倾斜打击角度推断模型的建立  

Establishment of Inference Model of Oblique Strike Angle

作　　者：王载方 徐兴奇 王震[1] WANG Zaifang;XU Xingqi;WANG Zhen(Criminal Investigation Police University of China,Shenyang 110854,China)

机构地区：[1]中国刑事警察学院,辽宁沈阳110854

出　　处：《科技创新与生产力》2023年第11期115-118,122,共5页Sci-tech Innovation and Productivity

基　　金：中国刑事警察学院研究生创新能力提升项目(2022YCYB34)。

摘　　要：利用自制打击痕迹样本制作仪制作55.0°~87.5°锤击痕迹样本,使用三维表面测量仪采集痕迹之后,对与打击角度相关性较强的特征进行了测量,基于回归分析的方法求取了由痕迹特征推断打击角度的数学模型。特征角与打击角度具有y=0.8855x+103.42的线性关系,并且利用该模型推断的结果与实际角度的偏差最大不超过2.20%,具有可靠性。深度组与宽度组模型所参考的特征受到打击速度变化的影响较大,因此模型的准确性相对较低,平均偏差分别在9.24%和7.03%左右。A sample of 55.0°to 87.5°hammer marks is made with a self-made sample preparation instrument for hammer marks.After collecting the marks with a three-dimensional surface measuring instrument,the characteristics with strong correlation with the strike angle are measured.Based on the method of regression analysis,the mathematical models for inferring the strike angle from the trace characteristics are obtained.The characteristic angle and the strike angle have a linear relationship of y=0.8855x+103.42,and the maximum deviation between the calculated result and the actual angle is not more than 2.20%,which is reliable.The characteristics referenced by the depth group and width group models are greatly affected by the change of the strike speed,so the accuracy of the models is relatively low,with the average deviation of about 9.24% and 7.03%respectively.

关 键 词：痕迹学 倾斜打击 三维测量 推断模型 回归分析 

分 类 号：DF794.1[政治法律—诉讼法学]