A dynamic gear load distribution model for epicyclic gear sets with a structurally compliant planet carrier

Ryali, Lokaditya; Talbot, David

doi:10.1016/j.mechmachtheory.2022.105225

Cited by 13 publications

(3 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Zhang et al [18] employed a concentrated mass method to establish a translationalrotational dynamic model for a planetary gear system, analyzing the natural frequencies and mode characteristics of a coaxial counter-rotating helicopter main gearbox. Ryali et al [19] developed a hybrid planet dynamic load distribution model, employing finite element substructuring techniques to ensure computational efficiency and investigated the influence of planet carrier flexibility on the quasi-static and dynamic responses of planetary gear sets. Lai et al [20] proposed a flexible-rigid coupling dynamics (FRCD) model for Ravigneaux planetary gear sets (RPGS) with unloaded floating sun gears and studied the influence of the sun gear position on planet dynamic responses, revealing the mechanism of floating ring gear vibration.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Dynamic Characteristics of Coaxial Counter-Rotating Planetary Transmission System

Yue,

Chen,

et al. 2024

Applied Sciences

View full text Add to dashboard Cite

This paper presents a coaxial counter-rotating planetary transmission system. The transmission system under study is a two-stage planetary gear train (PGT) comprising a fixed-axes PGT and a differential PGT. A dynamic model of the transmission system is established, considering both the excitations caused by the time-varying mesh stiffness (TMS) and the transmission errors, respectively. The Runge–Kutta algorithm is used to calculate and analyze the dynamic characteristics of the system. This includes studying dynamic meshing forces, planet gear displacements, and load-sharing coefficients (LSCs) under both internal and external excitations, as well as different input torques. The results indicate that when considering external excitations, the variations in the meshing force curves become more pronounced. The radial displacements of the planet gears in the differential PGT are greater than that in the fixed-axes PGT. With increasing input torque, the average displacements of the planet gears in all directions tend to increase. The differential PGT, transmitting a higher power, demonstrates a better load-sharing performance compared to the fixed-axes PGT.

show abstract

Section: Introductionmentioning

confidence: 99%

Analysis of the Dynamic Characteristics of Coaxial Counter-Rotating Planetary Transmission System

Yue,

Chen,

et al. 2024

Applied Sciences

View full text Add to dashboard Cite

show abstract

“…Yang et al [10] discussed the effects of operating parameters and structural parameters on the load-sharing characteristic of planetary gear systems. Ryali et al [11] built a hybrid planetary dynamic load distribution model and studied the effects of planet carrier flexibility on both the quasistatic and dynamic response of planetary gear sets. Che et al [12] investigated the influence of the bolt constraint parameters on the dynamic characteristic of the planetary gear transmission system.…”

Section: Introductionmentioning

confidence: 99%

Effect of Floating Support Parameters on the Load-Sharing Performance of EDPGS Based on Mathematical Statistical Methods

Che,

Zhu

2024

Machines

View full text Add to dashboard Cite

The encased differential planetary gear system (EDPGS) allows power to be distributed among multiple output paths, enhancing efficiency and reducing weight. Uniform load distribution ensures stable system operation and prolongs service life. However, stochastic manufacturing errors leading to uneven load distribution pose challenges in engineering practice. To investigate the impact of floating support parameters on the load-sharing performance within an acceptable tolerance band, a dynamic model of the EDPGS considering time-varying meshing stiffness and random errors is established using the Monte Carlo method. This study employs the orthogonal experimental design method to analyze the effects of floating support stiffness and clearance on the load-sharing characteristics. The findings indicate that a larger sample size leads to a probability distribution of load-sharing coefficients closer to the Gaussian distribution, with minimal influence on the expectation and variance. Furthermore, this study highlights the significant influence of floating structure parameters on load-sharing characteristics in the encased stage systems compared to the differential stage. Decreasing floating support stiffness or increasing floating clearance proves beneficial in enhancing the load-sharing performance of the system.

show abstract

“…Chen et al 21 developed a transverse-torsional dynamic model by the lumped-parameter method, which considers key factors such as mesh stiffnesses of involute and cycloidal gears, bearing stiffnesses, and support stiffnesses. Ryali et al 22 developed a hybrid planetary dynamic load distribution model to capture the influence of structural compliance associated with planet carrier, planet pin, and shaft. Tatar et al 23 developed a six-degrees-of-freedom dynamic model of a planetary geared rotor system with equally spaced planets.…”

Section: Introductionmentioning

confidence: 99%

An effective modelling approach for multi-body dynamic analysis of epicyclic gear train of GTF considering both structural flexibility and mechanical interactions

Liu,

Du,

Fang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part K:

View full text Add to dashboard Cite

In this paper, a new modelling approach is proposed for the dynamic investigation of epicyclic gear train, and the novelty of this work lies in consideration of both structural flexibility and mechanical interactions during the analysis procedure. The method is of capacity to directly present the dynamic results of the supporting structure for convenient practical engineering evaluation and reduce the dimension of the system reasonably with appropriate assumptions for better computational efficiency. Firstly, the mechanical interactions among components are discussed in detail, and the principle that the structural flexibility works is also explained at length. Secondly, taking the epicyclic gear train of the geared turbofan (GTF) engine; for example, the dynamic model of the system is then established based on the developed hybrid user-defined elements. For model validation, the governing equations of the system are also derived by the lumped mass method. Thirdly, with the same values of the parameters, the results of normal dynamic meshing force obtained by the proposed model are compared with the ones by the lumped mass model. It can be stated from the data that (1) the maximum relative error between the theoretical value and the average value calculated by the two models is 8.28%, (2) the gear mesh frequency obtained by the two models are sufficiently close to the theoretical value, and (3) the fluctuation trends of the dynamic force keep basically consistent with each other. In summary, the comparison presented clearly indicates that the proposed model is indeed reasonable, which provides a new way for dynamic investigation and structural redesign of a large epicyclic gear train. Finally, as a practical engineering application, the vibration result of the deformable supporting structure of the GTF gear train is also presented, which directly provides valuable reference for vibration monitoring, fault diagnosis and other engineering problems in practice.

show abstract

A dynamic gear load distribution model for epicyclic gear sets with a structurally compliant planet carrier

Cited by 13 publications

References 35 publications

Analysis of the Dynamic Characteristics of Coaxial Counter-Rotating Planetary Transmission System

Analysis of the Dynamic Characteristics of Coaxial Counter-Rotating Planetary Transmission System

Effect of Floating Support Parameters on the Load-Sharing Performance of EDPGS Based on Mathematical Statistical Methods

An effective modelling approach for multi-body dynamic analysis of epicyclic gear train of GTF considering both structural flexibility and mechanical interactions

Contact Info

Product

Resources

About