【摘要】：視頻測量技術(shù)通過攝像機記錄被測結(jié)構(gòu)的振動過程,采用圖像處理方法實現(xiàn)對結(jié)構(gòu)上測點的多目標跟蹤,具備全場非接觸、測試過程簡便、測量精度高等突出優(yōu)點�；跀z像機成像模型,采用光束法平差提取出結(jié)構(gòu)測點三維方向位移振動信息,每個測點等效于一個三軸"微位移傳感器",對多測點目標跟蹤可視為多通道同步數(shù)據(jù)采集。對攝像機成像系統(tǒng)進行校準,依照結(jié)構(gòu)形狀特性分布測點,由結(jié)構(gòu)靜止時各測點的空間位置構(gòu)建出測試結(jié)構(gòu)的幾何模型,進行視頻采集和多目標跟蹤獲取各測點動態(tài)響應(yīng)數(shù)據(jù),采用運行狀態(tài)模態(tài)分析方法,識別出被測結(jié)構(gòu)的固有模態(tài)參數(shù)。基于視頻測量實現(xiàn)了測試結(jié)構(gòu)幾何建模和信號采集,并與模態(tài)分析軟件緊密結(jié)合,形成了完整的視頻采集與分析系統(tǒng),具備良好的空間域展現(xiàn)能力,特別適用于柔性低頻結(jié)構(gòu)的動態(tài)測試與分析。以輕質(zhì)風扇葉片、若干樹葉等結(jié)構(gòu)為對象進行實驗研究,驗證了該技術(shù)和方法的有效性。
[Abstract]:The video measurement technology records the vibration process of the structure measured by video camera, and uses the image processing method to realize the multi-target tracking of the measuring points on the structure. It has the outstanding advantages of full-field non-contact, simple test process and high measurement precision. Based on the camera imaging model, the three-dimensional directional displacement vibration information of structural measuring points is extracted by beam method adjustment. Each measuring point is equivalent to a three-axis "micro-displacement sensor", and tracking multi-point target can be regarded as multi-channel synchronous data acquisition. The camera imaging system is calibrated, the measuring points are distributed according to the shape characteristics of the structure, the geometric model of the test structure is constructed from the spatial position of each measuring point when the structure is still, and the dynamic response data of each measuring point are obtained by video capture and multi-target tracking. The inherent modal parameters of the tested structure are identified by using the running state modal analysis method. Based on video measurement, geometric modeling and signal acquisition of test structure are realized, and combined with modal analysis software, a complete video acquisition and analysis system is formed, which has a good display ability in spatial domain. It is especially suitable for dynamic testing and analysis of flexible low frequency structures. The effectiveness of the technique and method is verified by the experimental study of light fan blades and some leaf structures.
【作者單位】： 南京航空航天大學機械結(jié)構(gòu)力學及控制國家重點實驗室;
【基金】：航空科學基金(20161352011)
【分類號】：TP391.41

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