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Machines
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Advanced Dynamic Analysis and Vibro-Acoustic Control Methods
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Advanced Dynamic Analysis and Vibro-Acoustic Control Methods

A special issue of Machines (ISSN 2075-1702). This special issue belongs to the section "Robotics, Mechatronics and Intelligent Machines".

Deadline for manuscript submissions: closed (22 January 2024) | Viewed by 4398

Special Issue Editor

Prof. Dr. Jing Liu

E-Mail Website
Guest Editor
School of Marine Science and Technology, Northwestern Polytechnical University, Xi'an 710072, China
Interests: dynamics; vibrations; acoustics; fault diagnosis; power loss
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

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

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Machines is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

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

Published Papers (3 papers)

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Research

29 pages, 29604 KiB  
Article
Nonlinear Dynamics and Combination Resonance of a Flexible Turbine Blade with Contact and Friction of Shrouds
by Hua Li, Gaofei Yuan, Zifeng Yu, Yuefang Wang and Dzianis Marmysh
Machines 2024, 12(1), 59; https://doi.org/10.3390/machines12010059 - 12 Jan 2024
Viewed by 921
Abstract
Flexible shrouded blades are commonly adopted in the last stages of steam turbines where complicated dynamical behavior can be induced by dry friction force generated on contacting interfaces between adjacent shrouds and the geometric nonlinearity due to the structural flexibility of the blades. [...] Read more.
Flexible shrouded blades are commonly adopted in the last stages of steam turbines where complicated dynamical behavior can be induced by dry friction force generated on contacting interfaces between adjacent shrouds and the geometric nonlinearity due to the structural flexibility of the blades. In this paper, combination resonance caused by contact and friction forces generated on shroud interfaces is investigated, which is a concurrence of 1:3 internal resonance involving the first and second modes in the flapwise direction and the primary resonance of the first flapwise mode. The stiffness and damping at the contact interface are obtained by linearizing the contact and friction forces between shrouds through the harmonic balance method. The vibrating blade is modeled as a beam with a concentrated mass of which the responses under the combination resonance are solved through the multiple-scale method. Sensitivities of response with respect to the angle of shrouds, contact stiffness and rotation speed are illustrated, and the influences of these parameters on the periodicity and amplitudes of steady responses are demonstrated. The parametric regions where the combination resonance occurs are pointed out. Finally, parametric analyses are presented to show how the amplitude–frequency relation of the multiple-scale solutions under the combination resonance vary with detuning and design parameters. The present research provides a designing basis for improving the dynamic performance of flexible shrouded blades and suppressing vibrations of blades by adjusting structural parameters in practical engineering. Full article
(This article belongs to the Special Issue Advanced Dynamic Analysis and Vibro-Acoustic Control Methods)
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21 pages, 6819 KiB  
Article
Vibro-Acoustic Performance of a Fluid-Loaded Periodic Locally Resonant Plate
by Zhiwei Guo, Meiping Sheng, Hao Zeng, Minqing Wang and Qiaojiao Li
Machines 2023, 11(6), 590; https://doi.org/10.3390/machines11060590 - 26 May 2023
Cited by 3 | Viewed by 979
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 [...] Read more.
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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22 pages, 10354 KiB  
Article
Research on the Power Loss of High-Speed and High-Load Ball Bearing for Cryogenic Turbopump
by Wenhu Zhang, Chaojie Zhang, Xusheng Miao, Liang Li and Sier Deng
Machines 2022, 10(11), 1080; https://doi.org/10.3390/machines10111080 - 16 Nov 2022
Cited by 1 | Viewed by 1808
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 [...] Read more.
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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