Journal of Vibration and Acoustics: Recent submissions
Now showing items 521-540 of 3913
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The Oscillation Attenuation of an Accelerating Jeffcott Rotor Damped by Magnetorheological Dampers Affected by the Delayed Yielding Phenomenon in the Lubricating Oil
(The American Society of Mechanical Engineers (ASME), 2018)Adding damping devices to the rotor supports is a frequently used technological solution for reducing vibrations of rotating machines. To achieve their optimum performance, their damping effect must be adaptable to the ... -
Transient Analysis of a Flexible Pin-on-Disk System and Its Application to the Research Into Time-Varying Squeal
(The American Society of Mechanical Engineers (ASME), 2018)In this paper, a flexible pin-on-disk system is used to simulate how squeal noise can be generated in frictional contact. As the research object, the modeling process and transient simulation method of the flexible pin-on-disk ... -
Vibration Control of a Floating Raft System by Synchrophasing of Electrical Machines: An Experimental Study
(The American Society of Mechanical Engineers (ASME), 2018)This paper describes an experimental investigation into the vibration control of multiple electrical machines installed on a large-scale floating raft system. Vibration transmission to a flexible hull-like structure that ... -
Experimental Nonlinear Model Identification of a Highly Nonlinear Resonator
(The American Society of Mechanical Engineers (ASME), 2018)In this work, two model identification methods are used to estimate the nonlinear large deformation behavior of a nonlinear resonator in the time and frequency domains. A doubly clamped beam with a slender geometry carrying ... -
Dynamic Responses of a Four-Span Continuous Plate Structure Subjected to Moving Cars With Time-Varying Speeds
(The American Society of Mechanical Engineers (ASME), 2018)This paper presents an experimental and theoretical study of vibration of a four-span continuous plate with two rails on top and four extra supports excited by one or two moving model cars, which is meant to represent ... -
Mechanism of Fast Time-Varying Vibration for Rotor–Stator Contact System: With Application to Fault Diagnosis
(The American Society of Mechanical Engineers (ASME), 2018)Fast time-varying (FTV) phenomena, such as significant speed changes, FTV stiffness, and vibration signals with fast-oscillated instantaneous frequency (IF), carry critical fault information of high-speed rotating machines. ... -
Denoising Weighting Beamforming Method Applied to Sound Source Localization With Airflow Using Microphone Array
(The American Society of Mechanical Engineers (ASME), 2018)Conventional frequency domain beamforming (FDBF) relies on the measured cross-spectral matrix (CSM). However, in wind tunnel tests, the CSM diagonal is contaminated by the interference of incoherent noise after long-time ... -
A New Global Spatial Discretization Method for Calculating Dynamic Responses of Two-Dimensional Continuous Systems With Application to a Rectangular Kirchhoff Plate
(The American Society of Mechanical Engineers (ASME), 2018)A new global spatial discretization method (NGSDM) is developed to accurately calculate natural frequencies and dynamic responses of two-dimensional (2D) continuous systems such as membranes and Kirchhoff plates. The ... -
First-Crossing Problem of Weakly Coupled Strongly Nonlinear Oscillators Subject to a Weak Harmonic Excitation and Gaussian White Noises
(The American Society of Mechanical Engineers (ASME), 2018)We study first-crossing problem of two-degrees-of-freedom (2DOF) strongly nonlinear mechanical oscillators analytically. The excitation is the combination of a deterministic harmonic function and Gaussian white noises ... -
Acoustic Metamaterial With Fractal Coiling Up Space for Sound Blocking in a Deep Subwavelength Scale
(The American Society of Mechanical Engineers (ASME), 2018)Inspired by fractal photonic/phononic crystals, the self-similar fractal technique is applied to design acoustic metamaterial. By replacing the straight channel of coiling up space with a smaller coiling up space, a class ... -
A Detection Method for Friction Vibration Based on Harmonic Wavelet Packet Transform and Cross-Correlation Analysis
(The American Society of Mechanical Engineers (ASME), 2018) -
A Practical Estimation of Frequency Response Functions for System Decoupling Indirectly Using a Variable Cross Section Rod
(The American Society of Mechanical Engineers (ASME), 2018)It is of high importance to be able to decouple a system to obtain the dynamic characteristics of its substructures; however, the necessary frequency response functions (FRFs) of the coupling interface are usually challenging ... -
Feedforward Feedback Linearization Linear Quadratic Gaussian With Loop Transfer Recovery Control of Piezoelectric Actuator in Active Vibration Isolation System
(The American Society of Mechanical Engineers (ASME), 2018)Hysteresis exists widely in intelligent materials, such as piezoelectric and giant magnetostrictive ones, and it significantly affects the precision of vibration control when a controlled object moves at a range of micrometers ... -
Study on Vibration Characteristics of Fan Shaft of Geared Turbofan Engine With Sudden Imbalance Caused by Blade Off
(The American Society of Mechanical Engineers (ASME), 2018)Based on the requirements of the dynamic design of geared turbofan (GTF) engines, the vibration characteristic of the fan shaft is investigated. The effect of sudden imbalance caused by blade off, the time-varying meshing ... -
Trailing Edge Perforation for Interaction Tonal Noise Reduction of a Contra-Rotating Fan
(The American Society of Mechanical Engineers (ASME), 2018)This study focuses on a passive noise abatement technique in a small contra-rotating fan, aiming at reducing the interaction noise between the two rotors through porous trailing edge (TE) treatment to the forward rotor. A ... -
An Improved Technique for Measuring the Vibration Sensitivity of Subminiature Microphones
(The American Society of Mechanical Engineers (ASME), 2018)Presented is a test methodology for characterizing the vibration sensitivity of miniature microphones. An ordinary vibration sensitivity experiment becomes difficult because vibrating surfaces are also sources of sound. ... -
Entropy for Strongly Coupled Oscillators
(The American Society of Mechanical Engineers (ASME), 2018)This paper examines an approach for determining the entropy of coupled oscillators that does not rely on the assumption of weak coupling. The results of this approach are compared to the results for a weakly coupled system. ... -
Generalized Bilinear Amplitude Approximation and X-Xr for Modeling Cyclically Symmetric Structures With Cracks
(The American Society of Mechanical Engineers (ASME), 2018)The analysis of the influence of cracks on the dynamics of bladed disks is critical for design, failure prognosis, and structural health monitoring. Predicting the dynamics of cracked bladed disks is computationally ... -
On Improvement of the Frequency Bandwidth of Nonlinear Vibration Energy Harvesters Using a Mechanical Motion Rectifier
(The American Society of Mechanical Engineers (ASME), 2018)This paper presents a broadband vibration energy harvester (VEH) which consists of a monostable Duffing oscillator connected to an electromagnetic generator via a mechanical motion rectifier. The mechanical motion rectifier ... -
Voltage-Induced Snap-Through of an Asymmetrically Laminated, Piezoelectric, Thin-Film Diaphragm Micro-Actuator—Part 2: Numerical and Analytical Results
(The American Society of Mechanical Engineers (ASME), 2018)In Part 2 of the two-paper series, the asymmetrically laminated piezoelectric shell subjected to distributed bias voltage as modeled in Part 1 is analytically and numerically investigated. Three out-of-plane degrees-of-freedom ...