Modal Properties of Contra-rotating Encased Differential Gear Train Used in Coaxial Helicopter

Zhang, Donglin; Zhu, Rupeng; Fu, Bibo; Tan, Wuzhong

doi:10.1007/s42417-019-00179-0

Cited by 8 publications

(4 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The research shows that the model can well reflect the influence of tooth surface wear on the dynamic characteristics. Zhang et al [24] established a planetary gear train translation-torsion dynamic model using the lumped-parameter method. The natural frequency and vibration mode characteristics of the coaxial helicopter main reducer were analyzed.…”

Section: Lumped-parameter Modelmentioning

confidence: 99%

Research Progress on the Dynamic Characteristics of Planetary Gear Transmission in a Non-Inertial System

Gao

Wang

2023

Machines

View full text Add to dashboard Cite

Planetary gear systems have many advantages over other gear systems. Previous studies on its dynamic characteristics mostly used Earth as the reference system, which is inconsistent with the actual working conditions of many planetary gear systems, such as aircraft maneuvering, vehicle movement changes, etc. By analyzing representative research papers, this study summarizes the lumped-parameter, finite element, and rigid–flexible coupling models commonly used in studying the traditional dynamic characteristics. Then, the research status of gear–rotor and planetary gear systems in inertial and non-inertial systems is summarized. The research progress of load characteristics, vibration characteristics, and vibration control of the traditional planetary gear system is summarized. Finally, some suggestions for future development are put forward. There are a few studies on the non-inertial dynamics of planetary gear systems. The three analysis models have distinct characteristics and applications but can all be used in non-inertial systems. The dynamic analysis method of non-inertial rotor systems can be combined with the dynamic study of gear systems. It is of practical significance to study the non-inertial dynamic characteristics of planetary gear systems. Scholars can refer to the non-inertial dynamic research of the gear–rotor system, select the analysis model according to the needs, and continue to study the dynamic characteristics of the planetary gear system under the non-inertial system.

show abstract

Section: Lumped-parameter Modelmentioning

confidence: 99%

Research Progress on the Dynamic Characteristics of Planetary Gear Transmission in a Non-Inertial System

Gao

Wang

2023

Machines

View full text Add to dashboard Cite

show abstract

“…Li et al [17] developed a dynamic model for a two-stage parallel-axis gear system with variable mesh stiffness, revealing the variations in system vibration under the interaction of coaxial gear ratios and meshing phases. 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.…”

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

“…Zhu et al [3][4][5] analyzed the dynamic floating displacement of center gear and meshing stiffness variation instabilities in an encased differential planetary gear train and studied the nonlinear dynamic behavior. Zhang et al [6][7][8] studied the dynamic characteristic of a coaxial contrarotating encased differential gear train. Yang et al [9] investigated the dynamic characteristic of an encased differential gear train with journal bearing.…”

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

Self Cite

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

Modal Properties of Contra-rotating Encased Differential Gear Train Used in Coaxial Helicopter

Cited by 8 publications

References 20 publications

Research Progress on the Dynamic Characteristics of Planetary Gear Transmission in a Non-Inertial System

Research Progress on the Dynamic Characteristics of Planetary Gear Transmission in a Non-Inertial 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

Contact Info

Product

Resources

About