Dynamics and efficiency of planetary gear sets for hybrid powertrains

Mohammadpour, Mahdi; Theodossiades, Stephanos; Rahnejat, Homer

doi:10.1177/0954406215590644

Cited by 31 publications

(33 citation statements)

References 25 publications

(44 reference statements)

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“…Equations (27) to (31) are equivalent to equation (32). Equation (33) is obtained by substituting È i into equations (9) and (12). The solution of the system vibration mode is first obtained by solving eight frequencies, !…”

Section: Proof Of Compound Modes Of Star Gearsmentioning

confidence: 99%

“…Proof of central member lateral modes. Based on the proof of equivalence, the proof of the lateral mode of the central element can be obtained by substituting È i into equations (6) to (9). The expressions for È i and " È i , according to its vibration mode characteristics, are as follows…”

Section: Proof Of Central Member Lateral Modesmentioning

confidence: 99%

“…As can be seen from equations (50) and (51), L 1 ¼ 0 and " L 1 ¼ 0 satisfy equation (9). The problem of finding the modal solution of the system is transformed into solving the eigenvalues !…”

Section: Proof Of Central Member Lateral Modesmentioning

confidence: 99%

“…They then investigated the effect of profile error excitations on the phenomenon, as well as the effects of the profile error excitations on the vibrations and dynamic meshing forces before and after the appearance of tooth separations. Mohammadpour et al 9 presented a tribo-dynamic model comprised of a six-degrees-offreedom torsional multi-body dynamic system for the planetary gear sets of hybrid-electric-vehicle configurations, in order to evaluate the lubricant film thickness, friction, and efficiency of the meshing gear teeth contact. Wei et al 10 proposed a dynamic modeling method that utilized a virtual equivalent shaft element, and constructed the dynamic model of a planetary gear system by applying this shaft element.…”

Section: Introductionmentioning

confidence: 99%

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Theoretical analysis of the vibration modes of the star herringbone gear transmission system

Wang

2019

Proceedings of the Institution of Mechanical Engineers, Part K:

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The star herringbone gear transmission system has a high load-carrying capacity, and is widely used in aviation, marine power drives, off-road vehicles, and hybrid electric-drive vehicles. Vibration and noise are the key concerns with this transmission system. The lumped mass method was adopted to establish the dynamic model and equations of this system. The modes of the system were analyzed and classified, and the eigenvalues and their multiplicities were determined. The results showed that the system has four typical vibration modes: (1) a lateral-rotational coupled vibration mode (multiplicity m = 1), (2) star gear compound mode (multiplicity m = N-3, N > 3), (3) center component lateral vibration mode (multiplicity m = 2), and (4) star gear and center gear-coupled mode (multiplicity m = 2). The contribution of this paper lies in the discovery of the coupling vibration modes in the star herringbone gear transmission system and the multiplicities of these modes. This work provides the foundation for further research on vibration suppression for the star herringbone gear transmission system and the theory of planet phasing.

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Section: Proof Of Compound Modes Of Star Gearsmentioning

confidence: 99%

Section: Proof Of Central Member Lateral Modesmentioning

confidence: 99%

Section: Proof Of Central Member Lateral Modesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Theoretical analysis of the vibration modes of the star herringbone gear transmission system

Wang

2019

Proceedings of the Institution of Mechanical Engineers, Part K:

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“…Figure 4 indicates the overall model of the hybrid power cutting transmission system which consists of traditional cutting system, coupling gears, and hydraulic system. The dynamics differential equations of the new hybrid power system are as follows [13]:̈+…”

Section: Description Of the Hybrid Power Cutting Transmission Systemmentioning

confidence: 99%

Performance Analysis of a Hybrid Power Cutting System for Roadheader

Yang

Yuan

2017

Mathematical Problems in Engineering

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An electrohydraulic hybrid power cutting transmission system for roadheader under specific working condition was proposed in this paper. The overall model for the new system composed of an electric motor model, a hydraulic pump-motor model, a torsional planetary set model, and a hybrid power train model was established. The working mode characteristics were simulated under the conditions of taking the effect of cutting picks into account. The advantages of new hybrid power cutting system about the dynamic response under shock load were investigated compared with the traditional cutting system. The results illustrated that the hybrid power system had an obvious cushioning in terms of the dynamic load of cutting electric motor and planetary gear set. Besides, the hydraulic motor could provide an auxiliary power to improve the performance of the electric motor. With further analysis, a dynamic load was found to have a high relation to the stiffness and damping of coupling in the transmission train. The results could be a useful guide for the design of cutting transmission of roadheader.

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