一种新型红外傅里叶光谱仪全柔性动镜系统的仿真设计与分析
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摘要
随着红外傅立叶变换光谱仪近年来在许多特殊领域(太空、真空)的广泛应用和快速发展,使用环境因素对其运动机构的可靠性和运动部件的寿命提出了很高的要求。论文第一章介绍了红外傅立叶变换光谱仪的发展状况与动镜机械扫描系统的研究背景,结合在研课题的实际需要,确定了本论文的研究内容——全柔性动镜系统。第二章从研究任务出发,对基于迈克尔逊干涉仪的傅立叶变换光谱仪相关参数进行了分析,包括信息容量、动镜垂直耦合位移等,确定了动镜的基本工作状态。再根据这一状态,具体对动镜机械扫描系统核心部分——柔性支撑机构的运动学原理、柔节的种类和型式进行深入地研究,结合柔性支撑机构的工作原理,设计出新型全柔性动镜机械扫描系统,并给出CAD二维设计图及Solidworks三维模型图。第三章在三维建模的基础上,通过分析软件Patran及Nastran建立全柔性支撑机构的有限元网格模型,根据动镜的工作原理,通过对其进行CAD静力学分析,结果不断反馈优化柔性支撑机构的相关参数,最终获得一较好的仿真结果。与目前国内外类似柔性支撑机构的运动精度相对比,结果表明:该动镜系统的线性运动精度比国内外分别高出93.2%和75.3%。对此仿真结果的柔性支撑机构的最薄弱环节——柔节进行疲劳扭断仿真分析,得到柔节仿真寿命的循环次数为5.83x10~5次,在Nf(1x10~5~1x10~7)范围之内,属于高周疲劳范畴。从理论仿真模拟的角度来验证柔性支撑机构相关参数的合理性,进而加深对该傅里叶光谱仪动镜系统寿命情况的了解。第四章根据仿真优化后的柔性支撑机构的相关参数,进行简化设计并加工出简易动镜系统,并对简易实物进行相关试验测试和实验结果误差分析,从实际试验方面来验证此柔性支撑机构相关参数选择的可行性及整套机构理论分析的正确性。第五章主要围绕着动镜系统的仿真和实测结果,对傅里叶光谱仪动镜系统进行分析总结,结合实际应用环境,提出给一些建议和想法,为以后此类的研究工作打下基础。
In recent years, with the widespread use and rapid development of infrared Fourier transform spectrometer in many specific areas (space, vacuum), environmental factors made very high demands on the reliability of movement mechanism and the lifetime of moving parts. The first chapter introduces the development of infrared Fourier transform spectrometer and the research background of moving mirror mechanical scanning system, and determines the content of this thesis, which is fully compliant moving mirror system, combined with the actual needs of the research project. Starting from the researching task, the second chapter analyzes the relevant parameters of Fourier transform spectrometer based on Michelson interferometer, which includes information capacity,coupling displacement of moving mirror, etc, and determines the basic working condition of moving mirror. Flexible supporting mechanism is core of moving mirror mechanical scanning system. According to the state, kinematics Principle of flexible supporting mechanism and the types and patterns of soft section are studied specifically and deeply. Combined with the compensation theory of flexible supporting mechanism, a new full flexible supporting mechanism with dual compensation rod is designed, and the two-dimensional drawings of CAD and the three-dimensional model diagram of SOLIDWORKS are given. In the third chapter, the finite element mesh models based on the three-dimensional model of full flexible supporting mechanism are established by the analysis software of PATRAN and NASTRAN. According to the working principle of moving mirror, through its static analysis of CAD and continuous feedback and optimization to the relevant parameters of flexible supporting mechanism, ultimately, gets a better simulative result. Compared with similar flexible supporting mechanism at home and abroad, the result shows that the accuracy of this full flexible supporting mechanism, respectively, higher than 93.2% and 75.3%. Soft sections are the weakest parts at the result of full flexible supporting mechanism. With the simulation analysis of fatigue broken to them, its simulation life cycle number is calculated, and it is 5.83x10~5 times, at the range of Nf (1x10~5 ~ 1x10~7), a high fatigue category. Through the theoretical simulation to the full flexible supporting mechanism, the reasonableness of its parameters is verified, and then the understanding of situation about its lifetime is deepened. In the fourth chapter, a simple moving mirror system is designed and made, use the parameters of the optimized result. And then do the related experimental tests on it, the error analysis about results of these tests, to verify that the relevant parameters of the full flexible supporting mechanism are feasibility and the theoretical analysis about the whole mechanism is correct, from the actual test area. In the fifth chapter, mainly around the simulation and experimental results of the moving mirror system, the full flexible supporting mechanism with practical application environment is analyzed and summarized, to put forward a number of proposals and ideas, and lay the foundation for future research.
引文
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