Journal of Sound and Vibration最新文献

{"title":"Acoustic-modeling of random fibrous materials","authors":"Xiangjun Peng ,&nbsp;Yuxuan Huang ,&nbsp;Chenlei Yu ,&nbsp;Xiangyu Xie ,&nbsp;Wei He ,&nbsp;Tian Jian Lu","doi":"10.1016/j.jsv.2024.118897","DOIUrl":"10.1016/j.jsv.2024.118897","url":null,"abstract":"<div><div>We present a microstructure-based model for determining the sound absorption behavior and transport parameters of random fibrous materials and exploring the physical mechanisms underlying acoustic energy dissipation. In order to increase the generalizability of the model, a three-dimensional random fiber structure is employed for simulation. The propagation of sound waves is associated with four transport parameters, including viscous permeability, tortuosity, as well as viscous and thermal characteristic lengths. These parameters are determined by the porosity and diameter of the fibrous material. By using the method of multi-scale asymptotic simulation, the theoretical model for transport parameters includes unknown coefficients that are adjusted based on the simulated results. The sound absorption coefficients are then obtained by integrating the transport parameters into the widely-used Johnson-Champoux-Allard (JCA) model for porous materials. The theoretical predictions match well with existing experimental measurements on sintered fiber metals and fibrous copper wires. Our model systematically examines the impact of fiber diameter, porosity, and material thickness on sound absorption performance. Optimal results are achieved by carefully selecting fiber diameter and porosity to enhance the acoustic dissipation of sound waves, while thicker fibrous materials increase sound absorption in the low frequency range. The model provides a theoretical framework for designing and fabricating fibrous materials to reduce noise.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"600 ","pages":"Article 118897"},"PeriodicalIF":4.3,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143175470","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":"Self-sensing sliding mode control of workpiece chatter based on accurate prediction of machining vibration","authors":"Zhenmin Li ,&nbsp;Qinghua Song ,&nbsp;Jixiang Gong ,&nbsp;Xinyu Yang ,&nbsp;Jing Qin ,&nbsp;Haifeng Ma ,&nbsp;Zhanqiang Liu","doi":"10.1016/j.jsv.2024.118887","DOIUrl":"10.1016/j.jsv.2024.118887","url":null,"abstract":"<div><div>The previous works concerning active chatter suppression in milling systems are generally carried out based on specially designed tool holders or spindles. Due to the continuous removal of materials, however, the workpiece system cannot be treated as quasi-static or rigid. In this paper, a manufacturing system based on the digital twins (DT) model and sliding mode (SM) controller is developed to suppress the milling chatter of thin-walled workpieces. A single degree of freedom (DOF) model of the workpiece is adopted to describe the milling system. The developed SM algorithm exhibits a good performance under the variations of modal parameters, cutting parameters, unmodeled dynamics, etc. To provide accurate control feedback, a DT model of workpiece vibration is established by presenting a self-sensing predictive method. The predictive methods are implemented based on the cooperation of the combination methods of beam functions (CMOBF) and the mode superposition method (MSM). In addition, the predictive accuracy is discussed quantitatively by establishing a dataset of error coefficients. The data of error coefficients are trained by the support vector machine (SVM) model, which is introduced to the predictive methods for further error modification. Finally, a DT framework is introduced briefly to combine the machining system and the control process. Based on the developed DT-driven manufacturing system, the information interaction between the control process and the vibrating system can be realized.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"600 ","pages":"Article 118887"},"PeriodicalIF":4.3,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143175469","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":"Stability and dynamic response of centrifugal pendulum vibration absorber based on nonlinear hybrid damping","authors":"Yizhe Zhang ,&nbsp;Yi Zhang ,&nbsp;Massimiliano Gobbi ,&nbsp;Guangqiang Wu","doi":"10.1016/j.jsv.2024.118869","DOIUrl":"10.1016/j.jsv.2024.118869","url":null,"abstract":"<div><div>Centrifugal pendulum vibration absorber (CPVA) have emerged as an extremely effective method to mitigate torsional vibrations in rotating machinery. Previous studies have predominantly focused on viscous damping between pendulums and rotor, largely ignoring other damping mechanisms. However, recent experimental endeavors have revealed a hybrid damping concept that combines rolling and viscous damping, providing a more realistic portrayal of CPVA dynamics in vehicular applications. This study builds on prior investigations by incorporating nonlinear hybrid damping of the pendulums and investigating the steady-state and transient behavior of the CPVA within gravitational and centrifugal force fields. We propose a methodology for deriving pendulum equations of motion based on perturbation and multiple scales. Subsequently, we investigated the CPVA’s critical stability and bifurcation as well as a variety of nonlinear phenomena, using numerical simulations to validate our results. Furthermore, our study revealed a novel phenomenon known as the ‘phase jump’ for the pendulum. It is worth noting that the CPVA’s dynamic performance can be improved and the local nonlinear response can be reduced by adjusting the share and magnitude of the rolling and viscous damping coefficients. This study provides insights for optimizing the CPVA’s performance and advancing its efficacy.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"600 ","pages":"Article 118869"},"PeriodicalIF":4.3,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143175947","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":"Target-free vision method for planar displacement measurement of structures subjected to out-of-plane movement by UAV","authors":"Dong Tan ,&nbsp;Jun Li ,&nbsp;Hong Hao","doi":"10.1016/j.jsv.2024.118873","DOIUrl":"10.1016/j.jsv.2024.118873","url":null,"abstract":"<div><div>In the field of structural health monitoring, one of the essential tasks is to measure dynamic responses such as vibration displacement. With the recent advancement in computer vision, cameras are developed as alternative tools to traditional displacement sensors. Unmanned aerial vehicles (UAVs) offer mobility and can handle complex real-world situations. However, limitations of using UAVs, particularly self-motions, have hindered the accuracy in vibration displacement measurements. This paper proposes a target-free vision-based approach for measuring dynamic displacement responses using UAV. A series of videos of a beam subjected to planar motions are captured using a UAV. Stationary features on the background and target features on the structure are detected using features from accelerated segment test with adaptive threshold strategy and tracked using the Kanade–Lucas–Tomasi. UAV self-motions are estimated using motion-only bundle adjustment. Dynamic displacement responses of the structure are computed based on the displacements of target features and UAV self-motions. Results of the displacement responses and identified natural frequencies with different planar motion types and shooting angles are obtained. They are compared with those obtained by linear variable differential transducers, which demonstrates the accuracy of the proposed method for vibration displacement response measurement.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"600 ","pages":"Article 118873"},"PeriodicalIF":4.3,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143177353","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":"Investigation on the dominant mechanism of chatter in high-load robot milling process based on theoretical and experimental analysis","authors":"Yuchao Du ,&nbsp;Zhiqiang Liang ,&nbsp;Zirui Gao ,&nbsp;Sichen Chen ,&nbsp;Yi Yue ,&nbsp;Jiabo Zhang ,&nbsp;Hanliang Liu ,&nbsp;Haoran Zheng ,&nbsp;Baolong Liu ,&nbsp;Tianyang Qiu ,&nbsp;Zhibing Liu","doi":"10.1016/j.jsv.2024.118886","DOIUrl":"10.1016/j.jsv.2024.118886","url":null,"abstract":"<div><div>Chatter has always been a key problem restricting the improvement of robotic milling quality and efficiency. To avoid chatter, it is necessary to determine what is the dominant chatter mechanism (mode coupling or regenerative) of the robot milling system. Therefore, this paper focus on the dominant chatter mechanism in high-load (600kg) robot milling. The modal test results show that the dynamic flexibility of spindle-tool structure mode in high-load robot is significantly higher than that of the body structure mode, which is significantly different from the low-load robot in other studies. The mode coupling chatter stability prediction models are established based on eigenvalue method and zeroth order approximation, and the predicted stability boundaries are compared with the experimental results. The results show that only high-frequency chatter exists in the high speed region (1000–8000rpm), and no low frequency chatter occurs. The low-frequency chatter around the robot body mode is found in the low-speed region (400–1000rpm), but the mode coupling chatter theory could not explain the chatter varies periodically with the spindle speed. However, the stability boundary predicted by the regenerative chatter theory also changes periodically with the spindle speed. This indicates that the milling chatter dominant mechanism of high load robot is regenerative chatter. This study analyzes the milling chatter dominant mechanism of high-load robot through theoretical and experimental verification, which can provide theoretical support for high-load robot milling chatter control.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"600 ","pages":"Article 118886"},"PeriodicalIF":4.3,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143175949","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":"Concave-shaped acoustic black holes with asymmetric arrangement for suppression and amplification of structural vibration","authors":"Seongmin Park,&nbsp;Wonju Jeon","doi":"10.1016/j.jsv.2024.118885","DOIUrl":"10.1016/j.jsv.2024.118885","url":null,"abstract":"<div><div>An acoustic black hole (ABH) is a wedge-shaped structure characterized by a power-law thickness profile with an exponent greater than or equal to two. In this study, we engineer an ABH with a concave shape, where both the width and thickness decrease according to power-law profiles. This configuration facilitates the focusing of elastic waves at the tip region with higher energy density than conventional constant-width ABHs. The highly focused waves are attenuated using a small amount of viscoelastic material attached near the tip of the ABH, resulting in dampened vibrations in the original structure such as a thin beam. Despite being about half the weight of the conventional ABH of equivalent length, the concave ABH achieves similar damping performance to the conventional one. When the conventional ABH is adjusted to match the weight of our concave design, the latter exhibits enhanced damping performance along with a lower cut-on frequency. Near-perfect reduction of structural vibration is attained by affixing a concave ABH to each end of the beam. By delicately adjusting their lengths and employing them asymmetrically, we manipulate the vibration mode shapes to minimize the structural vibrations. As a result, vibrations in the beam are barely perceptible under high-frequency harmonic excitation. The concave ABH, characterized by its ability to intensively focus elastic waves at its narrow and thin tip, is also suitable for vibration amplification, facilitating the detection of minute vibrations distributed in the original structure. The concave ABH offers improved performance in both wave absorption and amplification compared with conventional ABHs of the same length or weight, highlighting its potential as an alternative solution in vibration damping or sensing applications.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"600 ","pages":"Article 118885"},"PeriodicalIF":4.3,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143175927","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":"Multi-scale analysis of the mapping relationship between turnout irregularities and vehicle responses based on cross-wavelet transform","authors":"Xueyang Tang ,&nbsp;Xiaopei Cai ,&nbsp;Yuqi Wang ,&nbsp;Fei Yang","doi":"10.1016/j.jsv.2024.118884","DOIUrl":"10.1016/j.jsv.2024.118884","url":null,"abstract":"<div><div>Track irregularities significantly impact the dynamic performance of vehicles passing through turnouts. Despite this, the precise mapping relationship between these irregularities and vehicle responses remains unclear. Utilizing measured data, the inherent irregularities of turnouts were extracted using improved complete ensemble empirical mode decomposition with adaptive noise (ICEEMDAN). The mapping relationship between the wavelength, spatial position, and time lag effect of turnout inherent irregularities and vehicle responses was analyzed using cross-wavelet transform (CWT). The first-order and second-order intrinsic modal components within the original irregularities distinctly reflect the inherent characteristics of the switch and crossing panels. The inherent irregularities in these panels respectively correspond to the vertical and lateral accelerations of the vehicle within the wavelength ranges of 2∼4 m and 4∼8 m. Within the switch panel, the longitudinal levels of the right rail and the twist exert the most significant influence on the vehicle's vertical acceleration, accounting for 17.80 % and 22.89 % respectively. In the crossing panel, the track gauge and the alignments of the right rail have the greatest impact on the vehicle's lateral acceleration, accounting for 24.72 % and 35.18 % respectively.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"600 ","pages":"Article 118884"},"PeriodicalIF":4.3,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143177354","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":"Wave propagation modelling approach for improved assessment of the acoustic field in closed test section wind tunnels","authors":"Hugo F. Mourão Bento ,&nbsp;Colin P. VanDercreek ,&nbsp;Francesco Avallone ,&nbsp;Daniele Ragni ,&nbsp;Pieter Sijtsma ,&nbsp;Mirjam Snellen","doi":"10.1016/j.jsv.2024.118858","DOIUrl":"10.1016/j.jsv.2024.118858","url":null,"abstract":"<div><div>Sound propagation in closed test section wind tunnels suffers from reflections and diffraction, which compromise acoustic measurements. In this article, it is proved possible to improve the post-processing of phased-array microphone measurements by using an approach based on the combination of numerical acoustic simulations and beamforming. A Finite Element Method solver for the Helmholtz equation is used to model the acoustic response of the experimental facility. The simulations are compared with acoustic experiments performed at TU Delft’s Low Turbulence Tunnel, using both fully reflective (baseline) and lined test sections. The solver accurately predicts the acoustic propagation from a monopole sound source at the centre of the test section to the microphones in the phased-array, for frequencies in the range <span><math><mrow><mn>500</mn><mspace></mspace><mstyle><mi>H</mi><mi>z</mi></mstyle><mo>&lt;</mo><mi>f</mi><mo>&lt;</mo><mn>2000</mn><mspace></mspace><mstyle><mi>H</mi><mi>z</mi></mstyle></mrow></math></span>. It is shown that a (lower fidelity) geometric modelling method is unable to precisely predict the acoustic response of the Low Turbulence Tunnel at these frequencies, due to strong acoustic diffraction. The numerical results are used to implement corrections to the post-processing of experimental data. A corrected version of the Source Power Integration method is able to increase the accuracy of the source’s noise levels calculation, based on a single numerical simulation with the source at the same location as in the experiment. A Green’s function correction increases the beamforming resolution and the source’s noise levels estimation accuracy from the beamforming maps, without a priori knowledge of the source’s location. Both corrections perform well at processing flow-on acoustic measurements, and the Green’s function correction shows an additional benefit. The improvement in beamforming spatial resolution leads to an increase of the signal to noise ratio.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"600 ","pages":"Article 118858"},"PeriodicalIF":4.3,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143177355","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":"Singular-perturbation-based estimation of nominal input gain in lightly damped systems with multiple modes","authors":"Jiedong Li ,&nbsp;Mingwei Sun ,&nbsp;Yongshuai Wang ,&nbsp;Zengqiang Chen","doi":"10.1016/j.jsv.2024.118857","DOIUrl":"10.1016/j.jsv.2024.118857","url":null,"abstract":"<div><div>Active disturbance rejection controllers have been widely employed for governing a class of high-dimensional lightly damped systems with multiple eigenmodes. Nevertheless, previous studies rarely focused on the impact of neglected fast resonant mode dynamics on the nominal input gain, especially if high-frequency unmodeled resonant dynamics gradually approach the target control bandwidth. Here, we have quantitatively analyzed the effect of fast resonant mode dynamics on the nominal input gain using the singular perturbation method. A practical method for estimating the nominal input gain is provided for various control bandwidths. The stability bound associated with the fast resonant mode and coupling dynamics between the slow and fast resonant modes is also investigated. Finally, the validity and superiority of the proposed method are demonstrated through simulations.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"600 ","pages":"Article 118857"},"PeriodicalIF":4.3,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143175467","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":"Modal Complexity Factors as indexes for modal parameter identification in Operational Modal Analysis of coupled dynamic systems","authors":"J. Ibarrola-Chamizo ,&nbsp;I. Agirre-Olabide ,&nbsp;M. Merino ,&nbsp;J. Aginaga","doi":"10.1016/j.jsv.2024.118860","DOIUrl":"10.1016/j.jsv.2024.118860","url":null,"abstract":"<div><div>Vibration analysis seeks to extract the modal parameters of a mechanical system by means of experimental measurements. Natural frequencies, damping ratios and mode shapes are identified from the measurements data from experimental or operational modal analysis. Modal shapes can show real or complex values. The degree of complexity of a modal shape can be measured by the Modal Complexity Factors (MCF). Among others, modal complexity can be due to non-uniformly distributed damping. In complex mechanical systems like a robot, complex modes are expected due to its active and non distributed damping. In turn, in a metallic workpiece real modes are expected. In the robotic machining of thin workpieces, both the robot and the workpiece constitute a coupled dynamic system, operating within the same frequency range. This work proposes the use of MCFs as indexes to determine if each mode corresponds to the workpiece or the robot. Experimental results of an operational modal analysis show a lower mode complexity for the workpiece modes and a higher complexity for the robot frequencies. MCFs show a good performance in separating modes of such coupled systems due to the different damping nature of the robot and the workpiece.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"600 ","pages":"Article 118860"},"PeriodicalIF":4.3,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143177356","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}