Volume 11: Acoustics, Vibration, and Phononics最新文献_第4页

Objective Evaluation of FCV Interior Sound Quality During Acceleration 目的评价FCV加速过程的车内音质

Volume 11: Acoustics, Vibration, and Phononics Pub Date : 2018-11-09 DOI: 10.1115/IMECE2018-87011

Hai Liu, Yanyi Zhang, Dong Hao, Yong Chen, Xiangying Ji, Changyin Wei

引用次数: 1

Different Definitions of Entropy for Statistical Energy Analysis 统计能量分析中熵的不同定义

Volume 11: Acoustics, Vibration, and Phononics Pub Date : 2018-11-09 DOI: 10.1115/IMECE2018-87240

Z. Sotoudeh

引用次数: 0

Deep Convolutional Neural Network for Early Disk Crack Diagnosis Under Variable Speed 基于深度卷积神经网络的变转速磁盘早期裂纹诊断

Volume 11: Acoustics, Vibration, and Phononics Pub Date : 2018-11-09 DOI: 10.1115/IMECE2018-87247

Ruonan Liu, Ruqiang Yan, Meng Ma, Xuefeng Chen

{"title":"Deep Convolutional Neural Network for Early Disk Crack Diagnosis Under Variable Speed","authors":"Ruonan Liu, Ruqiang Yan, Meng Ma, Xuefeng Chen","doi":"10.1115/IMECE2018-87247","DOIUrl":"https://doi.org/10.1115/IMECE2018-87247","url":null,"abstract":"Aero engine is essentially the heart of an airplane. However, the high temperature and high pressure working environment of the aero engine can easily lead to fatigue cracks in turbine disks, and result in serious accidents. Therefore, early disk crack diagnosis is very important to guarantee safe flight of the airplane and reduce its maintenance cost, which, however, is challenging due to the difficulty in building a complex physical model under variable operating speeds. To tackle this problem, a novel deep convolutional neural network (CNN)-based method is proposed for early disk crack diagnosis. CNN, as one of the deep learning structures, can learn deep-seated features directly and automatically from the raw data without the need of physical model or prior knowledge. It shows the potential to deal with the challenge of early disk crack diagnosis. Since the proposed diagnosis method is signal-level, the collected vibration signals can be input into the CNN architecture directly without the need of feature extractor. In this paper, the vibration signals at both the beginning and the end of the test are used for training the CNN model, then the rest signals are input into the trained model as test data to diagnose when the incipient disk crack is generated. Experimental study conducted on the fatigue test of a real turbine disk has proved the effectiveness and robustness of the proposed method for early disk crack diagnosis. Meanwhile, comparison study with some state-of-the-art methods is also performed, and further highlights the superiority of the proposed method.","PeriodicalId":197121,"journal":{"name":"Volume 11: Acoustics, Vibration, and Phononics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123119378","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

On the Free Vibration Analysis of a Sandwich Beam With Tip Mass 具有尖端质量的夹层梁的自由振动分析

Volume 11: Acoustics, Vibration, and Phononics Pub Date : 2018-11-09 DOI: 10.1115/IMECE2018-87535

E. F. Joubaneh, O. Barry

引用次数: 1

Design of Acoustic Metamaterials Using Gradient Based Optimization 基于梯度优化的声学超材料设计

Volume 11: Acoustics, Vibration, and Phononics Pub Date : 2018-11-09 DOI: 10.1115/IMECE2018-88254

Feruza A. Amirkulova, A. Norris

引用次数: 0

Research on the Weak Signal Detection of Bearing Fault Based on Duffing Oscillator 基于Duffing振荡器的轴承故障微弱信号检测研究

Volume 11: Acoustics, Vibration, and Phononics Pub Date : 2018-11-09 DOI: 10.1115/IMECE2018-86892

Hao Long, Dan Liu, Fei Liu, Qingxin Wang, Lin Liang, Guanghua Xu

引用次数: 1

Modeling the Wind Turbine Profiles Assuring the Maximum Lift Force With Low-Noise Operation for Variable Wind Velocities 可变风速下保证最大升力和低噪声运行的风力机廓线建模

Volume 11: Acoustics, Vibration, and Phononics Pub Date : 2018-11-09 DOI: 10.1115/IMECE2018-86795

V. Radulescu

{"title":"Modeling the Wind Turbine Profiles Assuring the Maximum Lift Force With Low-Noise Operation for Variable Wind Velocities","authors":"V. Radulescu","doi":"10.1115/IMECE2018-86795","DOIUrl":"https://doi.org/10.1115/IMECE2018-86795","url":null,"abstract":"The paper presents a new solution for the wind turbine profile shape modeling based on the concept of the maximum lift force, capable to be produced at different values of the wind velocities. The profile is designed and realized in accordance with the new concept emerged in the last decade, on the operation of the wind turbines with maximum lifting force. The purpose is to provide a low-noise during operation because a negative effect on the medium and long-term operation of the wind turbines (wind farms) is the noise that affects the flight of birds, terrestrial animal life, and especially human communities. Various sources generate independent acoustic emissions on wind profiles, such as the turbulent flow, the interaction of the turbulent boundary layer area of the trailing edge, the flow separation, and the boundary layer separation of vortices formed in the zone of the trailing edge. There is also considered the influence of the apparent wind on the incidence variation of the profile. In order to maintain an optimum angle of attack relative to the wind velocity, a fixed blade inclination must increase its speed to be proportional to the wind. Thus, to maximize the aerodynamic performance, the rotor must spin faster when the wind intensity increases. Measurement of the acoustic signal requires electronic devices that operate on electric signals obtained from the conversion of the pressure variations in voltage or variations in electrical current. The noise caused by the turbulent flow is generated primarily by the sharply pointed leading edge and cannot be diminished. There are presented some numerical results correlated with the measurements made in the field.","PeriodicalId":197121,"journal":{"name":"Volume 11: Acoustics, Vibration, and Phononics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124334220","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

The Study of Holey Cavity in the Application of Thermoacoustics Imaging 空穴在热声成像中的应用研究

Volume 11: Acoustics, Vibration, and Phononics Pub Date : 2018-11-09 DOI: 10.1115/IMECE2018-87757

Chang Liu, Ashkan Ghanbarzadeh-Dagheyan, J. Heredia-Juesas, A. Molaei, J. Martinez-Lorenzo

{"title":"The Study of Holey Cavity in the Application of Thermoacoustics Imaging","authors":"Chang Liu, Ashkan Ghanbarzadeh-Dagheyan, J. Heredia-Juesas, A. Molaei, J. Martinez-Lorenzo","doi":"10.1115/IMECE2018-87757","DOIUrl":"https://doi.org/10.1115/IMECE2018-87757","url":null,"abstract":"Microwave-induced Thermoacoustics (TA) sensing has the potential to be a breakthrough in subsurface imaging applications. This is because it combines the advantages of high contrast of microwave imaging and high resolution of ultrasound imaging. However, state-of-the-art TA hardware requires that the receiving transducer is scanned in a linear or rotational fashion in order to be able to collect enough orthogonal data needed to produce a TA image possessing high-spatial resolution both in range and cross-range. This process is slow, increases the detection time, and adds an extra complexity to the system. In order to address these problems, a Compressive Sensing (CS) methodology is presented in this paper as a mechanism to reduce the minimum number of data samples required to reconstruct a sparse signal. Furthermore, in order to reduce the mutual information shared by different measurements, a holey cavity structure is proposed to be used to perform 4D coding. In this work, the TA imaging theory is introduced; and the impact that the holey cavity parameters have in the imaging performance is studied. The imaging results in this work are carried out using a distributed Alternating Direction Method of Multipliers (ADMM) algorithm, capable of using norm-1 and norm-2 regularizers; and they reveal the effectiveness of the proposed holey-cavity and CS TA imaging approach.","PeriodicalId":197121,"journal":{"name":"Volume 11: Acoustics, Vibration, and Phononics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129106631","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

Active Acoustic Metamaterials With Programmable Densities Using an H-∞ Controller 基于H-∞控制器的可编程密度有源声学超材料

Volume 11: Acoustics, Vibration, and Phononics Pub Date : 2018-11-09 DOI: 10.1115/IMECE2018-87749

A. Baz

{"title":"Active Acoustic Metamaterials With Programmable Densities Using an H-∞ Controller","authors":"A. Baz","doi":"10.1115/IMECE2018-87749","DOIUrl":"https://doi.org/10.1115/IMECE2018-87749","url":null,"abstract":"Various types of acoustic metamaterials have been developed to control the flow of acoustical energy through these materials. Most of these metamaterials are passive in nature with pre-tuned and fixed material properties. In this paper, the emphasis is placed on the development of a class of one-dimensional acoustic metamaterials with programmable densities in order to enable the control the acoustic wave propagation in these media. With such unique capabilities, the proposed active acoustic metamaterials (AAMM) can be utilized to physically realize, for example, acoustic cloaks, wave shifters and focusers, tunable acoustic absorbers and reflectors, as well as non-reciprocal acoustic media.\u0000 The theoretical analysis of this class of AAMM with programmable effective dynamical densities is presented for an array of cavities separated by piezoelectric boundaries. These boundaries provide means for controlling the stiffness of the individual cavity and, in turn, its dynamical densities. In this regard, a disturbance rejection strategy is considered which is based on an H-∞ robust controller. The time and frequency response characteristics of a unit cell of the AAMM are investigated for various parameters of the controller in an attempt to optimize the performance characteristics.\u0000 Extension of this study to include active control capabilities of the bulk modulus of the metamaterials would enable the development of wide classes of AAMM that are only limited by our imagination.","PeriodicalId":197121,"journal":{"name":"Volume 11: Acoustics, Vibration, and Phononics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132063218","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

Detection of Misfire in a Six-Cylinder Diesel Engine Using Acoustic Emission Signals 利用声发射信号检测六缸柴油机失火

Volume 11: Acoustics, Vibration, and Phononics Pub Date : 2018-11-01 DOI: 10.1115/IMECE2018-86506

M. Jafari, P. Borghesani, P. Verma, Ashkan Eslaminejad, Z. Ristovski, Richard J. Brown

引用次数: 2