Structural Vibration: Analysis, Control, Experiment, and Applications

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 January 2021) | Viewed by 6651

Special Issue Editor


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Guest Editor
Mechanical Engineering Department, National Yang Ming Chiao Tung University, Hsin Chu 300, Taiwan
Interests: reliability engineering; mechanics of composite materials structures; fracture mechanics; experimental mechanics; optimal design
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Special Issue Information

Dear Colleagues,

A structure will exhibit vibration when subjected to time-varying loads. The structural vibration may produce prominent effects on the integrity/performance of the structure. Structural vibration plays an important role and must be dealt with properly in the design/fabrication of the structures used in, for instance, aerospace, aircraft, automotive, audio, mechanical, micro-electromechanical systems, etc. The scope of structural vibration covered in this Special Issue shall include, but is not limited to, topics of analysis, control, experiment, and applications. It is important to have accurate mathematical methods to predict the actual vibrational behaviors of different types of structures if meaningful assessments of the integrity of the structures are desired. On the other hand, the control of the vibration of a structure in a proper way can enhance the performance or ensure the integrity of the structure. Therefore, the development of efficient and effective techniques for structural vibration control has become an important topic of research. The use of appropriate experimental techniques in vibration testing is essential if the actual responses of a structure are to be identified. The experimental data can be used to validate the suitability of the theoretical methods for vibration analysis and control. Regarding the quality assurance or health monitoring of a structure, the vibration data measured during operation can be used to, for instance, identify the material properties or assess the health condition of the structure. Therefore, vibration data are precious information that can be used to solve practical engineering problems. The structural vibration of, for instance, micro-electromechanical systems can be applied to perform some specific tasks in which micro-manipulation is one of the examples. Because structural vibration has long been an important area of research, it is appropriate at this time to conduct an extensive review of the state of the art. Thus, we are seeking papers that will enrich our knowledge of structural vibration.

Prof. Dr. Tai-Yan Kam
Guest Editor

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Keywords

  • structural vibration
  • vibroacoustics
  • vibration control
  • vibration analysis
  • vibration testing
  • damping
  • vibration measurement
  • system identification

Published Papers (2 papers)

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Research

23 pages, 8992 KiB  
Article
Model Updating Using Frequency Response Functions Based on Sherman–Morrison Formula
by Yimeng Wu, Rui Zhu, Zhifu Cao, Ying Liu and Dong Jiang
Appl. Sci. 2020, 10(14), 4985; https://doi.org/10.3390/app10144985 - 20 Jul 2020
Cited by 12 | Viewed by 2398
Abstract
Model updating plays an important role in dynamics modeling with high accuracy, which is widely used in mechanical engineering. In this paper, a model updating method using frequency response function (FRF) is proposed based on Sherman–Morrison formula, in which only the initial FRFs [...] Read more.
Model updating plays an important role in dynamics modeling with high accuracy, which is widely used in mechanical engineering. In this paper, a model updating method using frequency response function (FRF) is proposed based on Sherman–Morrison formula, in which only the initial FRFs and parameter perturbations are employed to calculate the sensitivity avoiding repeated finite element (FE) analyses and improving the computational efficiency. Firstly, the sensitivity of FRFs to the design parameters is calculated by Sherman–Morrison formula based on the QR decomposition of the system dynamic stiffness matrix variation after parameter perturbations, then the influence of damping on the amplitude of FRFs is considered to select an appropriate frequency range, and finally conduct the model updating according to the sensitivity of the FRFs. By employing simulation examples of a truss and a solar wing and the experiment of an aluminum frame, the updating error is still within ±1.00% in the condition of 5% random white noise, which shows the proposed method has high accuracy and a certain anti-noise capability. When only a few numbers of frequency points are selected near the resonance peak of the FRFs, the result shows that selecting the appropriate frequency range and points can reduce the computational cost. The results of the experiment study show that the proposed method can effectively identify the structural parameters. The above results verify the feasibility and effectiveness of proposed model updating method using FRFs. Full article
(This article belongs to the Special Issue Structural Vibration: Analysis, Control, Experiment, and Applications)
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17 pages, 5507 KiB  
Article
Vibration Diagnosis of Sand Units in a Stone Crusher Plant: An On-Site Field Test
by Seong-Hwan Kim, Bo-Gyu Kim, Dong-Soo Jung, Seung-Bok Choi, Jong-Mu Lee and Kyu-Bong Lee
Appl. Sci. 2020, 10(12), 4327; https://doi.org/10.3390/app10124327 - 24 Jun 2020
Cited by 2 | Viewed by 3302
Abstract
Due to the shortage of natural sand from rivers and seas, artificial sand production from large stones or rocks is being increased. However, this sand manufacturing process is dangerous and causes several social problems such as a high level of unwanted vibrations or [...] Read more.
Due to the shortage of natural sand from rivers and seas, artificial sand production from large stones or rocks is being increased. However, this sand manufacturing process is dangerous and causes several social problems such as a high level of unwanted vibrations or noises. This study investigates the vibration characteristics of sand and screen units in an artificial sand production plant whose operation is multiple with several actuators different exciting frequencies. As a first step, vibration levels are measured at the sand and screen unit positions using accelerometers in time and frequency domains. The measurement is carried out at two different conditions: activating only the sand unit and operating entire facilities such as a stone crusher. Vibration signals acquired from several locations of the sand and screen units of the plant are collected and analyzed from waveforms and spectrums of the signals. We identified that the vibration acceleration level of the screen unit is higher than that of the sand unit. In addition, it is found from the acceleration signals measured at the plant office and shipping control center (which are far away from the plant location) that the beating phenomenon arose due to close driving frequencies for several sand units. In this work, the vibration caused from the beating is significantly reduced by adjusting the driving frequencies for the sand units so that they are sufficiently scattered to avoid the beating. Full article
(This article belongs to the Special Issue Structural Vibration: Analysis, Control, Experiment, and Applications)
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