Reliability Evaluation And Optimization Design Of Key Parts Of Bionic Robotic Fish

As an important platform for seabed exploration and subsea warfare,bionic robotic fish has the advantages of strong mobility,high flexibility,low noise and high safety.At present,propulsion efficiency and component reliability are the key problems restricting the development of bionic robotic fish.In order to make the bionic robotic fish work stably under water for a long time,it is necessary to evaluate and optimize the reliability of its key parts,improve the reliability of the key parts of the bionic robotic fish,and achieve a higher propulsion efficiency of the bionic robotic fish.The paper carried out instantaneous load simulation on the tail fin mechanism of the bionic robotic fish,and loaded the resulting load into the frame mechanism and key transmission shaft mechanism of the bionic robotic fish,and carried out reliability evaluation and optimization design of the frame and transmission shaft.The three-dimensional modeling of the bionic robotic fish was established with the help of the CREO platform.Based on the flapping wing theory,the force analysis of the bionic robotic fish’s tail fin was carried out in the driving straight and turning conditions.The program development of the force analysis was carried out with the software of programming MATLAB,and the instantaneous dynamic load of the tail fin was calculated.Based on the instantaneous dynamic load simulation results,the mechanical system dynamics analysis software ADAMS and finite element analysis software ANSYS WORKBENCH were used to analyze the mechanism dynamics.On the basis of reliability evaluation,the bionic robotic fish frame was lightweight design.After optimization,the stress and strain are reduced by 8.5862% and 6.2268%,respectively,and the weight is reduced by 10.69%.Based on the rigid-flexible coupling virtual prototype technology,combined with the 3D modeling software CREO,ANSYS APDL module and ADAMS software,the rigid-flexible coupling dynamic virtual prototype model of the bionic robotic fish tail-fin transmission mechanism was established.Based on the dynamic simulation analysis results of the coupling model,the mechanical characteristics of the bionic robotic fish tail fin and the reliability of key parts were obtained.With the reliability as the objective function,the optimization design evaluation function was established,and the intelligent algorithm was used to optimize the design,the reliability analysis was carried out by ADAMS and fatigue analysis software n Soft.After optimization,the reliability of the transmission shaft is increased from 0.67003 to 1.0,the initial mode fatigue life of the spline transmission shaft is increased from 3.06E6 to 1.07E10,and the fatigue reliability of the key transmission shaft of the bionic robotic fish is improved.The rigid-flexible coupling virtual prototype technology,lightweight design theory,mechanical reliability design theory and intelligent algorithm are combined to provide a new technical route and data support for the reliability evaluation and optimization design of the bionic robotic fish.