Stability of energy transmission device and system of gear box, Nanjing Precision Engineering Co., ltd

by:NJPE     2020-02-12
In the process of manufacturing, the gear box is used as an energy transmission device widely used in its mechanical equipment, in the process of design, its level reflects the country's comprehensive national strength and industrial technology level to a certain extent. With the rapid development of science and technology, people have put forward higher requirements for gearbox in high speed, high power, light weight, low vibration, low noise, etc. For the high-speed gear box on the centrifugal compressor unit, due to its high rotating speed and complex working environment. The gear box body can make the box body bear the vibration from the gear meshing impact while supporting and positioning the gear transmission, and the box body can be used as an important basic part in the gear transmission system, its performance directly affects the stability of the gear system, so it becomes more important to study the dynamic and static performance of the gear box. The gearbox can simplify the establishment of models for the upper, middle and lower three boxes of the box body in the three-dimensional modeling, and complete the overall assembly. Using the seamless docking function of CAD and CAE, the simplified model of the gear box is imported into ANSYS to complete the establishment of the finite element model of the box structure. Through the stress analysis and calculation of the gear box under rated working conditions, the load loading and boundary condition setting of the finite element model are completed, and the analysis results of the static characteristics of the gear box can be obtained, the maximum deformation and ultimate equivalent stress of the box structure are obtained. The modal analysis of the gear box is carried out, and the first ten modal frequencies and corresponding vibration modes in the analysis structure are extracted, and then the rotation frequency and meshing frequency of each transmission gear in the gear box are compared, evaluate the reliability of the dynamic performance of the original design, and find out the main factors and action parts that cause the overall vibration of the box. The gear box is mainly based on the static and dynamic characteristics analysis results of the high-speed gear box, and its design objectives are selected to a certain extent, and seven design variables are selected. Through the multi-objective design theory, the relationship between the multi-objectives is balanced, and the multi-objective structural optimization design of the gear box is completed under the permitted constraints of the overall stiffness and strength of the box.
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