Dynamic analysis of optical imaging electro-system

Abstract

An Optical Imaging Electro-System (OIES) is an equipment used to capture images from a long range in the form of electromagnetic radiations and convert them into electrical signals which are then transferred to a system where these signals are converted for visual display. These systems are always operated in an environment exposed to wind gust, shocks, earthquakes, etc. The optical systems are sensitive to these effects and the equipment housing the system must tolerate these effects. In the present work, study is carried out on dynamic behavior such as Modal, Harmonic and Shock analysis of the external body which houses the OIES. Several iterations are carried out by making changes in geometry (varying thickness, inclusion of stiffeners, etc.) and material (Aluminium 2024, Aluminium 7075 and Titanium alloy). The CAD models are developed using ANSYS SPACECLAIM and analysis was carried out using ANSYS workbench software. Natural frequencies of the system are obtained from modal analysis and are used for harmonic and shock analysis. Natural Frequencies obtained for mode 1 to mode 10 are in the range of 69 Hz to 313 Hz for different models. In harmonic analysis, the deformation, stress and acceleration response of the frequencies are studied. From Harmonic analysis, deformation in X axis is found to be 1.71 mm to 6.75 mm, stress of 1.33 MPa to 26.36 MPa for different models. In Shock analysis, the behavior of the natural frequencies is studied under the influence of shock loads. The model that is best suited for the operation is selected by considering all the factors.