The Design Of Mechanical Structure And Dynamic Analysis On Space Miniature CCD Camera

The space miniature CCD camera, which is equipped on the artificial satellite, can be used to observe the earth. Because of the advantages of real-time, self-scanned, compact-structure, fast-speed, wild-view and non-airspace-limit, this camera has been paid widespread attention to of many countries. It has remarkable social and economic benefit. Accompanying with the development of the moonlet, more and more countries join the research and development ranks of CCD camera. Compared with other CCD camera, the camera studied in this paper can adapt with many complicated environment during the transportation, launching, injection and orbital motion. So, in the condition of vibrant environment, the structural design of CCD camera and its position precision is becoming the key task in this paper.Regarding this camera design's specification, this paper has completed the following work in camera's structural design process. 1) By analysis the materials performance of the camera, the job of lightweight design of the component had been done. 2) With the finite element analysis method and the structure dynamics theory, the modal analysis has been carried on the lens cone and bridge piece. Then, the improvement suggestion is proposed. The simplified CCD model has been carried on the base of the precise CAD model. Afterword, the FEA model of whole mechanism has been established. Then the structure dynamic characteristic analysis has been computed. The main research works in this paper are listed as followings: 1) establish the FEA model on the base of some principles; 2) achieve the value of deformation and stress according to the static analysis of dead load and over loading; 3) achieve the value of inherence frequency and modal shapes according to the modal analysis; 4) achieve the response curve, the max value of acceleration and the relevant frequency according to the responsive computation of sinusoidal vibration on appraisal grade; 5) achieve the response curve, the max value of acceleration and the relevant frequency according to the responsive computation of random vibration on appraisal grade.The result indicates: 1)the design of structure and weight of the camera, which studies regarding this paper, can reach the request of operating condition; 2)after the improvement of the lens cone and the bridge piece, the camera has a better dynamic stiffness and intensity to guarantee the imaging quality; 3)resonating possibility can be avoided because the fundamental frequency of the camera is much higher than the vibrational frequency of the satellite; 4)the results of the static and dynamics analysis indicate that this camera can resist the influence of the vibration in spatial environment, because the intensity and the range of frequency responds is accepted in the experimental request.