摘要
为了提高光学天线在微振动环境下的动力学特性,优化光学系统的成像质量,可以将自由阻尼层喷涂在次镜支撑薄梁的表面来达到减振降噪的目的。首先通过Zemax以及Minitab确定微振时次镜离焦对成像质量的影响,在此基础上分析了自由阻尼层减振的原理并在时域上对次镜的离焦量进行了数学建模。其次,通过Ansys进行瞬态动力学分析,提取时域上次镜的离焦量后用Matlab进行曲线拟合并与所得数学模型的曲线进行对比。分析结果表明,在0.2 g量级的正弦扰动下,铝合金制光学天线支撑结构表面喷涂0.5 mm厚的NiCrAlY自由阻尼层材料时,光学天线最大离焦量降低了21.9%,有效地提高了光学系统的抗振特性和成像质量。
In order to improve the dynamic characteristics of the optical antenna in the micro-vibration environment and optimize the imaging quality of the optical system,the free damping layer can be sprayed on the surface of the secondary mirror supporting thin beam to achieve the purpose of vibration and noise reduction.Firstly,Zemax and Minitab are used to determine the influence of secondary mirror defocusing on imaging quality.On this basis,the principle of free damping layer vibration reduction is analyzed and the defocusing amount of secondary mirror is mathematically modeled in time domain.Secondly,the transient dynamic analysis is carried out by Ansys,the defocusing amount of the secondary mirror in time domain is extracted,and the curve is fitted by Matlab and compared with the curve of the mathematical model.The analysis results show that the maximum defocusing amount of the optical antenna is reduced by 21.9%when 0.5 mm thick NiCrAlY free damping layer is sprayed on the surface of the aluminum alloy optical antenna support structure under 0.2 g sinusoidal disturbance,which effectively improves the anti-vibration characteristics and imaging quality of the optical system.
作者
王佳男
孟立新
张立中
王劲凯
WANG Jianan;MENG Lixin;ZHANG Lizhong;WANG Jinkai(School of Mechanical and Electrical Engineering,Changchun University of Science and Technology,Changchun 130022,China;Key Laboratory of Air Ground Laser Communication for National Defense,Changchun University of Science and Technology,Changchun 130022,China)
出处
《激光杂志》
CAS
北大核心
2023年第6期17-23,共7页
Laser Journal
基金
国家自然科学基金(No.U2141231)
吉林省教育厅科学技术研究项目(No.JJKH20210836KJ)。
关键词
阻尼减振
动力学分析
自由阻尼层
次镜支撑结构减振
成像质量
damping vibration attenuation
dynamic analysis
free damping layer
vibration reduction of secondary mirror support structure
imaging quality
