Journal of Vibration and Acoustics-Transactions of the Asme最新文献_第4页

Characteristics of Self-excited Vibration of Vertical Rotating Shaft System Considering Amplitude dependent Nonlinearity of Sliding Bearing 考虑滑动轴承幅值非线性的垂直转轴系统自激振动特性

IF 1.7 4区工程技术

Journal of Vibration and Acoustics-Transactions of the Asme Pub Date : 2022-10-14 DOI: 10.1115/1.4055976

Y. Watanabe, T. Inoue

{"title":"Characteristics of Self-excited Vibration of Vertical Rotating Shaft System Considering Amplitude dependent Nonlinearity of Sliding Bearing","authors":"Y. Watanabe, T. Inoue","doi":"10.1115/1.4055976","DOIUrl":"https://doi.org/10.1115/1.4055976","url":null,"abstract":"\u0000 Journal sliding bearings are often used to support rotating machinery to add damping and increase load capacity. These bearings have strong nonlinearities that can cause vibration problems. Various studies have been conducted on vibration phenomena caused by nonlinearities in journal sliding bearings. However, most of these studies have been on horizontally supported rotating machines. Some of these techniques are difficult to apply to vertically supported rotating machines. The most significant difference between horizontal and vertical support is that the weight of the rotor does not act on the journal sliding bearing in the case of vertical support. Therefore, it is not appropriate to use the horizontal journal sliding bearing theory based on the equilibrium point for the vertical shaft, but rather, it should be considered based on the whirling orbit. In this paper, the nonlinear rotor dynamics of vertical rotating machines with journal sliding bearings are investigated and evaluated by theoretical and numerical analyses and experiments of a simple vertical rotating shaft. As a result, some new destabilization and stabilization phenomena are found in the vertical shaft system, and it is clarified that they can not be predicted by the conventional linear analysis around equilibrium point, but can be predicted by the nonlinear dynamical analysis of whirling orbit. Particularly, these destabilization and stabilization phenomena of vertical shaft system are strongly affected by the magnitude of the vibration in the journal sliding bearing due to its nonlinearity, and the unbalance of the rotating body can be a parameter to control them.","PeriodicalId":49957,"journal":{"name":"Journal of Vibration and Acoustics-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2022-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84955803","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 1

Acoustic Wave Manipulation by Phase Conjugate Metasurface 相位共轭超表面对声波的操纵

IF 1.7 4区工程技术

Journal of Vibration and Acoustics-Transactions of the Asme Pub Date : 2022-10-07 DOI: 10.1115/1.4055917

X. Cai, Zhandong Huang, Chunguang Wang, P. Jia, Jun Yang, Liwen Zhang

引用次数: 0

Free Vibration Analysis of Elastically Restrained Laminated Planar Frames 弹性约束层合平面框架的自由振动分析

IF 1.7 4区工程技术

Journal of Vibration and Acoustics-Transactions of the Asme Pub Date : 2022-10-05 DOI: 10.1115/1.4055875

Richard Bachoo

{"title":"Free Vibration Analysis of Elastically Restrained Laminated Planar Frames","authors":"Richard Bachoo","doi":"10.1115/1.4055875","DOIUrl":"https://doi.org/10.1115/1.4055875","url":null,"abstract":"\u0000 A wave-based model that incorporates the effects of shear deformation, rotary inertia and elastic coupling due to structural anisotropy, is developed to analyze the free vibrations of elastically restrained laminated planar frames. In this work, a generalized frame structure is represented as an assemblage of laminated beam segments that act as one-dimensional waveguides. The segments are assumed to undergo only in-plane motion, which upon applying Hamilton's principle, is described by a sixth order coupled differential equation. Dispersion analysis is conducted and the nature of the wavefields associated with the propagation matrix is discussed. Generally restrained boundaries and internal joints are considered, and the associated reflection and transmission matrices are derived. Using the principle of wave-train closure, a closed-form characteristic equation is obtained by systematically assembling the propagation, reflection and transmission matrices. The wave-based model is inherently deterministic, and solving the characteristic equation offers the advantage of determining the exact natural frequencies using conventional root finding algorithms. Application of the proposed model is demonstrated by analyzing an elastically restrained inclined laminated portal frame. Extensive computational analysis is conducted to illustrate the influence of stacking sequence, frame angle, relative frame length, orthotropicity ratios and spring stiffness on the exact natural frequencies (and in certain cases the mode shapes) of the frame. Independent finite element simulations conducted in ANSYS® APDL are consistently used to verify the validity of the analytical results.","PeriodicalId":49957,"journal":{"name":"Journal of Vibration and Acoustics-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2022-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90708848","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 1

Preface: The Centennial Anniversary of the Timoshenko-Ehrenfest Beam Model 前言:Timoshenko-Ehrenfest梁模型一百周年纪念

IF 1.7 4区工程技术

Journal of Vibration and Acoustics-Transactions of the Asme Pub Date : 2022-10-05 DOI: 10.1115/1.4055874

I. Elishakoff, D. Segalman, Firas A. Khasawneh

引用次数: 1

Broadening band gaps of Bragg scattering phononic crystal with graded supercell configuration 梯度超级单体结构Bragg散射声子晶体增宽能带

IF 1.7 4区工程技术

Journal of Vibration and Acoustics-Transactions of the Asme Pub Date : 2022-10-05 DOI: 10.1115/1.4055876

Yuanyuan Ye, Chaosheng Mei, Li Li, Xuelin Wang, L. Ling, Yujin Hu

{"title":"Broadening band gaps of Bragg scattering phononic crystal with graded supercell configuration","authors":"Yuanyuan Ye, Chaosheng Mei, Li Li, Xuelin Wang, L. Ling, Yujin Hu","doi":"10.1115/1.4055876","DOIUrl":"https://doi.org/10.1115/1.4055876","url":null,"abstract":"\u0000 A new phononic crystal with graded supercell configuration is proposed to broaden the Bragg scattering band gaps. The proposed phononic crystal is made up of a periodic arrangement of supercells, and the supercells are composed of unit cells with graded structural parameters. The mechanical model of the graded phononic crystals is established based on transfer matrix method to investigate in-plane elastic waves propagating and band structures of the periodic system. Numerical results show that the graded structural design can merge adjacent multiple band gaps into an extremely broad one. Modal analysis shows that the mechanism of band gap broadening is that the graded supercell configuration breaks some symmetries of the phononic crystal, resulting in the opening of Dirac cone and creation of new band gaps. The effects of the main structural parameters related to graded supercell design on band gap broadening are studied by simulation and verified by experiment. The present study is beneficial to the design of new functional materials with broadband vibration isolation performance.","PeriodicalId":49957,"journal":{"name":"Journal of Vibration and Acoustics-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2022-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86177052","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 1

A model for sound propagation through corrugated porous structures with mean flow 具有平均流动的波纹多孔结构声传播模型

IF 1.7 4区工程技术

Journal of Vibration and Acoustics-Transactions of the Asme Pub Date : 2022-10-03 DOI: 10.1115/1.4055847

Harshavardhan Ronge, Shripad A. Upalkar, A. Wagh, Radhika Choudhary, Shankar Krishnan, S. Ramamoorthy

{"title":"A model for sound propagation through corrugated porous structures with mean flow","authors":"Harshavardhan Ronge, Shripad A. Upalkar, A. Wagh, Radhika Choudhary, Shankar Krishnan, S. Ramamoorthy","doi":"10.1115/1.4055847","DOIUrl":"https://doi.org/10.1115/1.4055847","url":null,"abstract":"\u0000 For applications of porous materials where mean pressure drop is a concern, packaging the material into a corrugated structure is better compared to other geometries such as block or wedge shapes. The goal of this study is to integrate noise reduction functionality within that material, which requires an understanding of the sound propagation through corrugated porous structures, including flow effects. The corrugated porous structure involves porous partitions separating inlet and outlet fluid channels. The porous materials considered are periodic octet-truss and body-centered cubic unit cells, and sound propagation across these porous partitions is modeled using the Johnson-Champoux-Allard model. The predicted transmission loss (TL) is benchmarked using designed additively manufactured corrugated structures measured using a flow duct. The laminar flow regime is maintained across the porous structure to reduce flow-noise effects. It is shown that the TL for a given corrugated structure increases with a decrease in porosity, and the impact of flow becomes significant as the porosity decreases. The influence of flow on TL also depends on the unit cell configuration. Furthermore, the model provides insights on pressure and acoustic particle velocity distributions within the corrugated structure and reveals regions of the porous material that effectively participate in noise reduction.","PeriodicalId":49957,"journal":{"name":"Journal of Vibration and Acoustics-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89894122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 2

Broadband sound transmission loss in a corrugated sound panel using periodic structure theory 利用周期结构理论研究波纹声板的宽带声传输损耗

IF 1.7 4区工程技术

Journal of Vibration and Acoustics-Transactions of the Asme Pub Date : 2022-09-27 DOI: 10.1115/1.4055806

Rajan Prasad, A. Baxy, A. Banerjee

引用次数: 0

Wave propagation in Timoshenko-Ehrenfest nanobeam: A mixture unified gradient theory Timoshenko-Ehrenfest纳米梁中的波传播:混合统一梯度理论

IF 1.7 4区工程技术

Journal of Vibration and Acoustics-Transactions of the Asme Pub Date : 2022-09-27 DOI: 10.1115/1.4055805

S. Faghidian, I. Elishakoff

{"title":"Wave propagation in Timoshenko-Ehrenfest nanobeam: A mixture unified gradient theory","authors":"S. Faghidian, I. Elishakoff","doi":"10.1115/1.4055805","DOIUrl":"https://doi.org/10.1115/1.4055805","url":null,"abstract":"\u0000 A size-dependent elasticity theory, founded on variationally consistent formulations, is developed to analyze the wave propagation in nano-sized beams. The mixture unified gradient theory of elasticity, integrating the stress gradient theory, the strain gradient model, and the traditional elasticity theory, is invoked to realize the size-effects at the ultra-small scale. Compatible with the kinematics of the Timoshenko–Ehrenfest beam, a stationary variational framework is established. The boundary-value problem of dynamic equilibrium along with the constitutive model is appropriately integrated into a single functional. Various generalized elasticity theories of gradient type are restored as particular cases of the developed mixture unified gradient theory. The flexural wave propagation is formulated within the context of the introduced size-dependent elasticity theory and the propagation characteristics of flexural waves are analytically addressed. The phase velocity of propagating waves in CNTs is inversely reconstructed and compared with the numerical simulation results. A viable approach to inversely determine the characteristic length-scale parameters associated with the generalized continuum theory is proposed. A comprehensive numerical study is performed to demonstrate the wave dispersion features in a Timoshenko–Ehrenfest nanobeam. Based on the presented wave propagation response and ensuing numerical illustrations, original benchmark for numerical analysis is detected.","PeriodicalId":49957,"journal":{"name":"Journal of Vibration and Acoustics-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2022-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91063456","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 11

Reformulation for the Solution of the Dynamic Response of Co-axial Segmented Beams 同轴分段梁动力响应解的重新表述

IF 1.7 4区工程技术

Journal of Vibration and Acoustics-Transactions of the Asme Pub Date : 2022-09-27 DOI: 10.1115/1.4055807

D. Segalman, Firas A. Khasawneh

{"title":"Reformulation for the Solution of the Dynamic Response of Co-axial Segmented Beams","authors":"D. Segalman, Firas A. Khasawneh","doi":"10.1115/1.4055807","DOIUrl":"https://doi.org/10.1115/1.4055807","url":null,"abstract":"\u0000 Stepped beams constitute an important class of engineering structures whose vibration response has been widely studied. Many of the existing methods for studying stepped beams manifest serious numerical difficulties as the number of segments or the frequency of excitation increase. In this paper, we focus on the Transfer Matrix Method (TMM), which provides a simple and elegant formulation for multi-step beams. The main idea in the TMM is to model each step in the beam as a uniform element whose vibration configurations are spanned by the segment's local eigenfunctions. Utilizing these local expressions, the boundary conditions at the ends of the multi-step beam as well as the continuity and compatibility conditions across each step are used to obtain the nonlinear eigenvalue problem. Also, and perhaps more importantly, we provide a reformulation for multi-step Euler-Bernoulli beams that avoids much of the numerical singularity problems that have plagued most of the earlier efforts. When this reformulation is extended to multi-segment Timoshenko beams, the numerical difficulties appear to be mitigated, but not solved.","PeriodicalId":49957,"journal":{"name":"Journal of Vibration and Acoustics-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2022-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87738225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 1

Optimization of Band Gaps in Rotors With Longitudinal Periodicity and Quasi-Periodicity 纵向周期性和准周期性转子带隙的优化

IF 1.7 4区工程技术

Journal of Vibration and Acoustics-Transactions of the Asme Pub Date : 2022-09-27 DOI: 10.1115/1.4055808

Patrick Bueno Lamas, R. Nicoletti

引用次数: 1