| Due to its unique advantages in practical engineering,flexible cantilever beams have gradually become an important part of microelectronic systems(MEMS),aerospace,construction engineering and bridges.For the structural failure of the flexible cantilever beam under actual working conditions,complicated structure and parameter uncertainty,This paper proposes a new method to apply the saliency of each design parameter of the structure to the structural optimization design,so that the flexible cantilever beam can achieve lightweight effect,reduce material loss and production cost,and enhance its bearing.Performance,to prevent the effect of buckling failure,Providing a theoretical basis for future engineering design,The thin wall flexible cantilever beam is used as the research object to carry out the following work:(1)For the buckling failure of the thin-walled flexible cantilever beam itself,firstly,the linear buckling analysis of the closed rectangular thin-walled flexible cantilever beam is carried out with the finite element software ANSYS Workbench.Combined with the arc length method and then subjected to nonlinear buckling analysis,the error between the two is small;Secondly,the comparative analysis of the types of flexible cantilever beams provides a basis for the selection of cantilever beams;Finally,the buckling failure analysis of closed rectangular thin-walled flexible cantilever beam and circular thin-walled flexible cantilever beam is carried out to find out the influencing factors of buckling failure and analyze the causes of buckling failure,which lays a foundation for preventing buckling failure.(2)Aiming at the buckling problem of thin-walled flexible cantilever beam in engineering machinery,a closed rectangular thin-walled flexible cantilever beam is taken as an example.The force analysis is carried out under the applied load,and the theoretical derivation formula of the critical value is obtained.The force analysis is carried out under the applied load,and the theoretical derivation formula of the critical value is obtained.Then the linear buckling analysis is carried out with the finite element ANSYS Workbench software.The critical value of the buckling simulation is compared with the theoretical critical value to verify the accuracy of the theoretical formula.Then the orthogonal experiment design is introduced.The orthogonal design of the design parameters of the cantilever beam is used as the controllable factor.Combined with the visual analysis and the weight analysis,the weight of each design parameter on the critical value is quantitatively analyzed.Finally,significant weighting is performed.Sex test.Experiments show that the size parameter affects the critical value of the change weight,and there are significant factors and non-significant factors,which provides a theoretical basis for the optimal design of the size parameter.(3)For the design problem of the closed rectangular thin-walled flexible cantilever beam structure,the closed rectangular thin-walled flexible cantilever beam is taken as an example under the actual supporting seat condition.Firstly,the static analysis and dynamic analysis of the support seat are carried out,and the maximum stress and displacement deformation of the closed rectangular thin-walled flexible cantilever beam under the support seat are obtained.The support seat is satisfied under the yield limit and the maximum displacement deformation.Topology Optimization.The results show that the mass is relatively reduced when the maximum stress and displacement deformation are satisfied,but the critical force is reduced,and the result of preventing buckling failure is not achieved.Furthermore,the size optimization design of the closed rectangular thin-walled flexible cantilever beam is carried out.The results show that the mass is reduced and the critical value is increased under the condition of satisfying the maximum stress and the maximum displacement deformation,and the buckling failure and structure are prevented.To optimize the design effect,the corresponding measures to prevent buckling failure are also proposed. |
