AFM中受限悬臂梁受迫振动对称性的分析  

Forced Vibration Symmetry Analysis of the Restricted Cantilever in AFM

作　　者：赵爽[1] 翟伟国[1] 张可可[1] 

机构地区：[1]中国船舶重工集团公司第七二五研究所,河南洛阳471023

出　　处：《新技术新工艺》2017年第4期28-31,共4页New Technology & New Process

摘　　要：扫频试验的目的是研究原子力显微镜(AFM)在试验环境下由液桥带来的作用力和能量耗散的变化规律。其中,试验操作手册MFP 3d Manual中给出的悬臂梁振动响应曲线是一条折线,这表明虽然运动过程中悬臂梁只有在向下运动与基底发生接触时,受到液桥力的作用,但是悬臂梁在平衡位置处上下运动的位移大小却一直保持对称形态。为了解释折线的正确合理性,通过试验验证和ABAQUS软件模拟进行说明。在试验过程中收集到的图像表明,自由端的运动形态一直保持简谐运动形式;同时,应用ABAQUS软件进行数值模拟的结果也表明运动具有对称性。从试验和理论两方面对折线的合理性进行了说明。The aim of the sweep-frequency experiment is to obtain the variation regulation of the capillary force and dissipation which is generated in Atomic Force Microscope （AFM） by the liquid bridge in ambient air. Specially, the vibration response curve is a broken line given by the operation instructor MFP 3d Manual. This indicates that the up and down distance of the cantilever based on the balance location is always symmetrical while the free end is only affected by the liquid bridge force when it contacted with the sample downward. We adopt experiment verification and ABAQUS software simulation to explain the validity of the broken line. The picture collected from the experiment indicates that the movement form of the freedom end is simple harmonic motion in the whole vibration process. Meanwhile, the results of the ABAQUS simulation also illustrate that the motion is symmetrical. In summary, the validity of the broken line is demonstrated by the experi ment and the simulation.

关 键 词：扫频试验 对称性 ABAQUS模拟 

分 类 号：O321[理学—一般力学与力学基础]