Nonlinear Finite Element Solution of Passive Constant Force Mechanism Based on Displacement Control Method
The passive constant force mechanism(CFM)without drive control is of great significance for non-destructive harvesting of fruits and vegetables.Adopting topology optimization methods can reduce design difficulties of these mechanisms,which relies on nonlinear finite element analysis.For the finite element analysis(FEA)in optimization iteration,the introduction of geometric nonlinearity from large structural deformation and material nonlinearity from the adopted hyperelastic materials is considered,and a two-dimensional mesh model and a balanced iteration equation under displacement load input are established.For the equation solving,the displacement control method(DCM)is used and compared with analog algorithms based on differential equation solving methods.The result shows that the algorithm proposed in this paper has high efficiency and accuracy in solving nonlinear problems with such displacement inputs.And such method can provide a numerical calculation basis for the topology optimization design of constant force clamping mechanisms in the future.
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