The Experts below are selected from a list of 255 Experts worldwide ranked by ideXlab platform

Yimin Shao - One of the best experts on this subject based on the ideXlab platform.

  • the effect of a localized fault in the planet bearing on vibrations of a Planetary Gear Set
    Journal of Strain Analysis for Engineering Design, 2018
    Co-Authors: Jing Liu, Yimin Shao, Huifang Xiao
    Abstract:

    Dynamic characteristics of a Planetary Gear Set can be greatly affected by a localized fault in the planet bearing. To understand the relationship between the dynamic characteristic of the planetar...

  • effects of the Gear eccentricities on the dynamic performance of a Planetary Gear Set
    Nonlinear Dynamics, 2018
    Co-Authors: Zheng Cao, Yimin Shao, Meng Rao
    Abstract:

    Gear eccentricities are one of the practical types of the manufacturing errors that affect the dynamic performance of a Planetary Gear train (PGT). Previous research about the effects of the Gear eccentricities is abundant, and many of them focus on the parallel shaft Gear Set. However, almost none of them have considered the influence of the Gear eccentricities on the mesh stiffness. In fact, the existence of the Gear eccentricities can change the center distance and the mesh positions of a meshing Gear pair, which will directly affect the mesh stiffness. Situation can be even more complex for the PGT with either sun Gear eccentricities or planet Gear eccentricities or both of them. Based on that, a new dynamic model of a PGT with Gear eccentricities is established. The planar motions of the PGT and the mesh stiffness are integrated and solved simultaneously where the mesh stiffness is determined by the actual mesh positions of the meshing Gear pair. The mesh stiffness is calculated by the energy potential method. The time-varying center distance caused by the Gear eccentricities is also considered, which can result in the change of line of action, pressure angle, contact ratio and mesh positions. The influence of Gear eccentricities on the dynamic performance of a 4-planet PGT is studied. Some useful results are derived at last.

  • dynamic and quasi static modeling of Planetary Gear Set considering carrier misalignment error and varying line of action along tooth width
    Proceedings of the Institution of Mechanical Engineers Part C: Journal of Mechanical Engineering Science, 2015
    Co-Authors: Zheng Cao, Yimin Shao, Ming J Zuo, Xihui Liang
    Abstract:

    Misalignment error of Gear pair will affect the load distribution along the tooth-width and have a great effect on dynamic characteristics. For the Planetary Gear Set, it is complicated to model th...

  • dynamic simulation of Planetary Gear Set with flexible spur ring Gear
    Journal of Sound and Vibration, 2013
    Co-Authors: Zaigang Chen, Yimin Shao, D Su
    Abstract:

    Abstract Ring Gear is a key element for vibration transmission and noise radiation in the Planetary Gear system which has been widely employed in different areas, such as wind turbine transmissions. Its flexibility has a great influence on the mesh stiffness of internal Gear pair and the dynamic response of the Planetary Gear system, especially for the thin ring cases. In this paper, the flexibility of the internal ring Gear is considered based on the uniformly curved Timoshenko beam theory. The ring deformation is coupled into the mesh stiffness model, which enables the investigation on the effects of the ring flexibility on the mesh stiffness and the dynamic responses of the Planetary Gear. A method about how to synthesize the total mesh stiffness of the internal Gear pairs in multi-tooth region together with the ring deformation and the tooth errors is proposed. Numerical results demonstrate that the ring thickness has a great impact on the shape and magnitude of the mesh stiffness of the internal Gear pair. It is noted that the dynamic responses of the Planetary Gear Set with equally spaced supports for the ring Gear are modulated due to the cyclic variation of the mesh stiffness resulted from the presence of the supports, which adds more complexity in the frequency structure.

  • dynamic features of Planetary Gear Set with tooth plastic inclination deformation due to tooth root crack
    Nonlinear Dynamics, 2013
    Co-Authors: Yimin Shao, Zaigang Chen
    Abstract:

    Gear tooth root crack, as one of the popular Gear tooth failures, is always caused by the dynamic load or excessive load applied to the tooth. It will devastate the working performance of the Gear system, by problems such as vibration and noise, or even lead to a broken tooth, which will stop the normal working process of the Gear system. It has attracted wide attention from researchers. However, the previous studies focused their concentration only on the mesh stiffness reduction due to tooth root crack, while the tooth plastic inclination due to tooth bending damages like Gear tooth root crack is seldom considered. In this paper, a tooth plastic inclination model for spur Gear with tooth root crack is developed by regarding the cracked tooth as a cantilever beam. It influences not only the displacement excitation but also the mesh stiffness and load-sharing factor among tooth pairs in mesh. The simulation results obtained by incorporating the tooth plastic inclination deformation model together with the tooth root crack model into a 21-Degree-of-Freedom Planetary Gear dynamic model indicate that the tooth plastic inclination has a significant effect on the performance of the Gear system rather than the mesh stiffness reduction due to tooth root crack.

Xuefeng Chen - One of the best experts on this subject based on the ideXlab platform.

  • time varying mesh stiffness calculation of a Planetary Gear Set with the spalling defect under sliding friction
    Meccanica, 2020
    Co-Authors: Wei Luo, Zhixian Shen, Baijie Qiao, Zhibo Yang, Xuefeng Chen
    Abstract:

    Time-varying mesh stiffness (TVMS) is an important excitation source of a Planetary Gear Set. Sliding friction and spalling defects have significant effect on the TVMS. Accurate evaluation of the TVMS can help obtain the vibration characteristics and further detect the spalling defects of the Planetary Gear Set. In this paper, an improved analytical model is proposed to calculate the TVMS of the Planetary Gear Set with sliding friction by considering the tooth profile beginning with the root circle. Then the impact of spalling defects on the TVMS is investigated. The results show that the improved analytical model can increase the precision of the TVMS. Besides, the effect of sliding friction and spalling defects on the TVMS is significant. This study offers a basis for dynamic performance analysis of a Planetary Gear Set with spalling defects under sliding friction.

  • dynamic modeling of Planetary Gear Set with tooth surface wear
    Procedia Manufacturing, 2020
    Co-Authors: Zhixian Shen, Baijie Qiao, Laihao Yang, Wei Luo, Ruqiang Yan, Xuefeng Chen
    Abstract:

    Abstract Wear commonly occurs in Planetary Gear transmission systems. Fundamentally, the tooth wear could cause tooth profile deviation, which would increase the vibration and noise of Gearbox. In order to monitor and forecast the wear condition of Gears via vibration-based methods, it is necessary to establish the dynamics model of a Planetary Gear Set with tooth surface wear, which can provide a prior about the vibration characteristics of Gear wear. In this study, a purely torsional dynamics model of a Planetary Gear Set with tooth surface wear is proposed to analyze the fault mechanism of tooth surface wear. The tooth surface wear is incorporated into the dynamics model through unloaded static transmission error (USTE) and time-varying mesh stiffness (TVMS), which are evaluated by Archard’s wear equation. Subsequently, the vibration responses of the Planetary Gear Set with tooth surface wear are analyzed. It is revealed that tooth wear would change the vibration responses in both time- and frequency-domain and the condition indicators present different trends.

  • evaluating the influence of tooth surface wear on tvms of Planetary Gear Set
    Mechanism and Machine Theory, 2019
    Co-Authors: Zhixian Shen, Baijie Qiao, Laihao Yang, Xuefeng Chen
    Abstract:

    Abstract Time-varying mesh stiffness (TVMS), one of the most important parameters in Gear dynamics, is usually used to analyze the influence of Gear fault in Gear transmission systems. In this study, a modified TVMS model is proposed to quantitatively evaluate the influence of the tooth wear on the mesh stiffness. In this model, the potential energy method is employed to calculate the mesh stiffness and the Archard's wear equation is adopted to calculate the tooth wear depth. Furthermore, the analytical expression of the modified mesh stiffness considering the tooth wear is theoretically derived, which can be used for a variety of tooth wear models. The modified TVMS model is applied in a Planetary Gear Set, including the sun-planet mesh and the planet-ring mesh. The results of numerical simulation demonstrate that the tooth wear can result in the reduction of the mesh stiffness; for a Planetary Gear Set, in the initial wear process, the mesh stiffness decreases proportionally when the tooth wear depth increases.

Zaigang Chen - One of the best experts on this subject based on the ideXlab platform.

  • dynamic simulation of Planetary Gear Set with flexible spur ring Gear
    Journal of Sound and Vibration, 2013
    Co-Authors: Zaigang Chen, Yimin Shao, D Su
    Abstract:

    Abstract Ring Gear is a key element for vibration transmission and noise radiation in the Planetary Gear system which has been widely employed in different areas, such as wind turbine transmissions. Its flexibility has a great influence on the mesh stiffness of internal Gear pair and the dynamic response of the Planetary Gear system, especially for the thin ring cases. In this paper, the flexibility of the internal ring Gear is considered based on the uniformly curved Timoshenko beam theory. The ring deformation is coupled into the mesh stiffness model, which enables the investigation on the effects of the ring flexibility on the mesh stiffness and the dynamic responses of the Planetary Gear. A method about how to synthesize the total mesh stiffness of the internal Gear pairs in multi-tooth region together with the ring deformation and the tooth errors is proposed. Numerical results demonstrate that the ring thickness has a great impact on the shape and magnitude of the mesh stiffness of the internal Gear pair. It is noted that the dynamic responses of the Planetary Gear Set with equally spaced supports for the ring Gear are modulated due to the cyclic variation of the mesh stiffness resulted from the presence of the supports, which adds more complexity in the frequency structure.

  • dynamic features of Planetary Gear Set with tooth plastic inclination deformation due to tooth root crack
    Nonlinear Dynamics, 2013
    Co-Authors: Yimin Shao, Zaigang Chen
    Abstract:

    Gear tooth root crack, as one of the popular Gear tooth failures, is always caused by the dynamic load or excessive load applied to the tooth. It will devastate the working performance of the Gear system, by problems such as vibration and noise, or even lead to a broken tooth, which will stop the normal working process of the Gear system. It has attracted wide attention from researchers. However, the previous studies focused their concentration only on the mesh stiffness reduction due to tooth root crack, while the tooth plastic inclination due to tooth bending damages like Gear tooth root crack is seldom considered. In this paper, a tooth plastic inclination model for spur Gear with tooth root crack is developed by regarding the cracked tooth as a cantilever beam. It influences not only the displacement excitation but also the mesh stiffness and load-sharing factor among tooth pairs in mesh. The simulation results obtained by incorporating the tooth plastic inclination deformation model together with the tooth root crack model into a 21-Degree-of-Freedom Planetary Gear dynamic model indicate that the tooth plastic inclination has a significant effect on the performance of the Gear system rather than the mesh stiffness reduction due to tooth root crack.

  • dynamic simulation of Planetary Gear with tooth root crack in ring Gear
    Engineering Failure Analysis, 2013
    Co-Authors: Zaigang Chen, Yimin Shao
    Abstract:

    Abstract Planetary Gear is widely used in different areas due to its advantages such as compactness, large torque-to-weight ratio, large transmission ratios, reduced noise and vibrations. However, the tooth faults like cracks are seldom concentrated. In this paper, a mesh stiffness model of internal Gear pair with a tooth root crack in the ring Gear is derived based on the potential energy principle. The mesh stiffness model is incorporated into the dynamic model of a one-stage Planetary Gear Set with 21-degree-of-freedom (DOF) to investigate the effect of the internal Gear tooth root crack. The crack cases with different dimensions are designed in this paper to demonstrate their influences on the mesh stiffness and the dynamic performance of the Planetary Gear Set. The simulated results show that bigger reduction in mesh stiffness is caused by the growth in the crack size. And the impulsive vibrations and sidebands can be observed in the dynamic response of the Planetary Gear Set in time and frequency domains, respectively. Both their amplitudes increase as the crack propagation which supply the possibility for them to be the indicators in the condition monitoring and fault diagnosis of Planetary Gear system.

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

  • model based analysis and fault diagnosis of a compound Planetary Gear Set with damaged sun Gear
    Journal of Mechanical Science and Technology, 2018
    Co-Authors: Xihui Liang
    Abstract:

    The vibration properties of compound Planetary Gears are more complicated than that of simple ones. This paper aims to investigate the fault properties of a compound Planetary Gear Set in chipped sun Gear conditions using model-based method. A three-dimensional lumped-parameter nonlinear dynamic model for the compound Planetary Gear Set is established. This model considers the time-varying mesh stiffness (TVMS), the mesh phase relations, and Gear chipping defects. The analytical equations are derived to quantify the TVMS reduction induced by the chipped Gear based on the improved potential energy method. Further, the simulations are performed to demonstrate the fault features of sun Gears with single or multiple chipped teeth in different Gear stages. Moreover, the theoretical derivations are validated through the experimental signals analysis.

  • vibration signal modeling of a Planetary Gear Set with transmission path effect analysis
    Measurement, 2016
    Co-Authors: Libi Liu, Xihui Liang, Ming J Zuo
    Abstract:

    Abstract For a Planetary Gear Set, the transducer-perceived vibration signal contains vibration information from multiple sources including the sun Gear, planet Gears, and the ring Gear. All these vibration sources are subject to corresponding transmission path effects. In this paper, a comprehensive vibration signal model for a Planetary Gear Set is proposed considering all the vibration sources and transmission path effects. Vibration sources were generated with a nonlinear two-dimensional lumped-parameter dynamic model. Transmission path effects are modeled as two parts: the part inside the Gearbox to the casing and the other part along the casing to the transducer position. Given the Gear sizes, the transmission path effect modeling parameters are estimated. Then the influences of different transmission paths on resultant vibration signals are analyzed. Some vibration characteristics are revealed for one healthy Planetary Gear Set. These vibration characteristics are validated with lab experimental data in both time domain and frequency domain.

  • dynamic and quasi static modeling of Planetary Gear Set considering carrier misalignment error and varying line of action along tooth width
    Proceedings of the Institution of Mechanical Engineers Part C: Journal of Mechanical Engineering Science, 2015
    Co-Authors: Zheng Cao, Yimin Shao, Ming J Zuo, Xihui Liang
    Abstract:

    Misalignment error of Gear pair will affect the load distribution along the tooth-width and have a great effect on dynamic characteristics. For the Planetary Gear Set, it is complicated to model th...

  • vibration signal modeling of a Planetary Gear Set for tooth crack detection
    Engineering Failure Analysis, 2015
    Co-Authors: Xihui Liang, Mohammad R. Hoseini
    Abstract:

    Abstract In a Planetary Gearbox, there are multiple vibration sources, and the transmission path of vibration signals changes due to the rotation of the carrier. This study aims to model the vibration signals of a Planetary Gearbox and investigate the vibration properties in the healthy condition and in the cracked tooth condition. A dynamic model is developed to simulate the vibration source signals. A modified Hamming function is proposed to represent the effect of the transmission path. By incorporating the effect of multiple vibration sources and the effect of transmission path, resultant vibration signals of a Planetary Gearbox are obtained. Through analyzing the resultant vibration signals, some vibration properties of a Planetary Gearbox are revealed and the fault symptoms of sun Gear tooth crack are identified and located. Finally, the proposed approach is experimentally verified.

  • Understanding vibration properties of a Planetary Gear Set for fault detection
    2014 International Conference on Prognostics and Health Management, 2014
    Co-Authors: Xihui Liang, Mohammad R. Hoseini
    Abstract:

    This paper investigates the vibration properties of a Planetary Gear Set. A two-dimensional lumped mass model is developed to simulate the vibration signals of a Planetary Gear Set in the perfect and crack situations. Through dynamic simulation, the vibration signals of each individual component can be simulated, including the vibration signals of the sun Gear, each planet Gear, and the ring Gear. By incorporating the effect of transmission path, resultant vibration signals of the Gearbox at the transducer location are obtained. Results show obvious fault symptoms in the signals of an individual component, such as the sun Gear. After going through the transmission path, amplitude modulation is shown in the resultant vibration signals. When there is a crack on a sun Gear tooth, a large amount of sidebands appears in the vibration spectrum. The locations of these sidebands are investigated and identified, which are helpful for fault detection.

Stefano Di Cairano - One of the best experts on this subject based on the ideXlab platform.

  • MPC-based energy management of a power-split hybrid electric vehicle
    IEEE Transactions on Control Systems Technology, 2012
    Co-Authors: Hoseinali Borhan, Anthony M. Phillips, Ming L Kuang, Ardalan Vahidi, Ilya V. Kolmanovsky, Stefano Di Cairano
    Abstract:

    A power-split hybrid electric vehicle (HEV) combines the advantages of both series and parallel hybrid vehicle architectures by utilizing a Planetary Gear Set to split and combine the power produced by electric machines and a combustion engine. Because of the different modes of operation, devising a near optimal energy management strategy is quite challenging and essential for these vehicles. To improve the fuel economy of a power-split HEV, we first formulate the energy management problem as a nonlinear and constrained optimal control problem. Then two different cost functions are defined and model predictive control (MPC) strategies are utilized to obtain the power split between the combustion engine and electrical machines and the system operating points at each sample time. Simulation results on a closed-loop high-fidelity model of a power-split HEV over multiple standard drive cycles and with different controllers are presented. The results of a nonlinear MPC strategy show a noticeable improvement in fuel economy with respect to those of an available controller in the commercial Powertrain System Analysis Toolkit (PSAT) software and the other proposed methodology by the authors based on a linear time-varying MPC.