Advances in Acoustics and Vibration最新文献_第10页

Experimental Analysis of a Piezoelectric Energy Harvesting System for Harmonic, Random, and Sine on Random Vibration 压电谐振、随机、正弦随机振动能量收集系统的实验分析

Advances in Acoustics and Vibration Pub Date : 2013-08-04 DOI: 10.1155/2013/241025

Jackson W. Cryns, B. Hatchell, Emiliano Santiago-Rojas, K. Silvers

{"title":"Experimental Analysis of a Piezoelectric Energy Harvesting System for Harmonic, Random, and Sine on Random Vibration","authors":"Jackson W. Cryns, B. Hatchell, Emiliano Santiago-Rojas, K. Silvers","doi":"10.1155/2013/241025","DOIUrl":"https://doi.org/10.1155/2013/241025","url":null,"abstract":"Harvesting power with a piezoelectric vibration powered generator using a full-wave rectifier conditioning circuit is experimentally compared for varying sinusoidal, random, and sine on random (SOR) input vibration scenarios; the implications of source vibration characteristics on harvester design are discussed. The rise in popularity of harvesting energy from ambient vibrations has made compact, energy dense piezoelectric generators commercially available. Much of the available literature focuses on maximizing harvested power through nonlinear processing circuits that require accurate knowledge of generator internal mechanical and electrical characteristics and idealization of the input vibration source, which cannot be assumed in general application. Variations in source vibration and load resistance are explored for a commercially available piezoelectric generator. The results agree with numerical and theoretical predictions in the previous literature for optimal power harvesting in sinusoidal and flat broadband vibration scenarios. Going beyond idealized steady-state sinusoidal and flat random vibration input, experimental SOR testing allows for more accurate representation of real world ambient vibration. It is shown that characteristic interactions from more complex vibration sources significantly alter power generation and processing requirements by varying harvested power, shifting optimal conditioning impedance, inducing voltage fluctuations, and ultimately rendering idealized sinusoidal and random analyses incorrect.","PeriodicalId":44068,"journal":{"name":"Advances in Acoustics and Vibration","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2013/241025","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64394675","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: 21

Dynamic Stability of Plane Free Surface of Liquid in Axisymmetric Tanks 轴对称罐内液体平面自由表面的动态稳定性

Advances in Acoustics and Vibration Pub Date : 2013-07-28 DOI: 10.1155/2013/298458

S. S. Kolukula, P. Chellapandi

引用次数: 4

A Crack Identification Method for Bridge Type Structures under Vehicular Load Using Wavelet Transform and Particle Swarm Optimization 基于小波变换和粒子群优化的车用桥梁结构裂纹识别方法

Advances in Acoustics and Vibration Pub Date : 2013-06-15 DOI: 10.1155/2013/634217

Hakan Gökdağ

引用次数: 2

Petroleum Pumps’ Current and Vibration Signatures Analysis Using Wavelet Coherence Technique 基于小波相干技术的石油泵电流和振动特征分析

Advances in Acoustics and Vibration Pub Date : 2013-06-12 DOI: 10.1155/2013/659650

R. Shnibha, A. Albarbar

{"title":"Petroleum Pumps’ Current and Vibration Signatures Analysis Using Wavelet Coherence Technique","authors":"R. Shnibha, A. Albarbar","doi":"10.1155/2013/659650","DOIUrl":"https://doi.org/10.1155/2013/659650","url":null,"abstract":"Vibration analysis is widely used for rotating machinery diagnostics; however measuring vibration of operational oil well pumps is not possible. The pump’s driver’s current signatures may provide condition-related information without the need for an access to the pump itself. This paper investigates the degree of relationship between the pump’s driver’s current signatures and its induced vibration. This relationship between the driver’s current signatures (DCS) and its vibration signatures (DVS) is studied by calculating magnitude-squared coherence and phase coherence parameters at a certain frequency band using continuous wavelet transform (CWT). The CWT coherence-based technique allows better analysis of temporal evolution of the frequency content of dynamic signals and areas in the time-frequency plane where the two signals exhibit common power or consistent phase behaviour indicating a relationship between the signals. This novel approach is validated by experimental data acquired from 3 kW petroleum pump’s driver. Both vibration and current signatures were acquired under different speed and load conditions. The outcomes of this research suggest the use of DCS analysis as reliable and inexpensive condition monitoring tool, which could be implemented for oil pumps, real-time monitoring associated with condition-based maintenance (CBM) program.","PeriodicalId":44068,"journal":{"name":"Advances in Acoustics and Vibration","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2013/659650","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64197798","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

Estimation of Acceleration Amplitude of Vehicle by Back Propagation Neural Networks 基于反向传播神经网络的车辆加速度幅值估计

Advances in Acoustics and Vibration Pub Date : 2013-06-04 DOI: 10.1155/2013/614025

M. Heidari, H. Homaei

引用次数: 7

Determination of the Fundamental Frequency of Perforated Rectangular Plates: Concentrated Negative Mass Approach for the Perforation 矩形穿孔板基频的测定:穿孔的集中负质量法

Advances in Acoustics and Vibration Pub Date : 2013-05-30 DOI: 10.1155/2013/972409

K. Mali, P. Singru

引用次数: 12

Experiments on the Use of Signal Visualization Technique for In-Service Stall Detection in Industrial Fans 信号可视化技术在工业风机失速检测中的应用实验

Advances in Acoustics and Vibration Pub Date : 2013-05-07 DOI: 10.1155/2013/610407

S. Bianchi, A. Corsini, A. G. Sheard

引用次数: 6

Finite Element Formulation for Stability and Free Vibration Analysis of Timoshenko Beam Timoshenko梁稳定性和自由振动分析的有限元公式

Advances in Acoustics and Vibration Pub Date : 2013-04-18 DOI: 10.1155/2013/841215

Abbas Moallemi-Oreh, M. Karkon

引用次数: 9

Large-Eddy Simulation of the Aerodynamic and Aeroacoustic Performance of a Ventilation Fan 通风机气动与声学性能的大涡模拟

Advances in Acoustics and Vibration Pub Date : 2013-03-27 DOI: 10.1155/2013/876973

S. Bianchi, D. Borello, A. Corsini, F. Rispoli, A. G. Sheard

{"title":"Large-Eddy Simulation of the Aerodynamic and Aeroacoustic Performance of a Ventilation Fan","authors":"S. Bianchi, D. Borello, A. Corsini, F. Rispoli, A. G. Sheard","doi":"10.1155/2013/876973","DOIUrl":"https://doi.org/10.1155/2013/876973","url":null,"abstract":"There are controversial requirements involved in developing numerical methodologies in order to compute the flow in industrial fans. The full resolution of turbulence spectrum in such high-Reynolds number flow configurations entails unreasonably expensive computational costs. The authors applied the study to a large unidirectional axial flow fan unit for tunnel ventilation to operate in the forward direction under ambient conditions. This delivered cooling air to the tunnel under routine operation, or hot gases at 400∘C under emergency conditions in the event of a tunnel fire. The simulations were carried out using the open source code OpenFOAM, within which they implemented a very large eddy simulation (VLES) based on one-equation SGS model to solve a transport equation for the modelled (subgrid) turbulent kinetic energy. This subgrid turbulence model improvement is a remedial strategy in VLES of high-Reynolds number industrial flows which are able to tackle the turbulence spectrum’s well-known insufficient resolution. The VLES of the industrial fan permits detecting the unsteady topology of the rotor flow. This paper explores the evolution of secondary flow phenomena and speculates on its influence on the actual load capability when operating at peak-pressure condition. Predicted noise emissions, in terms of sound pressure level spectra, are also compared with experimental results and found to agree within the uncertainty of the measurements.","PeriodicalId":44068,"journal":{"name":"Advances in Acoustics and Vibration","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2013/876973","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64298187","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: 1

Side Branch Interaction with Main Line Standing Waves and Related Signal Handling Approaches 侧支路与主线驻波的相互作用及相关信号处理方法

Advances in Acoustics and Vibration Pub Date : 2013-03-24 DOI: 10.1155/2013/487141

A. Ruggles, E. Moore, Michael Shehane

引用次数: 0