Purpose In the marine combined power plant, the dual-inputs geared shaft system is one of the main vibration sources. Due to the existence of multiple gear backlashes and complex working conditions, the teeth separation of gear pair is more likely to occur, that will cause severe vibration and deteriorate the operating environment of gears. Therefore, it is necessary to explore a new method to effectively suppress the teeth separation and improve the meshing state. Methods In order to explore the influences of speed control parameters on gear system, an electromechanical coupling model (EMCM) is introduced, which consists of two AC asynchronous motors and a single-stage parallel-axes gear transmission system. The dynamic process from no-load start to stable operation and parameter sensitivity are analyzed to research the electromechanical coupling characteristics. And by comparing the open-loop nonlinear model, the rigid-shaft EMCM and the flexible-shaft EMCM (used in this research), the necessity of the flexible-shaft EMCM is pointed out. Most importantly, the influences of speed control parameters under different operating conditions are investigated, and a novel method to improve the gear meshing state by adjusting speed control parameters Kp (proportional coefficient) and Ki (integral coefficient) is revealed. Results Under the stable conditions, selecting appropriate Kp and Ki reduces the vibration amplitudes of the dynamic transmission error and the dynamic meshing force by 88.13% and 78.59% respectively. While under the impact conditions, decreasing Kp and Ki reduces the amplitude of teeth separation by 88.64% and 84.52% respectively, and the influence of Kp is greater than that of Ki. Furthermore, for the three different types of impact, the speed control parameters have the same inhibitory effect on gear teeth separation. Conclusion By adjusting the speed control parameters of the main engines that does not need to increase, reduce or replace any mechanical equipment, not only the gear vibration is effectively suppressed, but also the engineering cost can be reduced. Graphical Abstract

Electromechanical Coupling Dynamic Characteristics and Influences of Speed Control Parameters of a Dual-Inputs Geared Shaft System

期刊论文
发表日期：

2025年10月30日

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Qingchun Zhang,
Donghua Wang,
Guanghao Dai,
Yang Yang,
Jie Tao,
Xiujiang Shi,
Wanyou Li

摘要

Purpose

In the marine combined power plant, the dual-inputs geared shaft system is one of the main vibration sources. Due to the existence of multiple gear backlashes and complex working conditions, the teeth separation of gear pair is more likely to occur, that will cause severe vibration and deteriorate the operating environment of gears. Therefore, it is necessary to explore a new method to effectively suppress the teeth separation and improve the meshing state.

Methods

In order to explore the influences of speed control parameters on gear system, an electromechanical coupling model (EMCM) is introduced, which consists of two AC asynchronous motors and a single-stage parallel-axes gear transmission system. The dynamic process from no-load start to stable operation and parameter sensitivity are analyzed to research the electromechanical coupling characteristics. And by comparing the open-loop nonlinear model, the rigid-shaft EMCM and the flexible-shaft EMCM (used in this research), the necessity of the flexible-shaft EMCM is pointed out. Most importantly, the influences of speed control parameters under different operating conditions are investigated, and a novel method to improve the gear meshing state by adjusting speed control parameters K_p (proportional coefficient) and K_i (integral coefficient) is revealed.

Results

Under the stable conditions, selecting appropriate K_p and K_i reduces the vibration amplitudes of the dynamic transmission error and the dynamic meshing force by 88.13% and 78.59% respectively. While under the impact conditions, decreasing K_p and K_i reduces the amplitude of teeth separation by 88.64% and 84.52% respectively, and the influence of K_p is greater than that of K_i. Furthermore, for the three different types of impact, the speed control parameters have the same inhibitory effect on gear teeth separation.

Conclusion

By adjusting the speed control parameters of the main engines that does not need to increase, reduce or replace any mechanical equipment, not only the gear vibration is effectively suppressed, but also the engineering cost can be reduced.

Graphical Abstract