Planetary gear transmission is an important device that is widely used in the field of mechanical transmission.It is mainly composed of a central gear,planetary gears and an internal gear ring,and has many significant...Planetary gear transmission is an important device that is widely used in the field of mechanical transmission.It is mainly composed of a central gear,planetary gears and an internal gear ring,and has many significant advantages,such as a high transmission ratio,compact structure and high efficiency.The new planetary gear transmission system—Next Generation Wheelwork(NGW)—is a distinctive type among them.Due to its advantages such as high stability and low noise,it is widely used.This paper focuses on the NGW planetary gear transmission.Based on the design parameters of its gear system part,the transmission ratio is determined,and parameters such as the number of gear teeth,tooth width,module,and pressure Angle are calculated.The NGW gear transmission structure was three-dimensional modeled and assembled using UG12.0 to obtain the designed planetary gear transmission model.Then,dynamic analysis was conducted to determine the feasibility of the NGW planetary gear transmission system.Through dynamic analysis,the motion characteristics,load distribution,stress distribution,etc.of the gear transmission system are evaluated to optimize the design,improve the performance and service life of the system,and ultimately obtain a set of planetary gear transmission systems that meet the requirements.展开更多
Accurately controlling the nodal lines of vibrating structures with topology optimization is a highly challenging task.The major difficulties in this type of problem include a large number of design variables,the high...Accurately controlling the nodal lines of vibrating structures with topology optimization is a highly challenging task.The major difficulties in this type of problem include a large number of design variables,the highly nonlinear and multi-peak characteristics of iteration,and the changeable orders of eigenmodes.In this study,an effective material-field series-expansion(MFSE)-based topology optimization design strategy for precisely controlling nodal lines is proposed.Here,two typical optimization targets are established:(1)minimizing the difference between structural nodal lines and their desired positions,and(2)keeping the position of nodal lines within the specified range while optimizing certain dynamic performance.To solve this complex optimization problem,the structural topology of structures is first represented by a few design variables on the basis of the MFSE model.Then,the problems are effectively solved using a sequence Kriging-based optimization algorithm without requiring design sensitivity analysis.The proposed design strategy inherently circumvents various numerical difficulties and can effectively obtain the desired vibration modes and nodal lines.Numerical examples are provided to validate the proposed topology optimization models and the corresponding solution strategy.展开更多
基金supported by the 2024 Youth Research Project of Geely University,"Design and Tooth Force Analysis of 20CrMnTiNGW Planetary Gear Transmission"(2024xzkqp025)with the support of the first industry-education integration project of Geely University(Approval Number:2025XOGY015).
文摘Planetary gear transmission is an important device that is widely used in the field of mechanical transmission.It is mainly composed of a central gear,planetary gears and an internal gear ring,and has many significant advantages,such as a high transmission ratio,compact structure and high efficiency.The new planetary gear transmission system—Next Generation Wheelwork(NGW)—is a distinctive type among them.Due to its advantages such as high stability and low noise,it is widely used.This paper focuses on the NGW planetary gear transmission.Based on the design parameters of its gear system part,the transmission ratio is determined,and parameters such as the number of gear teeth,tooth width,module,and pressure Angle are calculated.The NGW gear transmission structure was three-dimensional modeled and assembled using UG12.0 to obtain the designed planetary gear transmission model.Then,dynamic analysis was conducted to determine the feasibility of the NGW planetary gear transmission system.Through dynamic analysis,the motion characteristics,load distribution,stress distribution,etc.of the gear transmission system are evaluated to optimize the design,improve the performance and service life of the system,and ultimately obtain a set of planetary gear transmission systems that meet the requirements.
基金supported financially by the Guangdong Basic and Applied Basic Research Foundation,China(Grant No.2022A1515240059)the National Natural Science Foundation of China(Grant No.52275237)the Shenzhen Stability Support Key Program in Colleges and Universities of China(Grant No.GXWD20220817133329001).
文摘Accurately controlling the nodal lines of vibrating structures with topology optimization is a highly challenging task.The major difficulties in this type of problem include a large number of design variables,the highly nonlinear and multi-peak characteristics of iteration,and the changeable orders of eigenmodes.In this study,an effective material-field series-expansion(MFSE)-based topology optimization design strategy for precisely controlling nodal lines is proposed.Here,two typical optimization targets are established:(1)minimizing the difference between structural nodal lines and their desired positions,and(2)keeping the position of nodal lines within the specified range while optimizing certain dynamic performance.To solve this complex optimization problem,the structural topology of structures is first represented by a few design variables on the basis of the MFSE model.Then,the problems are effectively solved using a sequence Kriging-based optimization algorithm without requiring design sensitivity analysis.The proposed design strategy inherently circumvents various numerical difficulties and can effectively obtain the desired vibration modes and nodal lines.Numerical examples are provided to validate the proposed topology optimization models and the corresponding solution strategy.
