Koruk Hasan, Rajagopal Srinath
Ultrasound and Underwater Acoustics Group, Department of Medical, Marine and Nuclear, National Physical Laboratory, Teddington, Middlesex TW11 0LW, UK.
Sensors (Basel). 2024 Sep 23;24(18):6137. doi: 10.3390/s24186137.
Although the physical properties of a structure, such as stiffness, can be determined using some statical tests, the identification of damping parameters requires a dynamic test. In general, both theoretical prediction and experimental identification of damping are quite difficult. There are many different techniques available for damping identification, and each method gives a different damping parameter. The dynamic indentation method, rheometry, atomic force microscopy, and resonant vibration tests are commonly used to identify the damping of materials, including soft materials. While the viscous damping ratio, loss factor, complex modulus, and viscosity are quite common to describe the damping of materials, there are also other parameters, such as the specific damping capacity, loss angle, half-power bandwidth, and logarithmic decrement, to describe the damping of various materials. Often, one of these parameters is measured, and the measured parameter needs to be converted into another damping parameter for comparison purposes. In this review, the theoretical derivations of different parameters for the description and quantification of damping and their relationships are presented. The expressions for both high damping and low damping are included and evaluated. This study is considered as the first comprehensive review article presenting the theoretical derivations of a large number of damping parameters and the relationships among many damping parameters, with a quantitative evaluation of accurate and approximate formulas. This paper could be a primary resource for damping research and teaching.
虽然结构的物理性质，如刚度，可以通过一些静态测试来确定，但阻尼参数的识别需要动态测试。一般来说，阻尼的理论预测和实验识别都相当困难。有许多不同的技术可用于阻尼识别，每种方法给出的阻尼参数都不同。动态压痕法、流变学、原子力显微镜和共振振动测试通常用于识别材料（包括软材料）的阻尼。虽然粘性阻尼比、损耗因子、复模量和粘度是描述材料阻尼的常用参数，但也有其他参数，如比阻尼容量、损耗角、半功率带宽和对数减量，用于描述各种材料的阻尼。通常，会测量这些参数中的一个，为了比较目的，需要将测量的参数转换为另一个阻尼参数。在这篇综述中，给出了用于描述和量化阻尼的不同参数的理论推导及其关系。包括并评估了高阻尼和低阻尼的表达式。本研究被认为是第一篇全面的综述文章，给出了大量阻尼参数的理论推导以及许多阻尼参数之间的关系，并对精确和近似公式进行了定量评估。本文可以作为阻尼研究和教学的主要参考资料。
