大型降落伞抽打现象的录像分析方法  

Analysis of Large Parachute's Bullwhip Phenomenon Based on Video Image Processing

作　　者：郭鹏[1] 王立武[2] 秦子增[1] 郭叔伟[3] 

机构地区：[1]国防科技大学航天与材料工程学院,长沙410073 [2]北京空间机电研究所,北京100076 [3]辽宁葫芦岛海军飞行学院,葫芦岛125001

出　　处：《航天返回与遥感》2012年第2期7-15,共9页Spacecraft Recovery & Remote Sensing

基　　金：国家部委资助项目(2009HK10015)

摘　　要：文章提出一种利用单台无姿态信息摄像机拍摄的空投录像来分析大型降落伞抽打现象的方法,利用图像处理方法得到拉直结束后降落伞中轴线,并将之近似为相互连接的直线段,并以降落伞结构参数作为先验信息求解拉直结束后伞衣位形,同时采用静态测量及单摆试验测量方法验证了分析方法的有效性,最后对有无抽打现象产生两段大型伞空投试验录像进行分析。分析表明,抽打发生时,伞衣顶部摆动剧烈,持续时间长,两帧间平均速度较大,分析结果可为抽打现象的理论研究提供数据验证。The paper presents a method for analysis of large parachute＇s bullwhip phenomenon based on a single camera＇s video image processing.Firstly,the deployed parachute＇s axis is obtained as connected lines,and the canopy＇s shape and location could be calculated according to the parachute＇s geometry.And then,the applicability of the method is proved by a parachute model measurement and a simple pendulum＇s video measurement.Finally,the numerical results of two different flight-test videos,with or without bullwhip phenomenon are given.The comparison shows that when bullwhip occurres,the canopy would get a higher frequency,longer swing,and the mean velocity between two consecutive frames of the canopy＇s apex is faster.The conclusion was helpful for theoretical research.

关 键 词：抽打现象 空投试验 图像分析 降落伞 

分 类 号：V476.2[航空宇航科学与技术—飞行器设计]