Analysis of the Effect of Structural Flexibility on Dynamic Characteristics of a Power Tri-branching Reducer

YAN Hai; WEN Lihua; CAO Hao; SONG Wen

doi:10.11993/j.issn.2096-3920.2025-0041

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YAN Hai, WEN Lihua, CAO Hao, SONG Wen. Analysis of the Effect of Structural Flexibility on Dynamic Characteristics of a Power Tri-branching Reducer[J]. Journal of Unmanned Undersea Systems. doi: 10.11993/j.issn.2096-3920.2025-0041

Citation:

YAN Hai, WEN Lihua, CAO Hao, SONG Wen. Analysis of the Effect of Structural Flexibility on Dynamic Characteristics of a Power Tri-branching Reducer[J]. Journal of Unmanned Undersea Systems. doi: 10.11993/j.issn.2096-3920.2025-0041

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Analysis of the Effect of Structural Flexibility on Dynamic Characteristics of a Power Tri-branching Reducer

doi: 10.11993/j.issn.2096-3920.2025-0041

YAN Hai^{1, 2
,},
WEN Lihua¹,
CAO Hao^{1, 2},
SONG Wen²

1.
School of Astronautics, Northwestern Polytechnical University, Xi’an 710077, China
2.
Xi’an Institute of Precision Machinery, Xi’an 710077, China

Received Date: 2025-03-03
Accepted Date: 2025-03-17
Rev Recd Date: 2025-03-13

Available Online: 2025-07-23

Abstract

Abstract

To investigate the effect of flexibility of the housing, shaft and spline coupling on the mesh stiffness and dynamic response of the powertrain system, and to compare the differences between different modeling methods, taking a power tri-branching reducer as the object, a fully flexible multibody dynamic model of the reducer was established, and three flexible multibody dynamic models were developed by considering specified types components as rigid. The influence of structural flexibility on mesh stiffness and dynamic response of the reducer was studied using time domain and frequency domain analysis. The results show that the effect of structural flexibility on mesh stiffness can be ignored; the flexibility of the housing has a significant impact on the vibration characteristics of the system, especially when the housing mode coincides or approaches the mesh frequency, the resonance makes the vibration response amplitude of the system significantly increase; ignoring the flexibility of the shaft may result in the loss of spectral lines at certain mesh frequencies; the flexibility of a spline coupling only affects the vibration characteristics of its connecting shaft, and has a small impact on the vibration characteristics of other components of the system. Therefore, different analysis models need to be used different analysis purposes. When analyzing mesh stiffness, only a rigid body model needed to be established, when analyzing the vibration characteristics of the system, it is necessary to use a fully flexible model.
- meshing stiffness,
- vibration response,
- flexibility,
- spline coupling,
- power three branches

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References(12)

References

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