摘要
该文以兴安落叶松为研究对象,探讨了试件锯解时因摩擦热造成的水分损失,试件在烘箱中烘干时间过长而产生的热分解,试件带热称重时重量传感器的温度效应等因素对采用称重法检测木材含水率的测量精度的影响;试验获得了相应的修正公式,对多片试件平均含水率的传统计算法进行了修正.研究表明:锯解时木材水分损失对称重法测量精度的影响程度随含水率升高而增大;过长时间在烘箱中的热分解,带热称重时重量传感器的温度效应等对称重法测量精度除极精确的研究外,可以忽略.
With larch timbers as research material, the influences on the measurement accuracy by oven drying method were studied by analyzing the moisture loss for friction heat when specimens were sawn, the thermal decomposition of specimens in oven for an overtime drying, and the weight change of specimens caused by the temperature decline when weighed with heat. Through the experiments, the modified formula was presented on the measurement accuracy by oven drying method for moisture loss when sawing specimens, and the conventional calculation on average moisture content of multi_piece specimens was modified as well. The results showed that the influence caused by moisture loss when sawing specimens on the measurement accuracy by oven drying method increased with the increase of moisture content of specimens. The influence on thermal decomposition in oven for an overtime drying and the influence on the specimens' weight measured with heat were not obvious and can be ignored.
出处
《北京林业大学学报》
CAS
CSCD
北大核心
2005年第S1期64-67,共4页
Journal of Beijing Forestry University
基金
教育部留学回国人员科研启动金资助项目
黑龙江省博士后资助基金项目.
关键词
含水率检测
称重法
测算精度
moisture content measurement, oven drying method, measurement accuracy
