| As a new type of movable teeth transmission structure,the double shock sleeve movable teeth transmission not only has the advantages of transmitting power line contact,high transmission efficiency,strong bearing capacity,compact structure and wide range of transmission ratios,but also overcomes the lack of additional dynamic load in the rotating process of eccentric circular shock absorber.In this paper,the tooth profile analysis,transmission characteristic analysis,force analysis,fuzzy reliability analysis,dynamic modeling and dynamic characteristic analysis of double shock wave sleeve movable teeth transmission were carried out.According to the structure and principle of the movable teeth transmission,the theoretical tooth profile and working tooth profile of the central wheel were deduced;the influence of the tooth profile parameters such as transmission ratio,movable tooth radius,cam base circle radius and offset on the shape property of the central gear was analyzed,and the value relation of the tooth profile parameters was established on the premise that the working tooth profile of the central gear does not interfere.Regardless of the rotation of the movable teeth,the change curve of the circular center speed and the swing angle speed of the movable teeth were draw,the sliding rate of the meshing pair was calculated,the influence of the tooth shape parameters on the sliding rate was analyzed.Considering the non-linear relationship between load and deformation and the influence of the hollowness of the movable tooth on the deformation,a nonlinear mechanical model of the meshing pair was established,and the changes of each meshing force and the influencing factors were analyzed.Aiming at the fuzzy reliability problem of the double shock wave tooth transmission,an improved response surface method based on intelligent algorithm was proposed.Based on fuzzy theory,the intelligent algorithm was combined with the reliability analysis method,and the Monte Carlo sampling method was used to train the network to establish an improved response surface method model.Using the stress-strength interference theory,the input torque,elastic modulus,Poisson's ratio,and working tooth length of the movable tooth drive were used as input random variables,and the contactstrength was used as input fuzzy variables to establish an interference reliability model.The calculation and comparison through different methods showed that the improved response surface method improves the calculation efficiency and accuracy of reliability analysis.Considering the time variability of strength and membership function,a dynamic fuzzy reliability model was established based on the fuzzy reliability theory,and an improved response surface method was used to calculate dynamic fuzzy reliability.The effects of intensity degradation,failure correlation and failure ambiguity on dynamic reliability were studied.Based on the established fuzzy reliability model,the fuzzy reliability analysis was combined with the global sensitivity analysis method,and a dynamic fuzzy reliability global sensitivity design method was proposed,and the change law of the global fuzzy reliability global sensitivity of each structural parameter was given,and the influence degree of the uncertainty of the parameter on the reliability was analyzed.Aiming at the problem of the finite-length line contact between the movable tooth and the raceway,a non-Hertz line contact solution model was established,and the meshing normal force and time-varying meshing stiffness of each meshing pair were calculated.Taking into account factors such as clearance,time-varying stiffness and error,the 26-degree-of-freedom translation-torsion coupled dynamic model of the double shock sleeve movable tooth transmission system was used to derive the system dynamic differential equation and the Newmark method was used to solve the time-domain response.The effects of various errors on dynamic characteristics were analyzed by displacement time history curve,phase diagram,power spectrum diagram and Poincare section diagram. |
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