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阻尼技术在减振降噪方面的应用已在近几十年内得到了飞跃的发展。但迄今为止国际上尚无统一标准方法以确定粘弹性材料及其结构的损耗因子和弹性模量等物理参数。虽然目前已有多种阻尼测量的手段；但其中的大多数仅适用于测量材料的物理参数。而频率响应法和自由衰减法等常用于测量复合结构物理参数的方法均不适用于大阻尼的结构。本文提出一种以悬臂梁为基础，利用微计算机及其接口技术，研究沿悬臂梁自由衰减的前进波，并运用线性近似理论得出复合结构物理参数的方法。实验证明该方法具有一定的精度和可重复性，是一种测量大阻尼结构物理参数的有效手段。它弥补了其它一些方法的不足，使测量阻尼的手段更趋完善。
The application of damping technology in vibration and noise reduction has been leaping in recent decades. However, so far there is no uniform standard method to determine the viscoelastic material and its structure such as loss factor and elastic modulus and other physical parameters. Although there are many means of damping measurements, most of them are only suitable for measuring the physical parameters of materials. However, the commonly used methods to measure the physical parameters of composite structures, such as frequency response method and free-fall method, are not suitable for large damping structures. In this paper, we propose a method of using the microcomputer and its interface technology to study the free attenuation of the cantilever beam along the cantilever beam, and using the linear approximation theory to get the physical parameters of the composite structure. Experiments show that the method has some accuracy and repeatability, which is an effective measure to measure the physical parameters of large damping structure. It makes up for the deficiencies of some other methods, to make the measurement of damping means more perfect.