航空精密制造技术
航空精密製造技術
항공정밀제조기술
AVIATION PRECISION MANUFACTURING TECHNOLOGY
2015年
3期
1-4,31
,共5页
廖然%李旦%陈明君%张文明%肖勇
廖然%李旦%陳明君%張文明%肖勇
료연%리단%진명군%장문명%초용
大口径%检测平台%模态分析%气浮%柔性铰链
大口徑%檢測平檯%模態分析%氣浮%柔性鉸鏈
대구경%검측평태%모태분석%기부%유성교련
large-aperture Optics%inspection stage%modal analysis%air bearing%flexible hinge
针对大口径光学元件检测平台,利用ANSYS 软件建立其有限元模型并进行模态仿真,获得前6阶固有频率与振型,并通过模态试验分析获得频域内传递函数。计算模态分析与试验模态分析结果基本一致,表明模型建立正确可靠。以建立的有限元模型为基础,选取气浮支撑刚度及柔性铰链结构参数作为变量,进行模态仿真,研究其对平台固有频率的影响。结果表明,气浮支撑刚度对平台整体固有频率影响小于1.5%,柔性铰链簧片厚度对其影响大于20%,可通过选择合理厚度改善平台的动态特性。
針對大口徑光學元件檢測平檯,利用ANSYS 軟件建立其有限元模型併進行模態倣真,穫得前6階固有頻率與振型,併通過模態試驗分析穫得頻域內傳遞函數。計算模態分析與試驗模態分析結果基本一緻,錶明模型建立正確可靠。以建立的有限元模型為基礎,選取氣浮支撐剛度及柔性鉸鏈結構參數作為變量,進行模態倣真,研究其對平檯固有頻率的影響。結果錶明,氣浮支撐剛度對平檯整體固有頻率影響小于1.5%,柔性鉸鏈簧片厚度對其影響大于20%,可通過選擇閤理厚度改善平檯的動態特性。
침대대구경광학원건검측평태,이용ANSYS 연건건립기유한원모형병진행모태방진,획득전6계고유빈솔여진형,병통과모태시험분석획득빈역내전체함수。계산모태분석여시험모태분석결과기본일치,표명모형건립정학가고。이건립적유한원모형위기출,선취기부지탱강도급유성교련결구삼수작위변량,진행모태방진,연구기대평태고유빈솔적영향。결과표명,기부지탱강도대평태정체고유빈솔영향소우1.5%,유성교련황편후도대기영향대우20%,가통과선택합리후도개선평태적동태특성。
Modal simulation is performed by building finite element model on large-aperture optics inspection stages by using ANSYS, and first six natural frequencies and mode shapes are acquired. Related modal experiments are performed to verify its result, proving the validity of simulation analysis. In order to improve stiffness of stages, flotation support stiffness and flexible hinge structure parameters are chosen as variables, to study their effects on the natural frequency of the stages. The result shows that flotation support stiffness has effect less than 1.5% on stages stiffness, while thickness of flexible hinge has significant effect more than 20%, which can be chosen to optimize dynamic characteristic of the stages.