【作者】 黄娜；

【导师】 肖江；

【作者基本信息】 北京林业大学 ， 机械电子工程， 2010， 硕士

【摘要】 木材工业是我国国民经济的基础产业,在国民经济的发展中占有极其重要的地位。然而,我国林木资源相对匮乏、产品质量不高的状况,使木材供需矛盾日益突出。而多层胶合板是一种可以用低等级木材制成的强度高、性能稳定的优质成材。对多层胶合板弹性模量的检测是提高多层胶合板质量和木材利用率的一个极其重要手段。本文以此为出发点,在分析了国内外木材无损在线检测现状的基础上,综合应用冲击应力波无损检测技术、多层胶合板动态称重技术和多层胶合板厚度在线检测技术等多种高新技术,并借鉴国内外相关的、成熟的检测理论,设计多层胶合板弹性模量检测系统。通过研究得出以下成果：(1)阐述了测量多层胶合板弹性模量的重要意义,总结了当前国内外主流测量方法及其优缺点；(2)制定了一套新型多层胶合板弹性模量检测系统的控制设计方案,结合多种先进检测技术,从理论上验证了其可行性；(3)将触摸屏与PLC结合使用的理念运用在多层胶合板弹性模量检测系统中,做到了界面友好、简单实用、稳定高效,同时增加了系统的经济性,有利于推广使用。更多还原

【Abstract】 Wood industry in China is the foundation of the national economy, and occupies an extremely important status in the development of national economy. However, the situations that our forest resources are relative scarcity and products quality is not high make the contradiction between supply and demand of wood increasingly prominent. Multi-plywood is a high-quality timber with high intensity and steady performance which can be made by low grade wood. So testing the elasticity is a very important way to impove the quality of multi-plywood and utilization ratio of timber.As a starting point, and based on the analysis of status quo about the non-destructive on-line testing techniques home and abroad, this paper comprehensive using many high technology like nondestructive testing technology for impact stress wave, dynamic weighting technology for timber and on-line testing technology for thickness, and also the knowledge of domestic and overseas mature testing theories are taken into consideration.The following are achievements which have receiced through the research:(1) Expatiate the significance of multi-layer plywood elastic modulus detection. Summarize the current domestic mainstream survey method and its advantages and disadvantages. (2) Formulate a new control design for multi-plywood elastic modulus detection system. And then combined with advanced testing techniques, proving it is feasibility by theory. (3) Applied the idea of combine PLC and touch screen to multi-plywood elastic modulus detection system for the first time. Finally make a system that have many advantages as have friendly interface, simple and practical, stable and efficient, so that can increase the efficiency of the system and easily for use and promote.更多还原