百度试验条件下木材含水率场的数学分析及其实用意义

THE MATHEMATICAL ANALYSIS OF MC FIELD OF WOOD DURING THE PERIOD OF 100℃ TEST AND ITS APPLICATION FUNCTION

为将控制工程理论中的系统辩识方法应用于木材干燥技术 ,本文建立起在进行百度试验时沿厚度方向木材含水率场随时间变化的数学模型并求出其数学解。这一数学解表述了在百度试验条件下木材初含水率、干燥时间、即时含水率和相应的扩散系数之间的动态函数关系。据此 ,可以通过试验的方法得到在此条件下不同树种木材水分在不同含水率条件下的扩散系数 ,从而为制定木材干燥基准给出必要的数据。

In order to apply the method of system identification of engineering cybernetics a mathematical model of MC field along lumber thickness changing with the passage of time during the period of 100℃ test was established and its solution was deduced in this paper. The dynamic function relationship among initial MC , drying time, instantaneous MC , and corresponding diffusion coefficient could be shown by this solution. Taking advantage of this the diffusion coefficients of different kinds of wood under different levels of MC in this condition could be obtained by experiments ,and they should be important data of making drying schedules for the target wood. A new train of thought was offered by this study.