Pub Date : 2025-01-08DOI: 10.1016/j.jsv.2025.118947
Jean P. Carneiro Jr. , Michael J. Brennan , Paulo J.P. Gonçalves , Vladislav S. Sorokin , Vinicius G. Cleante , Brian R. Mace
This paper is concerned with the control of vibration transmission along a thin beam using a vibration neutraliser. The analysis focuses on the case where the position of the neutraliser is constrained such that it cannot be at the source or the receiver, and the frequency is sufficiently high so that the evanescent waves are localised near the discontinuities, such as the neutraliser, the excitation point and each end of the beam. The neutraliser, which may be of the translational or rotational type, creates a dip in the displacement transmissibility, which corresponds to an anti-resonance in the transfer receptance between the force source at one end of the beam and the displacement at the other end. It is shown that the frequency at which the dip occurs is not equal to the natural frequency of the neutraliser, which is often the case in many practical situations. It is shown that the frequency at which the dip occurs is dependent only on the local interaction between the neutraliser and the beam, so that the boundary effects of the beam may be neglected. This is demonstrated both analytically and experimentally.
{"title":"Controlling vibration propagation in a thin beam using a neutraliser","authors":"Jean P. Carneiro Jr. , Michael J. Brennan , Paulo J.P. Gonçalves , Vladislav S. Sorokin , Vinicius G. Cleante , Brian R. Mace","doi":"10.1016/j.jsv.2025.118947","DOIUrl":"10.1016/j.jsv.2025.118947","url":null,"abstract":"<div><div>This paper is concerned with the control of vibration transmission along a thin beam using a vibration neutraliser. The analysis focuses on the case where the position of the neutraliser is constrained such that it cannot be at the source or the receiver, and the frequency is sufficiently high so that the evanescent waves are localised near the discontinuities, such as the neutraliser, the excitation point and each end of the beam. The neutraliser, which may be of the translational or rotational type, creates a dip in the displacement transmissibility, which corresponds to an anti-resonance in the transfer receptance between the force source at one end of the beam and the displacement at the other end. It is shown that the frequency at which the dip occurs is not equal to the natural frequency of the neutraliser, which is often the case in many practical situations. It is shown that the frequency at which the dip occurs is dependent only on the local interaction between the neutraliser and the beam, so that the boundary effects of the beam may be neglected. This is demonstrated both analytically and experimentally.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"602 ","pages":"Article 118947"},"PeriodicalIF":4.3,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143157841","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}
Pub Date : 2025-01-07DOI: 10.1016/j.jsv.2025.118944
Xin Su , Ziguang Jia , Lei Zhou , Qi Zhang , Huang Yi
This study focuses on dynamic-load identification in structural-health monitoring, which is crucial for the safety and longevity of ocean structures. It introduces an innovative data-processing method that applies sliding-window techniques to transform time-series data into Gramian angular field (GAF) images and a two-dimensional series. This novel approach exploits the image-feature sensitivity of deep-learning networks and fuses three-dimensional images with two-dimensional time series to enhance the input-feature representation. Furthermore, the study tailors the loss function of the algorithm using the stiffness, mass, and damping matrices of specific structures, effectively combining mathematical and physical models to improve the structural load-identification accuracy. The proposed Physical Information-based Gramian angular field (PI-GAF) method is validated through numerical simulations and practical experiments, and the results demonstrate its superiority and generalizability in the field of ocean engineering, marking a significant advancement in the domain of structural-health monitoring.
{"title":"Enhanced structural-load forecasting: Fusion of image analysis and time series with physics-driven deep-learning models","authors":"Xin Su , Ziguang Jia , Lei Zhou , Qi Zhang , Huang Yi","doi":"10.1016/j.jsv.2025.118944","DOIUrl":"10.1016/j.jsv.2025.118944","url":null,"abstract":"<div><div>This study focuses on dynamic-load identification in structural-health monitoring, which is crucial for the safety and longevity of ocean structures. It introduces an innovative data-processing method that applies sliding-window techniques to transform time-series data into Gramian angular field (GAF) images and a two-dimensional series. This novel approach exploits the image-feature sensitivity of deep-learning networks and fuses three-dimensional images with two-dimensional time series to enhance the input-feature representation. Furthermore, the study tailors the loss function of the algorithm using the stiffness, mass, and damping matrices of specific structures, effectively combining mathematical and physical models to improve the structural load-identification accuracy. The proposed Physical Information-based Gramian angular field (PI-GAF) method is validated through numerical simulations and practical experiments, and the results demonstrate its superiority and generalizability in the field of ocean engineering, marking a significant advancement in the domain of structural-health monitoring.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"601 ","pages":"Article 118944"},"PeriodicalIF":4.3,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143177710","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}
Designing a sonic crystal acoustic barrier requires understanding the crystal's acoustic attenuation, which can be predicted using its complex band structure. This paper presents an efficient Boundary DOF Replacement Bloch Mode Synthesis (BDR-BMS) method, which focuses on the challenge of unfitted boundary meshes within the framework of the finite element method to calculate the complex band structure. The method introduces pairwise fitted boundary DOFs and establishes a linear relationship between unfitted and fitted boundary DOFs, which can also facilitate reduction of boundary DOFs. Combined with the BMS method, the BDR-BMS method achieves higher numerical efficiency compared to the conventional extended BMS method. Utilizing the computed complex band structure, a wave profile decomposition (WPD) method is presented to quantitatively predict wave attenuation behaviors. Results show that wave attenuation depends on the acoustic source profile, eigen wavenumbers derived from the band structure, and the decomposition of boundary profiles from different Bloch wave modes. Also, the wave attenuation behavior is due to the excitation of evanescent Bloch wave modes. With this knowledge, significant wave attenuation can be achieved in low frequency by exciting evanescent Bloch wave modes. Experiments are performed to verify our analyses.
{"title":"Predicting wave attenuation in sonic crystals using complex band structures calculated by boundary DOF replacement Bloch Mode Synthesis (BDR-BMS) for Unfitted Boundary Meshes","authors":"Yapeng Li, Yonghang Sun, Yung Boon Chong, Kian Meng Lim, Heow Pueh Lee","doi":"10.1016/j.jsv.2025.118928","DOIUrl":"10.1016/j.jsv.2025.118928","url":null,"abstract":"<div><div>Designing a sonic crystal acoustic barrier requires understanding the crystal's acoustic attenuation, which can be predicted using its complex band structure. This paper presents an efficient Boundary DOF Replacement Bloch Mode Synthesis (BDR-BMS) method, which focuses on the challenge of unfitted boundary meshes within the framework of the finite element method to calculate the complex band structure. The method introduces pairwise fitted boundary DOFs and establishes a linear relationship between unfitted and fitted boundary DOFs, which can also facilitate reduction of boundary DOFs. Combined with the BMS method, the BDR-BMS method achieves higher numerical efficiency compared to the conventional extended BMS method. Utilizing the computed complex band structure, a wave profile decomposition (WPD) method is presented to quantitatively predict wave attenuation behaviors. Results show that wave attenuation depends on the acoustic source profile, eigen wavenumbers derived from the band structure, and the decomposition of boundary profiles from different Bloch wave modes. Also, the wave attenuation behavior is due to the excitation of evanescent Bloch wave modes. With this knowledge, significant wave attenuation can be achieved in low frequency by exciting evanescent Bloch wave modes. Experiments are performed to verify our analyses.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"601 ","pages":"Article 118928"},"PeriodicalIF":4.3,"publicationDate":"2025-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143177708","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}
Pub Date : 2025-01-04DOI: 10.1016/j.jsv.2025.118930
Manjur Alam , Yutao Guo , Yu Bai , Shenghong Luo
Buckled beams are gaining interest as promising options for nano- or micro-electromechanical systems such as mechanical sensors, actuators, energy harvesting devices, specifically in buckling-induced smart applications. Mechanical behaviour of nanostructures is significantly influenced by long-range molecular interactions. Gradient-based higher-order continuum theories are often used to effectively predict such interactions. Owing to high surface-to-bulk ratio, stress on the material surface causes an unconventional elastic response in nanostructures. Considering the long-range interactions, surface effects, and geometric nonlinearity resulting from slenderness may provide an in-depth understanding about physical characteristics of the nanostructures. Postcritical nonlinear vibration of nano beam, however, is not explored thoroughly. This study investigates the postcritical dynamic behaviour of magneto-electro-elastic composite nano beam undergoing large-amplitude vibration. Such beam, supported on Pasternak-type substrate, is modelled using higher-order shear deformation theory together with von Kármán nonlinearity. Employing variational principles, governing equations for laminated magneto-electro-elastic beams are obtained. The resulting set of nonlinear partial differential equations are solved with the aid of two-step perturbation technique. Closed-form solution characterising the linear and nonlinear frequency of buckled nano beam is obtained. The effects of essential parameters, such as nonlocal and strain-gradient length-scale parameters, substrate stiffnesses, surface stress effects, and the electric and magnetic fields, are clarified.
{"title":"Post-critical nonlinear vibration of nonlocal strain gradient beam involving surface energy effects","authors":"Manjur Alam , Yutao Guo , Yu Bai , Shenghong Luo","doi":"10.1016/j.jsv.2025.118930","DOIUrl":"10.1016/j.jsv.2025.118930","url":null,"abstract":"<div><div>Buckled beams are gaining interest as promising options for nano- or micro-electromechanical systems such as mechanical sensors, actuators, energy harvesting devices, specifically in buckling-induced smart applications. Mechanical behaviour of nanostructures is significantly influenced by long-range molecular interactions. Gradient-based higher-order continuum theories are often used to effectively predict such interactions. Owing to high surface-to-bulk ratio, stress on the material surface causes an unconventional elastic response in nanostructures. Considering the long-range interactions, surface effects, and geometric nonlinearity resulting from slenderness may provide an in-depth understanding about physical characteristics of the nanostructures. Postcritical nonlinear vibration of nano beam, however, is not explored thoroughly. This study investigates the postcritical dynamic behaviour of magneto-electro-elastic composite nano beam undergoing large-amplitude vibration. Such beam, supported on Pasternak-type substrate, is modelled using higher-order shear deformation theory together with von Kármán nonlinearity. Employing variational principles, governing equations for laminated magneto-electro-elastic beams are obtained. The resulting set of nonlinear partial differential equations are solved with the aid of two-step perturbation technique. Closed-form solution characterising the linear and nonlinear frequency of buckled nano beam is obtained. The effects of essential parameters, such as nonlocal and strain-gradient length-scale parameters, substrate stiffnesses, surface stress effects, and the electric and magnetic fields, are clarified.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"601 ","pages":"Article 118930"},"PeriodicalIF":4.3,"publicationDate":"2025-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143175521","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}
Pub Date : 2025-01-04DOI: 10.1016/j.jsv.2025.118929
Chen Yang , Xinhuan Xu , Xiaohan Wang , Ziyao Fan
Structural modal parameter identification is the initial step in modeling, monitoring and controlling dynamic systems, which can determine the accuracy of dynamics and control research. However, the uncertainty of dynamic systems is difficult to quantify, which will lead to deviations in structural modal parameter identification. Aiming to identify modal parameters under the influence of structural uncertainty parameters, this study proposed a novel interval-oriented eigensystem realization algorithm (ERA) and its modification with bounded uncertainties, which is particularly suitable for the case where structural uncertainty samples are scarce. The uncertain structures are quantified as interval uncertain parameters, which can reduce the need for quantification of uncertainty parameters without loss of accuracy. The first and second-order interval-oriented singular value decomposition (SVD) is developed, which is regarded as an important tool to solve the interval Hankel matrix. The conventional modal parameter identification method of ERA and ERA/DC are extended into the interval framework using first and second-order interval perturbation with a detailed derivation process, and the identified bounds of frequency and damping ratio can be accurately estimated using both interval-oriented ERA and ERA/DC in conjunction with first and second-order interval perturbation SVD. Finally, two numerical examples and one experimental verification are used to assess the proposed method.
{"title":"Interval-oriented eigensystem realization algorithm and its modification for structural modal parameter identification with bounded uncertainties","authors":"Chen Yang , Xinhuan Xu , Xiaohan Wang , Ziyao Fan","doi":"10.1016/j.jsv.2025.118929","DOIUrl":"10.1016/j.jsv.2025.118929","url":null,"abstract":"<div><div>Structural modal parameter identification is the initial step in modeling, monitoring and controlling dynamic systems, which can determine the accuracy of dynamics and control research. However, the uncertainty of dynamic systems is difficult to quantify, which will lead to deviations in structural modal parameter identification. Aiming to identify modal parameters under the influence of structural uncertainty parameters, this study proposed a novel interval-oriented eigensystem realization algorithm (ERA) and its modification with bounded uncertainties, which is particularly suitable for the case where structural uncertainty samples are scarce. The uncertain structures are quantified as interval uncertain parameters, which can reduce the need for quantification of uncertainty parameters without loss of accuracy. The first and second-order interval-oriented singular value decomposition (SVD) is developed, which is regarded as an important tool to solve the interval Hankel matrix. The conventional modal parameter identification method of ERA and ERA/DC are extended into the interval framework using first and second-order interval perturbation with a detailed derivation process, and the identified bounds of frequency and damping ratio can be accurately estimated using both interval-oriented ERA and ERA/DC in conjunction with first and second-order interval perturbation SVD. Finally, two numerical examples and one experimental verification are used to assess the proposed method.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"601 ","pages":"Article 118929"},"PeriodicalIF":4.3,"publicationDate":"2025-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143177711","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}
Pub Date : 2025-01-03DOI: 10.1016/j.jsv.2025.118927
Feng Wang, Yang Yang, Jin Zeng, Yiren Yang
In this paper, the geometrically exact beam theory (GEBT) and blade element momentum theory (BEMT) are used to establish the aeroelastic coupling model for analyzing the dynamics of flexible icing wind turbine blades. The developed model is verified by several examples. Besides, three nonuniform wind inflow modes are introduced in this paper. Then, the effects of icing mass and icing aerodynamics are studied respectively, and the simulation results show that the mass and aerodynamic effects of icing have different influences on blades. Next, the electromechanical characteristics of icing blades under three nonuniform wind inflow modes are calculated and analyzed respectively, and the dynamic responses under different pitch angles are compared. Furthermore, to obtain the dynamic characteristics of icing blades as closely as possible to the actual operation conditions, the case of icing blades under above factors simultaneously is simulated and analyzed. Finally, the several main conclusions of icing blades are summarized.
{"title":"Research on dynamics of icing wind turbine blade based on geometrically exact beam theory","authors":"Feng Wang, Yang Yang, Jin Zeng, Yiren Yang","doi":"10.1016/j.jsv.2025.118927","DOIUrl":"10.1016/j.jsv.2025.118927","url":null,"abstract":"<div><div>In this paper, the geometrically exact beam theory (GEBT) and blade element momentum theory (BEMT) are used to establish the aeroelastic coupling model for analyzing the dynamics of flexible icing wind turbine blades. The developed model is verified by several examples. Besides, three nonuniform wind inflow modes are introduced in this paper. Then, the effects of icing mass and icing aerodynamics are studied respectively, and the simulation results show that the mass and aerodynamic effects of icing have different influences on blades. Next, the electromechanical characteristics of icing blades under three nonuniform wind inflow modes are calculated and analyzed respectively, and the dynamic responses under different pitch angles are compared. Furthermore, to obtain the dynamic characteristics of icing blades as closely as possible to the actual operation conditions, the case of icing blades under above factors simultaneously is simulated and analyzed. Finally, the several main conclusions of icing blades are summarized.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"601 ","pages":"Article 118927"},"PeriodicalIF":4.3,"publicationDate":"2025-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143175471","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}
A novel response domain analysis method based on the multidimensional parallelepiped (MP) model is proposed to effectively evaluate the response domains of uncertain structures with multi-responses. The response domain is used to characterize the uncertainty and correlation of responses. Firstly, the rhombus MP model is introduced to describe the uncertainty and correlation of input parameters. Then, to address the large uncertainty of input parameters, an enhanced sub-parallelepiped perturbation analysis method is proposed to calculate the marginal intervals of responses. Next, the first-order perturbation correlation analysis method is developed to calculate the correlation coefficients of responses. The response domains are not limited to being described by the same type of MP model as used in the parameter domain. Instead, the estimated shape matrix analysis method is proposed to determine the best shape matrices of the MP models describing response domains. According to the marginal intervals, correlation coefficients and the best shape matrices of responses, the most reasonable types of MP models are constructed to represent response domains. Finally, several numerical examples are used to verify the effectiveness of the proposed method.
{"title":"An effective response domain analysis method for the uncertain structures with multi-responses based on multidimensional parallelepiped model","authors":"Hui Lü , Shunjiang Zhong , Xiaoting Huang , Wen-Bin Shangguan","doi":"10.1016/j.jsv.2024.118926","DOIUrl":"10.1016/j.jsv.2024.118926","url":null,"abstract":"<div><div>A novel response domain analysis method based on the multidimensional parallelepiped (MP) model is proposed to effectively evaluate the response domains of uncertain structures with multi-responses. The response domain is used to characterize the uncertainty and correlation of responses. Firstly, the rhombus MP model is introduced to describe the uncertainty and correlation of input parameters. Then, to address the large uncertainty of input parameters, an enhanced sub-parallelepiped perturbation analysis method is proposed to calculate the marginal intervals of responses. Next, the first-order perturbation correlation analysis method is developed to calculate the correlation coefficients of responses. The response domains are not limited to being described by the same type of MP model as used in the parameter domain. Instead, the estimated shape matrix analysis method is proposed to determine the best shape matrices of the MP models describing response domains. According to the marginal intervals, correlation coefficients and the best shape matrices of responses, the most reasonable types of MP models are constructed to represent response domains. Finally, several numerical examples are used to verify the effectiveness of the proposed method.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"601 ","pages":"Article 118926"},"PeriodicalIF":4.3,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143175519","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}
Pub Date : 2024-12-30DOI: 10.1016/j.jsv.2024.118925
A.D. Speksnijder , U. Karacadagli , H.C. Seyffert , A. Grammatikopoulos
An important trend exhibited by the offshore wind market is the increasing size of wind turbines, leading to longer and stiffer monopiles with larger diameter-to-thickness ratios. Current transport analysis is focused on loads resulting from hydrodynamic accelerations, without taking into account the loads resulting from differences in bending deflection between the vessel and cargo. This investigation examines the structural response of a monopile and sea-fastening system subjected to displacement-based loads. The load case follows from a vessel excited using a regular wave leading to bending deflections and rigid body accelerations. The intermittent contact between the saddles and monopile is modeled by representing the saddle with a unilateral spring. This requires the use of a nonlinear solution method to obtain structural responses. The harmonic nature of hydrodynamic-based loads led to the selection of the harmonic balance method (HBM) to model the cargo-sea-fastening system. A novel understanding is gained of how cargo properties, sea-fastening properties, and sea-fastening arrangements influence the structural response of the coupled cargo-sea-fastening system. Various parametric studies are performed to identify behaviors related to the total structural response. Based on this study, the conclusion can be drawn that a large number of saddles in combination with a low stiffness is desired to minimize the structural response of the cargo and sea-fastening system. Furthermore, the influence of lashing stiffness and pretension is limited with respect to the total response. Both these conclusions also hold for an increase in cargo length and diameter.
{"title":"Application of the harmonic balance method for ship-cargo interaction with intermittent contact nonlinearities","authors":"A.D. Speksnijder , U. Karacadagli , H.C. Seyffert , A. Grammatikopoulos","doi":"10.1016/j.jsv.2024.118925","DOIUrl":"10.1016/j.jsv.2024.118925","url":null,"abstract":"<div><div>An important trend exhibited by the offshore wind market is the increasing size of wind turbines, leading to longer and stiffer monopiles with larger diameter-to-thickness ratios. Current transport analysis is focused on loads resulting from hydrodynamic accelerations, without taking into account the loads resulting from differences in bending deflection between the vessel and cargo. This investigation examines the structural response of a monopile and sea-fastening system subjected to displacement-based loads. The load case follows from a vessel excited using a regular wave leading to bending deflections and rigid body accelerations. The intermittent contact between the saddles and monopile is modeled by representing the saddle with a unilateral spring. This requires the use of a nonlinear solution method to obtain structural responses. The harmonic nature of hydrodynamic-based loads led to the selection of the harmonic balance method (HBM) to model the cargo-sea-fastening system. A novel understanding is gained of how cargo properties, sea-fastening properties, and sea-fastening arrangements influence the structural response of the coupled cargo-sea-fastening system. Various parametric studies are performed to identify behaviors related to the total structural response. Based on this study, the conclusion can be drawn that a large number of saddles in combination with a low stiffness is desired to minimize the structural response of the cargo and sea-fastening system. Furthermore, the influence of lashing stiffness and pretension is limited with respect to the total response. Both these conclusions also hold for an increase in cargo length and diameter.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"601 ","pages":"Article 118925"},"PeriodicalIF":4.3,"publicationDate":"2024-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143175520","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}
Pub Date : 2024-12-27DOI: 10.1016/j.jsv.2024.118915
Feifan He, Jingtao Du, Yang Liu
In the inner shaft core and the outer shaft housing of a composite rotating shaft, the outer shaft housing will develop sector-like transverse breathing cracks due to fatigue during operation. In this study, the breathing mechanism of the transverse sectorial breathing crack is analyzed, and a new breathing function is formulated. The key parameters in this new breathing function are related to the shape of the crack, which is different from the traditional breathing function, in which the parameters were kept constants. By changing these key parameters, the new breathing function is not only applicable to the sectorial cracks but also to the transverse breathing cracks of various shapes. Then the dynamic equations of the crack-rotor-bearing system considering the gravity and axial loads are established using the finite element method. The effect of the crack on the system dynamic response is analyzed. There are significant nonlinear behaviors in the system dynamical response, and the super-harmonic resonances can be observed in the amplitude-frequency characteristic curves. Within the super-harmonic resonance region, the line shape of the system whirl orbits, the time history and phase diagram are closely related to the multiple of super-harmonic resonance. Determination of the axial location of rotor cracks plays a vital role in engineering applications. The frequency spectrums of system dynamic response are obtained using Fast Fourier Transformation to determine the crack location. The crack location can be also determined by analyzing the whirl orbits within the super-harmonic resonance region, as confirmed by the experimental verification.
{"title":"Influence of a new transverse sectorial breathing crack on the nonlinear dynamic characteristics of the composite rotating shaft-bearing system","authors":"Feifan He, Jingtao Du, Yang Liu","doi":"10.1016/j.jsv.2024.118915","DOIUrl":"10.1016/j.jsv.2024.118915","url":null,"abstract":"<div><div>In the inner shaft core and the outer shaft housing of a composite rotating shaft, the outer shaft housing will develop sector-like transverse breathing cracks due to fatigue during operation. In this study, the breathing mechanism of the transverse sectorial breathing crack is analyzed, and a new breathing function is formulated. The key parameters in this new breathing function are related to the shape of the crack, which is different from the traditional breathing function, in which the parameters were kept constants. By changing these key parameters, the new breathing function is not only applicable to the sectorial cracks but also to the transverse breathing cracks of various shapes. Then the dynamic equations of the crack-rotor-bearing system considering the gravity and axial loads are established using the finite element method. The effect of the crack on the system dynamic response is analyzed. There are significant nonlinear behaviors in the system dynamical response, and the super-harmonic resonances can be observed in the amplitude-frequency characteristic curves. Within the super-harmonic resonance region, the line shape of the system whirl orbits, the time history and phase diagram are closely related to the multiple of super-harmonic resonance. Determination of the axial location of rotor cracks plays a vital role in engineering applications. The frequency spectrums of system dynamic response are obtained using Fast Fourier Transformation to determine the crack location. The crack location can be also determined by analyzing the whirl orbits within the super-harmonic resonance region, as confirmed by the experimental verification.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"599 ","pages":"Article 118915"},"PeriodicalIF":4.3,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143152690","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}
Pub Date : 2024-12-26DOI: 10.1016/j.jsv.2024.118921
M. Gennaretti, B. De Rubeis, C. Poggi, G. Bernardini
{"title":"Corrigendum to ‘Deformable-boundary integral formulation for the solution of arbitrarily-forced acoustic wave equation’ [Journal of Sound and Vibration 591 (2024) 118618]","authors":"M. Gennaretti, B. De Rubeis, C. Poggi, G. Bernardini","doi":"10.1016/j.jsv.2024.118921","DOIUrl":"10.1016/j.jsv.2024.118921","url":null,"abstract":"","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"599 ","pages":"Article 118921"},"PeriodicalIF":4.3,"publicationDate":"2024-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143152698","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}
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