基于声卡和Adobe Audition的动弹性模量测试方法研究

摘要

弹性模量是表征材料弹性性质的特征物理量,在工程应用中具有重要的作用.设计了基于声卡和Adobe Audition的材料动弹性模量测定的测试系统,基于声卡的数据采集系统由传感器、调理装置、计算机组成.对不同长度的等强度悬臂梁进行实验,利用Matlab软件进行实验数据分析,得到悬臂梁的固有频率,从而根据理论公式计算出材料的动弹性模量,并与有限元分析结果进行比较.实验结果表明该测试系统测量精度较高,该试验方法简单易行,具有较强的实用性.%Elastic modulus is a physical quantity representing the elastic properties of the material, which is very important in engineering application.A test system of dynamic elastic modulus is proposed based on sound card and Adobe Audition,ire which the data acquisition system based on sound card is composed of a sensor,a processing device and a computer.Meanwhile different lengths of equal strength cantilever beams are experimented, which empirical data obtained are analyzed by using Malah.Thus the natural frequencies of cantilever beams are gained, and then dynamic elastic modulus is worked out based on the theoretical formula,which is compared with the finite element analysis.The results indicate that the test system is simple and feasible with high precise in me as wing, therefore it is practicable.