本SAE标准描述了一种实验室试验程序，用于测量由粘结在振动悬臂钢筋上的阻尼材料组成的系统的振动阻尼性能。棒通常被称为Oberst棒（以H.Oberst博士的名字命名），测试方法通常被称为Oberst棒测试方法。用于阻尼处理的材料可包括均质材料、非均质材料，或均质、非均质和/或非弹性（如铝箔）材料的组合。这些材料通常安装在运输系统中，如地面车辆、海洋产品和飞机，以减少共振时的振动，从而减少振动表面的噪声辐射。 本文所述的试验方法旨在对订购材料进行排序，以便在使用通用汽车钢的面板上使用，但也可适用于其他情况或条件。大多数材料和系统的阻尼性能随频率和温度的变化而变化。因此，本试验程序包括在适用于许多运输系统的频率和温度范围内测量阻尼的规定。在大约100至1000 Hz的频率范围内，在给定应用的有效温度范围内，测量的阻尼性能将以复合损耗系数？c表示。 复合材料一词指的是钢材和阻尼材料的组合。因此，复合损耗系数取决于钢和阻尼材料层的厚度、阻尼和模量。此处描述的试验程序基于ASTM E756中描述的方法。然而，本SAE文件与ASTM E756方法的不同之处在于，SAE规程规定了棒材材料、三种棒材尺寸、试样的安装条件以及建议的标准插值频率。本文件提供了一种根据代表典型钣金应用的试样的复合损耗因数值对阻尼材料进行排序的方法。 如果满足附加条件，可根据本文件规定的试样计算阻尼材料的材料特性，包括杨氏模量E和材料损耗系数。ASTM E756定义了这些附加条件以及用于计算单层（Oberst梁）结构阻尼材料特性的方程式。

This SAE Standard describes a laboratory test procedure for measuring the vibration damping performance of a system consisting of a damping material bonded to a vibrating cantilevered steel bar. The bar is often called the Oberst bar (named after Dr. H. Oberst) and the test method is often called the Oberst bar test method. Materials for damping treatments may include homogeneous materials, nonhomogeneous materials, or a combination of homogeneous, nonhomogeneous, and/or inelastic (such as aluminum foil) materials. These materials are commonly installed in transportation systems such as ground vehicles, marine products, and aircraft to reduce vibration at resonance, and thus reduce the noise radiation from the vibrating surface. The test method described herein was developed to rank order materials for application on panels using general automotive steel but also may be applicable to other situations or conditions.Damping performance for most materials and systems varies as a function of both frequency and temperature. Accordingly, this test procedure includes provisions for measuring damping over a range of frequencies and temperatures found applicable to many transportation systems. The measured damping performance will be expressed in terms of composite loss factor, ¿¿c, within the frequency range of approximately 100 to 1000 Hz, and over the useful temperature range for the given application. The term composite refers to the steel and damping material combination. The composite loss factor is, therefore, dependent upon the thickness, damping, and modulus of both the steel and damping material layer.The test procedure described here is based on the method described in ASTM E756. However, this SAE document differs from the ASTM E756 method in that the SAE practice specifies the bar material, three bar sizes, the mounting conditions of the test samples, and suggested standard interpolation frequencies. This document provides a means of rank ordering damping materials according to their composite loss factor values from test samples that represent typical sheet metal applications.The material properties of the damping material alone, including Young¿¿¿s modulus E, and the material loss factor ¿¿, may be computed from the test samples specified in this document if additional conditions are met. ASTM E756 defines these additional conditions as well as the equations to be used to compute the damping material properties for the single layer (Oberst beam) configuration.