Journal of Sound and Vibration最新文献_第2页

Railway rolling noise in curved tracks: Dynamic modelling of the wheelset and influence of the curve 弯轨中的铁路滚动噪音：轮对动态建模和曲线的影响

IF 4.3 2区工程技术

Journal of Sound and Vibration Pub Date : 2024-09-14 DOI: 10.1016/j.jsv.2024.118738

引用次数: 0

Analysis on the vibration signals of a novel double-disc crack rotor-bearing system with single defect in inner race 带内滚道单一缺陷的新型双盘裂纹转子轴承系统的振动信号分析

IF 4.3 2区工程技术

Journal of Sound and Vibration Pub Date : 2024-09-13 DOI: 10.1016/j.jsv.2024.118729

{"title":"Analysis on the vibration signals of a novel double-disc crack rotor-bearing system with single defect in inner race","authors":"","doi":"10.1016/j.jsv.2024.118729","DOIUrl":"10.1016/j.jsv.2024.118729","url":null,"abstract":"<div><p>Previous studies have paid little attention to the dynamic modeling of multi-fault systems with both bearing defect and cracked rotor. In the current research, a double-disc rotor model with a breathing crack and fault bearing was established using the finite element method (FEM). The dual-impulse phenomenon associated with inner race defect was addressed as a time-varying external excitation. The effects of varying crack depths and inner race spall lengths were further investigated. The maximum error between simulation and experiment was found to be less than 5% for the dual-impulse time spacing. The calculated results indicate that the inner race defect causes a slight increase in the rotational frequency <em>f</em><sub>rotor</sub> and 2<em>f</em><sub>rotor</sub>, followed by a decrease in the 3<em>f</em><sub>rotor</sub> at low speeds, as observed using Fast Fourier Transform (FFT) and Short-Time Fourier Transform (STFT). The influence of changes in crack depth is greater than the bearing defect in the system, a finding that is also confirmed at 1/2 critical speed. The phenomenon of frequency modulation observed in the simulation was also verified experimentally. The ball passing frequency on inner raceway <em>f</em><sub>BPFI</sub>, <em>f</em><sub>rotor</sub> and mixed frequency components can be used to distinguish whether there is inner race defect.</p></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142240225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nonlinear characteristics and radial-bending-torsional vibration of a blade with breathing crack 带呼吸裂纹叶片的非线性特性和径向弯曲扭转振动

IF 4.3 2区工程技术

Journal of Sound and Vibration Pub Date : 2024-09-13 DOI: 10.1016/j.jsv.2024.118734

{"title":"Nonlinear characteristics and radial-bending-torsional vibration of a blade with breathing crack","authors":"","doi":"10.1016/j.jsv.2024.118734","DOIUrl":"10.1016/j.jsv.2024.118734","url":null,"abstract":"<div><p>Rotor failures due to cracked blades are frequently observed in rotating machinery. The identification of cracking state of rotating blade based on vibration characteristics has garnered a lot of attention. However, nonlinear characteristics and vibration combining in radial, bending and torsional directions of a rotating blade induced by the crack breathing is yet not clear. This paper proposes a radial-bending-torsional dynamic model of rotating blade with breathing crack. A time-varying integration method is proposed for determining the crack state based on the strain energy release rate. The crack breathing behavior is described by Boolean operation and the numerical integration are applied to open or close the crack. The model is validated through modal analysis, vibration responses and contact state of crack surface. Frequency veering is changed between the 2nd flap and 1st edgewise frequency due to the existence of crack. Strong nonlinear behaviors are found in the radial and torsional vibrations because of the crack breathing. Nonlinearities are also found in the combined vibrations between the radial-bending and the bending-torsional directions. Radial and torsional vibration amplitude levels can be used as an indication of blade crack failure, but the applicability depends on the absolute response decided by the aerodynamic excitation and resonant vibration. These findings can serve as guidance in crack identification and cracking state monitoring of rotating blades.</p></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142240224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Aeroacoustics research in Europe: The CEAS-ASC report on 2023 highlights 欧洲的航空声学研究：CEAS-ASC关于2023年的重点报告

IF 4.3 2区工程技术

Journal of Sound and Vibration Pub Date : 2024-09-12 DOI: 10.1016/j.jsv.2024.118732

{"title":"Aeroacoustics research in Europe: The CEAS-ASC report on 2023 highlights","authors":"","doi":"10.1016/j.jsv.2024.118732","DOIUrl":"10.1016/j.jsv.2024.118732","url":null,"abstract":"<div><p>The Council of European Aerospace Societies (CEAS) Aeroacoustics Specialists Committee (ASC) supports and promotes the interests of the scientific and industrial aeroacoustics community on a European scale and European aeronautics activities internationally. In this context, “aeroacoustics” encompasses all aerospace acoustics and related areas. Each year the committee highlights some of the research and development projects in Europe.</p><p>This paper is a report on highlights of aeroacoustics research in Europe in 2023, compiled from information provided to the ASC of the CEAS. In addition, during 2023, a number of research programmes involving aeroacoustics were funded by the European Commission. Some of the highlights from these programmes are also summarized in this article, as well as highlights from other projects funded by national governments and industry.</p><p>Contributions are gathered in sections by topic, and a section covering relevant European scientific events in 2023 is also included. Enquiries concerning all contributions should be addressed to the authors who are given at the end of each subsection.</p></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0022460X24004942/pdfft?md5=91d6e4bb4112c432a2fc068f27a1ba7b&pid=1-s2.0-S0022460X24004942-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142238354","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of rotation speed fluctuation on rotor noise generation: A numerical and experimental study 转速波动对转子噪声产生的影响：数值和实验研究

IF 4.3 2区工程技术

Journal of Sound and Vibration Pub Date : 2024-09-11 DOI: 10.1016/j.jsv.2024.118717

{"title":"Effect of rotation speed fluctuation on rotor noise generation: A numerical and experimental study","authors":"","doi":"10.1016/j.jsv.2024.118717","DOIUrl":"10.1016/j.jsv.2024.118717","url":null,"abstract":"<div><div>The practical operations of rotors for unmanned aircraft systems can undergo time-varying rotation speeds due to various uncertainty factors. This work investigates the aeroacoustic effect of the rotor’s rotation speed fluctuation using both numerical and experimental approaches. The measured real-time angular speed signal reveals that a hovering rotor experiences highly deterministic rotation speed variations in one revolution, which are closely related to the motor property. Delayed detached eddy simulations are performed, and the fluctuating rotation speed is realized by controlling the mesh displacement at each time step. The results suggest that significant additional tones are produced at the excitation frequency and neighbour frequencies, even though the amplitudes of the rotation speed fluctuations at the dominant frequencies are much smaller than the mean rotation speed. By comparing the full signal to individual harmonic components, it is found that the phase difference between each mode is unimportant. Therefore, the total aeroacoustic effect can be regarded as a linear superposition of different harmonic components. Aeroacoustic source analysis is also performed to isolate the contribution of various source types and correlate the far-field noise with the near-field source distribution. The results show that the extra tonal noise is mostly dominated by the loading noise, with a weaker contribution from the thickness noise. The agreement between the experiments and the simulations indicates that the rotation speed fluctuation is likely responsible for the generation of middle-frequency tonal noise at harmonics of the blade passing frequency.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142319561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A data-driven technique for discovering the dynamical system with rigid impact characteristic 发现具有刚性冲击特性的动力系统的数据驱动技术

IF 4.3 2区工程技术

Journal of Sound and Vibration Pub Date : 2024-09-11 DOI: 10.1016/j.jsv.2024.118727

{"title":"A data-driven technique for discovering the dynamical system with rigid impact characteristic","authors":"","doi":"10.1016/j.jsv.2024.118727","DOIUrl":"10.1016/j.jsv.2024.118727","url":null,"abstract":"<div><p>We propose a data-driven technique for discovering the equation of motion of the dynamical system with rigid impact. The method first discovers a dynamical system close to impact by the Fourier series with a high rate of convergence, known as the double-even extended series. Then, we use the system to construct an impact mapping, which maps the data close to impact to an estimated impact instant. By minimizing the error of impact mapping, we find the location of impact surface and energy lost during impact that generally satisfies the data close to impact. Finally, we discover the equation of motion without impact by the double-even extended series The analyzed data can be collected at equal time intervals with measurement error, and there is no need to deliberately collect data at the impact instant. The technique is able to capture the impact characteristic when there is a lack of knowledge about the critical changes of the dynamics at the impact instant and the non-linear dynamical behaviors without impact. We test the identification ability of the new technique using impact dynamical systems connected with cubic damping term and strong non-linear damping, respectively. The identified systems accurately capture impact dynamics such as the long-time prediction with impact, multistable dynamical phenomenon, and chattering dynamics.</p></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142238484","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High-dimensional nonlinear flutter suppression of variable thickness porous sandwich conical shells based on nonlinear energy sink 基于非线性能量沉降的变厚度多孔夹层锥形壳的高维非线性扑动抑制

IF 4.3 2区工程技术

Journal of Sound and Vibration Pub Date : 2024-09-08 DOI: 10.1016/j.jsv.2024.118731

{"title":"High-dimensional nonlinear flutter suppression of variable thickness porous sandwich conical shells based on nonlinear energy sink","authors":"","doi":"10.1016/j.jsv.2024.118731","DOIUrl":"10.1016/j.jsv.2024.118731","url":null,"abstract":"<div><p>Nonlinear energy sink (NES) is widely applied in engineering field due to the advantages of light weight, high robustness, unidirectional energy transfer, rapid and broadband vibration isolation. In this paper, nonlinear energy sink is utilized to suppress vibration of the variable thickness porous sandwich conical shells for the first time, and the high-dimensional nonlinear flutter suppression characteristics of the system of simply supported variable stiffness truncated porous sandwich conical shell coupled NES under aerodynamic force and thermal stress are investigated. By applying the first-order shear deformation theory (FSDT), Hamilton's principle and Galerkin technique, the high-dimensional nonlinear ordinary differential flutter suppression equations of the system appended with NES are established. The accuracy of the theoretical approach is ensured by the comparison of frequency results, while the NES dissipated kinetic energy ratio and the comparison of NES performance with other suppression systems are presented to prove the effectiveness of NES on nonlinear flutter suppression. The time history diagrams and limit cycle oscillation (LCO) amplitude curves, which reflect the high-dimensional nonlinear flutter suppression effect of NES, are obtained by employing the Runge-Kutta method. The effects of aerodynamic pressure, the parameters and positions of single NES, and the positions of parallel NES and series NES on the high-dimensional nonlinear flutter suppression characteristics of the system attached with NES are discussed in depth. Finally, the optimal high-dimensional nonlinear flutter suppression scheme is arrived.</p></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142229695","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multiscale modeling of microstructural and hygrothermal effects on vibrations of CNT-enhanced fiber-reinforced polymer composites 微结构和湿热效应对 CNT 增强纤维聚合物复合材料振动的多尺度建模

IF 4.3 2区工程技术

Journal of Sound and Vibration Pub Date : 2024-09-07 DOI: 10.1016/j.jsv.2024.118733

{"title":"Multiscale modeling of microstructural and hygrothermal effects on vibrations of CNT-enhanced fiber-reinforced polymer composites","authors":"","doi":"10.1016/j.jsv.2024.118733","DOIUrl":"10.1016/j.jsv.2024.118733","url":null,"abstract":"<div><p>This work presents a multi-scale analytical and computational approach designed to predict the hygro-thermo-mechanical vibrational response of laminated composite structures reinforced with multi-walled carbon nanotubes (MWCNTs). Employing the modified Halpin-Tsai model, this study estimates the elastic properties of the MWCNT-enhanced epoxy matrix, incorporating the impacts of MWCNT agglomeration, orientation, waviness, and size-dependent characteristics. Additionally, the Chamis micromechanical model is utilized to ascertain the independent elastic constants of the nanocomposite lamina, considering environmental variables such as temperature and humidity. Subsequent analysis involves the determination of natural frequencies for both pristine and MWCNT-integrated laminated composite structures via the Finite Element Method (FEM), addressing various design-related parameters. This investigation further explores the macroscopic influences of MWCNT incorporation, boundary condition and layup scheme, along with the temperature, moisture content, and the nanoscopic impact of MWCNTs on the natural frequencies of laminated composite plates. The obtained results of the proposed multiscale modeling are compared with experimental and theoretical observations. It has been demonstrated that while the incorporation of carbon nanotubes (CNTs) can enhance the mechanical properties of nanocomposite laminae, the natural frequencies of these nanocomposite plates are adversely affected by variations in temperature and moisture content. Furthermore, the findings indicate that the microstructural characteristics of CNTs play a crucial role in determining the efficacy of the reinforcement phenomenon. The developed multi-scale methodological framework offers significant potential for the design and optimization of MWCNT-based composite structures across diverse industries, including automotive and aerospace sectors.</p></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142230085","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Vortex-Induced Vibration (VIV) of flexible riser conveying severe slugging and straight flow in steady and oscillatory flows 在稳定流和振荡流中输送严重淤积和直流的柔性立管的涡流诱导振动 (VIV)

IF 4.3 2区工程技术

Journal of Sound and Vibration Pub Date : 2024-09-07 DOI: 10.1016/j.jsv.2024.118728

{"title":"Vortex-Induced Vibration (VIV) of flexible riser conveying severe slugging and straight flow in steady and oscillatory flows","authors":"","doi":"10.1016/j.jsv.2024.118728","DOIUrl":"10.1016/j.jsv.2024.118728","url":null,"abstract":"<div><div>This paper aims to investigate dynamic characteristics of Vortex-Induced Vibration (VIV) of a flexible riser conveying severe slug flow and straight flow in steady and oscillatory flows. Firstly, a classical wake oscillator model is adopted to simulate the coupling effects between internal and external flows on dynamic characteristics of VIV and an improved wake oscillator model is developed to calculate responses of VIV in oscillatory flow. A two-dimensional (2D) Computational Fluid Dynamics (CFD) model is developed to predict the behavior of severe slug flow. Then, structural equations of riser are discretized by adopting central difference method, and the Runge-Kuta method is adopted to solve them and the wake oscillator equations. The results show that characteristics of VIV, including root mean square (RMS) of displacement, dominant modes and vibration frequencies of riser conveying severe slugging differ significantly from those of riser conveying straight flow. New mode responses are triggered and multi-frequency phenomenon is observed due to severe slug flow. In addition, responses of VIV of riser conveying severe slug flow are influenced by the variation of the velocity or oscillation intensity of external flow. Model transition is normally triggered with a high-velocity sheared flow or a high Keulegan-Carpenter (KC) number.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142319560","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Probabilistic regularization load reconstruction method based on iterative strategy 基于迭代策略的概率正则化负载重建方法

IF 4.3 2区工程技术

Journal of Sound and Vibration Pub Date : 2024-09-06 DOI: 10.1016/j.jsv.2024.118719

{"title":"Probabilistic regularization load reconstruction method based on iterative strategy","authors":"","doi":"10.1016/j.jsv.2024.118719","DOIUrl":"10.1016/j.jsv.2024.118719","url":null,"abstract":"<div><p>In view of the poor solution accuracy of the traditional Green's function-based load reconstruction method, this paper proposes a load reconstruction method based on an iterative solution strategy. Using Green's function matrix as the gradient information of the load and dynamic response, the load history is continuously updated to minimize the residual difference between the measured response and the reference model response to obtain a reconstruction result closer to the real load history. In addition, this paper derives a Green's function matrix based on the acceleration response time series, which extends the application scope of the traditional Green's function-based load reconstruction method. Furthermore, considering the influence of uncertainty factors such as measurement noise and model error on the reconstruction results, this paper proposes a probabilistic regularized load reconstruction method based on an iterative strategy by using probability theory to describe the uncertainty. The influence of uncertainty factors is considered both in the selection of regularization parameters and in the load reconstruction process. The effectiveness of the proposed method is verified by an example of a 35-rod truss, and the effects of model error and measurement noise on the reconstruction results are discussed. Compared with the traditional method, the proposed method can achieve more accurate and robust load reconstruction results, and the effect of uncertainty on the load reconstruction results can be quantified in the framework of probability theory.</p></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142238485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0