Journal of Sound and Vibration最新文献

英文中文

A parametrized virtual point reduced estimation framework for determining an unknown force’s magnitude, direction and position of action

IF 4.3 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2025-04-21 DOI: 10.1016/j.jsv.2025.119113

Julian Staiger , Rafael S.O. Dias , Simon Vanpaemel , Frank Naets

This article challenges the question of whether a force applied to a rigid interface can be estimated jointly with its position and direction of action utilizing a model which does not take such a force explicitly into account. Firstly, we discuss linear model-based estimation as a possibility to determine the amplitude, direction and position of a given unknown force acting on a rigid interface. For this purpose, the estimation results of two linear augmented Kalman filters are considered. One configuration delivers estimates for a set of equivalent forces applied to a rigid interface, which are subsequently reduced to a virtual point. The other configuration considers inputs reduced into the virtual point of interest, estimating directly the forces and moments acting on it. After the estimation process, a nonlinear system of equations is solved to characterize an arbitrary unknown acting force in amplitude, position, and direction. Thereafter, this article proposes two novel approaches based on a nonlinear augmented state–space model defined by using the Virtual Point Transformation (VPT) method that incorporates the explicit position or the lever arms of the unknown applied force as well as its direction of action with respect to the considered virtual point as parameters to be estimated. An observability analysis for these nonlinear systems is provided utilizing recent results to determine the observability of nonlinear systems with direct feedthrough and based on Lie derivatives. It was found that only the latter formulation is fully observable and hence an Augmented Extended Kalman Filter (AEKF) parametrized via the lever arms between the unknown force and the considered virtual point is chosen. The proposed methodology is then experimentally validated on an automotive-grade rubber mount component. The results show a superior performance of the nonlinear estimation framework in the time- and frequency-domain over the linear counterparts. Moreover, the unknown position and direction at which the force is applied can be estimated with higher precision and without further processing using the AEKF framework.

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引用次数: 0

Reconfigurable acoustic focusing based on origami-inspired metalens

IF 4.3 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2025-04-19 DOI: 10.1016/j.jsv.2025.119096

Chen Liu , Nengyin Wang , Tuo Liu , Zhongming Gu , Yong Li , Jie Zhu

In the realm of acoustics, the ability to focus sound using metalenses holds significant promise for various applications. However, contemporary research on such focusing lenses predominantly relies on static structures, lacking adaptability and reconfigurability. In this study, we introduce an innovative, origami-inspired reconfigurable gradient metalens. The novel design comprises foldable V-shaped unit cells, each boasting high transmission efficiency and spanning a full

2 π

phase shift within the target frequency range. Notably, by merely adjusting the folding angle, we can achieve phase differences of

π

between two unit cells at different frequencies, facilitating a versatile and selectable focusing effect characterized by a variable focal length. To further the concept, we demonstrate a metalens using eight distinct foldable unit cells, aiming to achieve pinpoint acoustic focusing through varying folding configurations. To validate this approach, we present evidence from both numerical simulations and experimental measurements of our origami-based reconfigurable metalens. The methodology offers a new perspective in constructing adaptable gradient metalenses and potential applications in acoustic sensors, energy collection devices and imaging systems.

{"title":"Reconfigurable acoustic focusing based on origami-inspired metalens","authors":"Chen Liu , Nengyin Wang , Tuo Liu , Zhongming Gu , Yong Li , Jie Zhu","doi":"10.1016/j.jsv.2025.119096","DOIUrl":"10.1016/j.jsv.2025.119096","url":null,"abstract":"<div><div>In the realm of acoustics, the ability to focus sound using metalenses holds significant promise for various applications. However, contemporary research on such focusing lenses predominantly relies on static structures, lacking adaptability and reconfigurability. In this study, we introduce an innovative, origami-inspired reconfigurable gradient metalens. The novel design comprises foldable V-shaped unit cells, each boasting high transmission efficiency and spanning a full <span><math><mrow><mn>2</mn><mi>π</mi></mrow></math></span> phase shift within the target frequency range. Notably, by merely adjusting the folding angle, we can achieve phase differences of <span><math><mi>π</mi></math></span> between two unit cells at different frequencies, facilitating a versatile and selectable focusing effect characterized by a variable focal length. To further the concept, we demonstrate a metalens using eight distinct foldable unit cells, aiming to achieve pinpoint acoustic focusing through varying folding configurations. To validate this approach, we present evidence from both numerical simulations and experimental measurements of our origami-based reconfigurable metalens. The methodology offers a new perspective in constructing adaptable gradient metalenses and potential applications in acoustic sensors, energy collection devices and imaging systems.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"612 ","pages":"Article 119096"},"PeriodicalIF":4.3,"publicationDate":"2025-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143870616","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

Observation of exceptional points in a spherical open elastic system

IF 4.3 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2025-04-19 DOI: 10.1016/j.jsv.2025.119114

Hiroaki Deguchi , Kei Matsushima , Takayuki Yamada

Exceptional points (EPs) are spectral singularities in non-Hermitian systems where eigenvalues and their corresponding eigenstates coalesce simultaneously. In this study, we calculate scattering poles in an open spherical solid and propose a depth-first search-based method to identify EPs. Using the proposed method, we numerically identify multiple EPs in a parameter space and confirm the simultaneous degeneracy of scattering poles through numerical experiments. The proposed method and findings enable the exploration of applications in practical three-dimensional models.

引用次数: 0

Modelling the vibrational response of structures to high-frequency turbulent boundary layer excitation

IF 4.3 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2025-04-17 DOI: 10.1016/j.jsv.2025.119097

Joshua Finn , Gregor Tanner , Martin Richter

Modelling the response of complex built-up structures under the influence of distributed and correlated high-frequency force fields is an important aspect in many structural dynamics applications. A prime example of such a forcing is the pressure field applied by a Turbulent Boundary Layer (TBL) on an aircraft in flight. Previous studies focus on the total vibrational power input into the structure and do not consider spatial variations or directional components of the energy input introduced due to correlated forcing. We will close this gap by demonstrating how correlated force fields can be implemented as the source term in a Dynamical Energy Analysis (DEA) treatment determining the resulting vibrational energy distribution in a complex structure. Using Wigner-transformation techniques, we convert force-correlation functions (such as those routinely used to describe TBL excitations) into directional ray-source terms which then provide the source for a DEA treatment. Results are presented for the vibrational energy distribution across a flat plate excited by a fully formed, stationary TBL under a variety of flow conditions. We note that even though the excitation is spatially uniform across the plate, there is a preference for energy to flow in the downstream direction. This leads to a marked enhanced of the vibrational excitation at the trailing edge of the plate.

{"title":"Modelling the vibrational response of structures to high-frequency turbulent boundary layer excitation","authors":"Joshua Finn , Gregor Tanner , Martin Richter","doi":"10.1016/j.jsv.2025.119097","DOIUrl":"10.1016/j.jsv.2025.119097","url":null,"abstract":"<div><div>Modelling the response of complex built-up structures under the influence of distributed and correlated high-frequency force fields is an important aspect in many structural dynamics applications. A prime example of such a forcing is the pressure field applied by a Turbulent Boundary Layer (TBL) on an aircraft in flight. Previous studies focus on the total vibrational power input into the structure and do not consider spatial variations or directional components of the energy input introduced due to correlated forcing. We will close this gap by demonstrating how correlated force fields can be implemented as the source term in a Dynamical Energy Analysis (DEA) treatment determining the resulting vibrational energy distribution in a complex structure. Using Wigner-transformation techniques, we convert force-correlation functions (such as those routinely used to describe TBL excitations) into directional ray-source terms which then provide the source for a DEA treatment. Results are presented for the vibrational energy distribution across a flat plate excited by a fully formed, stationary TBL under a variety of flow conditions. We note that even though the excitation is spatially uniform across the plate, there is a preference for energy to flow in the downstream direction. This leads to a marked enhanced of the vibrational excitation at the trailing edge of the plate.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"611 ","pages":"Article 119097"},"PeriodicalIF":4.3,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143870801","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

Parameter and delay-dependent sliding mode recoil control for deepwater drilling risers 深水钻井立管的参数和延迟相关滑模反冲控制

IF 4.3 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2025-04-17 DOI: 10.1016/j.jsv.2025.119098

Bao-Lin Zhang , Shou-Xiang Yan , Qing-Long Han , Xian-Ming Zhang , Yanlong Cao , Yun Zhang

This study deals with a parameter and delay-dependent sliding mode control strategy to mitigate recoil responses of drilling risers. First, by taking into consideration the nonlinear top tension of the tensioner, external heave motion of platform, friction resistance of drilling discharge, and unmodeled dynamics, a nonlinear recoil dynamic model of the drilling riser is established. Then, by introducing parameters and time-delays into control channel, a parameter and delay-dependent sliding mode recoil controller is developed to attenuate recoil movements of the riser. The existence conditions of the sliding mode recoil controller with parameters and time-delays of the riser are derived. Simulation results demonstrate that the designed sliding mode recoil controllers can reduce the recoil responses of the riser remarkably, and outperform some existing recoil controllers. Moreover, it is found that the parameter and delay-dependent sliding mode recoil control scheme can provide more options to design recoil controllers for the drilling riser.

{"title":"Parameter and delay-dependent sliding mode recoil control for deepwater drilling risers","authors":"Bao-Lin Zhang , Shou-Xiang Yan , Qing-Long Han , Xian-Ming Zhang , Yanlong Cao , Yun Zhang","doi":"10.1016/j.jsv.2025.119098","DOIUrl":"10.1016/j.jsv.2025.119098","url":null,"abstract":"<div><div>This study deals with a parameter and delay-dependent sliding mode control strategy to mitigate recoil responses of drilling risers. First, by taking into consideration the nonlinear top tension of the tensioner, external heave motion of platform, friction resistance of drilling discharge, and unmodeled dynamics, a nonlinear recoil dynamic model of the drilling riser is established. Then, by introducing parameters and time-delays into control channel, a parameter and delay-dependent sliding mode recoil controller is developed to attenuate recoil movements of the riser. The existence conditions of the sliding mode recoil controller with parameters and time-delays of the riser are derived. Simulation results demonstrate that the designed sliding mode recoil controllers can reduce the recoil responses of the riser remarkably, and outperform some existing recoil controllers. Moreover, it is found that the parameter and delay-dependent sliding mode recoil control scheme can provide more options to design recoil controllers for the drilling riser.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"610 ","pages":"Article 119098"},"PeriodicalIF":4.3,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143848033","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

Dynamics and non-integrability of the variable-length double pendulum: Exploring chaos and periodicity via the Lyapunov refined maps

IF 4.3 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2025-04-17 DOI: 10.1016/j.jsv.2025.119099

Wojciech Szumiński , Tomasz Kapitaniak

This paper extends our previous work (Szumiński and Maciejewski, 2024), where we explored the dynamics and integrability of the double-spring pendulum. Here, we investigate the variable-length double pendulum, a three-degree-of-freedom Hamiltonian system combining features of the classic double pendulum and the swinging Atwood machine. With its intricate dynamics, this system is crucial for studying nonlinear phenomena such as high-order resonances, chaos, and bifurcations. We address the challenges posed by high-dimensional phase spaces using a novel tool, the Lyapunov refined maps, which integrates Poincaré sections, phase-parametric diagrams, and Lyapunov exponents. This framework comprehensively analyzes periodic, quasi-periodic, and chaotic behaviors. By measuring the strength of chaos, it also offers insights into the system’s dynamical structure. Additionally, we apply Morales-Ramis theory to examine integrability, leveraging the differential Galois group of variational equations to establish non-integrability conditions. The Kovacic algorithm is used to analyze the solvability of higher-dimensional differential equations, complemented by Lyapunov exponent diagrams to exclude integrable dynamics under certain parameters. Our findings advance the fundamental understanding of variable-length pendulum dynamics, offering new insights and methodologies for further research with potential applications in adaptive robotics, energy harvesting, and biomechanics. Additionally, this work represents a significant step toward proving the long-sought non-integrability of the classical double pendulum.

{"title":"Dynamics and non-integrability of the variable-length double pendulum: Exploring chaos and periodicity via the Lyapunov refined maps","authors":"Wojciech Szumiński , Tomasz Kapitaniak","doi":"10.1016/j.jsv.2025.119099","DOIUrl":"10.1016/j.jsv.2025.119099","url":null,"abstract":"<div><div>This paper extends our previous work (Szumiński and Maciejewski, 2024), where we explored the dynamics and integrability of the double-spring pendulum. Here, we investigate the variable-length double pendulum, a three-degree-of-freedom Hamiltonian system combining features of the classic double pendulum and the swinging Atwood machine. With its intricate dynamics, this system is crucial for studying nonlinear phenomena such as high-order resonances, chaos, and bifurcations. We address the challenges posed by high-dimensional phase spaces using a novel tool, the <em>Lyapunov refined maps</em>, which integrates Poincaré sections, phase-parametric diagrams, and Lyapunov exponents. This framework comprehensively analyzes periodic, quasi-periodic, and chaotic behaviors. By measuring the strength of chaos, it also offers insights into the system’s dynamical structure. Additionally, we apply Morales-Ramis theory to examine integrability, leveraging the differential Galois group of variational equations to establish non-integrability conditions. The Kovacic algorithm is used to analyze the solvability of higher-dimensional differential equations, complemented by Lyapunov exponent diagrams to exclude integrable dynamics under certain parameters. Our findings advance the fundamental understanding of variable-length pendulum dynamics, offering new insights and methodologies for further research with potential applications in adaptive robotics, energy harvesting, and biomechanics. Additionally, this work represents a significant step toward proving the long-sought non-integrability of the classical double pendulum.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"611 ","pages":"Article 119099"},"PeriodicalIF":4.3,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143865025","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

An application of multi-scale vibration analysis of thin plate with a dense system of ribs in the detection of micro-scale imperfections

IF 4.3 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2025-04-15 DOI: 10.1016/j.jsv.2025.119093

Jakub Marczak, Bohdan Michalak

In this paper the analytical multi-scale vibration analysis of the periodic thin plate with a dense system of ribs is performed. It is assumed that the considered structure is burdened with certain imperfections, which can affect its dynamic behaviour. Eventually, basing on the free vibration analysis and short wave propagation issue, it is proved, that the presented averaged models are capable of detecting the small scale imperfections. It should be noticed, that such analysis is not possible with other known methods of analysis of periodic structures, such as the homogenisation method. The presented results prove both the correctness of the shown transformations and the superiority of the solution.

引用次数: 0

Marker-free full-field approach for structural 3D vibration response measurement based on Gaussian process regression and pyramidal optical flow

IF 4.3 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2025-04-15 DOI: 10.1016/j.jsv.2025.119133

Guang Li , Yiming Zhang , Zili Xu , Manqing Qin , Mengfu He , Ajun Meng

Vision-based measurement techniques are drawing attention due to their non-contact, flexible and efficient advantages. However, most existing techniques require artificial markers for stereo matching and monocular tracking. The marker-free techniques are difficult to achieve full-field stereo matching and currently only applicable to 2D vibration measurements. This paper proposes a novel marker-free full-field approach for 3D vibration response measurement. Firstly, stereo matching is considered a regression problem, and Gaussian process regression (GPR) is used to model the relationship between matching point pairs. With the dataset provided by feature point matching, marker-free stereo matching of full-field arbitrary points is efficiently achieved using trained GPR. Secondly, the pyramid optical flow is applied to marker-free visual tracking, which can simultaneously track the full-field matching point pairs in two video sequences without artificial markers. Finally, the 3D vibration responses are obtained by stereo camera calibration and 3D reconstruction. The accuracy and performance of the proposed approach are evaluated through vibration measurement tests on a thin-walled pipe. The vibration responses measured by the proposed approach are compared with those measured by the laser vibrometer, accelerometer, and digital image correlation approach. Besides, a modal analysis test on a thin plate is constructed in which the full-field response measured by the proposed approach is used as the input of the modal analysis. The results demonstrate that the proposed approach can accurately measure the 3D vibration responses. And it has excellent capability in marker-free full-field vibration measurements and great potential in modal analysis.

{"title":"Marker-free full-field approach for structural 3D vibration response measurement based on Gaussian process regression and pyramidal optical flow","authors":"Guang Li , Yiming Zhang , Zili Xu , Manqing Qin , Mengfu He , Ajun Meng","doi":"10.1016/j.jsv.2025.119133","DOIUrl":"10.1016/j.jsv.2025.119133","url":null,"abstract":"<div><div>Vision-based measurement techniques are drawing attention due to their non-contact, flexible and efficient advantages. However, most existing techniques require artificial markers for stereo matching and monocular tracking. The marker-free techniques are difficult to achieve full-field stereo matching and currently only applicable to 2D vibration measurements. This paper proposes a novel marker-free full-field approach for 3D vibration response measurement. Firstly, stereo matching is considered a regression problem, and Gaussian process regression (GPR) is used to model the relationship between matching point pairs. With the dataset provided by feature point matching, marker-free stereo matching of full-field arbitrary points is efficiently achieved using trained GPR. Secondly, the pyramid optical flow is applied to marker-free visual tracking, which can simultaneously track the full-field matching point pairs in two video sequences without artificial markers. Finally, the 3D vibration responses are obtained by stereo camera calibration and 3D reconstruction. The accuracy and performance of the proposed approach are evaluated through vibration measurement tests on a thin-walled pipe. The vibration responses measured by the proposed approach are compared with those measured by the laser vibrometer, accelerometer, and digital image correlation approach. Besides, a modal analysis test on a thin plate is constructed in which the full-field response measured by the proposed approach is used as the input of the modal analysis. The results demonstrate that the proposed approach can accurately measure the 3D vibration responses. And it has excellent capability in marker-free full-field vibration measurements and great potential in modal analysis.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"610 ","pages":"Article 119133"},"PeriodicalIF":4.3,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143865069","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

Acoustic scattering by multi-layered gratings 多层光栅的声散射

IF 4.3 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2025-04-10 DOI: 10.1016/j.jsv.2025.119083

Shiza B. Naqvi, Lorna J. Ayton

Acoustic scattering by layered array gratings and diverse boundary conditions is considered by adapting the semi-analytic Fokas method to periodic geometries. The generalised Dirichlet-to-Neumann (DtN) map is solved numerically and the scattering solution is recovered through a Green’s integral representation. The boundary conditions on the array gratings include sound-hard, sound-soft and elastic. Acoustic scattering by layered array gratings with different periods is also discussed. Engineering applications include the use of layered perforated structures as anti-reflection coatings and anti-transmission coatings. The method is also presented as a baseline upon which to build a theoretical homogenisation model for effective impedance parameters for perforated structures.

引用次数: 0

Dynamic modeling and spectrum modulation effect of multi-type bearing-supported rotor systems with combined misalignment faults

IF 4.3 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2025-04-09 DOI: 10.1016/j.jsv.2025.119118

Zhiyuan Jiang , Xianzhen Huang , Liangshi Sun , Yuping Wang , Fusheng Jiang

Multi-type bearing-supported rotor (MBR) systems leverage versatile bearing configurations to achieve broad applicability across industrial sectors. Inadequate assembly capabilities leading to pedestal-raceway misalignment will inevitably trigger operational hazards to the MBR system. In this regard, this paper develops a flexible model of the MBR system incorporating novel combined misalignment configurations. The dynamic analytical stiffness matrix for multi-type bearings has been derived based on implicit functions and the chain rule of differentiation. The bending-torsional coupling effect of the flexible MBR system is faithfully reproduced by combining the derived dynamic analytical stiffness with the Timoshenko beam theory. The frequency-capturing capabilities of the proposed model have been validated through a comprehensive comparison between theoretical, experimental, and developed models. Additionally, qualitative and quantitative comparisons are conducted between the healthy, static misalignment, dynamic misalignment, and combined misalignment modes from the perspectives of motion characteristics, time domain, and frequency domain. Vibration intensity and energy transfer analyses reveal distinct amplification and cancellation effects in combined misalignment scenarios. Systematic analysis identifies the characteristic frequencies and distinct mutual modulation effects inherent to combined misalignment. Additionally, the compensation mechanism of combined misalignment modes with multi-type bearing clearances has been revealed.

{"title":"Dynamic modeling and spectrum modulation effect of multi-type bearing-supported rotor systems with combined misalignment faults","authors":"Zhiyuan Jiang , Xianzhen Huang , Liangshi Sun , Yuping Wang , Fusheng Jiang","doi":"10.1016/j.jsv.2025.119118","DOIUrl":"10.1016/j.jsv.2025.119118","url":null,"abstract":"<div><div>Multi-type bearing-supported rotor (MBR) systems leverage versatile bearing configurations to achieve broad applicability across industrial sectors. Inadequate assembly capabilities leading to pedestal-raceway misalignment will inevitably trigger operational hazards to the MBR system. In this regard, this paper develops a flexible model of the MBR system incorporating novel combined misalignment configurations. The dynamic analytical stiffness matrix for multi-type bearings has been derived based on implicit functions and the chain rule of differentiation. The bending-torsional coupling effect of the flexible MBR system is faithfully reproduced by combining the derived dynamic analytical stiffness with the Timoshenko beam theory. The frequency-capturing capabilities of the proposed model have been validated through a comprehensive comparison between theoretical, experimental, and developed models. Additionally, qualitative and quantitative comparisons are conducted between the healthy, static misalignment, dynamic misalignment, and combined misalignment modes from the perspectives of motion characteristics, time domain, and frequency domain. Vibration intensity and energy transfer analyses reveal distinct amplification and cancellation effects in combined misalignment scenarios. Systematic analysis identifies the characteristic frequencies and distinct mutual modulation effects inherent to combined misalignment. Additionally, the compensation mechanism of combined misalignment modes with multi-type bearing clearances has been revealed.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"609 ","pages":"Article 119118"},"PeriodicalIF":4.3,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143839412","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

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Journal of Sound and Vibration

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