| Airplane is one of the important means of modern long-distance transportation.Its main structure is alloy material.Because of the particularity of aircraft in the process of transportation,the diversity of flight attitude during flight and complexity of load,that’s make the structure of aircraft in deformation state at all times.Whether the deformation of the structure is within the allowable range or not is not only relate to the safety of the aircraft itself,but also to the passenger’s lives.Therefore,it is necessary to conduct instantaneous dynamic deformation monitoring in time so obtain the instantaneous dynamic deformation information of the structure.Conventional methods can only monitoring static single point.The automatic monitoring system based on high precision measuring robot is only suitable for local deformation monitoring;Physical sensor measurement needs direct contact with the aircraft,and the monitoring range is local deformation information;The technology of three dimensional laser scanning,it has high accuracy in static monitoring,but the timeliness is slightly poor in instantaneous dynamic monitoring.Fiber Bragg grating sensor,acoustic-ultrasound piezoelectric sensor,vacuum cavity pressure ratio sensor,acoustic emission,environmental degradation monitoring sensor,microwave sensor,intelligent coating,aircraft structure health monitoring system(SHM)and other technologies need direct contact with the aircraft structure.It is more strict for environmental impact compensation technology,sensor packaging,installation requirements in contact measurement.The cost of monitoring aircraft health status is also relatively large,at the same time,it is difficult to implement in the overall structure monitoring.How to monitor the instantaneous dynamic deformation of the aircraft without affecting normal working and reduce the economic cost is the main problem to be solved in this paper.With the deep integration of measurement technology,information technology and computer technology.Taking non-measured digital camera as the data acquisition equipment to collect the image sequence of detected structure,so as to obtain the instantaneous image data of the monitored object.The structuraldeformation monitoring software system is used to calculate the displacement of structure.This paper takes the civil aviation Boeing aircraft as the monitoring object,in the course of the aircraft engine working but still stopping on the tarmac,the high-definition digital camera with distortion correction is fixed in the right position,collecting the image sequence of the aircraft structure,and the displacement curve of the monitored point is obtained by solving the calculation.By fully analyzing the deformation law of the same deformation point in time image sequence under load and the deformation law of different deformation points at the same time.And then achieve the purpose of safety warning of the healthy state of aircraft structure,so as to provide reference data for the design of aircraft structure strength.This article Includes six parts.The first part is social background of the paper and the significance of the study,as well as the development status of digital photogrammetry,and the key research content,innovation points and technical route of the paper;The second part mainly introduces the structure of the aircraft and the stress analysis of the whole aircraft and the wing under different loading conditions;The third chapter is the calculation model of monitoring.It includes the error checking of a camera,image matching-time baseline parallax method for the calculation of deformation data,the error of reference plane and tilt plane correction of the solution model.The fourth part is the collection of experimental data.The points need to attention including reference points,deformation points and the location of photography center during implementation;The fifth part is the calculation and analysis of deformation results;The last part is a summary and prospect of the study. |
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