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Special Issue "Advanced Dynamic Analysis and Vibro-Acoustic Control Methods"

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Dear Colleagues,

Advanced dynamic analysis and vibro-acoustic control is the tracking of any aspect of an industry mechanical components’ performance by reliably measured data and analytical simulations in conjunction with the heuristic experience so that the current and expected future performance of the machine for at least the most critical limit events can be described in a proactive manner. Advanced dynamic analysis and vibro-acoustic control methods, together with abundant measurement and simulation information, can greatly improve the performances of various industry mechanical systems. Although many works have been introduced to develop the method for determining the working status of different machines by using different simulation and experimental techniques, it still is challenging and difficult to accurately determine the time-varying working status because the practical working conditions are extremely complex and stochastic. Classical statistical features obtained from the raw vibration signal fail to hold understanding and steadiness for working status detection, exclusively in multifaceted noisy situations. A proper application and integrations of dynamic simulation and analysis, signal processing methods, measurement system, and machine learning can lead to the development of accurate simulation and experimental methods of mechanical systems for industry applications. Moreover, the advanced dynamic analysis and vibro-acoustic control methods can be helpful for preventing the incipient failures of the mechanical components.

Prof. Dr. Jing Liu
Guest Editor

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Keywords

dynamic modelling and analysis
vibration control methods
vibro-acoustic analysis and control methods
maintenance and reliability
tribo-vibration analysis
condition monitoring methods in industrial applications

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Research

Open AccessArticle

Vibro-Acoustic Performance of a Fluid-Loaded Periodic Locally Resonant Plate

and

Machines 2023, 11(6), 590; https://doi.org/10.3390/machines11060590 - 26 May 2023

Viewed by 357

Abstract

The vibro-acoustic performance of a fluid-loaded periodic locally resonant (LR) plate was examined in this research, with a specific focus on the effect of water fluid on the vibration and sound radiation of the LR structure. The analytical models of the fluid-loaded LR plate’s band gap, vibration, and acoustic radiation were theoretically derived with closed-form solutions, which can be used to predict the general vibro-acoustic rules of underwater LR structure. The results show that the LR band-gap width and Bragg frequency are significantly reduced when water fluid is considered. Besides, the frequency range that can be tuned to control the vibration and sound radiation for the LR plate with fluid is much narrower than that without fluid. The reason for inducing the above effects was also given in this research, which can be physically explained by the attached mass caused by the water fluid. In addition, the reason for the enhanced radiation efficiency close above the band gap was also discussed, which is caused by the change of radiation mode from corner or edge radiation to monopole radiation. Furthermore, adding small damping into the resonator could reduce the vibration and sound radiation in the frequency range above or close below the band gap, inducing the attenuation zone to be significantly broadened. Thus, designing the periodic resonators with proper damping could be an efficient method to make the LR plate more beneficial for vibration and noise reduction in water-surrounding applications. Full article

(This article belongs to the Special Issue Advanced Dynamic Analysis and Vibro-Acoustic Control Methods)

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Open AccessArticle

Research on the Power Loss of High-Speed and High-Load Ball Bearing for Cryogenic Turbopump

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Machines 2022, 10(11), 1080; https://doi.org/10.3390/machines10111080 - 16 Nov 2022

Cited by 1 | Viewed by 998

Abstract

This paper studies the lubrication characteristics of ball bearings for cryogenic turbopumps. First, the frictional coefficients between 440C and a Ag coating, 440C and solid PTFE (polytetrafluoroethylene), and 440C and a PTFE coating in LN2 (liquid nitrogen) are obtained using a ball-on-disk testing machine under a high sliding speed in the range of 0 to 8 m/s and a high contact stress in the range of 2.5 to 3.5 GPa. Dynamic and power loss models of high-speed and high-load ball bearings are established to study the key factors affecting the heat generation characteristics. In order to verify the correctness of these two theoretical models, a coupled fluid-thermal finite element model is built to evaluate the temperatures of the outer ring under different bearing speeds, which are then proved by experiments with ball bearings for cryogenic turbopumps. The results show that the power loss due to the spinning-sliding of the ball and the churning and drag of LN2 account for more than 80% of the total power loss; the spin-roll ratio of the ball on the inner raceway is a key indicator for this type of ball bearing, and the relatively small radial clearance and contact angle are suggested. Both of the proposed theoretical models have sufficient accuracy and can be used in the performance evaluation and optimization design of bearings. Full article

(This article belongs to the Special Issue Advanced Dynamic Analysis and Vibro-Acoustic Control Methods)

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Special Issue "Advanced Dynamic Analysis and Vibro-Acoustic Control Methods"

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