Active Magnetic Control of Oscillatory Axial Shaft Vibrations in Ship Shaft Transmission Systems Part 2: Control Analysis and Response of Experimental System

Lewis, David W.; Humphris, R. R.; Thomas, Peter

doi:10.1080/10402008908981877

Cited by 18 publications

(14 citation statements)

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“…Vibration control methods and facilities have been proposed to suppress the noise generated by the fluctuating propeller forces, for example, the resonance changer (Goodwin, 1960), the auxiliary magnetic thrust bearing (Lewis et al, 1989a(Lewis et al, , 1989b, the active stern support (Xie et al, 2019(Xie et al, , 2020, and the dynamic antiresonant vibration isolator (Liu et al, 2018). Baz et al (1990) used an active vibration control system to attenuate the thrust-induced vibration, and the amplitude is reduced by approximately 11 dB.…”

Section: Introductionmentioning

confidence: 99%

Investigation on vibration transmission control of a shafting system with active orthogonal support

Zhu

Xie

Zhang

2021

Journal of Vibration and Control

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A large proportion of the fluctuating propulsion forces transmit to the hull structure of an underwater vehicle through the stern support and cause structural vibration and sound radiation. To reduce the influence of the dynamic forces on the hull structure, a control method that uses an active orthogonal support is proposed. The active orthogonal support is arranged in the vertical and horizontal directions to connect the stern bearing and the hull structure and equipped with electromagnetic actuators to generate counter forces. A shaft–hull-coupled system is used to investigate the effectiveness of active orthogonal support, and numerical results indicate that the hull vibration and acoustic radiation can be significantly suppressed. The effectiveness of active orthogonal support was experimented as well. The experimental results have demonstrated that the active orthogonal support with local velocity feedback control is able to attenuate vibration transmission in the shaft–hull-coupled system.

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Section: Introductionmentioning

confidence: 99%

Investigation on vibration transmission control of a shafting system with active orthogonal support

Zhu

Xie

Zhang

2021

Journal of Vibration and Control

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“…Lewis et al. (1989a, 1989b) used an auxiliary magnetic thrust bearing to attenuate the force transmission through the propulsion system. The proposed method has a good isolation performance over certain frequency ranges, but, unfortunately, large vibration amplitudes of the shaft will be induced at low frequencies.…”

Section: Introductionmentioning

confidence: 99%

Application of a dynamic antiresonant vibration isolator to minimize the vibration transmission in underwater vehicles

Liu

Yin

et al. 2017

Journal of Vibration and Control

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Harmonic axial force resulting from a propeller’s first vibration mode is a major cause of tonal sound radiation of an underwater vehicle. To reduce the harmonic force, we employ a dynamic antiresonant vibration isolator (DAVI) in parallel with thrust bearing of the shafting system to attenuate vibration transmitted to the hull. The methods of transfer matrices and substructure synthesis are used to create a semi-analytical dynamic model of the propeller–shaft–hull system with DAVI. In this model, the elastic properties of the propeller and foundation are taken into consideration. The force transmissibility and power flow are then used to evaluate the isolation performance of the DAVI. For the purpose of comparison, a resonance changer (RC) proposed in the published literature is also used to reduce the axial vibration transmission. It is demonstrated numerically that by using DAVI, the vibration and power flow of the underwater vehicle are greatly attenuated at the designed frequency without obviously changing the axial fundamental resonance frequency of the shafting system, which is superior to the RC isolator.

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“…Vibration control strategies associated with shaft systems have been studied for decades and investigations have been focused on reducing vibration of the shaft system and force transmission by inserting auxiliary systems to change the dynamics of the original system. 1–5 Experiments concerning shaft dynamics and vibration control were carried out years ago. 4–7 Active control of vibration of the shaft system with different actuation scenarios has been reported by Lewis et al 5 and Baz et al 6 The results obtained by Pan et al 7 revealed that the stiffness of the thrust bearing’s oil film varies in a wide range with the shaft revolution speed, which implies that the influence of the speed-dependent characteristics of the shaft system needs to be considered in active control of hull vibrations.…”

Section: Introductionmentioning

confidence: 99%

“…1–5 Experiments concerning shaft dynamics and vibration control were carried out years ago. 4–7 Active control of vibration of the shaft system with different actuation scenarios has been reported by Lewis et al 5 and Baz et al 6 The results obtained by Pan et al 7 revealed that the stiffness of the thrust bearing’s oil film varies in a wide range with the shaft revolution speed, which implies that the influence of the speed-dependent characteristics of the shaft system needs to be considered in active control of hull vibrations. However, it should be pointed out that active vibration control of the time-varying shaft system that is coupled with hull structures has not been investigated and the control method involved is not yet available.…”

Section: Introductionmentioning

confidence: 99%

“…Active control methods, such as velocity feedback control and optimal control, have already been applied to suppress vibrations induced by the shaft system. 3–6 In these investigations, however, the control channel was treated as a time-invariant system. In fact, when the stiffness of the thrust bearing’s oil film changes in a wide range, the time-varying characteristics of the control channel have to be considered in the construction of active control strategies.…”

Section: Introductionmentioning

confidence: 99%

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Tonal vibration suppression with a model-free control method

Chen

Zhang

et al. 2012

Proceedings of the Institution of Mechanical Engineers, Part M:

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A novel model-free control method for actively suppressing tonal structural vibration is investigated through numerical simulation and experiment. The model-free control method is established on the least-mean-squares-based adaptive feedback control principle, and an instrumental mechanism for adjusting the controller parameters is proposed to guarantee convergence of the algorithm. In the numerical verification of the model-free control method, a shaft–plate system is used to derive a lightly damped dynamic model, which is obtained by frequency response function synthesis, while in the experiment a shaft–cylinder system with time-varying dynamics is applied to evaluate the control system with respect to its potential in vibration control. In the control system, an electromagnetic actuator mounted on the shaft is enforced with the model-free control method to cancel vibration induced by the disturbance forces. Simulation results have demonstrated that the model-free control method is able to guarantee stability in the presence of changes in the disturbances and plant dynamics and that it is effective in attenuating vibration of the system. Experimental results have also demonstrated that the control system can tranquilize vibration of the shaft and suppress tonal vibrations in the shell effectively, but variation in the control channel should be sufficiently slow that the algorithm can complete its adaptation in time.

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Active Magnetic Control of Oscillatory Axial Shaft Vibrations in Ship Shaft Transmission Systems Part 2: Control Analysis and Response of Experimental System

Cited by 18 publications

References 1 publication

Investigation on vibration transmission control of a shafting system with active orthogonal support

Investigation on vibration transmission control of a shafting system with active orthogonal support

Application of a dynamic antiresonant vibration isolator to minimize the vibration transmission in underwater vehicles

Tonal vibration suppression with a model-free control method

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