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浙江大学学报（农业与生命科学版）
Journal of Zhejiang University (Agriculture and Life Sciences)  2018, Vol. 44 Issue (4): 459-464    DOI: 10.3785/j.issn.1008-9209.2018.07.170
    
Analysis of sawing strategy and sawing angle for log automatic sawing and angle regulation machine based on infrared detection
DONG Qiuhuang1,2, CHENG Qiansheng1,2, QIU Rongbin1,2, YE Dapeng1,2*
(1. College of Mechanical and Electronic Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, China; 2. Fujian Engineering Research Center for Modern Agricultural Equipment, Fuzhou 350002, China)
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Abstract  In order to improve the automation and processing efficiency of log sawing equipment and ensure the output rate of log sawing, an automatic sawing and turning concept prototype was designed based on infrared detection. Algorithms of sawing strategy and sawing angle were analyzed, and the test platform for log outline detection device was applied to verify the proposed algorithms. The log outline detection device adopted an infrared distance measuring sensor to detect the eight-position parameters uniformly distributed on the outer contour of an arbitrary cross-section of the log. The polygon composed of eight points could approximately represent the outer contour of the log cross- section. Approximate octagonal profiles with different axial crosssections were clipped with the Weiler-Atherton algorithm, and the least square method was used to fit the clipped polygon into elliptical effective regions. The result showed the ellipse fit well with the profile of the cross-section of the log small-end. It is suggested that the sawing strategy and sawing angle calculation method based on the fitted ellipse are feasible for the sawing analysis of logs with less curvature and taper.

Key words： log sawing      infrared detection      sawing strategy      sawing angle     
Published: 11 September 2018
CLC:  S 777  
  TP 216  
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DONG Qiuhuang
CHENG Qiansheng
QIU Rongbin
YE Dapeng
Cite this article:

DONG Qiuhuang, CHENG Qiansheng, QIU Rongbin, YE Dapeng. Analysis of sawing strategy and sawing angle for log automatic sawing and angle regulation machine based on infrared detection. Journal of Zhejiang University (Agriculture and Life Sciences), 2018, 44(4): 459-464.

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http://www.zjujournals.com/agr/10.3785/j.issn.1008-9209.2018.07.170     OR     http://www.zjujournals.com/agr/Y2018/V44/I4/459


基于红外检测的原木自动化锯切翻转机锯切策略及锯切角度分析

为提高原木锯切装备的自动化程度和加工效率，同时保证原木锯切的出材率，设计了基于红外检测的原木自动化锯切翻转概念样机，分析了原木锯切策略和锯切角度算法，并搭建了原木外轮廓检测装置试验台来对上述计算算法进行验证。原木外轮廓检测装置采用红外测距传感器检测原木任意横截面外轮廓上均匀分布的8 点位置参数，这8 个点组成的多边形可近似表征原木截面的外轮廓，轴向不同截面的近似八边形轮廓用Weiler-Atherton 算法裁剪，并进一步用最小二乘法将裁剪得到的多边形拟合成椭圆形的有效利用区域。结果表明，拟合椭圆与原木小头截面外轮廓形状的吻合度较高，依据该拟合椭圆提出的锯切策略和锯切角度计算方法，对于弯曲度和锥度较小的原木锯切分析具有可行性。

关键词： 原木锯切,  红外检测,  锯切策略,  锯切角度 
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