【作者】 逄海峰；

【导师】 马岩；

【作者基本信息】 东北林业大学 ， 机械设计及理论， 2006， 硕士

【摘要】 木材弹性模量与刚度、硬度、强度等力学性能的基础参数有密切关系。因此我们通过检测木材的弹性模量来对木材进行分等，保证加工后产品质量。传统的静态法测量弹性模量由于测量时间较长，测量过程繁琐，对试件的尺寸规格和形状要求严格，具有破坏性，只适合进行抽样检测，不能满足木材生产中非破坏性快速检测和持续检测的需要。国外销售的分级检测线价格昂贵，不能被国内木材加工企业所接受。国内对板材弹性模量检测进行了大量研究，但大多处于实验室阶段，未能应用到生产实践中。因此开发能够适合实际生产，符合我国国情的板材弹性模量自动检测设备对我国板材分级技术有一定的促进，一定具有良好的市场前景。 本文介绍开发的板材弹性模量自动检测设备是综合FFT分析技术、数控技术和微机技术开发的一种关于木材杨氏模量和剪切弹性模量的快速测定设备。该设备是通过木材的打击音响进行FFT分析和微机计算来测得木材的杨氏模量和剪切弹性模量，通过测得的动态杨氏模量与静态杨氏模量之间具有的紧密关系来由动态杨氏模量表征静态杨氏模量。相比于其它方法，整个检测过程耗时短、自动化程度高、不损坏板材、大大节约了成本。 本文主要介绍了板材弹性模量自动检测设备的检测原理、机械部分设计、自动控制顺序、软件编程设计等部分。着重介绍了检测殴备的数据采集和处理，对系统的检测结果进行分析。说明检测系统能够实现快速对板材进行在线NDT并相应进行应力分等，测量结果比较精确，并且价格低廉，达到预期目标。更多还原

【Abstract】 Lumber elastic modulus has close relations with mechanics performance such as rigidity 、 hardness and intensity and so on. So we classify’ wood depends on elastic modulus to guarantee the product quality after processing. Because the traditional methods measure lumber elastic modulus with long time and destructive, it can’t satisfy our needs for continuous and nondestructive tests. The classify test device in aboard has high price, it can’t be accepted by our processing enterprise. Our country measures a large amount of research on the elastic modulus for wood, but mostly at the stage of laboratory, failed to apply to production practices. So developing a kind of wood elastic modulus automatic device which can be suitable for producing actually, accords with the national conditions of our country has certain promotion to the wood classify technology of lumber of our country, it must have good market prospects .This paper introduced lumber elastic modulus is a kind of fast testing device for lumber elastic modulus with FFT、 numerical control and computer technology. The device acquired lumber elastic modulus by FFT analysis and calculating by computer on knocked sound. By the examination, we know it has close relations between lumber dynamic elastic modulus and static state elastic modulus. Compare on other method, whole detection procedure time consuming and short, automatic intensity high, non-destructive for lumber and saving cost greatly.This paper has introduced the testing principle、 mechanical part designed、 automatic control order and software programming for lumber elastic modulus automatic testing device. It mainly introduced data collection and processing and analyzing the testing result of the system. It made out the testing system can classify lumber and Nondestructive Testing fast. It is more accurate for measure the result, and cheap, accord with market needs.更多还原