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Machines
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Research on Rotor Dynamics and Vibration Control
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Research on Rotor Dynamics and Vibration Control

A special issue of Machines (ISSN 2075-1702). This special issue belongs to the section "Machine Design and Theory".

Deadline for manuscript submissions: closed (31 December 2023) | Viewed by 6921

Special Issue Editors

Prof. Dr. Hui Ma

E-Mail Website
Guest Editor
School of Mechanical Engineering and Automation, Northeastern University, Shenyang 110819, China
Interests: rotating machinery dynamics; fault diagnosis; dynamic design of mechanical systems
Dr. Ke Feng

E-Mail Website
Guest Editor
School of Engineering, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
Interests: machine condition monitoring; vibration analysis; fault diagnosis and prognostics; digital twin; dynamic; signal processing
Special Issues, Collections and Topics in MDPI journals
Dr. Jin Zeng

E-Mail Website
Guest Editor
School of Mechanics and Aerospace Engineering, Southwest Jiaotong University, Chengdu 611756, China
Interests: rotor dynamics; fault diagnosis

Special Issue Information

Dear Colleagues,

Rotor dynamics is a subject studying the dynamic characteristics of rotors and other components in rotating machinery. Modern rotor dynamics mainly focuses on complex rotor systems represented by gas turbines, centrifugal/axial-flow compressors, aero-engines, and wind turbines. Strict performance requirements and a harsh service environment make the vibration problem of rotating machinery increasingly prominent, which is mainly reflected in the complicated nonlinear dynamic behaviors caused by rotor–stator structural couplings and multifield coupling.

At present, the research on rotor dynamics and vibration control mainly involves:

  • dynamic modeling of rotor systems;
  • critical speed and vibration response calculation;
  • flexible rotor dynamic balance technology;
  • dynamic characteristics of various bearing-supporting rotors;
  • dynamic stability of rotor systems;
  • nonlinear dynamics of rotor systems;
  • rotor system vibration fault and its diagnosis technology;
  • active and passive vibration reduction of rotor systems;
  • vibration of rotor systems under multifield coupling excitation.

Prof. Dr. Hui Ma
Dr. Ke Feng
Dr. Jin Zeng
Guest Editors

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

  • rotor dynamics
  • nonlinear dynamics
  • vibration control

Published Papers (5 papers)

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Research

Jump to: Review

21 pages, 22443 KiB  
Article
Synchronization of Dual Induction Motor Multi-Frequency Control Based on Fixed Speed Ratio
by Xin Zhang and Lei Jia
Machines 2024, 12(2), 97; https://doi.org/10.3390/machines12020097 - 31 Jan 2024
Viewed by 869
Abstract
For the same frequency, a vibrating screen usually can only achieve a circular or linear motion trajectory, which will lead to the phenomenon of screen clogging. The compound frequency vibrating screen can achieve various motion trajectories according to different frequency ratios, thus perfectly [...] Read more.
For the same frequency, a vibrating screen usually can only achieve a circular or linear motion trajectory, which will lead to the phenomenon of screen clogging. The compound frequency vibrating screen can achieve various motion trajectories according to different frequency ratios, thus perfectly solving this problem. Thus, the multi-frequency control synchronization problem of the dual induction motor-driven vibration system based on the fixed speed ratio was studied. Firstly, by establishing an electromechanical coupled dynamics model of the vibration system driven by dual induction motors, the response equation of the fixed speed ratio vibration system was derived. Then, the master–slave control strategy was used to control the two induction motors through PID control optimized by a genetic algorithm. The slave motor tracked the main motor through the speed ratio method and achieved fixed speed ratio control synchronization. The simulation analysis showed that the two induction motors vibration system could not achieve self-synchronous motion with a fixed speed ratio, but by using the back propagation proportion-integral-derivative control (BP PID, PID based on BP neural network), we were able to achieve control synchronization with a fixed speed ratio. Herein, the arbitrariness of the fixed speed ratio parameter is also discussed, and controlled synchronous motion of the vibration system with a non-integer fixed speed ratio was realized. Finally, the simulation results were verified through experiments with the fixed speed ratio parameter n = 1.5, which verified the validity of the synchronization theory of fixed speed ratio control in vibrating systems and made it possible to apply it in compound frequency vibrating screens. Full article
(This article belongs to the Special Issue Research on Rotor Dynamics and Vibration Control)
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20 pages, 9439 KiB  
Article
Novel Design of Variable Stiffness Pneumatic Flexible Shaft Coupling: Determining the Mathematical-Physical Model and Potential Benefits
by Peter Kaššay, Robert Grega, Matej Urbanský, Jozef Krajňák, Matúš Kačír and Lucia Žuľová
Machines 2024, 12(1), 28; https://doi.org/10.3390/machines12010028 - 31 Dec 2023
Cited by 1 | Viewed by 1111
Abstract
Presently, mechanical system vibroisolation is becoming increasingly important. One of the new approaches is semi-active vibroisolation using elements capable of changing a selected mechanical property. These include, among others, pneumatic flexible shaft couplings capable of changing torsional stiffness during operation. The main goal [...] Read more.
Presently, mechanical system vibroisolation is becoming increasingly important. One of the new approaches is semi-active vibroisolation using elements capable of changing a selected mechanical property. These include, among others, pneumatic flexible shaft couplings capable of changing torsional stiffness during operation. The main goal of the article is to examine the potential advantages of a newly patented pneumatic coupling over a current type with the same pneumatic element arrangement. For comparison, parameters determinable from static load characteristics were selected. These parameters are maximum twist angle and torque, average torsional stiffness, and the percentage of torque transmitted by the bellows rubber shell. In all cases, the new coupling had better properties. Since the prototype of the new coupling has not yet been produced, its parameters were determined from its mathematical-physical model. The article contains a full procedure to obtain the static load characteristic of a new coupling type, beginning with the determination of air bellows force/height and volume/height characteristics, then optimum sizes of coupling with regards to the operating range of elements, the dependency of element height on the coupling’s twist angle, and finally the computation of the static load characteristic considering isothermal gas compression. The presented procedure can be applied to any pneumatic bellows where the force/height characteristics of different pressures are given. Full article
(This article belongs to the Special Issue Research on Rotor Dynamics and Vibration Control)
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20 pages, 6344 KiB  
Article
Study of the Transmission Characteristics of the Cycloid Gear Based on a Multi-Objective Optimization Modification
by Xueping Song, Yang Chen and Jianming Yang
Machines 2023, 11(8), 775; https://doi.org/10.3390/machines11080775 - 25 Jul 2023
Cited by 1 | Viewed by 1496
Abstract
Due to the advantages of high transmission accuracy and high impact resistance, cycloid-pin gear drives are widely used in precision machinery. In the actual manufacturing and use process, a suitable clearance must be left between the cycloid gear and the pin teeth to [...] Read more.
Due to the advantages of high transmission accuracy and high impact resistance, cycloid-pin gear drives are widely used in precision machinery. In the actual manufacturing and use process, a suitable clearance must be left between the cycloid gear and the pin teeth to meet the requirements of assembly lubrication, so the cycloid gear needs to be modified. In order to improve the performance of the cycloid-pin gear drive, this paper proposes a multi-objective optimization modification method which takes into account the maximum transmission error of the cycloid drive on the basis of the compound modification. Firstly, a compound modification function is constructed based on the equations of the cycloid gear. Tooth contact analysis is carried out on the cycloid gear to obtain the equations for calculating the transmission error and return error of the cycloid pinion drive and to solve for the transmission error and return error of a single cycle with different modification coefficients. Then, a multi-objective optimization model is constructed, and the optimum coefficients are solved by genetic algorithm. By analyzing the forces on the cycloid gear under load, the range, the number and the contact force of meshing teeth are calculated for different modification methods. At the end, the cycloid gear is modeled and finite element analyzed after multi-objective optimization modification and compound modification according to the optimal modification coefficients. By finite element analysis, the correctness of the theoretical calculation of the contact force of the modified cycloid gear and the loading transmission error is solved. The contact forces and transmission error of the multi-objective optimization modification are less than the compound modification. The theoretical calculation and finite element analysis indicate that the cycloid profile with the multi-objective optimization modification is better than the profile with the compound modification. Full article
(This article belongs to the Special Issue Research on Rotor Dynamics and Vibration Control)
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15 pages, 10125 KiB  
Article
Dynamic Characteristics of a Rotating Blade with a Dovetail Fixture
by Xiaoyu Fan, Wenchao Liang, Jin Zeng, Yang Yang, Hui Ma, Chenguang Fan and Shunguo Fu
Machines 2023, 11(6), 643; https://doi.org/10.3390/machines11060643 - 12 Jun 2023
Viewed by 1049
Abstract
Considering rotation-induced centrifugal stiffening, spin softening, and Coriolis effects, the reduced dynamic model of a rotating blade with a dovetail fixture is established in the ANSYS environment via the fixed-interface method for higher computational efficiency and lower memory consumption. Then some parameters such [...] Read more.
Considering rotation-induced centrifugal stiffening, spin softening, and Coriolis effects, the reduced dynamic model of a rotating blade with a dovetail fixture is established in the ANSYS environment via the fixed-interface method for higher computational efficiency and lower memory consumption. Then some parameters such as rotating speed, friction factor, and stator blade number affecting the nonlinear vibration responses of the system under the combined actions of aerodynamic force, centrifugal force, and gravity are elaborately discussed. The results show that: (1) the contact-induced nonlinearity between the tenon and the mortise mainly results in the frequency multiplications of the aerodynamic excitation frequency; (2) a larger friction factor results in a lower magnitude of contact pressure and a higher resonance frequency, while a larger stator blade number results in a lower magnitude of the uniform and continuous contact pressure distribution; (3) the excitation of the resonant mode caused by the aerodynamic force is primarily characterized by the first-order bending mode of the system. Full article
(This article belongs to the Special Issue Research on Rotor Dynamics and Vibration Control)
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Review

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21 pages, 5877 KiB  
Review
Research Progress on the Dynamic Characteristics of Planetary Gear Transmission in a Non-Inertial System
by Bingwei Gao, Yongkang Wang and Guangbin Yu
Machines 2023, 11(7), 751; https://doi.org/10.3390/machines11070751 - 18 Jul 2023
Viewed by 1398
Abstract
Planetary gear systems have many advantages over other gear systems. Previous studies on its dynamic characteristics mostly used Earth as the reference system, which is inconsistent with the actual working conditions of many planetary gear systems, such as aircraft maneuvering, vehicle movement changes, [...] Read more.
Planetary gear systems have many advantages over other gear systems. Previous studies on its dynamic characteristics mostly used Earth as the reference system, which is inconsistent with the actual working conditions of many planetary gear systems, such as aircraft maneuvering, vehicle movement changes, etc. By analyzing representative research papers, this study summarizes the lumped-parameter, finite element, and rigid–flexible coupling models commonly used in studying the traditional dynamic characteristics. Then, the research status of gear–rotor and planetary gear systems in inertial and non-inertial systems is summarized. The research progress of load characteristics, vibration characteristics, and vibration control of the traditional planetary gear system is summarized. Finally, some suggestions for future development are put forward. There are a few studies on the non-inertial dynamics of planetary gear systems. The three analysis models have distinct characteristics and applications but can all be used in non-inertial systems. The dynamic analysis method of non-inertial rotor systems can be combined with the dynamic study of gear systems. It is of practical significance to study the non-inertial dynamic characteristics of planetary gear systems. Scholars can refer to the non-inertial dynamic research of the gear–rotor system, select the analysis model according to the needs, and continue to study the dynamic characteristics of the planetary gear system under the non-inertial system. Full article
(This article belongs to the Special Issue Research on Rotor Dynamics and Vibration Control)
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