The purpose of this paper is to propose a pair of external and internal spiral bevel gears with double circular-arc in the nutation drive. Based on the movement of nutation, this paper develops equations of the tooth profiles for the gear set, leading to the mathematical modeling of the spiral bevel gear with a constant helical angle gear alignment curve, enabling the tooth surface to be generated, and permitting the theoretical contacting lines to be produced in light of the meshing function. Simulation and verification are carried out to prove the mathematical equations. Numerical control (NC) simulation of machining the external and internal double circular-arc spiral bevel gears is developed, and the spiral gears were manufactured on a NC milling machine. The prototype of the nutation drive is illustrated in the case study at the end of this paper.
Based on the nutation movement of a rotating coin on a table, the formulae for calculating the transmission ratio between two nutation gears is developed. The tooth profile with a double circular arc for helical bevel gears in nutation drives is proposed and then the meshing equation during the nutation process and the universal equation of the crown gear tooth surface with helical double
circular arc profiles are obtained based on the gear meshing theory. Further, the modeling for nutation drives with the proposed profile is carried out in a virtual working process.
This document conducts simulation analysis on spherical anti-seismic bearing employing the Finite Element Methods and PSD analysis of random vibration based on modal analysis, from which results as statistical parameters of random vibration of structure and demonstrates: this specific anti-seismic spherical bearing satisfies industry security demands related.
Buckling analysis is a technique used to determine buckling load and buckled mode shape. Buckling load is the critical load at which a structure becomes unstable while buckled mode shape is the characteristic shape associated with a structure's buckled response. In this paper, the elastic thermal buckling of a heated cyclic symmetry structure is carried out by means of finite element method. The buckling cyclic symmetry analysis is focused on a ring-strut-ring structure which is extensively used as a basic element in rotating machines. The linear eigenvalue buckling analysis is adopted to determine the buckling response with the temperature change of the structure.
In order to optimize the structure of steel tube arched bridge, the parameterized model of steel tube arched bridge shall be established on the basis of APDL of ANSYS finite element. based on the huge computational power of ANSYS and the flexibility of APDL parameterization language, choose width of longitudinal beam, radius of arch ring and radius of suspender as design variables, regard maximum deflection and maximum stress as state variables, and take total volume as objective function. Realize structure optimization analysis of steel tubular arched bridge via parameterization computation.
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