June 2019最新文献_第5页

Parametric Vibrations of Axially Moving Beams with Multiple Edge Cracks 多边裂纹轴向运动梁的参数振动

June 2019 Pub Date : 2019-06-01 DOI: 10.20855/IJAV.2019.24.21184

M. Sarıgül

引用次数: 3

Electromechanical Modeling and High Speed Design of a Tubular Ultrasonic Motor 管状超声电机的机电建模与高速设计

June 2019 Pub Date : 2019-06-01 DOI: 10.20855/IJAV.2019.24.21187

V. Dabbagh, A. Sarhan, J. Akbari, N. A. Mardi

引用次数: 0

Suppression of Vibrations Induced by FluctuatingWind for Long-Span Cable-Stayed Bridge UsingMR Dampers 用mr阻尼器抑制大跨度斜拉桥脉动风振

June 2019 Pub Date : 2019-06-01 DOI: 10.20855/IJAV.2019.24.21191

Zhao-dong Xu, Meng Xu, David Jia

{"title":"Suppression of Vibrations Induced by Fluctuating\u0000Wind for Long-Span Cable-Stayed Bridge Using\u0000MR Dampers","authors":"Zhao-dong Xu, Meng Xu, David Jia","doi":"10.20855/IJAV.2019.24.21191","DOIUrl":"https://doi.org/10.20855/IJAV.2019.24.21191","url":null,"abstract":"Cable-stayed bridges subjected to wind excitations will cause intense vibration due to their high flexibility in\u0000characteristic. Employment of magnetorheological (MR) dampers to realize the vibration smart-control of cablestayed bridges has become a considerable research topic in recent decades. In this paper, the plane truss finite\u0000element model (FEM) of a cable-stayed bridge with MR dampers is established. Fluctuating wind field is generated\u0000using the weighted amplitude wave superposition (WAWS) method and Kaimal spectrum, and then the time-history\u0000sample curve of wind speed is obtained. Fluctuating wind-induced vibration of the long-span cable-stayed bridge\u0000installed with MR dampers is analyzed by linear quadratic regulator (LQR) classical optimal control strategy and\u0000LQR tri-state control strategy. After the optimal control force is calculated by LQR classical optimal control\u0000strategy, control parameters and the input currents of MR dampers can be determined according to the windinduced vibration by LQR tri-state control. Results show that longitudinal and vertical wind-induced vibration\u0000responses of the box girder of the cable-stayed bridge are reduced obviously when MR dampers are arranged\u0000between the box girder and pylons.","PeriodicalId":227331,"journal":{"name":"June 2019","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126467932","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Vibration and Buckling of Skew Plates UnderLinearly Varying Edge Compression 斜板在线性变化边缘压缩下的振动与屈曲

June 2019 Pub Date : 2019-06-01 DOI: 10.20855/IJAV.2019.24.21215

Abhinav Kumar, S. K. Panda, S. C. Dutta

引用次数: 0

A Mixed Layerwise-Differential Quadrature Method for 3-D Vibration and Buckling Analyses of Orthogonally Stiffened Composite Conical Shell 正交加筋复合材料锥形壳三维振动和屈曲分析的混合分层-微分正交法

June 2019 Pub Date : 2019-06-01 DOI: 10.20855/IJAV.2019.24.21167

M. Talebitooti

{"title":"A Mixed Layerwise-Differential Quadrature Method for 3-D Vibration and Buckling Analyses of Orthogonally Stiffened Composite Conical Shell","authors":"M. Talebitooti","doi":"10.20855/IJAV.2019.24.21167","DOIUrl":"https://doi.org/10.20855/IJAV.2019.24.21167","url":null,"abstract":"A layerwise-differential quadrature method (LW-DQM) is developed for the vibration analysis of a stiffened laminated conical shell. The circumferential stiffeners (rings) and meridional stiffeners (stringers) are treated as discrete\u0000elements. The motion equations are derived by applying the Hamilton’s principle. In order to accurately account\u0000for the thickness effects and the displacement field of stiffeners, the layerwise theory is used to discretize the equations of motion and the related boundary conditions through the thickness. Then, the equations of motion as well\u0000as the boundary condition equations are transformed into a set of algebraic equations applying the DQM in the\u0000meridional direction. The advantage of the proposed model is its applicability to thin and thick unstiffened and\u0000stiffened shells with arbitrary boundary conditions. In addition, the axial load and external pressure is applied to\u0000the shell as a ratio of the global buckling load and pressure. This study demonstrates the accuracy, stability, and the\u0000fast rate of convergence of the present method, for the buckling and vibration analyses of stiffened conical shells.\u0000The presented results are compared with those of other shell theories and a special case where the angle of conical\u0000shell approaches zero, i.e. a cylindrical shell, and excellent agreements are achieved.","PeriodicalId":227331,"journal":{"name":"June 2019","volume":"135 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122495320","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Lamb Waves Topological Imaging of Multiple Blind Defects in an Isotropic Plate 各向同性板中多盲缺陷的Lamb波拓扑成像

June 2019 Pub Date : 2019-06-01 DOI: 10.20855/IJAV.2019.24.21479

Wenfa Zhu, Haiyan Zhang, Mengling Xu, Guopeng Fan

{"title":"Lamb Waves Topological Imaging of Multiple Blind Defects in an Isotropic Plate","authors":"Wenfa Zhu, Haiyan Zhang, Mengling Xu, Guopeng Fan","doi":"10.20855/IJAV.2019.24.21479","DOIUrl":"https://doi.org/10.20855/IJAV.2019.24.21479","url":null,"abstract":"The study investigates the feasibility of the Lamb wave topological imaging method for detecting multiple blindholes in an isotropic plate. The topological imaging method is performed based on the computations of two\u0000wave fields, a forward and an adjoint, in the defect-free reference medium using different emitting sources. The\u0000image is computed by multiplying the forward and adjoint wave fields together and integrating them over time or\u0000frequency. The interferences of multimode aliasing and the scattering effect can thus be eliminated at the defectfree positions with an improved image resolution. To investigate the physical mechanism, the refocusing process of\u0000the multimode Lamb waves at the defect positions is presented by a face-to-face comparison between the snapshots\u0000of the forward and adjoint wave fields using the finite element simulation. The Lamb wave topological imaging\u0000method is numerically and experimentally verified to identify multiple blind-holes in an isotropic aluminium plate.\u0000The results demonstrate that the topological imaging method enables the suppression of the sartefacts resulting\u0000from the mode conversion and achieve high-resolution imaging of the blind defects","PeriodicalId":227331,"journal":{"name":"June 2019","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122589525","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Stability Analysis of a Tapered Symmetric Sandwich Beam Resting on a Variable Pasternak Foundation 基于变帕斯捷尔纳克地基的锥形对称夹层梁稳定性分析

June 2019 Pub Date : 2019-06-01 DOI: 10.20855/IJAV.2019.24.21178

M. Pradhan, P. Dash, M. K. Mishra, P. Pradhan

{"title":"Stability Analysis of a Tapered Symmetric Sandwich Beam Resting on a Variable Pasternak Foundation","authors":"M. Pradhan, P. Dash, M. K. Mishra, P. Pradhan","doi":"10.20855/IJAV.2019.24.21178","DOIUrl":"https://doi.org/10.20855/IJAV.2019.24.21178","url":null,"abstract":"The static and dynamic stability analysis of a three-layered, tapered and symmetric sandwich beam resting on a\u0000variable Pasternak foundation and undergoing a periodic axial load has been carried out for two different boundary\u0000conditions by using a computational method. The governing equation of motion has been derived by using Hamilton’s principle along with generalized Galerkin’s method. The effects of elastic foundation parameter, core-loss\u0000factor, the ratio of length of the beam to the thickness of the elastic layer, the ratio of thickness of shear-layer of\u0000Pasternak foundation to the length of the beam, different modulus ratios, taper parameter, core thickness parameter,\u0000core-density parameter and geometric parameter on the non-dimensional static buckling load and on the regions of\u0000parametric instability are studied. This type of study will help the designers to achieve a system with high strength\u0000to weight ratio and better stability which are the desirable parameters for many modern engineering applications,\u0000such as in the attitude stability of spinning satellites, stability of helicopter components, stability of space vehicles\u0000etc.","PeriodicalId":227331,"journal":{"name":"June 2019","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116110914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Unbalanced Vibration Response Reduction of Rotor Using Active Magnetic Actuator Based on PD Control 基于PD控制的主动磁致动器转子非平衡振动响应抑制

June 2019 Pub Date : 2019-06-01 DOI: 10.20855/IJAV.2019.24.21517

Jianfei Yao, Jia-Bao Dai, Liang Liu

引用次数: 2

Optimum Tuning of a Gyroscopic Vibration Absorber for Vibration Control of a Vertical Cantilever Beam with Tip Mass 陀螺式吸振器的最优调谐对具有尖端质量的垂直悬臂梁的振动控制

June 2019 Pub Date : 2019-06-01 DOI: 10.20855/IJAV.2019.24.21158

Faruk Unker, O. Çuvalci

引用次数: 6

Do Sound Segments Contribute to Sounding Charismatic? Evidence from a Case Study of Steve Jobs' and Mark Zuckerberg's Vowel Spaces 声音片段有助于听起来有魅力吗?史蒂夫·乔布斯和马克·扎克伯格元音空间案例研究的证据

June 2019 Pub Date : 2019-03-01 DOI: 10.20855/IJAV.2019.24.21531

Oliver Niebuhr, S. Gonzalez

引用次数: 13