Vibration Control 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 2022) | Viewed by 27838

Special Issue Editor

Department of Mechanics, Beijing University of Technology, Beijing 100124, China
Interests: nonlinear vibrations; gyroscopic dynamics; vibration control; nonlinear dynamics

Special Issue Information

Dear Colleagues,

We are proud to announce this Special Issue on “Vibration Control and Applications”.

Vibration is probably one of the most difficult things that an engineer deals with on a regular basis. Vibration control plays a critical role in research and industry. There are many types of vibration control techniques such as vibration isolating, vibration absorbing, and metamaterial band stopping that have been developed over the years, from linear to nonlinear analysis.

This Special Issue aims at collecting a set of high-quality works that address the challenges of vibration control (e.g., excited vibration mechanism, vibration isolator, tuned mass damper, vibration energy harvester, and metamaterial) and/or apply these systems to interesting applications (rotors, automobiles, aeroplanes, aerospace, etc.).

We will be glad to receive papers with state-of-the-art reviews, original research ,and real-world applications.

Prof. Dr. Xiao-Dong Yang
Guest Editor

Manuscript Submission Information

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Keywords

  • vibration control
  • nonlinear vibration
  • rotor dynamics
  • vibration isolation
  • tuned mass damper
  • vibratin energy harvester
  • metamaterial
  • vibration application

Published Papers (15 papers)

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Research

18 pages, 1172 KiB  
Article
Analytical Study on the Low-Frequency Vibrations Isolation System for Vehicle’s Seats Using Quasi-Zero-Stiffness Isolator
by Mohammad Abuabiah, Yazan Dabbas, Luqman Herzallah, Ihab H. Alsurakji, Mahmoud Assad and Peter Plapper
Appl. Sci. 2022, 12(5), 2418; https://0-doi-org.brum.beds.ac.uk/10.3390/app12052418 - 25 Feb 2022
Cited by 8 | Viewed by 2952
Abstract
Improving the vibration isolation for the seat of small vehicles under low excitation frequencies is important for providing good comfort for the driver and passengers. Thus, in this study, a compact, low-dynamic, and high-static stiffness vibration isolation system has been designed. A theoretical [...] Read more.
Improving the vibration isolation for the seat of small vehicles under low excitation frequencies is important for providing good comfort for the driver and passengers. Thus, in this study, a compact, low-dynamic, and high-static stiffness vibration isolation system has been designed. A theoretical analysis of the proposed quasi-zero stiffness (QZS) isolator system for vehicle seats is presented. The isolator consists of two oblique springs and a vertical spring to support the load and to achieve quasi-zero stiffness at the equilibrium position. To support any additional load above the supported weight, a sleeve air spring is used. Furthermore, the two oblique springs are equipped with a horizontal adjustment mechanism that is aimed to reach higher frequencies with the existed stroke when a heavy load is applied. The proposed system can be fitted for small vehicles, especially for B-segment and C-segment cars. Finally, the simulation results reveal that the proposed system has a large isolation frequency range compared to that of the linear isolator. Full article
(This article belongs to the Special Issue Vibration Control and Applications)
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18 pages, 6692 KiB  
Article
Active Flutter Suppression and Aeroelastic Response of Functionally Graded Multilayer Graphene Nanoplatelet Reinforced Plates with Piezoelectric Patch
by Jie Chen, Ruofan Han, Dekun Liu and Wei Zhang
Appl. Sci. 2022, 12(3), 1244; https://0-doi-org.brum.beds.ac.uk/10.3390/app12031244 - 25 Jan 2022
Cited by 11 | Viewed by 1526
Abstract
This paper investigates the aeroelastic flutter and vibration reduction of functionally graded (FG) multilayer graphene nanoplatelets (GPLs) reinforced composite plates with piezoelectric patch subjected to supersonic flow. Activated by the control voltage, the piezoelectric patch can generate the active mass and active stiffness [...] Read more.
This paper investigates the aeroelastic flutter and vibration reduction of functionally graded (FG) multilayer graphene nanoplatelets (GPLs) reinforced composite plates with piezoelectric patch subjected to supersonic flow. Activated by the control voltage, the piezoelectric patch can generate the active mass and active stiffness that can accordingly increase the base plate’s stiffness and mass. As a result, it changes the GPLs reinforced plate’s dynamic characteristics. The motion equation of the plate-piezoelectric system is derived through the Hamilton principle. Based on the modified Halpin–Tsai model, the effects of graphene nanoplatelets weight fraction and distribution pattern on the dynamic behaviors of the plate are numerically studied in detail. The result illustrates that adding a few amounts of grapheme nanoplatelets can effectually enhance the aeroelastic properties of the plates. Two kinds of control strategies, including the displacement and acceleration feedback control, are applied to suppress the occurrence of the flutter of the plate. It shows that the displacement and acceleration feedback control can improve the critical flutter Mach number of the plate by attaching active stiffness and active mass, respectively. Furthermore, the combined displacement and acceleration feedback control has a better control effect than that of considering only one of them. Full article
(This article belongs to the Special Issue Vibration Control and Applications)
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20 pages, 6521 KiB  
Article
Rigid-Flexible Coupled Dynamic and Control for Thermally Induced Vibration and Attitude Motion of a Spacecraft with Hoop-Truss Antenna
by Yue Liu, Xin Li, Ying-Jing Qian and Hong-Lei Yang
Appl. Sci. 2022, 12(3), 1071; https://0-doi-org.brum.beds.ac.uk/10.3390/app12031071 - 20 Jan 2022
Cited by 4 | Viewed by 2086
Abstract
As space exploration activities are developing rapidly, spacecraft with large antennas have gained wide acceptance in providing reliable telecommunications and astrophysical observations. In this paper, the dynamic responses and control strategy for a spacecraft with a large hoop-truss antenna under solar flux shock [...] Read more.
As space exploration activities are developing rapidly, spacecraft with large antennas have gained wide acceptance in providing reliable telecommunications and astrophysical observations. In this paper, the dynamic responses and control strategy for a spacecraft with a large hoop-truss antenna under solar flux shock are studied. According to the momentum and angular momentum principle, the rigid-flexible coupled rotational dynamic equation and the translational dynamic equation of the system are established, which include the attitude motion of the rigid main body and the vibration of the antenna. Then, a finite element model of the antenna is established to analytically obtain the corresponding vibration modal shape matrix and natural frequencies. Last, the coupled responses for the attitude motion and vibration are investigated. The corresponding control strategy is designed based on a double-loop structure sliding mode control method. The Lyapunov method is used to demonstrate the global asymptotic stability of the system. Simulations verify the effectiveness of the proposed rigid-flexible coupled model and control strategy. Full article
(This article belongs to the Special Issue Vibration Control and Applications)
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19 pages, 14117 KiB  
Article
Vibration Properties of Dual-Rotor Systems under Base Excitation, Mass Unbalance and Gravity
by Liqiang Chen, Zhenkun Zeng, Dayi Zhang and Jianjun Wang
Appl. Sci. 2022, 12(3), 960; https://0-doi-org.brum.beds.ac.uk/10.3390/app12030960 - 18 Jan 2022
Cited by 6 | Viewed by 1444
Abstract
Rotor systems installed in a transportation system or under seismic excitations are considered to have a moving base. Although extensive research has been conducted on the dynamic behavior of the single-rotor system under base motions, few studies have dealt with the dynamics of [...] Read more.
Rotor systems installed in a transportation system or under seismic excitations are considered to have a moving base. Although extensive research has been conducted on the dynamic behavior of the single-rotor system under base motions, few studies have dealt with the dynamics of dual-rotor systems, especially the counter-rotating dual-rotor systems used in airplane engines. Moreover, mass unbalance and gravity are unavoidable excitations for most rotor systems. Therefore, the vibration properties of a counter-rotating dual-rotor system with the coupled effects of base motions, mass unbalance and gravity are investigated in this paper for the first time. Using the Lagrange principle associated with the finite element method, a general model for dual-rotor systems under base motions was established by using Timoshenko beam elements, leading to a detailed analysis of the natural properties and harmonic responses of the system. The results revealed that different whirling modes (backward, forward or both) may be mutually excited. This research can be helpful for the design and vibration analysis of dual-rotor systems concerned with base motion. Full article
(This article belongs to the Special Issue Vibration Control and Applications)
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16 pages, 6923 KiB  
Article
Dynamic Characteristics Analysis of a Rigid Body System with Spatial Multi-Point Supports
by Qingyu Zhu, Qingkai Han, Xiaodong Yang and Junzhe Lin
Appl. Sci. 2022, 12(2), 746; https://0-doi-org.brum.beds.ac.uk/10.3390/app12020746 - 12 Jan 2022
Cited by 1 | Viewed by 1508
Abstract
This paper presents the dynamic characteristics analysis of a rigid body system with spatial multi-point elastic supports, as well as the sensitivity analysis of support parameters. A rigid object is characterized by six degrees-of-freedom (DOFs) motions and considering the spatial location vector decomposition [...] Read more.
This paper presents the dynamic characteristics analysis of a rigid body system with spatial multi-point elastic supports, as well as the sensitivity analysis of support parameters. A rigid object is characterized by six degrees-of-freedom (DOFs) motions and considering the spatial location vector decomposition of elastic supports, a rigid body system dynamic model with spatial multi-point elastic supports is derived via the Lagrangian energy method. The system modal frequencies are calculated, and to be verified by finite element modal analysis results. Next, based on the above-mentioned model, system modal frequencies are obtained under different support locations, where the support stiffness components are different. Interpolate the stiffness components corresponding to each support location, calculate system modal frequencies, and the response surface model (RSM) for system modal frequencies is established. Further, based on the RSM modal analysis results, the allowable support location for the system modal insensitive area can be obtained. At last, a lubricating oil-tank system with four supports is taken as an example, and the effects of support spatial locations and stiffness components on the system inherent characteristics are discussed. This present work can provide a basis for the dynamic design of the spatial location and stiffness for this type of installation structures. Full article
(This article belongs to the Special Issue Vibration Control and Applications)
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14 pages, 3574 KiB  
Article
A Perturbation Approach for Lateral Excited Vibrations of a Beam-like Viscoelastic Microstructure Using the Nonlocal Theory
by Cheng Li, Chengxiu Zhu, Suihan Sui and Jianwei Yan
Appl. Sci. 2022, 12(1), 40; https://0-doi-org.brum.beds.ac.uk/10.3390/app12010040 - 21 Dec 2021
Cited by 2 | Viewed by 1842
Abstract
In this paper, we investigate the lateral vibration of fully clamped beam-like microstructures subjected to an external transverse harmonic excitation. Eringen’s nonlocal theory is applied, and the viscoelasticity of materials is considered. Hence, the small-scale effect and viscoelastic properties are adopted in the [...] Read more.
In this paper, we investigate the lateral vibration of fully clamped beam-like microstructures subjected to an external transverse harmonic excitation. Eringen’s nonlocal theory is applied, and the viscoelasticity of materials is considered. Hence, the small-scale effect and viscoelastic properties are adopted in the higher-order mathematical model. The classical stress and classical bending moments in mechanics of materials are unavailable when modeling a microstructure, and, accordingly, they are substituted for the corresponding effective nonlocal quantities proposed in the nonlocal stress theory. Owing to an axial elongation, the nonlinear partial differential equation that governs the lateral motion of beam-like viscoelastic microstructures is derived using a geometric, kinematical, and dynamic analysis. In the next step, the ordinary differential equations are obtained, and the time-dependent lateral displacement is determined via a perturbation method. The effects of external excitation amplitude on excited vibration are presented, and the relations between the nonlocal parameter, viscoelastic damping, detuning parameter, and the forced amplitude are discussed. Some dynamic phenomena in the excited vibration are revealed, and these have reference significance to the dynamic design and optimization of beam-like viscoelastic microstructures. Full article
(This article belongs to the Special Issue Vibration Control and Applications)
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13 pages, 3008 KiB  
Article
A Hybrid Nonlinear Active Control Strategy Combining Dry Friction Control and Nonlinear Velocity Compensation Control
by Donglai Yang, Xingrong Huang and Xiaodong Yang
Appl. Sci. 2021, 11(24), 11670; https://0-doi-org.brum.beds.ac.uk/10.3390/app112411670 - 09 Dec 2021
Viewed by 1080
Abstract
Friction dampers are widely used in structural vibration suppression in various fields, such as aeronautics, astronautics, robotics, precision manufacturing, etc. Traditional friction dampers are mainly used in a passive way to optimize vibration suppression with an immutable pressure around certain excitation. In this [...] Read more.
Friction dampers are widely used in structural vibration suppression in various fields, such as aeronautics, astronautics, robotics, precision manufacturing, etc. Traditional friction dampers are mainly used in a passive way to optimize vibration suppression with an immutable pressure around certain excitation. In this manuscript, a hybrid control strategy by considering both the friction force in the active control law and a nonlinear velocity compensation force is put forward: First, the normal force applied on the friction damper was adjusted to ensure its vibration reduction effect under different excitation for a first passive control; second, the active control law was established by combining the dry friction force and the velocity control force in the state space; lastly, the stability of the nonlinear control law was determined by Lyapunov criterion. Numerical simulations were conducted on a three degree-of-freedom system (3-DOF) based on the proposed hybrid control strategy, to show the control efficiency in vibration suppression and economic efficiency in energy input into the system. Simulation results showed that the proposed control law could reduce the amplitude of the active control force by about 5% without degrading the control efficiency. Full article
(This article belongs to the Special Issue Vibration Control and Applications)
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19 pages, 7828 KiB  
Article
Modal Parameter Identification of Structures Using Reconstructed Displacements and Stochastic Subspace Identification
by Xiangying Guo, Changkun Li, Zhong Luo and Dongxing Cao
Appl. Sci. 2021, 11(23), 11432; https://0-doi-org.brum.beds.ac.uk/10.3390/app112311432 - 02 Dec 2021
Cited by 5 | Viewed by 1993
Abstract
A method of modal parameter identification of structures using reconstructed displacements was proposed in the present research. The proposed method was developed based on the stochastic subspace identification (SSI) approach and used reconstructed displacements of measured accelerations as inputs. These reconstructed displacements suppressed [...] Read more.
A method of modal parameter identification of structures using reconstructed displacements was proposed in the present research. The proposed method was developed based on the stochastic subspace identification (SSI) approach and used reconstructed displacements of measured accelerations as inputs. These reconstructed displacements suppressed the high-frequency component of measured acceleration data. Therefore, in comparison to the acceleration-based modal analysis, the operational modal analysis obtained more reliable and stable identification parameters from displacements regardless of the model order. However, due to the difficulty of displacement measurement, different types of noise interferences occurred when an acceleration sensor was used, causing a trend term drift error in the integral displacement. A moving average low-frequency attenuation frequency-domain integral was used to reconstruct displacements, and the moving time window was used in combination with the SSI method to identify the structural modal parameters. First, measured accelerations were used to estimate displacements. Due to the interference of noise and the influence of initial conditions, the integral displacement inevitably had a drift term. The moving average method was then used in combination with a filter to effectively eliminate the random fluctuation interference in measurement data and reduce the influence of random errors. Real displacement results of a structure were obtained through multiple smoothing, filtering, and integration. Finally, using reconstructed displacements as inputs, the improved SSI method was employed to identify the modal parameters of the structure. Full article
(This article belongs to the Special Issue Vibration Control and Applications)
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12 pages, 5738 KiB  
Article
Theoretical Investigation on the Impact of Two HDR Dampers on First Modal Damping Ratio of Stay Cable
by Duy Thao Nguyen, Duy Hung Vo and Md. Naimul Haque
Appl. Sci. 2021, 11(22), 10985; https://0-doi-org.brum.beds.ac.uk/10.3390/app112210985 - 19 Nov 2021
Cited by 3 | Viewed by 1450
Abstract
Stay cables are one of the vital components of a cable-stayed bridge. Due to their flexible nature, stay cables are vulnerable to external excitation and often vibrate with large amplitude under wind action which leads to the fatigue failure of the cables. To [...] Read more.
Stay cables are one of the vital components of a cable-stayed bridge. Due to their flexible nature, stay cables are vulnerable to external excitation and often vibrate with large amplitude under wind action which leads to the fatigue failure of the cables. To suppress such kind of large amplitude vibration by improving the damping ratio of the cable various dampers such as magnetorheological damper, friction damper; oil damper; or high damping rubber (HDR) damper are utilized and gained popularity over time. This paper focuses on improving the damping ratio of stay cables using a combination of two HDR dampers. First, the theoretical model is formulated considering cable bending stiffness to evaluate the damping effect of cable-HDR dampers system. Then, the impact of various design parameters of HDR dampers on cable damping considering the cable stiffness is performed. The comparative analysis of results shows that the considered parameters such as loss factor, spring factor, and installation location of dampers have much effect on the stay cables damping ratio. Finally, the optimal parameters of the two HDR dampers are proposed for damper design. Full article
(This article belongs to the Special Issue Vibration Control and Applications)
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12 pages, 3771 KiB  
Article
Post-Buckling Spring Vibration Isolator Using Silicone Gel Column: A Theoretical and Experimental Study
by Ji-Hou Yang, Xiao-Dong Yang, Qing-Kai Han and Jin-Guo Liu
Appl. Sci. 2021, 11(22), 10559; https://0-doi-org.brum.beds.ac.uk/10.3390/app112210559 - 10 Nov 2021
Cited by 3 | Viewed by 1441
Abstract
Based on the design of a post-buckling silicone gel column (SGC), a novel type of low-frequency vibration isolator is presented, and the vibration isolation performance of this isolator is studied by combining theoretical analysis and experimental verification. The stiffness characteristics of the post-buckling [...] Read more.
Based on the design of a post-buckling silicone gel column (SGC), a novel type of low-frequency vibration isolator is presented, and the vibration isolation performance of this isolator is studied by combining theoretical analysis and experimental verification. The stiffness characteristics of the post-buckling SGC are derived, and its recovery force curves with different parameters are analyzed using two kinds of elliptic integral functions. Displacement transmissibility is formulated using harmonic balance method (HBM), and the influences of the excitation amplitude, damping ratio, SGC section diameter, and Young’s modulus are discussed in terms of the transmissibility. The performance of the SGC system is verified through a series of experimental studies based on the developed experimental prototype. The result shows that the proposed post-buckling spring vibration isolator has a good vibration isolation effect, especially in the low-frequency domain, which may provide a feasible novel design idea for a low-frequency vibration isolator. Full article
(This article belongs to the Special Issue Vibration Control and Applications)
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18 pages, 2456 KiB  
Article
Phononic Band Gap and Free Vibration Analysis of Fluid-Conveying Pipes with Periodically Varying Cross-Section
by Hao Yu, Feng Liang, Yu Qian, Junjie Gong, Yao Chen and An Gao
Appl. Sci. 2021, 11(21), 10485; https://0-doi-org.brum.beds.ac.uk/10.3390/app112110485 - 08 Nov 2021
Cited by 9 | Viewed by 2075
Abstract
Phononic crystals (PCs) are a novel class of artificial periodic structure, and their band gap (BG) attributes provide a new technical approach for vibration reduction in piping systems. In this paper, the vibration suppression performance and natural properties of fluid-conveying pipes with periodically [...] Read more.
Phononic crystals (PCs) are a novel class of artificial periodic structure, and their band gap (BG) attributes provide a new technical approach for vibration reduction in piping systems. In this paper, the vibration suppression performance and natural properties of fluid-conveying pipes with periodically varying cross-section are investigated. The flexural wave equation of substructure pipes is established based on the classical beam model and traveling wave property. The spectral element method (SEM) is developed for semi-analytical solutions, the accuracy of which is confirmed by comparison with the available literature and the widely used transfer matrix method (TMM). The BG distribution and frequency response of the periodic pipe are attained, and the natural frequencies and mode shapes are also obtained. The effects of some critical parameters are discussed. It is revealed that the BG of the present pipe system is fundamentally induced by the geometrical difference of the substructure cross-section, and it is also related to the substructure length and fluid–structure interaction (FSI). The number of cells does not contribute to the BG region, while it has significant effects on the amplitude attenuation, higher order natural frequencies and mode shapes. The impact of FSI is more evident for the pipes with smaller numbers of cells. Moreover, compared with the conventional TMM, the present SEM is demonstrated more effective for comprehensive analysis of BG characteristics and free vibration of PC dynamical structures. Full article
(This article belongs to the Special Issue Vibration Control and Applications)
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13 pages, 2759 KiB  
Article
Response Statistics of a Shape Memory Alloy Oscillator with Random Excitation
by Rong Guo, Qi Liu, Junlin Li and Yong Xu
Appl. Sci. 2021, 11(21), 10175; https://0-doi-org.brum.beds.ac.uk/10.3390/app112110175 - 29 Oct 2021
Cited by 1 | Viewed by 1291
Abstract
This paper aimed to explore analytically the influences of random excitation on a shape memory alloy (SMA) oscillator. Firstly, on the basis of the deterministic SMA model under a harmonic excitation, we introduce a stochastic SMA model with a narrow-band random excitation. Subsequently, [...] Read more.
This paper aimed to explore analytically the influences of random excitation on a shape memory alloy (SMA) oscillator. Firstly, on the basis of the deterministic SMA model under a harmonic excitation, we introduce a stochastic SMA model with a narrow-band random excitation. Subsequently, a theoretical analysis for the proposed SMA model was achieved through a multiple-scale method coupled with a perturbation technique. All of the obtained approximate analytical solutions were verified by numerical simulation results, and good agreements were observed. Then, effects of the random excitation and the temperature value on the system responses were investigated in detail. Finally, we found that stochastic switch and bifurcation can be induced by the random fluctuation, which were further illustrated through time history and steady-state probability density function. These results indicate that the random excitation has a significant impact on dynamics of the SMA model. This research provides a certain theoretical basis for the design and vibration control of the SMA oscillator in practical application. Full article
(This article belongs to the Special Issue Vibration Control and Applications)
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14 pages, 20316 KiB  
Article
Response Analysis of the Tristable Energy Harvester with an Uncertain Parameter
by Ying Zhang, Xiaxia Duan, Yu Shi and Xiaole Yue
Appl. Sci. 2021, 11(21), 9979; https://0-doi-org.brum.beds.ac.uk/10.3390/app11219979 - 25 Oct 2021
Cited by 4 | Viewed by 1465
Abstract
In the stage of modelling, measuring, mechanical processing and manufacturing of the nonlinear energy harvesting system, deviations and errors of system parameters are inevitable. Even slight variation of key parameters may have a significant influence on the output voltages, especially for the multi-stable [...] Read more.
In the stage of modelling, measuring, mechanical processing and manufacturing of the nonlinear energy harvesting system, deviations and errors of system parameters are inevitable. Even slight variation of key parameters may have a significant influence on the output voltages, especially for the multi-stable nonlinear case. Therefore, the investigation of dynamic behaviors for the tristable energy harvesting system with uncertain parameters is of important value both for research and application. In this paper, the uncertainty of a tristable piezoelectric vibration energy harvester with a random coefficient ahead of the nonlinear term is studied. By using the Chebyshev polynomial approximation, this tristable energy harvesting system is first reduced into an equivalent deterministic form, the ensemble mean responses of which are derived to exhibit the stochastic behaviors. The periodic and chaotic motions, bifurcations and crises under different conditions are analyzed. The results show that the output voltage is sensitive to the uncertainty of the nonlinear coefficient, which leads to unstable behavior around the bifurcation and crisis points particularly. Exploring the influence pattern of uncertain parameters on the output voltage and avoiding the unstable parameter intervals are essential for optimizing the structure. It can further improve the efficiency of the nonlinear energy harvesting system. Full article
(This article belongs to the Special Issue Vibration Control and Applications)
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17 pages, 6573 KiB  
Article
Simulation and Experimental Analysis of Pressure Pulsation Characteristics of Pump Source Fluid
by Junzhe Lin, Yuanyuan Wang, Shenghao Zhou, Wenjie Wu, Hui Ma and Qingkai Han
Appl. Sci. 2021, 11(20), 9559; https://0-doi-org.brum.beds.ac.uk/10.3390/app11209559 - 14 Oct 2021
Cited by 4 | Viewed by 2122
Abstract
The output flow pulsation characteristics of the hydraulic pump due to the structural characteristics may cause pump source fluid pressure pulsation and even cause the equipment to vibrate, which will affect the life and working reliability of the equipment. Scholars have done a [...] Read more.
The output flow pulsation characteristics of the hydraulic pump due to the structural characteristics may cause pump source fluid pressure pulsation and even cause the equipment to vibrate, which will affect the life and working reliability of the equipment. Scholars have done a lot of theoretical and simulation analysis on the characteristics of fluid flow and pressure pulsation caused by the specific structure and structure of the plunger pump, but there are few comparisons and analyses of the simplified model of the plunger pump and the pressure pulsation characteristics with experiments. In this paper, AMESim software is utilized to establish a simplified model of one seven-plunger hydraulic pump, and simulate and analyze the pump source fluid pressure pulsation characteristics of different system load pressures at a constant speed. An experimental platform for testing pump fluid pressure pulsation was designed and built, and the actual measurement and simulation results of pump fluid pressure pulsation were compared and analyzed. The results show that the system simulation data is in good agreement with the measured data, which verifies the correctness of the simplified model of the plunger pump. At the same time, it is found that the fluid pressure pulsation of the pump source exhibits broadband and multi-harmonic characteristics. At a constant speed, as the load pressure of the hydraulic system increases, the pump source fluid pressure pulsation amplitude increases, the pressure pulsation rate decreases, and the impact on the fundamental frequency amplitude is the most significant. The research results can provide a theoretical basis for suppressing the pressure pulsation of the pump source fluid and reducing the vibration response of a hydraulic pipeline under the action of the pulsating harmonic excitation. Full article
(This article belongs to the Special Issue Vibration Control and Applications)
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16 pages, 32124 KiB  
Article
Dynamic Response of Dual-Disk Rotor System with Uncertainties Based on Chebyshev Convex Method
by Jing Wang, Yongfeng Yang, Qingyang Zheng, Wangqun Deng, Desheng Zhang and Chao Fu
Appl. Sci. 2021, 11(19), 9146; https://0-doi-org.brum.beds.ac.uk/10.3390/app11199146 - 01 Oct 2021
Cited by 6 | Viewed by 1742
Abstract
In this paper, a non-probabilistic Chebyshev convex method (CCM) for the transient dynamics of a dual-disk rotor system with uncertain parameters is proposed. The dynamic equation of the dual-disk rotor system is derived by the finite element method (FEM), and the deterministic response [...] Read more.
In this paper, a non-probabilistic Chebyshev convex method (CCM) for the transient dynamics of a dual-disk rotor system with uncertain parameters is proposed. The dynamic equation of the dual-disk rotor system is derived by the finite element method (FEM), and the deterministic response is obtained. Then the CCM is used to obtain the uncertain transient responses of the dual-disk rotor system. The amplitude ranges and response characteristics are quite close to the calculation results of the convex Monte Carlo simulation (CMCS), which verifies the accuracy and validity of the CCM. The experimental results demonstrate that the proposed method has good performance in the uncertainty analysis of the rotor system. More importantly, the results will be helpful to understand the dynamic behavior of dual-disk rotor systems with uncertainties and provide guidance for robust design and analysis. Full article
(This article belongs to the Special Issue Vibration Control and Applications)
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