| As a product of cement bags,food bags and other packaging machinery powder(granular)shaped articles,self-developed paper and yarn compounded bag bottom-pasting machine has good market prospect.However,the performance of the components that depend on experience is unknown,and it is difficult to ensure whether the design scheme is optimal.With the rapid development of mechanical industry and virtual prototyping technology,the modern design method of CAD/CAE validating and improving the mechanical properties of product has become the mainstream of mechanical product design.To predict and enhance mechanical properties of paper and yarn compounded bag bottom-pasting machine,the static and dynamic finite element analysis technology and modern structure optimization technology are used to make static analysis and modal analysis of the two key parts,frame and roller component,and also to make fatigue analysis and optimization design of roller component.The main research contents are as follows:According to the requirements of design drawings,3D models of frame and roller component are established in SolidWorks.The study of static characteristics is completed in the finite element software,and the structure performances of the frame and roller components are verified.The analysis results show that the frame design is reasonable and meets the demand.The rocker arm,which is the weakest part of roller component,meets the requirements of strength,but the stress is rich.So it can be further optimized.Based on the fitting structure material S-N curve and fatigue analysis theory,the nominal stress method is adopted for roller components for fatigue analysis.The most vulnerable part is the rocker arm according to the results of fatigue analysis.And the results provide guidance for improving and optimizing the rocker arm of roller component.Based on the static and fatigue analysis,sensitivity analysis method is introduced to determine the optimal design variables of the rocker arm of roller component.Under the constraint of equivalent stress less than 117.5MPa,and quality,fatigue safety factor and equivalent stress of the rocker arm are taken as the optimization goals,the mathematical model is established.The mathematical model of optimization design is established.The response surface model is established based on the DOE experimental design method.The multi-objective optimization design of the rocker arm is finished using multi-objective optimization algorithm,and remarkable optimization results are obtained.The complete testing is completed according to the optimization results.Mechanical properties of the optimized roller component are increased significantly.Modal analysis of frame and optimized roller component are conducted.The natural frequencies and mode shapes are obtained.The low order modal frequency of the frame and the optimized roller component avoid the working frequency of the external excitation source.So the resonance phenomenon will not occur.At the same time,the low order frequency of frame is easily affected by other external influences.To further improve the structure performance,and perfect the design,providing reference for further machine design.Through modal experiment,the natural frequency and mode shape of the rocker arm are obtained.The results are compared with those by the finite element modal analysis.The finite element analysis method is verified,which provides the support for the reliability of the finite element simulation results. |
