激光多普勒测振仪在炸药加载冲量测量中的应用  

Application of Laser Doppler Vibrometer in Impulse Mesurement of Explosive Loading

作　　者：毛勇建[1] 李春枝[1] 王懋礼[1] 刘新民[1] 何颖波[1] 何荣建[1] 周擎[1] 胡绍全[1] 黄海莹[1] 

机构地区：[1]中国工程物理研究院结构力学研究所,四川绵阳621900

出　　处：《实验力学》2005年第B12期114-118,共5页Journal of Experimental Mechanics

摘　　要：在采用炸药加载模拟锥壳结构遭受X射线辐照的结构响应实验中，利用激光多普勒测振仪测量了锥壳表面特征点的水平方向速度曲线。并从载荷的侧向余弦分布特点出发，推导了根据锥壳刚体运动的质心水平方向初速计算加载比冲量峰值的公式。同时根据锥壳表面的质点运动特征，提出了截取结构响应基本结束之后的曲线段进行算术平均，通过理论计算修正得到锥壳刚体运动的质心水平方向初速的数据处理方法。最后给出并分析了测量结果，结果表明：采用激光多普勒测振仪可以测量炸药加载下结构的刚体运动速度，从而可进一步计算分析结构受到的栽荷大小，其精度可以满足工程测量的要求。In the structural response simulation experiment by explosion loading that the cone shell suffers the radiation of impulse X-ray, a Laser Doppler Vibrometer is used to measure the horizontal velocity curve of a special point on external surface of the shell. A formula for calculating the peak specific impulse through the initial horizontal rigid velocity of the center of mass is derived according to sine distribution of the lateral impulse load. Referring to motion characteristics of mass points on the shell surface, a segment of velocity curve after structural responses is intercepted, and its arithmetic mean value is used to reform the initial horizontal rigid velocity according to theoretical calculation, then the peak specific impulse is calculated. At last, the measured results are presented and analyzed. The results show that Laser Doppler Vibrometers can be used in measuring rigid velocities of structures under explosion loading to calculate and analyze the load values, and the accuracy can meet the requirements of engineering measurements.

关 键 词：炸药加载 结构响应 激光多普勒测振仪 冲量测量 

分 类 号：O347.1[理学—固体力学] O434.14[理学—力学]