Journal of Low Frequency Noise Vibration and Active Control (J LOW FREQ NOISE V A)

Publisher: Multi-Science Publishing

Journal description

The considerable and growing interest in the phenomena of low frequency noise and vibration and their powerful effects on man, animals and the environment, spreads across several disciplines; studies of these topics are to be found at present in the periodical literature of acoustics, geophysics, architecture, civil and mechanical engineering, psychology and zoology.This quarterly journal brings together material which otherwise would be scattered: the journal is the cornerstone of the creation of a unified corpus of knowledge on the subject. Among the topics covered by the journal are: sources of infrasound and low frequency noise and vibration: detection, measurement and anlysis; propagation of infrasound and low frequency noise in the atmospere; propagation of vibration in the ground and in structures; perception of infrasound, low frequency noise and vibration by man and animals; effects on man and animals; interaction of low frequency noise and vibration: vibrations caused by noise, radiation of noise from vibrating structures; low frequency noise and vibration control: problems and solutions.

Current impact factor: 0.41

Impact Factor Rankings

2016 Impact Factor Available summer 2017
2014 / 2015 Impact Factor 0.409
2013 Impact Factor 0.263
2012 Impact Factor 0.214
2011 Impact Factor 0.214
2010 Impact Factor 0.25
2009 Impact Factor 0.279
2008 Impact Factor 0.227
2007 Impact Factor 0.098
2006 Impact Factor 0.171
2005 Impact Factor 0.195
2004 Impact Factor 0.128
2003 Impact Factor 0.154
2002 Impact Factor 0.025
2001 Impact Factor 0.025
2000 Impact Factor 0.025
1999 Impact Factor 0.025
1998 Impact Factor

Impact factor over time

Impact factor
Year

Additional details

5-year impact 0.39
Cited half-life 9.20
Immediacy index 0.11
Eigenfactor 0.00
Article influence 0.09
Website Journal of Low Frequency Noise, Vibration and Active Control website
Other titles Journal of low frequency noise and vibration (Online), Journal of low frequency noise & vibration
ISSN 0263-0923
OCLC 60625924
Material type Document, Periodical, Internet resource
Document type Internet Resource, Computer File, Journal / Magazine / Newspaper

Publisher details

Multi-Science Publishing

  • Pre-print
    • Author cannot archive a pre-print version
  • Post-print
    • Author cannot archive a post-print version
  • Conditions
    • On open access repositories
    • Publisher's version/PDF must be used
    • Publisher reviewed on 18/03/2014
  • Classification
    white

Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: The effects of natural hazards such as earthquakes are serious threat to structures and most researchers have studied structural control systems. Vibration and displacement control of structures under seismic excitation are important problems for which a solution is to use structural control against the disturbances. This paper presents modelling and controller design for flexible structure systems against unexpected disturbance effects such as seismic excitation. The proposed system consists of two flexible floors with active mass damper. The system is set up on a shake-table and disturbances are created by the shake-table. Active mass damper consists of a moving mass actuated by a servomotor, which moves linearly and is mounted on the second floor to suppress structural vibrations and displacements. In simulation works, different types of modeling technique are used to obtain dynamic behaviour of the proposed system and control of the simulated system is carried out using SolidWorks and MATLAB/SimMechanics. Moreover linear quadratic regulator and proportional-integral-derivative controllers are designed to control the moving mass in active mode while the system is under excitation. For this purpose a full-order observer is formed and implemented as control strategy. Furthermore acceleration and displacement responses of the floors and displacement of proportional velocity controlled cart are investigated in passive mode. A set of results verifying the modelling technique, controller performance and effectiveness, displacements of cart, displacements and accelerations of the floors are presented and compared separately for passive and active modes in the form of graphics and tables.
    No preview · Article · Dec 2015 · Journal of Low Frequency Noise Vibration and Active Control
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    ABSTRACT: Mechanical vibrations normally produce adverse effects in structures, machinery and people. One of the most used methods of vibration control is vibration isolation. Amongst the different configurations of isolators, wire rope springs, also known as cable isolators are used for their high capacities of energy storage and dissipation, which is based on dry friction. As a result, they are used in extreme applications such as aeronautical, military, naval, and others involving high vibration and shock levels. An experimental analysis of the quantification of dry friction damping is presented in this paper, estimating the damping by two methods, namely a low frequency sinusoidal input to obtain the hysteresis loops, then a broadband frequency excitation in order to estimate the modal damping. It is found that there is an optimum value of deflection and load on the springs that produce the highest energy dissipation; a similar trend is observed in the two methods considered. This will give more insight into understanding the mechanism of energy dissipation and use of this information to improve the design of vibration isolators.
    No preview · Article · Dec 2015 · Journal of Low Frequency Noise Vibration and Active Control
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    ABSTRACT: Sound transmission loss (STL) tests of acoustic insulation panels are commonly performed in large reverberation rooms. Large size rooms are required by acoustic standards to ensure that a large number of modes can be excited in the frequency range of interest, to create a diffuse sound field. However for STL measurements in low frequency range small enclosures should be able to provide adequate homogenous sound fields, namely 'pressure sound fields'. The expected effect of the air sealed in an enclosure backing a panel, is to increase the stiffness of the panel artificially raising the first natural frequency of the panel, which corresponds to a minimum value in the STL spectrum. In this paper the influence of the air cavity's added stiffness on the panel STL is investigated in detail. As expected the effect of the sealed air is to increase the plate stiffness and as a result to increase the frequency of its first natural mode, however the effect on the STL in this frequency region is unexpectedly insignificant which removes the need for correcting STL measurements using small enclosures in low frequency range-around their first natural frequency of the panels.
    No preview · Article · Dec 2015 · Journal of Low Frequency Noise Vibration and Active Control
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    ABSTRACT: In an active noise-reducing headrest with virtual microphones, the noise attenuation achieved at the ears of the listener usually decreases significantly as the head moves away from the central seat position. This paper presents a study on designing an active headrest with robust performance against head movement. To solve this problem, a minimax optimization problem is presented to design appropriate plant models for the system. Experiments are carried out on an active headrest system with the remote microphone technique. Experimental results show that the proposed method can extend the lateral head movement range from 2 cm to about 6 cm, within which the active headrest provides noise attenuation of greater than 10 dB for both ears of the listener, and thus improve the performance robustness of the active headrest system.
    No preview · Article · Aug 2015 · Journal of Low Frequency Noise Vibration and Active Control
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    ABSTRACT: Hypersonic aircraft always face bad flight environment related to the coupling effects of high temperature and random vibration. Numerical analysis of thermoacoustic characteristics of components inside such an aircraft is presented in this paper. An actual aircraft cabin composite structure including a heat resistant layer, an adiabatic layer and metal frameworks is modeled with the finite element mesh generation method. Transient heat conduction of the hypersonic flight aircraft is analyzed based on a block-iterative coupling method which can consider the atmosphere-aircraft interaction. Then the Von Karman turbulence spectrum is employed to define the random vibration environment of the present aircraft. The thermodynamic response of the system is solved by the pseudo-excitation method which can improve the computation efficiency greatly. Finally, thermoacoustic characteristic of the cavity inside the aircraft cabin is analyzed when the transient heat conduction and random vibration due to atmosphere turbulence are both included. A numerical method is proposed based on a structure-acoustic coupling method which can use acoustic equations to simulate the propagation of the acoustic wave in the flow. It can be found from the computed results that the change of the temperature influences both the thermodynamic characteristic of the aircraft cabin and thermoacoustic characteristic of the component inside the present aircraft significantly. So the coupling effects of high temperature and random vibration on thermoacoustic characteristic of a hypersonic flight aircraft cannot be neglected. The proposed numerical analysis method in this paper can be widely applied to numerical investigations of thermoacoustic systems inside hypersonic aircraft.
    No preview · Article · Jun 2015 · Journal of Low Frequency Noise Vibration and Active Control
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    ABSTRACT: Active vibration control of a cylindrical shell using piezoelectric disks is studied both theoretically and experimentally in this paper. Hamilton's principle is used for deriving dynamic motion equations of the cylinder coupled with piezoelectric disks. The equations are discretised by Rayleigh-Ritz method. An adaptive feedforward controller based on steepest descent method is implemented on a PC to control the modal vibration. The proposed method solves the drawback of using PCs that is sending and receiving data in block form. It is shown that the proposed control system which consists of piezoelectric disks and an adaptive controller is effective in reducing vibration and radiated acoustic noise.
    No preview · Article · Jun 2015 · Journal of Low Frequency Noise Vibration and Active Control
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    ABSTRACT: Non-normality can lead to acoustic disturbances transient growth in linearly stable thermoacoustic systems. This can cause small-amplitude disturbances to grow into limit cycle oscillations and the systems become nonlinearly unstable. Such self-excited limit cycle oscillations are detrimental to the land-based gas turbine and aero-engines. In this work, we demonstrate the conventional controllers such as linear quadratic regulator (LQR) fail in eliminating the transient energy growth, which has great potential to trigger thermoacoustic instability. To minimize the acoustic disturbances transient growth, a transient growth controller (TGC) is designed by considering the non-normality effect. The performance of the conventional controllers and TGC is performed and compared in a horizontal thermoacoustic system with Dirichlet boundary conditions and monopole-like actuators implemented. An acoustically compact heat source is confined and modelled as time-lag formulation. The TGC controller is shown to be able to not only stabilize the thermoacoustic system but also minimize the transient energy growth.
    No preview · Article · Jun 2015 · Journal of Low Frequency Noise Vibration and Active Control
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    ABSTRACT: This paper deals with the procedure of long-term road traffic noise monitoring in urban areas. For the purpose of strategic noise mapping and assessment of harmful effects of environmental noise it is necessary to determine the annual value of noise indicators, mainly by long-term measurements, which can be realized by permanent and semi-permanent noise monitoring. The permanent noise monitoring includes noise measurements of 24 hours a day, 365 days a year, while the semi-permanent monitoring typically ranges from a few days up to several weeks or months. The research described in this paper was conducted with the aim to determine adequate duration of semi-permanent monitoring of road traffic noise in the city of Nis to enable cost-effective monitoring of road traffic noise and determination of noise indicators at multiple locations with only a few noise monitoring stations. Based on the presented sets of measurement results at three locations, it can be concluded that road traffic noise monitoring with a duration of one month yields very acceptable and repeatable values for road traffic noise assessment for the three observed locations. Likewise, the semi-permanent road traffic noise monitoring with a duration of one week or only during workdays yields very usable values for the determination of annual value of noise indicators, which can be used for road traffic noise survey.
    No preview · Article · Jun 2015 · Journal of Low Frequency Noise Vibration and Active Control
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    ABSTRACT: Thermoacoustic instabilities are characterized by self-sustained large-amplitude pressure oscillations, which are produced by the interaction between unsteady heat release and acoustic waves. Such instabilities are detrimental to land-based gas turbine and aero-engines. To mitigate thermoacoustic instabilities, the coupling between unsteady heat release and pressure perturbations must somehow be interrupted. Feedback control techniques with a dynamic controller implemented can be used to achieve this. One of the most classical controllers is based on a finite- r infinite-impulse response filter, whose coefficients are optimized using least mean square algorithm (LMS). In this work we experimentally investigated and compared the performance of four LMS-based algorithms on stabilizing an unstable thermoacoustic system. Effects of the step size and filter length are studied one at a time. It is found that the filter length plays an important role in determining the convergence speed and steady error. In addition, the step size involved in the LMS algorithms is shown to be varied over a wide range. However, when the step size is small, simplified/revised LMS-based algorithms perform better than the conventional one in the absence of a feedback term. However, with the step size increased, these algorithms behave similarly. In order to improve the performance of conventional LMS-based algorithms, a time-varying step-size controller is developed and experimentally implemented. Approximately 50 dB sound reduction is achieved. The controller is also demonstrated to be able to track and prevent the onset of new limit cycle resulting from the changes of fuel flow rate. Finally, the transfer function of the thermoacoustic system is measured by injecting broad-band white noise.
    No preview · Article · Jun 2015 · Journal of Low Frequency Noise Vibration and Active Control
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    ABSTRACT: A special pattern of thermoacoustic oscillation has been observed in a Rijke burner. The acoustic pressure histories show obvious amplitude modulation at very low frequencies, namely beating instability. Accompanied with the amplitude modulation, the porous-plug stabilized flame also shows low frequency pulsations. This beating can be caused by the interaction of flame dynamics at different time scales. Accordingly, dynamic models of a ceramics stabilized flat flame are developed at two distinctive time scales and embedded in an acoustic network system. Simulation results show that low frequency flame temperature pulsation can lead to obvious amplitude modulation. Furthermore, aiming to suppress the beating instability with active control, the effects of amplitude modulation on thermoacoustic oscillation control have been studied. A phase shift controller and a phase lag compensator are tested, and the simulation results illustrate the challenge that may be encountered in the control of beating instabilities.
    No preview · Article · Jun 2015 · Journal of Low Frequency Noise Vibration and Active Control
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    ABSTRACT: Lean Premixed Pre-vaporized technology aiming at reducing nitrogen oxide emission has an inherent drawback of causing combustion instability. Model-based active controller design to suppress the unstable combustion needs the open-loop transfer function of the object which is difficult to acquire and often with inaccuracies in many ways. Desired dynamic equation based PID (DDE-PID) is a model free control strategy which requires little knowledge of the object process, and also has the advantage of limited number of parameter variables to be tuned and simplicity of tuning method. A certain DDE-PID controller is designed and a set of parameter tuning method is given and tested on a open loop transfer function obtained from real experimental data fitting. With nonlinear features like input amplitude limiting and output limiting to resemble the actual system, the simulation results are compared with two model based control strategies which has been tested in actual system and proved to be feasible. The result shows DDE-PID could achieve similar control effect with structural simplicity and tuning easiness.
    No preview · Article · Jun 2015 · Journal of Low Frequency Noise Vibration and Active Control

  • No preview · Article · Jun 2015 · Journal of Low Frequency Noise Vibration and Active Control

  • No preview · Article · Jun 2015 · Journal of Low Frequency Noise Vibration and Active Control
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    ABSTRACT: The stability and non-normality of an open-ended thermoacoustic system with three different mean temperature configurations are considered. An acoustically-compact heat source is confined and modeled by using a modified form of King's Law. Coupling the heat release model with a Galerkin series expansion of the acoustic waves enables the time evolution of flow disturbances to be calculated, thus providing a platform on which to gain insights on the thermoacoustic system stability and non-normality behaviors. The three mean temperature configurations are a). the mean temperature in pre- and after-heater regions is assumed to be same, i.e.. (T) over bar (2)/(T) over bar (1)b). the mean temperature in the after-heater region is undergoing a sudden jump, i.e. (T) over bar (2)/(T) over bar (1) c). the mean temperature in pre and after-heater regions is undergoing linear variation with axial location, i.e. (T) over bar = T-0 + ax. First the mechanism of combustion oscillations in the modeled thermoacoustic system with the third mean temperature configuration is verified. Then the mean temperature effects on the thermoacoustic eigenfrequency and eigenmode are investigated. Compared with the experimental measurements, the predicted eigenfrequencies with the third configuration agree better with the experimental measured ones. Furthermore, the differences in the mean temperature configurations result in a variation in combustion modes. Last the mean temperature effects on the transient growth of acoustical energy are studied. The transient energy growth analysis of acoustic disturbances is performed by linearizing the heat source model and recasting it into the classical time-lag N-tau formulation. Comparison is then made between the predicted transient growths from the thermoacoustic systems with different mean temperature configurations. It is shown that the mean temperature distribution plays an important role on determining the thermoacoustic system stability. It is also found that different mean temperature configuration leads to different maximum transient growth rate.
    No preview · Article · Jun 2015 · Journal of Low Frequency Noise Vibration and Active Control
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    ABSTRACT: For a gas turbine combustor, an accurate transfer matrix of the burner is an essential prerequisite for stability analysis of combustion instability. This paper describes two numerical methods for the computation of burner transfer matrix (BTM) derived from the experimental method and an experimental validation. In the numerical study, Helmholtz equation with the boundaries of plane wave radiation is solved by employing a finite element code. As alternative to the finite element method (FEM), the BTM is also assessed through using acoustic network method (ANM). In the experimental study, complex acoustic pressure at the combustion chamber firstly can be evaluated based on multi-microphone method (MMM) from three measurement points in the plenum and BTM calculated by the FEM or ANM, then be compared with the measurement for the BTM validation at resonance frequency self-excited by the combustion instability of the combustor consisting of a supply plenum, a premixed swirl-stabilized burner and a combustor chamber. The validation shows that the three calculated values are essentially the same as the experimental data, when resonance frequency approximately equal to194, 243 and 290Hz. The results indicate that acoustic behavior of the complex swirl burner can be evaluated successfully by mapping the burner to a network consisting of simple elements.
    No preview · Article · Jun 2015 · Journal of Low Frequency Noise Vibration and Active Control

  • No preview · Article · Jun 2015 · Journal of Low Frequency Noise Vibration and Active Control