Journal of Sound and Vibration最新文献

{"title":"A dual-mode hybrid magnetic high-static-low-dynamic stiffness vibration isolator","authors":"Ming Zhang ,&nbsp;Hongtao Li ,&nbsp;Lei Zhang ,&nbsp;Feng Sun ,&nbsp;Xingwei Sun ,&nbsp;Koichi Oka","doi":"10.1016/j.jsv.2024.118906","DOIUrl":"10.1016/j.jsv.2024.118906","url":null,"abstract":"<div><div>A high-static-low-dynamic stiffness (HSLDS) vibration isolator with both semi-active and passive operating modes is presented. This vibration isolator is designed using three permanent magnets (PMs) and two coil windings (CWs). The HSLDS characteristics arise from the nonlinear repulsive forces between the PMs. The stiffness characteristics of the system can be rapidly adjusted by regulating the current in the CWs. When the current is set to zero, the system transitions from semi-active to passive mode. Unlike traditional vibration isolation systems that utilize linear springs to balance load forces, this proposed system relies on the repulsive forces between PMs, resulting in asymmetric stiffness characteristics. This design ensures a more compact structure while maintaining the HSLDS properties even in passive mode. This paper establishes a nonlinear axial magnetic force model and dynamic equations for the system. Based on Floquet theory, the stability of the nonlinear system is analyzed, and the stability boundaries are identified. The impact of geometric parameters on vibration isolation performance is examined, and optimal parameters are selected to construct the experimental setup. The experimental results validate the vibration isolation performance of the device. Based on the analysis of the experimental data, a semi-active control strategy that incorporates frequency calculations is proposed in this study. Finally, the effectiveness of the semi-active control strategy in enhancing vibration isolation performance is confirmed through additional experiments.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"599 ","pages":"Article 118906"},"PeriodicalIF":4.3,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143152684","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":"Two-stage Bayesian inference for rail model updating and crack detection with ultrasonic guided wave measurements and advanced wave propagation simulation","authors":"Jiang-Zheng Zhan ,&nbsp;Wang-Ji Yan ,&nbsp;Wen Wu ,&nbsp;Ka-Veng Yuen ,&nbsp;Dimitrios Chronopoulos","doi":"10.1016/j.jsv.2024.118914","DOIUrl":"10.1016/j.jsv.2024.118914","url":null,"abstract":"<div><div>Ultrasonic Guided Waves (UGWs) play a vital role in the non-destructive testing due to exceptional sensitivity to small damage. This study proposes an integrated two-stage Bayesian inference scheme, aimed at updating the physical model parameters of the rail, to improve subsequent crack identification, thus overcoming the limitations caused by insufficient crack detection due to modeling discrepancies. Within the integrated two-stage Bayesian inference framework, the physical model parameters (i.e., modulus of elasticity and damping loss factor, etc.) are updated using wavenumbers extracted from UGW measurements. Subsequently, the crack parameters are identified based on scattering coefficients predicted by the updated forward solver. An integral formula is ultimately derived analytically to incorporate the uncertainty propagation procedure from the physical model parameters into the crack parameter identification, properly accounting for the model parameter variability. Additionally, a Monte Carlo simulation is employed to approximate the integral. To address the computational challenges in the likelihood evaluations during the Bayesian inversion procedure using Transitional Markov Chain Monte Carlo (TMCMC) in both stages, a cost-effective Kriging predictor providing a surrogate mapping between the model predictions and the identified parameters is established for each stage based on the training outputs computed using an advanced wave propagation simulation scheme. The feasibility and effectiveness are verified through numerical and experimental investigations. Results indicate that the proposed Bayesian inference scheme based on UGWs in conjunction with the wave propagation simulation-aided metamodel can identify the location and size of the crack with reasonable accuracy and efficiency. The proposed scheme could result in more reliable models effectively enhancing the accuracy of crack identification.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"599 ","pages":"Article 118914"},"PeriodicalIF":4.3,"publicationDate":"2024-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143152687","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":"An asymmetric hysteresis model for metal-rubber isolators under dynamic loading and its application to nonlinear vibration simulation","authors":"Yihan Du ,&nbsp;Dong Wang ,&nbsp;Yongbu Jin ,&nbsp;Xuanhua Fan","doi":"10.1016/j.jsv.2024.118911","DOIUrl":"10.1016/j.jsv.2024.118911","url":null,"abstract":"<div><div>Metal-rubber isolators (MRIs) have been widely used to mitigate vibration in sensitive equipment due to their high damping properties. This paper aims to predict the nonlinear vibration response of an MRI system by using the hysteretic nonlinearity of a single MRI. An experimental study was conducted to investigate the effects of excitation levels on the hysteretic nonlinearities of a typical MRI. An asymmetric hysteresis model (AHM) was developed to accurately reproduce the experimental hysteresis loop by simultaneously considering the nonlinear elasticity and dry friction damping. The equivalent slip force amplitude of the MRI can be extracted from the frictional damping force to describe the slip state of the internal metal wires. Additionally, it was integrated as a constraint into parameter evolution to accurately predict the hysteretic behavior at various excitation amplitudes. The harmonic balance method (HBM) combined with alternating frequency-time (AFT) analysis was used to simulate the steady-state nonlinear vibration response of a complex MRI system. The simulation results showed good agreement with the experimental data, and indicated two major nonlinear phenomena: nonlinear softening stiffness and nonlinear damping effects. This paper developed a modeling and simulation strategy spanning from the MRI element to the system level.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"599 ","pages":"Article 118911"},"PeriodicalIF":4.3,"publicationDate":"2024-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143152685","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":"The Maximally-Coherent Reference technique and its application to sound source extraction without synchronous measurements","authors":"Muhammad N. Albezzawy,&nbsp;Jérôme Antoni,&nbsp;Quentin Leclère","doi":"10.1016/j.jsv.2024.118896","DOIUrl":"10.1016/j.jsv.2024.118896","url":null,"abstract":"<div><div>In source identification, it is often necessary to perform source extraction, and in cases involving sequential measurements, to also perform resynchronization. Coherence techniques, which are based on the use of references (i.e., fixed sensors), are widely used to solve these two equivalent problems. However, when the number of references surpasses the number of sources, the cross-spectral matrix becomes ill-conditioned, invalidating the popular least squares (LS) solution. Although the truncated singular value decomposition (TSVD) was successfully applied in the literature to solve this problem, its validity is limited to the case of scalar noise on the references. It is also difficult to apply, when the singular values are gradually decreasing. This paper proposes a solution based on a set of virtual references that is maximally correlated with the measurements, named the Maximally-Coherent Reference (MCR) technique, accompanied with a technique for estimating the number of sources. The method is validated using both numerical and physical laboratory experiments, and by using real acoustical data from an e-motor. It is shown to return better results than LS and TSVD when employed for the same purpose.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"599 ","pages":"Article 118896"},"PeriodicalIF":4.3,"publicationDate":"2024-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143152686","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}

{"title":"Optimal bearing configuration selection for power generation shaft-trains: A linear and nonlinear dynamics approach","authors":"Athanasios Chasalevris ,&nbsp;Ioannis Gavalas ,&nbsp;Jerzy T. Sawicki","doi":"10.1016/j.jsv.2024.118907","DOIUrl":"10.1016/j.jsv.2024.118907","url":null,"abstract":"<div><div>This paper proposes a straightforward procedure for defining bearing design configurations in turbine-generator shaft trains. The bearing design inputs specify the bearing type and the pad configuration. The design outputs focus on stability, bearing integrity, and operability of the shaft-train system. The design output is evaluated in two ways: a) linear harmonic analysis utilizing linearized stiffness and damping coefficients for the bearing impedance forces, and b) nonlinear analysis, where the bearing forces are modeled as nonlinear functions of bearing and pedestal kinematics; the response is evaluated by collocation-type method coupled with numerical continuation. Thermohydrodynamic lubrication (THD lubrication) with turbulence correction is considered in the bearing lubrication model.</div><div>The results show that all constraints are satisfied, and the optimal bearing configurations include preload and offset, while no specific trend is observed for specific loads. Laminar oil flow is prompted by the optimization through specific bearing diameters. Linear and nonlinear dynamic models do not render identical optimal designs. Linear model tends to be conservative in the design output, while nonlinear dynamic model provides more accurate predictions, accounting for any whirling orbit shape. The results emphasize the necessity of incorporating nonlinear dynamics into standard rotor dynamic calculations for this type of machines.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"599 ","pages":"Article 118907"},"PeriodicalIF":4.3,"publicationDate":"2024-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143152692","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":"Study on vertical-torsional chatter under asymmetric conditions in tandem cold rolling","authors":"Fangsheng Chen ,&nbsp;Xu Li ,&nbsp;Lei Cao ,&nbsp;Pengfei Wang","doi":"10.1016/j.jsv.2024.118888","DOIUrl":"10.1016/j.jsv.2024.118888","url":null,"abstract":"<div><div>The vibrations generated by the rolling mills significantly impair the production quality and efficiency of cold tandem rolling. Considering that the main drive system constitutes one of the energy sources of vibration, this study integrates the vertical structure of the rolling mill with the torsional structure of the main drive system for a comprehensive analysis. This study establishes an asymmetric dynamic rolling force model that accounts for the structural asymmetry of the rolling mill, the asymmetric power transmission between the upper and lower connecting shafts of the main drive system, and the long-term wear and friction conditions of the mechanical equipment. Furthermore, this study accounts for the speed differential between the upper and lower work rolls induced by torsional vibrations. Based on these interdependent parameters, this study develops a rolling mill vibration coupling model to comprehensively assess stability. The validation of the model confirms its high accuracy. Variations in rolling torque under different roll speed ratios, friction coefficient ratios, and roll diameter ratios were analyzed, along with the impact of the cross-shear zone's proportion on system stability under key rolling parameters. Furthermore, changes in rolling torque, amplitude, and the cross-shear zone during unstable operating conditions were examined. Finally, the interaction between the vertical and torsional structures was studied, providing a theoretical foundation for optimizing process parameters and mitigating vibrations in the continuous cold rolling process.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"599 ","pages":"Article 118888"},"PeriodicalIF":4.3,"publicationDate":"2024-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143152695","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":"Second and third harmonic generation of acoustic waves in a nonlinear elastic solid in one space dimension","authors":"Fernando Lund","doi":"10.1016/j.jsv.2024.118895","DOIUrl":"10.1016/j.jsv.2024.118895","url":null,"abstract":"<div><div>The generation of second and third harmonics by an acoustic wave propagating along one dimension in a weakly nonlinear elastic medium is analyzed by successive approximations starting with the linear case. The medium is loaded harmonically in time with frequency <span><math><msub><mrow><mi>ω</mi></mrow><mrow><mn>0</mn></mrow></msub></math></span> at a single point in space. It is important to recall two known facts: The first, nonlinear waves have a speed of propagation that depends on their amplitude, a reflection of the fact that nonlinear oscillators have an amplitude-dependent period. The second fact is that although both a free and a loaded medium generate higher harmonics, the second harmonic of the free medium scales like the square of the linear wave, but this is no longer the case when the medium is externally loaded. The shift in speed of propagation due to the nonlinearities is determined imposing that there be no resonant (“secular”) terms in a successive approximations solution scheme to the homogeneous (i.e., “free”) problem. The result is then used to solve the inhomogeneous (i.e., “loaded”) case also by successive approximations, up to the third order. At second order, the result is a second harmonic wave whose amplitude is modulated by a long wave of wavelength inversely proportional to the shift in the speed of propagation of the linear wave due to nonlinearities. The amplitude of the long modulating wave scales like the amplitude of the linear wave to the four-thirds. It depends both on the third- and fourth-order elastic constants, as well as on the frequency and amplitude of the loading. A distance scale emerges: it depends on nonlinearities, on the loading frequency and on the amplitude of the linear wave. In this distance scale, at short distances from the source a second harmonic scaling proportional to the amplitude of the linear wave squared, and to the distance from the source, is recovered. It depends on the third-order elastic constant only. The third order solution is the sum of four amplitude-modulated waves, two of them oscillate with frequency <span><math><msub><mrow><mi>ω</mi></mrow><mrow><mn>0</mn></mrow></msub></math></span> and the other two, third harmonics, with <span><math><mrow><mn>3</mn><msub><mrow><mi>ω</mi></mrow><mrow><mn>0</mn></mrow></msub></mrow></math></span>. In each pair, one term scales like the amplitude of the linear wave to the five-thirds, and the other to the seven-thirds.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"600 ","pages":"Article 118895"},"PeriodicalIF":4.3,"publicationDate":"2024-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143175951","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":"Realization of a wideband three-axis horizontal vibration isolator with adjustable stiffness and damping","authors":"Mehmet Utku Demir,&nbsp;Cetin Yilmaz","doi":"10.1016/j.jsv.2024.118876","DOIUrl":"10.1016/j.jsv.2024.118876","url":null,"abstract":"<div><div>Horizontal vibration isolators (HVIs) designed to be on the verge of elastic instability offer many opportunities for isolating a variety of vibration-sensitive instruments, such as atomic force microscopes and laser/optical systems from ambient excitations at very low frequencies (0.5 – 5 Hz). These HVI systems are designed to have very low natural frequencies and can achieve quasi-zero-stiffness (QZS) in the horizontal axes when they support payloads close to their maximum payload-carrying capacities. Payloads of different sizes and weights necessitate to have adjustable stiffness and damping to operate in very wide bandwidths. To address these issues, a QZS HVI using axially compressed elastic columns is designed, optimized and fabricated. The system has adjustable natural frequencies in three axes (two translational and one torsional) via a string tensioning mechanism. Besides, the system enables the torsional natural frequency to be adjusted independently of the two translational natural frequencies by means of novel column sliding mechanisms that can change the radial positions of the elastic columns from the center axis of the system. Amplitude-dependent damping and stiffness characteristics of this variable natural frequency system are determined under various axial preload conditions. The system also involves an adjustable eddy current damper to effectively suppress low frequency resonance peaks. Finally, a methodology is proposed to modify the ideally clamped boundary conditions of the elastic columns, resulting in very good agreement between the analytical, numerical, and experimental results. The results show that the proposed HVI can achieve bandwidths between 1.6 – 311 Hz in the translational axes and 0.7 – 311 Hz in the torsional axis for payloads between 0 – 45 kg, providing a very large isolation bandwidth in three axes for a wide range of payload masses.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"600 ","pages":"Article 118876"},"PeriodicalIF":4.3,"publicationDate":"2024-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143175943","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":"Three-dimensional interaction of thermoacoustic modes in a circular tube","authors":"Weipeng Zhou ,&nbsp;Xiaoyu Wang ,&nbsp;Guangyu Zhang ,&nbsp;Maria Heckl ,&nbsp;Xiaofeng Sun","doi":"10.1016/j.jsv.2024.118899","DOIUrl":"10.1016/j.jsv.2024.118899","url":null,"abstract":"<div><div>This study applies the Green's function method to investigate the modal interaction during thermoacoustic instability specifically in the afterburner. The afterburner is modelled as a cylindrical tube with a compact flame. Nonlinear effects are accounted for by employing the flame describing function (FDF). An integral governing equation for the acoustic velocity at the flame is derived. This is solved by an iteration method to obtain the time history of the acoustic velocity at the flame. The coupling mechanism, which is nonlinear due to the amplitude-dependence of the FDF, is explored using a two-mode analysis as an illustrative example. Different scenarios are observed when the initial amplitude is varied: the long-term behaviour of the time history may be dominated by one of the modes, which forms a limit cycle and squeezes out the other mode, i.e. there is a mutually inhibitory effect; however, it is also possible, for both modes to coexist. This dependence on the initial condition is a consequence of the amplitude-dependent heat release rate, and it is clearly a nonlinear effect. The time history calculation is supplemented by a phase analysis, which is based on the Rayleigh criterion and reveals the stability behaviour and limit cycles of the individual modes. In order to simulate changing operating conditions in a real afterburner, the coupling coefficient and the time-lag in the heat release rate are changed abruptly during the time history calculation. The change in coupling coefficient has no dramatic effect, while the change in time-lag can lead to mode switch. This is examined in detail by the phase analysis, which reveals that mode switch is also a nonlinear effect.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"600 ","pages":"Article 118899"},"PeriodicalIF":4.3,"publicationDate":"2024-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143175945","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":"Defect quantification evaluation of a rolling element bearing based on physical modelling and instantaneous vibration energy investigation","authors":"Maolin Luo ,&nbsp;Yu Guo ,&nbsp;Zuqiang Su ,&nbsp;Hugo André ,&nbsp;Zhi Tang ,&nbsp;Chen Zhou ,&nbsp;Chao Li","doi":"10.1016/j.jsv.2024.118875","DOIUrl":"10.1016/j.jsv.2024.118875","url":null,"abstract":"<div><div>The estimation of defect size of rolling element bearing (REB) is expected to remain a significant and challenging task in vibration-based condition monitoring of rotating machinery. The conventional approaches focus on extracting the time spacing of the double impulse signal to estimate the defect size of the REB which is subsequently found to be inaccurate and arbitrary. In this paper, a novel model is developed to estimate the defect size of the REB based on the theories of physics and kinematics, in which the multi-event excitations, i.e. the entry, destressing and collision generated by the rolling element-defect interaction, are considered and investigated. The kinematic and geometric contact mechanism, which is mapped onto the rolling element-defect interaction as the rolling element passes over the defect zone, are analysed and modelled as a function of the time information. In view of the fact that the variation of the vibration energy contained in the multi-impact vibration response is deeply mapped to the time information, a novel idea is proposed to extract the time information by analysing the instantaneous energy variation of the defect-induced impulse using the scheme of the autoregressive model and the smooth pseudo Wigner–Ville distribution. The proposed model and idea are validated by experiments under different defect size and rotational speed scenarios. The results calculated by the proposed model show good agreement with the real defect size. Experimental and modelling comparisons show that the proposed model has reliable effectiveness and good performance and confidence in quantifying the size of the defect area localized on the outer raceway of the REB, and can provide some theoretical guidance for damage detection and remaining useful life prediction of the REB.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"600 ","pages":"Article 118875"},"PeriodicalIF":4.3,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143177359","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}