摘要
落锤试验机的冲击速度是一个瞬时量,基于冲击前一刻的距离和时间计算平均速度进行近似是目前常用的测量方法。但该方法需传感器具有较高的响应速度,才能准确捕捉落锤冲击瞬间的位置信息,导致研发成本较高。为了摆脱测量原理对传感器响应速度的依赖,本文基于落锤的下落特性及理论分析,提出一种基于轨迹的冲击速度测量方法和轨迹函数的约束条件。实验证明:与传统测量方法相比,该方法测量精度和测量不确定度均有大幅提升。
The impact velocity of the drop hammer testing machine is an instantaneous quantity,and it is a com⁃monly used measurement method to approximate the average velocity based on the distance and time before impact.However,this method requires the sensor to have a high response speed in order to accurately capture the position information at the moment of impact of the drop hammer,resulting in high research and development cost.In order to get rid of the dependence of the measurement principle on the response speed of the sensor,based on the falling characteristics and theoretical analysis of the drop hammer,a trajectory based impact velocity meas⁃urement method and the constraint conditions of the trajectory function are proposed in this paper.Experimental re⁃sults show that the measurement accuracy and uncertainty of this method are greatly improved compared with the traditional measurement method.
作者
刘全红
王景凡
毛斌
山立根
刘辉
LIU Quanhong;WANG Jingfan;MAO Bin;SHAN Ligen;LIU Hui
出处
《计量与测试技术》
2023年第9期1-5,共5页
Metrology & Measurement Technique
基金
国家自然科学青年基金(项目编号:52105274)
陕西省教育厅专项科研计划项目(项目编号:21JK0902)
陕西省自然科学基础研究计划(项目编号:2022JQ-386)。
关键词
落锤冲击试验机
冲击速度
自由落体
轨迹拟合
约束最小二乘
drop hammer testing machine
impact velocity
free fall
trajectory fitting
constrained least squares
