Special Issue "Selected Papers from 14th National Conference on Vibration Theory and Application (NVTA 2021)"

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Acoustics and Vibrations".

Deadline for manuscript submissions: closed (31 March 2022) | Viewed by 3065

Special Issue Editors

Prof. Dr. Haiyan Hu *
E-Mail Website
Guest Editor
1. Department of Mechanics, School of Aerospace Engineering,Beijing Institute of Technology, Beijing 100081, China
2. State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
Interests: nonlinear dynamics; vibration control; aeroelasticity; etc.
* Academician, the Chinese Academy of Science
Prof. Dr. Ning Hu
E-Mail Website
Guest Editor
State Key Laboratory of Reliability and Intelligence Electrical Equipment, National Engineering Research Center for Technological Innovation Method and Tool, and School of Mechanical Engineering, Hebei University of Technology, Tianjin 300401, China
Interests: solid mechanics, computational Materials Science, evaluation of various physical properties of structures and materials
Prof. Dr. Xinye Li
E-Mail Website
Assistant Guest Editor
School of Mechanical Engineering, Hebei University of Technology, Tianjin 300401, China
Interests: dynamic modeling, theoretical analysis and digital simulation of complex mechanical systems; bifurcation and control of dynamic behavior of nonlinear vibration system

Special Issue Information

Dear Colleagues,

The 14th National Conference on Vibration Theory and Application (NVTA) will be held in Tianjin from October 22 to 25, 2021. It will be hosted and organized by Hebei University of Technology and chaired by Prof. Haiyan Hu, President of the Chinese Society For Vibration Engineering (CSVE) and an Academician of the Chinese Academy of Science. Executive Chair is the Vice President Prof. Ning Hu from Hebei University of Technology. The conference serves as a forum to exchange ideas for research and the application of vibration theories and technologies in advanced industrial systems and their manufactures. The major goal is to promote the transformation of academic achievements into productivity. For the first time, the conference will be held in three ways, including plenary and parallel sessions, a teaching forum for vibration engineering, and an industrial exhibition. Both on-site and on-line participations are welcome.

This conference will provide a chance for colleagues to communicate and exchange scientific and technological works in the field of vibration engineering, promote innovation of the discipline, and inspire and boost scientific researches and applications. Renowned scientists both at home and abroad are invited to deliver keynote speeches on the recent advancements and frontiers in the relevant fields. The conference will specifically highlight, but will not be limited to, the following themes:

  • Vibration of vehicle systems, including railway vehicle systems;
  • Vibration of ships, and marine structures;
  • Vibration of aerospace structures;
  • Vibration and control for robot systems;
  • Dynamics and control for rotor systems;
  • Dynamics and control for multi-body systems;
  • Dynamic testing, signal analysis and fault diagnosis;
  • Microfluid and fluid–solid coupling vibration;
  • Explosion and impact dynamics;
  • Random vibration;
  • Non-linear vibration;
  • Vibration utilization, including vibration energy harvesting systems, transducers, rehabilitation medicine, and so on;
  • Vibration of micro–nano structures and smart structures;
  • Vibration of construction machinery, such as shield machines, shearers, excavators and cranes;
  • Vibration of mechanical systems and industrial equipments, including rolling mills, mills, packaging machines, agricultural machinery, and machine tools;
  • Dynamic modeling and simulation of complex systems, such as debris flows, sandstorms and nervous systems;
  • Vibration of structures and soil dynamics;
  • Vibration of special equipments, such as elevators, drones, air conditioners, and gyroscopes;
  • Vibration of power systems, such as wind power and hydropower equipments;
  • Vibration in interdisciplinary and other fields.

Submission email address:  [email protected]

Prof. Dr. Haiyan Hu
Prof. Dr. Ning Hu
Prof. Dr. Xinye Li
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. Applied Sciences is an international peer-reviewed open access semimonthly 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 2300 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.

Published Papers (6 papers)

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Research

Article
Explicit Solutions to Large Deformation of Cantilever Beams by Improved Homotopy Analysis Method I: Rotation Angle
Appl. Sci. 2022, 12(13), 6400; https://doi.org/10.3390/app12136400 - 23 Jun 2022
Viewed by 201
Abstract
An improved homotopy analysis method (IHAM) is proposed to solve the nonlinear differential equation, especially for the case when nonlinearity is strong in this paper. As an application, the method was used to derive explicit solutions to the rotation angle of a cantilever [...] Read more.
An improved homotopy analysis method (IHAM) is proposed to solve the nonlinear differential equation, especially for the case when nonlinearity is strong in this paper. As an application, the method was used to derive explicit solutions to the rotation angle of a cantilever beam under point load at the free end. Compared with the traditional homotopy method, the derivation includes two steps. A new nonlinear differential equation is firstly constructed based on the current nonlinear differential equation of the rotation angle and the auxiliary quadratic nonlinear differential equation. In the second step, a high-order non-linear iterative homotopy differential equation is established based on the new non-linear differential equation and the auxiliary linear differential equation. The analytical solution to the rotation angle is then derived by solving this high-order homotopy equation. In addition, the convergence range can be extended significantly by the homotopy–Páde approximation. Compared with the traditional homotopy analysis method, the current improved method not only speeds up the convergence of the solution, but also enlarges the convergence range. For the large deflection problem of beams, the new solution for the rotation angle is more approachable to the engineering designers than the implicit exact solution by the Euler–Bernoulli law. It should have significant practical applications in the design of long bridges or high-rise buildings to minimize the potential error due to the extreme length of the beam-like structures. Full article
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Article
Explicit Solution to Large Deformation of Cantilever Beam by Improved Homotopy Analysis Method II: Vertical and Horizontal Displacements
Appl. Sci. 2022, 12(5), 2513; https://doi.org/10.3390/app12052513 - 28 Feb 2022
Viewed by 280
Abstract
Explicit solutions to vertical and horizontal displacements are derived for large deformation of a cantilever beam under point load at the free end by an improved homotopy analysis method (IHAM). Quadratic and cubic nonlinear differential equations are adopted to construct more proficient nonlinear [...] Read more.
Explicit solutions to vertical and horizontal displacements are derived for large deformation of a cantilever beam under point load at the free end by an improved homotopy analysis method (IHAM). Quadratic and cubic nonlinear differential equations are adopted to construct more proficient nonlinear equations for vertical and horizontal displacements respectively combined with their currently available nonlinear displacement equations. Higher-order nonlinear iterative homotopy equations are established to solve the vertical and horizontal displacements by combining simultaneous equations of the constructed nonlinear equations and the auxiliary linear equations. The convergence range of vertical displacement is extended by the homotopy-Páde approximation. The explicit solutions to the vertical and horizontal displacements are in favorable agreements with the respective exact solutions. The convergence ranges for a relative error of 1% by the improved homotopy analysis method for vertical and horizontal displacements increases by 60% and 7%, respectively. These explicit formulas are helpful in practical engineering design for very slender structures, such as high-rise buildings and long bridges. Full article
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Article
An Experimental Study on the Vibration Transmission Characteristics of Wrist Exposure to Hand Transmitted Vibration
Appl. Sci. 2022, 12(4), 2232; https://doi.org/10.3390/app12042232 - 21 Feb 2022
Viewed by 358
Abstract
This research intends to further improve the understanding of vibration damage mechanisms in the wrist area and to establish a more effective biodynamic model of the hand-arm system. Scholars have conducted some research work around the influencing factors of vibration response and commonly [...] Read more.
This research intends to further improve the understanding of vibration damage mechanisms in the wrist area and to establish a more effective biodynamic model of the hand-arm system. Scholars have conducted some research work around the influencing factors of vibration response and commonly used vibration transmissibility to characterize the local vibration transmission characteristics of the hand-arm system. In this paper, a hand-transmitted vibration test platform was built according to ISO 10819, and a random combination of four ergonomic factors, namely wrist posture, arm posture, grip force, and thrust force, was used to test the vibration response of six subjects’ wrists; the total vibration transmissibility of the wrist was calculated according to the transmissibility formula. The effect of the four factors on the total vibration transmissibility of the wrist part was comprehensively analyzed, in which the wrist posture was proposed for the first time. The results show that (1) vibration transmissibility of the wrist is not only related to the arm posture, thrust force, and grip force but also related to the wrist posture; (2) the total vibration transmissibility and resonance frequency on the wrist has small correlation with large grip force and thrust force, and the vibration transmissibility of grip force 30 N and 60 N are basically equal in the low-frequency band (from 5–10 Hz to 5–20 Hz); (3) the wrist postures have a significant effect on the total vibration transmissibility at the wrist. Full article
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Article
Capturing a Space Target Using a Flexible Space Robot
Appl. Sci. 2022, 12(3), 984; https://doi.org/10.3390/app12030984 - 19 Jan 2022
Cited by 1 | Viewed by 319
Abstract
Capturing space targets by space robots is significant for on-orbit service and is a challenging research topic nowadays. This paper focuses on the dynamics and control of capturing a non-cooperative space target by a space robot with a long flexible manipulator. Firstly, the [...] Read more.
Capturing space targets by space robots is significant for on-orbit service and is a challenging research topic nowadays. This paper focuses on the dynamics and control of capturing a non-cooperative space target by a space robot with a long flexible manipulator. Firstly, the dynamic equation of the flexible space robot is given. The Hertz contact model is used to describe the contact force between the robot and the target. Secondly, an active compliance controller is designed to reduce the capture impact on the robot. Finally, the capture impact on the whole system is analyzed in detail in four scenarios: the combination of two kinds of movement forms and two kinds of relative positions of the robot and the target before capturing. Simulation results indicate that the capturing operation may cause complicated dynamic behaviors such as the vibration of elastic links and the continuous collision of the target. Moreover, the results show that the control method effectively offsets the capture impact on the space robot system. In general, this work lays a theoretical foundation for further study of the dynamic phenomena of the capture process. Full article
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Article
Correlation Analysis and Its Application on an Asymmetry Rotor Structure with Overhang
Appl. Sci. 2021, 11(23), 11501; https://doi.org/10.3390/app112311501 - 04 Dec 2021
Viewed by 330
Abstract
Overhung rotors are widely used in the industrial field. However, compared with normal structure rotors, the prediction and control of overhung rotors cannot achieve good performance. The work aims to investigate the dynamical behaviours of an overhung rotor by means of correlation analysis, [...] Read more.
Overhung rotors are widely used in the industrial field. However, compared with normal structure rotors, the prediction and control of overhung rotors cannot achieve good performance. The work aims to investigate the dynamical behaviours of an overhung rotor by means of correlation analysis, and find its possible application. In this work, based on a real type of rotor, the dynamic model of the rotor with overhang is established by means of the finite element method. Simulation of the dynamic model with different input positions and support stiffnesses is conducted. Based on the methodology of correlation analysis, by introducing a correlation parameter of a proportion of amplitude of measured signal and imbalance mass, the position which has most effect on the vibration is found. Meanwhile, an experiment on the same type of overhung rotor is carried out to validate the results. The numerical results and corresponding experimental results prove that the overhung node has the most effect on the vibration amplitudes of the measured points. Choosing the overhung node to add trial weight, the overhung rotor can be easily balanced. The theory provides an alternative approach to modal analysis which needs more knowledge of the system. Full article
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Article
Scaled Model Simulation and Experimental Verification of Submarine Flexible Pipeline Laying System
Appl. Sci. 2021, 11(21), 10292; https://doi.org/10.3390/app112110292 - 02 Nov 2021
Viewed by 458
Abstract
In order to adapt to the complex and changeable marine environment such as wind, wave, and current, the physical simulation experiment is usually needed in the design of a deep-sea flexible pipeline-laying system. In reality, the flexible pipeline-laying system is very large, and [...] Read more.
In order to adapt to the complex and changeable marine environment such as wind, wave, and current, the physical simulation experiment is usually needed in the design of a deep-sea flexible pipeline-laying system. In reality, the flexible pipeline-laying system is very large, and the experimental cost is huge. Therefore, when analyzing this system, it is necessary to carry out scaled model experiments to verify the rationality of it. Taking the flexible pipeline-laying system working under four-level sea conditions as an example, this paper deduces the similarity criteria of the scaled model according to the similarity theory. According to the required experimental site, the sizes and materials of the model are selected, and then the physical quantities of the model and their similarity ratio corresponding to the prototype are determined. According to the physical quantities of the experimental model, the similarity of dynamic characteristics and structural strength between the model and the prototype are verified by Adams and ANSYS Workbench. The research shows that the scaled model and prototype based on similarity theory can meet the established similarity relationship, and the scaled model experiment is an effective way to verify the rationality of the design of a flexible pipeline-laying system. Full article
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