An S-N curve fitting approach is proposed based on the weighted least square method, and the weights are inversely proportional to the length of mean confidence intervals of experimental data sets. The assumption coin...An S-N curve fitting approach is proposed based on the weighted least square method, and the weights are inversely proportional to the length of mean confidence intervals of experimental data sets. The assumption coincides with the physical characteristics of the fatigue life scatter. Two examples demonstrate the method. It is shown that the method has better accuracy and reasonableness compared with the usual least square method.展开更多
提出了一种基于手持式激光测距仪的大尺寸测量系统及方法.分别通过以手持式激光测距仪和增最式光电编码器为核心的测距及测角单元获得目标测量点的极坐标;再南运动控制器、驱动器、执行电机等构成的伺服控制系统,带动测距仪完成工件的...提出了一种基于手持式激光测距仪的大尺寸测量系统及方法.分别通过以手持式激光测距仪和增最式光电编码器为核心的测距及测角单元获得目标测量点的极坐标;再南运动控制器、驱动器、执行电机等构成的伺服控制系统,带动测距仪完成工件的扫描测量;然后在极坐标系下利用最小二乘拟合法进行数据处理,并对一钢质圆环内径进行了测量,测量半径标准差为0.2mm.最后,研究了多站组合测量模式及坐标配准方法.Abstract：A large -scale measurement system based on a portable laser range finder is presented, which acquires the range and angle information by means of laser range finder and incremental photoelectric enceder. Under the control of servo system consisting of motion eontroller、driver and executive motor, the scanning measurement of the work-piece is implemented. Then, the data is processed using least squares fit and inner diameter measurement of steel circular ring was carried out, with the standard deviation of the radius 0. 2 mm. At last, the combined measurement and coordinate registration algorithm is studied.展开更多
文摘An S-N curve fitting approach is proposed based on the weighted least square method, and the weights are inversely proportional to the length of mean confidence intervals of experimental data sets. The assumption coincides with the physical characteristics of the fatigue life scatter. Two examples demonstrate the method. It is shown that the method has better accuracy and reasonableness compared with the usual least square method.
文摘提出了一种基于手持式激光测距仪的大尺寸测量系统及方法.分别通过以手持式激光测距仪和增最式光电编码器为核心的测距及测角单元获得目标测量点的极坐标;再南运动控制器、驱动器、执行电机等构成的伺服控制系统,带动测距仪完成工件的扫描测量;然后在极坐标系下利用最小二乘拟合法进行数据处理,并对一钢质圆环内径进行了测量,测量半径标准差为0.2mm.最后,研究了多站组合测量模式及坐标配准方法.Abstract：A large -scale measurement system based on a portable laser range finder is presented, which acquires the range and angle information by means of laser range finder and incremental photoelectric enceder. Under the control of servo system consisting of motion eontroller、driver and executive motor, the scanning measurement of the work-piece is implemented. Then, the data is processed using least squares fit and inner diameter measurement of steel circular ring was carried out, with the standard deviation of the radius 0. 2 mm. At last, the combined measurement and coordinate registration algorithm is studied.
