Journal of Sound and Vibration最新文献_第5页

Coupled thermo-elastic dynamics of rotating pre-twisted blades exposed to thermal shock including nonlinear rotational effects 暴露于热冲击的旋转预扭叶片的耦合热弹性动力学，包括非线性旋转效应

IF 4.3 2区工程技术

Journal of Sound and Vibration Pub Date : 2024-08-14 DOI: 10.1016/j.jsv.2024.118669

{"title":"Coupled thermo-elastic dynamics of rotating pre-twisted blades exposed to thermal shock including nonlinear rotational effects","authors":"","doi":"10.1016/j.jsv.2024.118669","DOIUrl":"10.1016/j.jsv.2024.118669","url":null,"abstract":"<div><p>Rotating blades operating under high-temperature experience intense mechanical and thermal stresses induced by centrifugal forces and thermal shock. In this research, to address this critical yet understudied topic, coupled thermo-elastic dynamics of rotating blades incorporating precise rotational effects is investigated. A comprehensive modeling approach, characterizing blade geometry in terms of pre-twist and pre-set angles is employed based on the theory of surfaces. Thermal strain–displacement field is defined based on third-order shear deformation theory in the model integrated with a third-order expansion of temperature change distribution within the blade. Rotational factors related to Coriolis, centrifugal stiffening, and rotational softening effects are considered. In the case of stiffening effects, two different modeling approaches including direct integration of centrifugal forces (DICFs), and pre-stressed dynamics about steady-state equilibrium deformations (SSEDs) are employed. When incorporating large-amplitude SSEDs in the latter, nonlinear rotational effects are incorporated into the model. To overcome the complexity arising from coupled thermo-elasticity, and rotational motion, the spectral Chebyshev technique is applied to the derived integral boundary value problems and coupled energy equations. Finally, natural frequencies, and thermal and centrifugal deformations are investigated comprehensively by including DICFs and pre-stressed dynamics. Results show that thermo-elastic dynamics of the system is highly affected by the modeling approaches used for centrifugal stiffening effects.</p></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142020616","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 adjoint Green’s function approach for thermoacoustic instabilities in a duct with mean flow 平均流管道中热声不稳定性的格林函数辅助方法

IF 4.3 2区工程技术

Journal of Sound and Vibration Pub Date : 2024-08-11 DOI: 10.1016/j.jsv.2024.118673

{"title":"An adjoint Green’s function approach for thermoacoustic instabilities in a duct with mean flow","authors":"","doi":"10.1016/j.jsv.2024.118673","DOIUrl":"10.1016/j.jsv.2024.118673","url":null,"abstract":"<div><p>Thermoacoustic instabilities arise from the feedback between an acoustic field and the unsteady heat released in a burner, yielding self-sustained oscillations. A fundamental framework for modelling thermoacoustic instabilities in systems where a mean flow is present is introduced, based on the definition of the adjoint Green’s function which permits to convert the acoustic analogy equation into an integral equation. The adjoint Green’s problem produces sensitivity functions which quantify the response of the system to initial, boundary or other forcing terms. A simple one-dimensional system is examined; it includes a steady uniform mean flow and a nonlinear heat source with an amplitude-dependent time-delay heat release model. The versatility of the approach is demonstrated by applying it to two resonators characterized by different acoustic boundary conditions: a Rijke tube and a quarter-wave resonator. The control parameters are: heat source position, heater power and tube length. The results reveal that the proposed analytical framework successfully captures the limit cycles, triggering phenomena, hystereses, and Hopf bifurcations observed in experiments. We show that the mean flow velocity cannot be discarded in the study of such systems; by increasing it, a stabilization generally ensues, with a modification of the bistability characteristics of the system.</p></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0022460X24004358/pdfft?md5=c7d011c009672a04a523b9ad6e2e67db&pid=1-s2.0-S0022460X24004358-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141998539","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}

引用次数: 0

Suppression of nonsynchronous vibration in a foil air bearing rotor system through piezoelectric actuation of the top foil—A theoretical investigation 通过压电驱动顶箔抑制箔式空气轴承转子系统中的非同步振动--理论研究

IF 4.3 2区工程技术

Journal of Sound and Vibration Pub Date : 2024-08-11 DOI: 10.1016/j.jsv.2024.118675

{"title":"Suppression of nonsynchronous vibration in a foil air bearing rotor system through piezoelectric actuation of the top foil—A theoretical investigation","authors":"","doi":"10.1016/j.jsv.2024.118675","DOIUrl":"10.1016/j.jsv.2024.118675","url":null,"abstract":"<div><p>It is well documented that the static and dynamic performance of foil air bearings (FABs) can be improved through the alteration of the radial clearance profile. One way of achieving such controllability is through piezoelectric actuation of the top foil. Such a piezoelectric foil air bearing (PFAB) avoids the dynamics complications introduced by alternative actuating mechanisms. So far, theoretical analysis of a PFAB pad in isolation has shown that top foil actuation can raise the static load capacity. This paper theoretically investigates the potential for improving the dynamic performance. A computational approach that uses Galerkin Reduction (GR) to model the air film and considers the detachment of the top foil from the bump foil is upgraded for multi-pad PFABs, thus facilitating parameter optimization. The investigation considers two conventional FAB rotor systems from the literature that exhibit strong sub-synchronous vibrations under high unbalance. It is found that the optimal voltage and placement of piezoelectric patches can result in total suppression of the strong sub-synchronous frequencies, as well as a rise in the onset of instability speed. The polarity of the voltage required for suppression of the sub-synchronous frequencies is found to be opposite to that required to raise the load capacity.</p></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142087459","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

Theoretical modeling and analysis of an equipment–shell multiple-transmission-path system with attached liquid-filled pipe 附带充液管道的设备外壳多传输路径系统的理论建模与分析

IF 4.3 2区工程技术

Journal of Sound and Vibration Pub Date : 2024-08-10 DOI: 10.1016/j.jsv.2024.118645

{"title":"Theoretical modeling and analysis of an equipment–shell multiple-transmission-path system with attached liquid-filled pipe","authors":"","doi":"10.1016/j.jsv.2024.118645","DOIUrl":"10.1016/j.jsv.2024.118645","url":null,"abstract":"<div><p>Vibrations generated by mechanical equipment are the main source of radiation noise for ships. In actual systems, there are multiple transmission paths for mechanical vibrations from the equipment to shell. Common paths include vertical support structures, such as vibration isolators, and lateral attachment structures, such as pipes. However, most existing models only consider a single-path scenario. Multi-path systems have more complex modal and vibration transmission characteristics and introduce more complex coupling problems. There is a lack of theoretical modeling and physical analyses of common multiple transmission systems in ships. In this study, a theoretical model of an equipment–shell multiple-transmission-path system with an attached liquid-filled pipe is established as a typical multiple-transmission-path system for ships. In this model, the liquid-filled pipe is solved using a newly proposed traveling-wave method based on Kennard shell theory. Based on the theoretical model, the effects of each type of traveling wave on the pipe on the system modal characteristics, the mechanism behind each path on the system coupling characteristics, the influence of structural parameters on system modal and vibration transmission characteristics, and the proportion of vibration transmitted by the two transmission paths are analyzed. This study provides theoretical insights and guidance for practical vibration and noise reduction engineering.</p></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141979289","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

Effects of serration angle on noise reduction mechanism of trailing edge serration 锯齿角度对后缘锯齿降噪机制的影响

IF 4.3 2区工程技术

Journal of Sound and Vibration Pub Date : 2024-08-10 DOI: 10.1016/j.jsv.2024.118672

{"title":"Effects of serration angle on noise reduction mechanism of trailing edge serration","authors":"","doi":"10.1016/j.jsv.2024.118672","DOIUrl":"10.1016/j.jsv.2024.118672","url":null,"abstract":"<div><p>This study investigates the effects of serration angle on the three-dimensional flow field and noise reduction mechanism of a NACA6512-63 airfoil using large eddy simulation (LES) and spectral proper orthogonal decomposition (SPOD) techniques. The serration angle is defined as the ratio of serration wavelength (<span><math><mi>λ</mi></math></span>) to serration amplitude (h). The mean flow field analysis on suction side of serration reveals the outward flow towards the serration edges and the downwash flow between the valleys that generate the counter-rotating vortex pair. This flow alteration changes the serration effective angle of the serration, consequently affecting the noise reduction performance. Additionally, by comparing the general solution of Lyu’s semi-analytical equation with the SPOD mode results, the noise reduction mechanism is examined, and the frequency range in which noise reduction occurs is analyzed. The linearly distributed multipole-like pressure patterns, similar to those in the semi-analytical solution, are observed in the low-frequency range for all three cases, with the <span><math><mi>λ</mi></math></span>/h = 0.3 case exhibiting the most effective noise reduction. The findings suggest that the local deviation of the turbulence axis, caused by the strong outward flow near the serration edges, can hinder the formation of the optimal pressure field distribution required for effective noise reduction.</p></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142049775","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

Multi-objective optimization and experiment of a bio-inspired floating slab isolation track 生物启发浮动板隔离轨道的多目标优化与实验

IF 4.3 2区工程技术

Journal of Sound and Vibration Pub Date : 2024-08-09 DOI: 10.1016/j.jsv.2024.118650

{"title":"Multi-objective optimization and experiment of a bio-inspired floating slab isolation track","authors":"","doi":"10.1016/j.jsv.2024.118650","DOIUrl":"10.1016/j.jsv.2024.118650","url":null,"abstract":"<div><p>In order to break through the limitation of the \"single-point\" design of Quasi-Zero Stiffness (QZS) property and satisfy multiple performance objectives, this study proposes a novel bio-inspired vibration isolator integrating the biological leg configuration and flexible joints, and conducts nonlinear analysis and experimental verification. Bio-inspired by the frog legs, the proposed isolator is a multilink structure consisting of two symmetrical bionic legs with long links (as bones) and scissor-like units (as joints). It is mounted on the lower level of the floating slab isolation track, which is simplified as a two-degree-of-freedom isolation system. For the actual requirement in the floating slab track, three performance indexes, including load carrying capacity, dynamic stiffness, and stability of isolation performance, are considered in structural optimization. Based on these optimization objectives, we carry out the multi-objective Pareto design criterion to achieve a collaborative optimization of the mechanical properties. Additionally, the experimental prototypes and low-frequency isolation experiments are carried out to verify the effectiveness of the multi-objective Pareto optimization framework. This bio-inspired isolator can effectively coordinate large loads and low-frequency vibration isolation problems and has promising applications in the field of rail transportation.</p></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142039986","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

Effective properties of randomly distributed poroelastic cylinders in a poroelastic matrix 孔弹性基体中随机分布的孔弹性圆柱体的有效特性

IF 4.3 2区工程技术

Journal of Sound and Vibration Pub Date : 2024-08-08 DOI: 10.1016/j.jsv.2024.118670

{"title":"Effective properties of randomly distributed poroelastic cylinders in a poroelastic matrix","authors":"","doi":"10.1016/j.jsv.2024.118670","DOIUrl":"10.1016/j.jsv.2024.118670","url":null,"abstract":"<div><p>Many media (such as geological formations or osseous tissues) are composites made up of at least two basic materials which can themselves obey complex constitutive laws. Such composites exhibit a wide range of mechanical properties that are essential to estimate using relatively simplified formulas. Here, wave propagation in a random heterogeneous medium (the composite) consisting of a distribution of parallel poroelastic cylinders in a poroelastic matrix is considered. The cylinders and the matrix are Biot’s porous media saturated with fluid. Expressions for the three effective wavenumbers (fast, slow and shear) are provided in the low frequency range using the Conoir and Norris multiple scattering formula accounting for wave conversions, up to the order of <span><math><msubsup><mrow><mi>n</mi></mrow><mrow><mn>0</mn></mrow><mrow><mn>2</mn></mrow></msubsup></math></span> (<span><math><msub><mrow><mi>n</mi></mrow><mrow><mn>0</mn></mrow></msub></math></span> is the number of cylinders per unit area). Basing upon this effective wavenumbers, quantities such as mass densities, bulk and shear poroelastic moduli, and diffusion coefficient are estimated at the static limit.</p></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141992746","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

Kriging-based accelerated prediction of frequency spectrum and acoustic field around rotating sources 基于克里金法的旋转声源周围频谱和声场加速预测

IF 4.3 2区工程技术

Journal of Sound and Vibration Pub Date : 2024-08-08 DOI: 10.1016/j.jsv.2024.118671

引用次数: 0

Modeling and traveling wave vibration analysis of rotating multi-ring hard coating double thin-walled cylindrical shells coupled structure considering connection mistuning 考虑连接失谐的旋转多环硬涂层双薄壁圆柱壳耦合结构的建模和行波振动分析

IF 4.3 2区工程技术

Journal of Sound and Vibration Pub Date : 2024-08-06 DOI: 10.1016/j.jsv.2024.118668

{"title":"Modeling and traveling wave vibration analysis of rotating multi-ring hard coating double thin-walled cylindrical shells coupled structure considering connection mistuning","authors":"","doi":"10.1016/j.jsv.2024.118668","DOIUrl":"10.1016/j.jsv.2024.118668","url":null,"abstract":"<div><p>Considering stiffness mistuning, position mistuning, and arc-length mistuning, a unified modeling approach is presented for the first time to investigate the traveling wave vibration of double thin-walled cylindrical shells coupled structure with multi-ring hard coating in a rotation state. Initially, a discontinuous arc connection is constructed to simulate a fault of bolt connection mistuning by improving the whole-circumference continuous artificial spring method. The elastic boundary conditions are simulated by using the artificial spring method. Meanwhile, a hard coating multi-ring strategy is more suitable for vibration suppression compared to the full coating strategy in practical applications, so the parametric multi-partitioning approach is utilized to model the multi-ring hard coating. Then, the dynamical equation is derived according to Sanders' shell theory and the Rayleigh-Ritz method. Finally, an efficient state space method is adopted to solve the traveling wave frequencies, and the validity of the theoretical method is verified through the literature. Furthermore, the influences of the mistuning Model, mistuning degree, and mistuning number on the traveling wave frequencies are analyzed. The analysis reveals that the influences of mistuning Models on the traveling wave frequencies are significantly different among the three mistuning types. The increase in mistuning degree and mistuning number leads to a decrease in traveling wave frequency, and the decrease range in the forward traveling wave frequency is greater compared to the backward traveling wave frequency.</p></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142020597","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

Defect Diagnosis of Bevel Gear System: A Study of Experimental and Simulated Signal 锥齿轮系统的缺陷诊断：实验和模拟信号研究

IF 4.3 2区工程技术

Journal of Sound and Vibration Pub Date : 2024-08-06 DOI: 10.1016/j.jsv.2024.118658

引用次数: 0