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Design and Finite Element Analysis of Background Objective Measurer

Author: ZhaoHuaZhen
Tutor: DongHuiJuan；ZhangQiZuo
School: Harbin Institute of Technology
Course: Mechanical and Electronic Engineering
Keywords: Background / objective measuring instrument Modal Analysis Harmonic Response Analysis Thermodynamic Analysis
CLC: TH74
Type: Master's thesis
Year: 2007
Downloads: 61
Quote: 0
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Abstract


Background / objectives Gauge is a precision optical instrument used in the space environment, the main function is to measure the background of the Earth's atmosphere and target parameters, reference data provide a basis for future missile warning satellite. Background / objective measuring instrument is based on infrared satellite platform real-time transmission of reconnaissance camera equipment, it can be real-time reconnaissance, identification, tracking the enemy flying missile, missile flight data in a short period of time to obtain. Therefore, the background / target measurement instrument of great significance to enhance China's national defense capabilities. As a star on the load, the measuring instrument must do the structure is compact, lightweight and reliable. Taking into account the emission process in the system must undergo harsh mechanical environments, structural design to achieve high stiffness, high strength, low-quality. In this paper, based on technical indicators and environmental requirements of the optical system, the first preferred material of the lens barrel, and then design the structure of the two sets of barrel. Elaborate on the main components of the design idea and implementation of key points in each set of programs. Comprehensive comparison of the advantages and disadvantages of the two options, the final choice of modular barrel program as the implementation of the program; cameras at the same time bearing member - backplane detailed structural design, to meet the performance requirements of the entire camera. The application of three-dimensional structural design software UG barrel modules and backplane precise shape, mold mounted the quality of the lens barrel components and the whole of the center of mass and moment of inertia of the important structural parameters. For the three-dimensional model of the barrel assembly interference checking, modifying the unreasonableness of the design. In the whole of the three-dimensional model based on the finite element analysis software ANSYS static analysis. Analog transmission environment 15g overload analysis on the model to draw the maximum deformation and the maximum stress in the structure of the static force, the stiffness and strength of the authentication system. Barrel structure and the whole modal analysis, drawn to the natural frequencies and modes of the system, not only to verify the reliability of the structure, but also provides a basis to improve the dynamic characteristics of the measuring instrument. Harmonic response analysis of analog transmission in sinusoidal vibration of the lens barrel structure, draw the corresponding displacement and velocity curve. Taking into account the high stability requirements of the optical system, in order to further reduce the deformation of the lens barrel structure of the elastic damping layer is provided in the lens barrel supporting position to obtain a good damping effect, in the simulation analysis. Finally, the whole structure of thermodynamics, the heat source and the thermal expansion coefficient of the material structure system, provides a theoretical basis for the implementation of the thermal control programs.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Instruments, meters > Optical instruments
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