Journal of Sound and Vibration最新文献

{"title":"Rotor/stator interaction noise prediction in C-shaped duct with lifting surface method","authors":"Shijun Zeng ,&nbsp;Guangyu Zhang ,&nbsp;Xiaoyu Wang ,&nbsp;Feng Gao ,&nbsp;Xiaofeng Sun","doi":"10.1016/j.jsv.2025.119175","DOIUrl":"10.1016/j.jsv.2025.119175","url":null,"abstract":"<div><div>To comply with the rigorous constraints imposed on nacelle length in Ultra-High Bypass Ratio (UHBR) engines, bifurcations that were conventionally positioned downstream of the fan stage are integrated into the outlet guide vanes (OGVs). Consequently, the rearward fan noise is strongly affected by the bifurcations, as the azimuthal uniformity of OGV is disrupted and the aft-fan duct is partitioned into two C-shaped ducts. This impact is investigated using lifting surface method, assuming that the duct is infinitely long with a constant C-shaped cross-section, and the flow is uniform neglecting the distortion caused by bifurcations. Through the incorporation of a tailored Green’s function, the bifurcations are modeled as sound reflection boundaries. Subsequently, the unsteady loading on the vanes and the rearward sound power are calculated and compared against those in the annular duct. Analysis reveals that multiple azimuthal modes are scattered, resulting in a hump-shaped mode distribution. The radial mode distribution is found to be intimately related to the radial obliquity of rotor wake. The unsteady loading on different vanes shows diverse yet similar distribution after reducing the difference in the inter-blade phase angle (IBPA). These findings should contribute to the noise prediction and acoustic design of UHBR fan featured by integrated OGV and C-shaped aft-fan duct.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"615 ","pages":"Article 119175"},"PeriodicalIF":4.3,"publicationDate":"2025-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144106392","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}

{"title":"Active noise control in encapsulated structures with non-minimum phase characteristics using a Kalman filter approach","authors":"Alkahf Aboutiman ,&nbsp;Reza Shams ,&nbsp;Hamid Reza Karimi ,&nbsp;Francesco Ripamonti ,&nbsp;Marek Pawełczyk","doi":"10.1016/j.jsv.2025.119187","DOIUrl":"10.1016/j.jsv.2025.119187","url":null,"abstract":"<div><div>This paper studies the problem of active broadband noise control for an encapsulated structure. The structure is analyzed using the finite element method (FEM) to capture the interactions within the multi-physical domains of vibro-acoustic systems, allowing a detailed investigation of the propagation of sound waves and their interaction with the structural components. The frequency response function (FRF) of each control path, such as primary path and secondary path, is identified to quantify the dynamic behavior of the system across different frequencies. A complex identification method is used to calculate the state-space representations of each path for implementing an effective active noise control (ANC) algorithm. It is shown that the system under investigation exhibits non-minimum phase characteristics, a challenging aspect in ANC due to phase delays and inverted dynamics that complicate achieving precise noise cancellation. Traditional ANC algorithms, such as the Filtered-x Normalized Least Mean Squares (FxNLMS), struggle in dealing with non-minimum phase (NMP) characteristics, resulting in limited noise reduction with significant delays and undershoot effects. To overcome these limitations, this paper proposes the application of a Kalman filter approach in the ANC system, which offers enhanced efficiency and robustness in controlling the system under consideration. In comparison, the performance of the Kalman filter approach for noise reduction in the frequency band from 0 to 450 Hz can be quantified as 16.92 dB, compared to 2.72 dB for the FxNLMS approach.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"615 ","pages":"Article 119187"},"PeriodicalIF":4.3,"publicationDate":"2025-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144099337","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}

{"title":"Source enumeration in reduced-rank reference techniques for source extraction","authors":"Muhammad N. Albezzawy,&nbsp;Jérôme Antoni,&nbsp;Quentin Leclère","doi":"10.1016/j.jsv.2025.119167","DOIUrl":"10.1016/j.jsv.2025.119167","url":null,"abstract":"<div><div>In source extraction, source enumeration is essential when the true number of sources is unknown. This is the case in reduced-rank reference (coherence) techniques, where a number of references higher than the number of sources is used. The estimation of the number of sources is critical for accurate source extraction. However, this ill-posed inverse problem has not been sufficiently addressed in the literature within the framework of reference techniques. In this paper, after providing a unified formalism for all reference techniques in the literature, three alternative source enumeration methods applicable to all reference techniques are presented: a direct likelihood ratio test (LRT) against the saturated model, a parametric bootstrap technique, and a cross-validation approach. A comparative study is conducted among the three methods based on simulated numerical data, real sound experimental data, and real industrial data from an electric motor. The results reveal two important findings. First, the number of snapshots (spectral windows) used in spectral analysis significantly affects the performance of the three methods, and they behave differently for the same number of snapshots. Second, parametric bootstrapping proves to be the best method in terms of both estimation accuracy and robustness concerning the number of snapshots used.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"615 ","pages":"Article 119167"},"PeriodicalIF":4.3,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144116702","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}

{"title":"Stochastic dynamics analysis of nonlinear systems with time delay based on path integration method","authors":"Yuanyuan Bai ,&nbsp;Liang Wang ,&nbsp;Wei Xu ,&nbsp;Zhonghua Zhang ,&nbsp;Dongxi Li","doi":"10.1016/j.jsv.2025.119169","DOIUrl":"10.1016/j.jsv.2025.119169","url":null,"abstract":"<div><div>In this paper, an approach based on path integration method is proposed to study the stochastic nonlinear systems with time delay. The delay terms are processed according to the idea of multi-scale representation, so that the response of obtained approximate system is Markovian process. Then the probability density function of the equivalent system is solved by the path integration method, including both transient and steady-state aspects. The method is applied to a system with nonlinear delay term and a coupled two-degree-of-freedom system with multiple delay terms, respectively. The technique of stretching and deformation is used to deal with the dilemma of heavy computational cost caused by transition probability density function when solving high-dimensional system. Meanwhile, the huge matrix is stored sparsely to reduce the running memory usage. Finally, the influence mechanism of different time delay and parameters on the system response is discussed, and the stochastic P-bifurcation phenomenon of the probability density function is observed. The results are compared with Monte Carlo simulation results to verify the effectiveness of the proposed method.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"615 ","pages":"Article 119169"},"PeriodicalIF":4.3,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144083612","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}

{"title":"Acoustic resonance excitation and source mapping in co-axial piping systems with different junction edge geometries","authors":"Atef Mohany ,&nbsp;Omar Hammad ,&nbsp;Hossam Kishawy ,&nbsp;Marwan Hassan ,&nbsp;Mahmoud Shaaban","doi":"10.1016/j.jsv.2025.119163","DOIUrl":"10.1016/j.jsv.2025.119163","url":null,"abstract":"<div><div>In this study, the excitation of acoustic resonance in a coaxial piping system consisting of two opposite pipe branches is experimentally investigated. A lumped element model is used to determine the complex acoustic source, enabling the prediction of resonance excitation under specific flow conditions. The model is validated by assessing the susceptibility of two opposite side branches to acoustic resonance excitation. The predicted acoustic resonance parameters show good agreement with experimental observations in terms of the Strouhal numbers and normalized acoustic pressure amplitudes across a range of flow velocities. Additionally, the effects of rounding and chamfering the edges of the branching junction on resonance excitation are explored. Results indicate that rounded edges produce higher acoustic pressure amplitudes compared to chamfered and sharp edges, with a significant increase in Strouhal numbers at resonance. Furthermore, increasing the rounding radius raises both the onset flow velocity and the lock-in region. The influence of flow development and acoustic radiation losses on the excitation mechanism is also investigated. Findings show that side branches with fully developed flow and reduced acoustic radiation losses to the main pipe are more prone to acoustic resonance excitation and resonate at higher Strouhal numbers. However, the predicted acoustic amplitude reaches a maximum once the upstream distance allows for full flow development over the branching junction.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"615 ","pages":"Article 119163"},"PeriodicalIF":4.3,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144116703","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}

{"title":"Gain margin constrained H2 and H∞ optimal Positive Position Feedback control for piezoelectric vibration suppression","authors":"Bram Seinhorst,&nbsp;Marijn Nijenhuis,&nbsp;Wouter Hakvoort","doi":"10.1016/j.jsv.2025.119165","DOIUrl":"10.1016/j.jsv.2025.119165","url":null,"abstract":"<div><div>Positive Position Feedback (PPF) is a simple resonant control technique widely used to suppress vibrations. Several different tuning methods exist for this type of controller. However, the previously developed tuning methods often rely on simplifications and assume that the system can be reduced to a single mass spring system that exhibits roll-off after the resonance that is to be suppressed. This assumption is not generally valid as the response may also be influenced by a higher frequency resonance, or may not exhibit roll-off at all. This happens for example in systems with collocated piezoelectric sensing and actuation. Furthermore, robustness against gain variations and limited available actuation power are difficult to take into account with the available tuning methods. This paper presents the analytical solution to the <span><math><msub><mrow><mi>H</mi></mrow><mrow><mn>2</mn></mrow></msub></math></span> optimal tuning problem and a reliable numerical solution to the <span><math><msub><mrow><mi>H</mi></mrow><mrow><mi>∞</mi></mrow></msub></math></span> optimal tuning problem of PPF controllers for a general class of systems. The system model consists of a second order transfer with direct feed-through terms that are able to capture the response close to an undamped resonance accurately, even if it is influenced by higher frequency modes or if the system does not exhibit roll-off. The method leaves the open loop gain as a free tuning parameter, which can be set to adhere to a gain margin constraint or limit the utilised actuation power. Furthermore, experimental results are included to demonstrate the effectiveness, robustness and flexibility of the proposed optimal tuning approach.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"615 ","pages":"Article 119165"},"PeriodicalIF":4.3,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144083611","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}

{"title":"Vibration characteristic analysis of a two-stage spur gear transmission system with tooth crack and profile shifted","authors":"Zhuangzhuang Hao ,&nbsp;Donghua Wang ,&nbsp;Qingchun Zhang ,&nbsp;Shidong Wang ,&nbsp;Yue Wu ,&nbsp;Xiujiang Shi ,&nbsp;Wanyou Li","doi":"10.1016/j.jsv.2025.119211","DOIUrl":"10.1016/j.jsv.2025.119211","url":null,"abstract":"<div><div>Gear transmission systems in engineering often involve multiple stages, making vibration and fault analysis critical. This study introduces a revised spur gear time-varying mesh stiffness(TVMS) model using the potential energy method, incorporating nonlinear Hertzian contact stiffness and the coupling effects of healthy and cracked gear fillet-foundation stiffness, along with profile shift coefficients. The analysis shows that cracked gears introduce rotational frequency components into the mesh stiffness spectrum, while the profile shift coefficient influences the amplitude of mesh frequencies and their harmonics. A finite element model of a two-stage spur gear system, incorporating tooth cracks and profile shift coefficients, is developed to analyze the vibration response characteristics of healthy systems, systems with varying profile shift coefficients, and systems with different crack depths. The results indicate that in the frequency domain, a healthy two-stage spur gear transmission system exhibits not only the mesh frequencies and their harmonics but also a rich combination of these frequencies. The fault frequency for cracked gear systems corresponds to the rotational frequency of the cracked shaft and its modulation with two-stage mesh frequencies. Frequency sweeping analysis shows that varying installation positions change natural frequencies and their corresponding amplitude-frequency response, providing strategies to avoid resonance with operational speeds. In amplitude-frequency characteristics, crack depth notably impacts the amplitude at non-resonant peaks, whereas the profile shift coefficient affects the amplitude at resonant peaks. The time-domain statistical indicators(RMS, kurtosis, and IE) do not consistently respond to variations in crack depth across the entire frequency range under consideration; among these indicators, the kurtosis of the displacement signal emerges as the optimal indicator for detecting gear cracks. These findings offer valuable insights for the design and fault diagnosis of two-stage spur gear transmission systems.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"615 ","pages":"Article 119211"},"PeriodicalIF":4.3,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144106390","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}

{"title":"Numerical-analytical hybrid calculation method for acoustic radiation of underwater vehicles with internal vibration isolation system","authors":"Ming-Song Zou ,&nbsp;Huai-Cheng Tang ,&nbsp;Yi-Ni Yang ,&nbsp;Si-Long Peng ,&nbsp;Zhi-Yong Yin","doi":"10.1016/j.jsv.2025.119213","DOIUrl":"10.1016/j.jsv.2025.119213","url":null,"abstract":"<div><div>The application of floating raft isolation technology can effectively reduce mechanical noise in ships and underwater vehicles. Mastering accurate design calculation methods is key to further improving the vibration reduction and noise reduction performance of floating raft systems. More efficient modeling and solving techniques, broader frequency range applicability, and more accurate simulation of isolation components are the current focal points in the research and practical application of design calculation methods for floating raft systems. This paper proposes a hybrid multi-layer substructure integration method, combining analytical and numerical techniques, to improve the computational efficiency of vibration and acoustic radiation analysis in underwater vehicles with vibration isolation systems. The underwater vehicle is divided into a main hull (stiffened cylindrical shell) and internal multi-layer substructures (base, isolators, floating raft, etc.). The main hull is solved analytically, while the base and floating raft are modeled using modal synthesis super-element method to obtain dynamic stiffness matrices. The isolator is modeled using the four-terminal parameter method. These substructures are then integrated to compute the overall structure's vibration and acoustic radiation. For scenarios where the internal vibration isolation system is modified, only the local substructure needs to be recalculated and coupled with the rest of the structure, improving efficiency while maintaining accuracy. This method addresses the frequency limitation bottlenecks of pure numerical methods, extending the frequency range to several kilohertz and enabling significant breakthroughs in broadband applicability. The dynamic stiffness matrices of floating raft isolators, which can be obtained from experimental tests, enhance the method's practical engineering value. The validity of the proposed method is verified through numerical examples and experimental comparisons, and some underlying patterns are discussed during the evaluation process.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"615 ","pages":"Article 119213"},"PeriodicalIF":4.3,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144131023","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}

{"title":"Bayesian emulation for forecasting modal frequencies under multivariate environmental variability with data association metric and incremental updating","authors":"Le-Le Zhang ,&nbsp;Wang-Ji Yan ,&nbsp;Ka-Veng Yuen ,&nbsp;Costas Papadimitriou ,&nbsp;Wei-Xin Ren","doi":"10.1016/j.jsv.2025.119206","DOIUrl":"10.1016/j.jsv.2025.119206","url":null,"abstract":"<div><div>Accommodating the influence of Environmental and Operational Variability (EOV) on modal parameters has been a critical issue in Structural Health Monitoring (SHM). In this study, a Bayesian predictive model incorporating data association metric and incremental updating scheme is proposed to forecast the variability of modal frequencies under EOV. Fast Bayesian Operational Modal Analysis (FBOMA) is firstly employed to identify the modal properties. Based on the training data set of identified modal frequencies and multivariate Environmental and Operational Parameters (EOPs), Maximal Information Coefficient (MIC) as an efficient data association metric capable of capturing a wide range of associations is employed to measure their dependence, thereby screening out the factors with the largest correlation. Subsequently, Bayesian emulator providing a nonlinear surrogate mapping between the probability spaces of the modal frequencies and multivariate EOPs is established as a predictive model to forecast the Most Probable Values (MPVs) and associated uncertainties of modal frequencies due to arbitrary EOV. The approach constantly adapts the new field measurements to incrementally update the predictive model and improve the prediction accuracy. The case study using long-term monitoring of the Z24-Bridge demonstrates the superior prediction accuracy of the proposed scheme. Also, the proposed probabilistic input-output modelling scheme has the potential of distinguishing the variations of frequencies due to damage and EOV. This work provides a new possibility for simultaneously accommodating coupling effect of multivariate factors, nonlinear relationship, and multiple uncertainties.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"614 ","pages":"Article 119206"},"PeriodicalIF":4.3,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144178665","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}

{"title":"Identification of operational modal parameters using multi-reference weighted Hermitian transmissibility functions","authors":"Reza Tarinejad,&nbsp;Farhad Amanzad","doi":"10.1016/j.jsv.2025.119212","DOIUrl":"10.1016/j.jsv.2025.119212","url":null,"abstract":"<div><div>In recent years, methods have been developed to examine the dynamic behavior of structures without affecting their performance. Among these methods, modal parameter identification based solely on output data is a cost-effective approach. Since structures are influenced by multiple input sources simultaneously, the use of poly-reference methods is essential for identifying the structural poles with minimal uncertainty. The main drawback of poly-reference methods is their dependence on loading conditions, which must differ significantly to accurately identify the structural poles. Another limitation of these methods is the presence of non-periodic harmonic components in the frequency responses of structures, which cause dispersion around the structural poles and lead to the identification of spurious poles. To address these issues, a new approach called Poly Reference Weighted Hermitian Transmissibility Operational Modal Analysis (P-WHTOMA) is employed. In this study, a 4-DOF measured structure is analyzed under three earthquake records with varying noise levels using this novel approach. This method utilizes the weight effects on the structural responses to reduce the frequency domain of the responses and minimize spectral dispersion around the structural poles. Therefore, modal parameters are identified with minimal uncertainty under similar loading conditions and correlated input sources. Furthermore, by defining transmissibility functions using Hermitian polynomials, orthogonality is established between the normal vectors of the transmissibility functions, resulting in the identification of modal parameters at the structural poles with reduced uncertainty. In this new approach, increasing noise has less impact on the identification of structural poles. Another advantage of this method is that, unlike single-reference methods, higher structural modes are identified with greater resolution.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"615 ","pages":"Article 119212"},"PeriodicalIF":4.3,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144099184","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}