The Experts below are selected from a list of 27 Experts worldwide ranked by ideXlab platform

Tianhong Luo - One of the best experts on this subject based on the ideXlab platform.

  • Generation and Meshing Analysis of a New Type of Double Helical Gear Transmission
    Hindawi Limited, 2018
    Co-Authors: Dong Liang, Tianhong Luo
    Abstract:

    A study on the Double Helical Gear transmission with curve element constructed tooth pairs is carried out in this paper. Generation and mathematical model of tooth profiles are proposed based on the geometric relationship. Tooth profiles equations are derived considering the developed equidistance-enveloping approach. Design of tooth profiles with point contact is conducted and numerical example is illustrated. And the solid models of Double Helical Gear pair with curve element constructed tooth pairs are established. Computerized design and meshing simulation are also put forward. Furthermore, stress analysis of the Gear pair is conducted and Gear prototypes are manufactured using CNC machining technology. Further tooth contact analysis, dynamic and experimental studies on transmission properties of Gear prototypes will be carried out

Ying Wang - One of the best experts on this subject based on the ideXlab platform.

  • Dynamic modeling of Double-Helical Gear with Timoshenko beam theory and experiment verification
    SAGE Publishing, 2016
    Co-Authors: Jincheng Dong, Sanmi Wang, Ying Wang
    Abstract:

    In the dynamic study of the Double-Helical Gear transmission, the coupling shaft in the middle of the two Helical Gears is difficult to be handled accurately. In this article, the coupling shaft is treated as the Timoshenko beam elements and is synthesized with the lumped-mass method of the two Helical Gear pairs. Then, the numerical integration method is used to solve the amplitude–frequency responses and dynamic factors under diverse operating conditions. A Gear vibration test rig of closed power circuit is developed for in-depth experimental measurements and model validation. After comparing the theoretical data with the practical results, the following conclusions are drawn: (1) the dynamic model with the Timoshenko beam element is quite appropriate and reliable in the dynamic analysis of Double-Helical Gear transmission and is of great theoretical value in the accurate dynamic research of the Double-Helical Gear transmission. (2) In both theoretical analysis and experimental measurements, the dynamic factors of Gear pair diminish with the increase in the input torque and augment with the increase in the input speed. (3) The deviation ratio of the theoretical data and the experimental results decrease with the increase in the input torque, reaching the minimum at the highest input speed

Hua Su - One of the best experts on this subject based on the ideXlab platform.

  • Theoretical and experimental studies on dynamics of Double-Helical Gear system supported by journal bearings
    Advances in Mechanical Engineering, 2016
    Co-Authors: Minghu Yin, Guoding Chen, Hua Su
    Abstract:

    The dynamic behaviour of a Double-Helical Gear system supported by journal bearings is theoretically and experimentally investigated in this study. A bending–torsional–axial coupling model for dynamic analysis of Double-Helical Gear system is developed. Influence of the time-varying mesh stiffness and damping is considered. Oil film stiffness and damping of the supporting journal bearing are supposed to be time-varying, and the time-varying oil film stiffness and damping are pre-dicted by a back propagation neural network, which is optimized by genetic algorithm. A Double-Helical Gear–rotor–jour-nal bearing system test rig is also established to carry out the experimental investigations, such as the dynamic transmission errors of Gear pairs. The comparisons between theoretical and experimental results show that the time-varying oil film dynamic coefficients of journal bearings are an important internal excitation. The theoretical model with time-varying oil film stiffness and damping can predict the Gear dynamics more accurate than the model with time-invariant oil film stiffness and damping, and the neural network optimized by genetic algorithm can obtain the time-varying oil film stiffness and damping efficiently and accurately for the dynamic analysis of Double-Helical Gear system.

Rodríguez Jorge Daniel - One of the best experts on this subject based on the ideXlab platform.

  • Análisis modal y propiedades de vibración de engranaje planetario helicoidal doble
    2019
    Co-Authors: Rodríguez Jorge Daniel
    Abstract:

    [ES] Los engranajes planetarios son usados en un amplio rango de sectores como el automovilísti-co, el de los aerorreactores o el de los aerogeneradores, debido fundamentalmente a su alta densidad de potencia y grado de compacidad. Para sacar partido a la ventaja de los engrana-jes helicoidales en términos de menores esfuerzos, evitando la absorción de fuerzas axiales por parte de los cojinetes, los engranajes helicoidales dobles representan una solución viable. Con el propósito de estudiar el comportamiento dinámico de tales sistemas de engranajes, se desarrolla un modelo analítico paramétrico para obtener las frecuencias naturales y modos de vibración de engranajes planetarios con número variable de satélites y distinta geometría. Tal modelo incluye la posibilidad de definir errores comunes de fabricación y ensamblado, como excentricidades en el planeta o en la corona, errores de posicionamiento de los satélites y errores en la geometría. Se evalúan, a través del modelo desarrollado, la excitación y el comportamiento dinámico de un engranaje de cinco satélites, empleado en el banco de en-sayo de engranajes del Gear Research Centre. Los resultados obtenidos se comparan con las medidas experimentales de las aceleraciones en el banco de ensayo, para validar el mo-delo analítico.[EN] Planetary Gear sets are used in a wide range of applications such as in the automotive sector, aircraft engines and wind turbines due to the high-power density and compactness. To utilize the advantage of Helical Gears in terms of less mesh excitation but to avoid a bearing ar-rangement for absorbing axial forces, Double-Helical Gear sets represent a suitable solution. In terms of comfort and operational safety, it is mandatory to investigate the dynamic behavior of such Gearboxes. For this purpose, a parametric analytical model to calculate the eigenfre-quencies and eigenmodes of planetary Gear sets with variable planet number and Gear geom-etry will be developed. This model includes the possibility to define common manufacturing and assembly errors, such as eccentricities of sun Gear, ring Gear or carrier, planet positioning errors and Gear geometry errors. The excitation and vibration behavior of a Double-Helical planetary Gear set with five planets, that is also used in the FZG (Gear Research Centre) planetary Gearbox back-to-back test rig, will also be evaluated with the developed model. Calculation results are compared with experimental measurement of the acceleration from the test rig to validate the analytical model.Rodríguez Jorge, D. (2019). Análisis modal y propiedades de vibración de engranaje planetario helicoidal doble. http://hdl.handle.net/10251/127135TFG

Dong Liang - One of the best experts on this subject based on the ideXlab platform.

  • Generation and Meshing Analysis of a New Type of Double Helical Gear Transmission
    Hindawi Limited, 2018
    Co-Authors: Dong Liang, Tianhong Luo
    Abstract:

    A study on the Double Helical Gear transmission with curve element constructed tooth pairs is carried out in this paper. Generation and mathematical model of tooth profiles are proposed based on the geometric relationship. Tooth profiles equations are derived considering the developed equidistance-enveloping approach. Design of tooth profiles with point contact is conducted and numerical example is illustrated. And the solid models of Double Helical Gear pair with curve element constructed tooth pairs are established. Computerized design and meshing simulation are also put forward. Furthermore, stress analysis of the Gear pair is conducted and Gear prototypes are manufactured using CNC machining technology. Further tooth contact analysis, dynamic and experimental studies on transmission properties of Gear prototypes will be carried out