynamics of Materials and Complex Structures

该主要研究仪器奖支持收购多点激光振动计（MPV 800）系统，以实现土木和机械工程，材料和生物医学工程的潜在变革性研究。 MPV800系统可跟踪瞬态和随机振动以及结构变形，使研究人员能够监测具有挑战性几何形状和软材料（如生物组织）的材料、组件和系统的动态响应。MPV 800还监测非线性振动和波传播。研究人员将进一步了解复杂系统的动态行为，这可能导致疾病早期诊断的进步，更可靠的3D打印过程以及具有增强弹性的新型材料和结构的开发。MPV800系统还将用于实验室项目，以培养下一代振动工程师，并为工业和公众举办推广活动。MPV800激光测振仪配备5个光学单元和40个光纤头，可实现空间分辨率高达0.5 mm的非接触式全场振动测量，带宽范围从几Hz到100 kHz。该新系统还使用1550 nm的波长，在测试软材料和硬材料时具有更高的反射率和更低的噪声，甚至包括生物组织、溶胀聚合物和水凝胶等含水量高的材料。共有10个主要用户将使用该系统测量软质、多孔、多相和硬质材料的动态响应，在时间和空间上具有前所未有的范围和分辨率。MPV800系统将提供必要的测量，以更新民用和航空航天应用中复杂组件的模型。 它还将用于3D打印部件和组织支架的非接触式表征和结构健康监测。分析波在软骨和肌腱中的传播将揭示这些组织的高负荷率响应和导致骨关节炎的组织行为的新见解。

This Major Research Instrumentation award supports the acquisition of a Multipoint Laser Vibrometer (MPV800) system to enable potentially transformative research in civil and mechanical engineering, materials, and biomedical engineering. The MPV800 system tracks transient and random vibrations and structural deformations, allowing researchers to monitor the dynamic response of materials, components and systems with challenging geometries and soft materials, such as biological tissues. The MPV 800 also monitors nonlinear vibration and wave propagation. Researchers will gain an enhanced understanding of the dynamic behavior of complex systems that can lead to advances in early-diagnosis of disease, more reliable 3D printing processes and the development of novel materials and structures with enhanced resilience. The MPV800 system will also be used in laboratory projects to educate the next generation of vibration engineers and outreach events for industry and the public.The MPV800 laser vibrometer with 5-optical units and 40 fiber heads enables noncontact and full-field vibration measurements up to 0.5 mm spatial resolution, and bandwidth ranging from several Hz to 100 kHz. This new system also uses a wavelength of 1550 nm for higher reflectance and lower noise in testing soft and hard materials, even materials with high water content such as biological tissues, swollen polymers and hydrogels. A total of 10 major users will use the system to measure the dynamic response of soft, porous, multiphasic, and hard materials with an unprecedented range and resolution in time and space. The MPV800 system will provide essential measurements to update models of sophisticated assemblies in civil and aerospace applications. It will also be used for noncontact characterization and structural health monitoring of 3D printed parts and tissue scaffolds. Analysis of wave propagation in cartilage and tendons will reveal new insights on the high loading-rate response of those tissues and the tissue behavior that leads to osteoarthritis.