The Shock and Vibration Digest最新文献_第2页

Survey on modal frequencies of centrifugally stiffened beams 离心加筋梁模态频率的研究

The Shock and Vibration Digest Pub Date : 2005-11-01 DOI: 10.1177/0583102405056752

A. Bazoune

引用次数: 24

Wavelets : Theoretical concepts and vibrations related applications 小波:理论概念和与振动有关的应用

The Shock and Vibration Digest Pub Date : 2005-09-01 DOI: 10.1177/0583102405055441

P. Spanos, G. Failla

引用次数: 49

A review of the experimental estimation of the rotor dynamic parameters of seals 密封转子动态参数的实验估计综述

The Shock and Vibration Digest Pub Date : 2005-07-01 DOI: 10.1177/0583102405055442

R. Tiwari, S. Manikandan, S. K. Dwivedy

引用次数: 33

Considerations on the Field Balancing of the Overhung Rigid Rotors 悬挑刚性转子现场平衡问题的思考

The Shock and Vibration Digest Pub Date : 2005-05-01 DOI: 10.1177/0583102405054497

J. A. Méndez-Adriani

{"title":"Considerations on the Field Balancing of the Overhung Rigid Rotors","authors":"J. A. Méndez-Adriani","doi":"10.1177/0583102405054497","DOIUrl":"https://doi.org/10.1177/0583102405054497","url":null,"abstract":"Any unbalance distribution in a rigid rotor assembly can be completely balanced by fixing at a determined radius two correction weights (equal and opposite to the equivalent unbalance weights), each one located in any two planes perpendicular to the rotation axis. This paper presents a tutorial that develops, in a simple, clear, concise, and precise form, the general equations that relate the unbalance weights in the correction planes with the vibrations in the supporting bearings, based on the concept of the mechanical impedance, for the particular case of an overhung rigid rotor. Important insights are provided to understand thoroughly the inherent additional cross-effect that is produced by the application of each of the existing exact methods of influence coefficients to the balancing of the overhung rigid rotors. Also discussed is a recent advance that consists of a new solution for the field balancing of the overhung rigid rotors. This alternative solution again combines the least cross-effect with the minimum number for the trial weights, and gives the correction weights directly for both balancing planes. The advantage of this new technique, with respect to the previous variation of the method of the influence coefficients, is that its implementation in any industrial balancer would require only minor changes in the programming. An explanation of the conversion that is necessary for different phase conventions within a computer program and examples of calculations with experimental data are included for completeness.","PeriodicalId":405331,"journal":{"name":"The Shock and Vibration Digest","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125685478","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: 4

Embedded non-destructive evaluation for structural health monitoring, damage detection, and failure prevention 用于结构健康监测、损伤检测和故障预防的嵌入式非破坏性评估

The Shock and Vibration Digest Pub Date : 2005-03-01 DOI: 10.1177/0583102405052561

V. Giurgiutiu, A. Cuc

{"title":"Embedded non-destructive evaluation for structural health monitoring, damage detection, and failure prevention","authors":"V. Giurgiutiu, A. Cuc","doi":"10.1177/0583102405052561","DOIUrl":"https://doi.org/10.1177/0583102405052561","url":null,"abstract":"In this paper we review the state of the art in an emerging new technology: embedded ultrasonic non-destructive evaluation (NDE). Embedded ultrasonic NDE permits active structural health monitoring, i.e. the on-demand interrogation of the structure to determine its current state of structural health. The enabling element of embedded ultrasonic NDE is the piezoelectric wafer active sensor (PWAS). We begin by reviewing the guided wave theory in plate, tube, and shell structures, with special attention to Lamb waves. The mechanisms of Lamb wave excitation and detection with embeddable PWAS transducers is presented. It is shown analytically and verified experimentally that Lamb wave mode tuning can be achieved by the judicious combination of PWAS dimensions, frequency value, and Lamb mode characteristics. Subsequently, we address in turn the use of pitch-catch, pulse-echo, and phased array ultrasonic methods for Lambwave damage detection. In each case, the conventional ultrasonic NDE results are contrasted with embedded NDE results. Detection of cracks, disbonds, delaminations, and diffuse damage in metallic and composite structures are exemplified. Other techniques, such as the time reversal method and the migration technique, are also presented. The paper ends with conclusions and suggestions for further work.","PeriodicalId":405331,"journal":{"name":"The Shock and Vibration Digest","volume":"815 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121494319","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: 255

Eddy Current Damping in Structures 结构中的涡流阻尼

The Shock and Vibration Digest Pub Date : 2004-11-01 DOI: 10.1177/0583102404048517

H. Sodano, J. Bae

{"title":"Eddy Current Damping in Structures","authors":"H. Sodano, J. Bae","doi":"10.1177/0583102404048517","DOIUrl":"https://doi.org/10.1177/0583102404048517","url":null,"abstract":"When a conductive material is subjected to a time-varying magnetic flux, eddy currents are generated in the conductor. These eddy currents circulate inside the con- ductor generating a magnetic field of opposite polarity as the applied magnetic field. The interaction of the two magnetic fields causes a force that resists the change in magnetic flux. However, due to the internal resistance of the conductive material, the eddy currents will be dissipated into heat and the force will die out. As the eddy currents are dissipated, energy is removed from the system, thus producing a damp- ing effect. There are several different methods of inducing a time-varying magnetic field, and from each method arises the potential for a different type of damping system. There- fore, the research into eddy current and magnetic damping mechanisms has led to a diverse range of dampers, many of which are detailed in this paper. The majority of the research in eddy current damping has taken place in the area of mag- netic braking. A second topic that has received significant interest is the use of eddy current dampers for the suppres- sion of structural vibrations. However, much of this research is not concentrated in one area, but has been applied to a variety of different structural systems in a number of distinct ways. In this paper, we review the research into various types of eddy current damping mechanisms and we discuss the future of eddy currents with some potential uses that have not yet been studied.","PeriodicalId":405331,"journal":{"name":"The Shock and Vibration Digest","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121392266","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: 123

A Review of the Vibrations of Plates and Shells 板壳振动研究进展

The Shock and Vibration Digest Pub Date : 2004-09-01 DOI: 10.1177/0583102404045575

Khaled A. Alhazza, A. Al-Hazza

引用次数: 25

A close examination of high-frequency residual terms trends 高频剩余项趋势的仔细检查

The Shock and Vibration Digest Pub Date : 2004-09-01 DOI: 10.1177/0583102404045704

M. Duarte

引用次数: 0

Cracked shaft detection and diagnostics: A literature review 裂纹轴的检测和诊断:文献综述

The Shock and Vibration Digest Pub Date : 2004-07-01 DOI: 10.1177/0583102404045439

Giridhar Sabnavis, R. G. Kirk, M. Kasarda, D. Quinn

引用次数: 193

A Review of Power Harvesting from Vibration using Piezoelectric Materials 压电材料振动能量收集研究进展

The Shock and Vibration Digest Pub Date : 2004-05-01 DOI: 10.1177/0583102404043275

H. Sodano, D. Inman, G. Park

{"title":"A Review of Power Harvesting from Vibration using Piezoelectric Materials","authors":"H. Sodano, D. Inman, G. Park","doi":"10.1177/0583102404043275","DOIUrl":"https://doi.org/10.1177/0583102404043275","url":null,"abstract":"The process of acquiring the energy surrounding a system and converting it into usable electrical energy is termed power harvesting. In the last few years, there has been a surge of research in the area of power harvesting. This increase in research has been brought on by the modern advances in wireless technology and low-power electronics such as microelectromechanical systems. The advances have allowed numerous doors to open for power harvesting systems in practical real-world applications. The use of piezoelectric materials to capitalize on the ambient vibrations surrounding a system is one method that has seen a dramatic rise in use for power harvesting. Piezoelectric materials have a crystalline structure that provides them with the ability to transform mechanical strain energy into electrical charge and, vice versa, to convert an applied electrical potential into mechanical strain. This property provides these materials with the ability to absorb mechanical energy from their surroundings, usually ambient vibration, and transform it into electrical energy that can be used to power other devices. While piezoelectric materials are the major method of harvesting energy, other methods do exist; for example, one of the conventional methods is the use of electromagnetic devices. In this paper we discuss the research that has been performed in the area of power harvesting, and the future goals that must be achieved for power harvesting systems to find their way into everyday use.","PeriodicalId":405331,"journal":{"name":"The Shock and Vibration Digest","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114031267","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: 1405