Structural Optimization And Simulation Of Spatial Linkage Weft Insertion Mechanism Of The Weaving Carbon Fiber Loom

Spatial linkage weft insertion mechanism is the core mechanism of the weaving carbon fiber cloth loom.The dynamic performance of the weaving process affects the quality of the carbon fiber cloth.The rapier loom that produces fiber cloth is manufactured in China.There will be problems such as weft breakage,which makes the quality of domestic carbon fiber cloth and foreign products of the same specification have a big gap.This puts forward higher requirements for the dynamic performance of the weft insertion mechanism of the domestic woven carbon fiber rapier loom.In this thesis,through the establishment of a virtual prototype of spatial linkage weft insertion mechanism,the finite element method is used to analyze the dynamic characteristics of the weft insertion mechanism,and the optimization design method is applied to the base and the space link.The main contents and results of the research are as follows:1.Establish a model of weft insertion mechanism in Pro/E.Through dynamic analysis in ADAMS,the movement law curve of the rapier was obtained and verified.Due to the low shear resistance of carbon fiber and the large inertial force that causes the weft yarn to break,it is proposed to add rollers to reduce the peak of the acceleration curve of the rapier,thereby reducing the inertial force,improving the performance of the weft insertion mechanism,and improving the structure before and after Part of the strength comparison analysis.The analysis result shows that the peak value of the acceleration curve is reduced by 11.11%,indicating that the rolling contact has a significant influence on the peak value of the acceleration curve of the rapier,and the stress of the kendo is reduced by 36%compared with the original,indicating that the improvement of the mechanism is feasible.2.Using the force at the hinge of the base obtained in ADAMS,a finite element model of the base was established in ANSYS Workbench,and its topology optimization was optimized for the first time,and the pre-stress modal and fatigue analysis were redesigned,and finally multi-target optimization was achieved.The results showed that the weight was reduced by 9.33%after two optimizations;the fatigue safety factor was increased by 17%from the redesigned model through multi-objective optimization,achieving high performance in weight reduction and fatigue resistance.3.Considering the deformation of the spatial linkage,the spatial linkage is structured in Hypermesh,and the.cdb file is generated and then imported into ANSYS.The modal neutral file is generated through the APDL editing command stream,and the flexible link is imported into ADAMS for rigidity.Flexible coupling dynamic analysis.The analysis results show that,compared with the completely rigid mechanism,except for the larger fluctuations in the initial rotation,there is no fluctuation during the operation of the mechanism,which indicates that the flexible spatial linkage has less influence on the movement of the entire mechanism.4.Use the OptiStruct software in Hypermsh to first optimize the topology of the spatial linkage with the unit density as the design variable and the volume fraction as the objective function,and then redesign in Pro/E to complete the strength check;finally,use the rain flow algorithm for fatigue analysis,Complete fatigue life optimization.The results show that the volume fraction is reduced from 0.9 to 0.54 by topology optimization,which is a 40%reduction;the fatigue optimized life is increased from 7.83×10~5 times to 2.46×10~6times,which meets the requirements of lightweight and long life.