Technology Research On The Flexible Displacement Platform With High-precision And Large Stroke

The flexible displacement mechanism plays an important role in precisepositioning and displacement technology.Flexible mechanism transfers energy, forceor motion through the deformation of the flexible components. Compared with therigid mechanisms, the movement of flexible mechanism is continuous and thestructure is compact, etc, which makes it become a hot research direction in precisemechanical design field. Type synthesis of the flexible component and the mechanismstructure are the decisive factors which determine its performance directly.For the common flexible displacement platform have some disadvantages ofsmall stroke and complex structures, the design and analysis of flexible displacementmechanism with high-precision and large stroke are carried out in this paper. Themain contents are:1. The performance of the typical existing flexible components is analyzed.Force model of the flexible batten is established and analyzed using different methods.The configuration of flexible mechanism synthesis methods are introduced and a newtype synthesis method based on vector operations is proposed for the design of theone-dimensional flexible mechanism. Three criteria are put forward in the design offlexible mechanism. Rigid components and kinematic pairs are introduced to theflexible design in order to offset the coupled displacement and achieve high-precisionone-dimensional linear motion.2. On the basis of stiffness analysis of the flexible board, research is carried outon flexible board size and other factors, which influence the stiffness of the flexibledisplacement platform. Stiffness change of the platform is analyzed when the load istension or pressure respectively. The finite element method is used to verify the stiffness characteristics of the platform.3. The kinetic and potential energy of the flexible batten is calculated to establishthe dynamic equation of the flexible batten, and then deduced the dynamic equation ofthe platform displacement. The finite element analysis software is used for the modalanalysis to obtain the former six-order modal shape and frequency. Material typesand the flexible board size and other factors which affect the natural frequency of theplatform are discussed. The stress-life model is used to predict the fatigue life of theplatform.4. The platform error sources are analyzed and error models of straightness andcoupled displacement are established to show the impact of various parameters on theplatform performance. Experiments are carried out to measure the straightness andcoupled displacement, which prove that the designed platform works with highmotion accuracy and meets the design requirement.