acoustic analysis Articles
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Acoustic optimisation design for suspension characteristics based on the method of dynamic subsystem modification
Based on the finite element technique on the structure-acoustic coupling analysis, a dynamic subsystem modification method for the acoustic-vibration characteristic of an elastic thin-walled cavity is introduced in this paper. It is directly applied to the dynamic modification of an automobile's passenger compartment and then supports the Noise, Vibration and Harshness (NVH) performance analysis ...
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Vibro–acoustic computation of irregular cavities using a combined analytical–finite element approach with application to vehicle interior acoustics
A combined analytical–finite element approach is developed for more accurate representation and time efficient calculation of the acoustic frequency response function (AFRF) of a three–dimensional vehicle cavity with planar irregularities. In the proposed approach, finite element method is only used for determining modal properties of the two–dimensional irregular shape, while the analytical ...
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Vibro-acoustic analysis of functionally graded circular discs under thermal environment
A circular disc made up of Functionally Graded Material (FGM) with several cases of FGM index are modelled and their vibration response to a harmonic point load in a thermal environment with temperature dependant material properties was computed by using the Finite Element Method (FEM). A macro was developed by the corresponding author in ANSYS Parametric Design Language for modelling FGM using ...
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Vibro-acoustic analysis of composite circular disc with various orthotropic properties under thermal environment
Composite circular discs with polar orthotropic and rectangular orthotropic fibres of different composite materials are modelled and their vibration response due to harmonic point load under thermal environment was computed by Finite Element Method (FEM) using ANSYS. Acoustic response of composite circular disc was computed by coupling the vibration data from FEM to the Boundary Element Method ...
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Acoustic Simulation - Case Study
Ingeniería Acústica García-Calderón is a consultancy dedicated to the measurement, simulation, prediction and elaboration of proposals for corrective measures to evaluate and / or minimize noise and vibrations in the environment. The acoustic studies are carried out to determine the existence and degree of noise pollution that will affect people and the ...
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Investigation into noise problems in vehicle structure using vibro-acoustic approach
The main focus of this paper is the study of the relationship between components of vibration and noise inside the passenger cabin of a production vehicle. The noise inside automobiles is largely composed of contributions from the engine, ground and wind. The engine and tyres successively transfer the vibration via the structural connections to the body panels, which then propagates through the ...
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The sound quality of vehicle interior noise: a challenge for the NVH-engineers
The sound quality of vehicle interior noise has become a very important task for the acoustic engineers since more than 20 years. As vehicles become more and more quiet, the customer's sensitiveness for the acoustical comfort increases. On the one hand, no disturbing noises should be heard and on the other hand, the perceived sound quality, for example from the powertrain, should fulfill the ...
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A numerical structural-acoustic approach to analysis of interior booming noise and noise reduction in an all-terrain tractor cabin
The booming noise in an all-terrain tractor cabin is studied in this research via a numerical structural-acoustic approach. Cavity acoustic resonances of the cabin are evaluated, and the acoustic resonant frequencies are identified and quantified in the research. The noise level inside the cabin is determined, and the frequencies characterised by peak noise levels within the booming noise ...
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FIDO halves leak run time for United Utilities - Case Study
UPDATED: United Utilities successfully uses FIDO AI to negate false positives, eliminate human error and halve leak run time. The Challenge United Utilities has one of the largest fixed logger estates in the world with 67,000 devices generating 600 new leak alarms every day. With no way to identify false positives, each alert had to be analysed manually in order to schedule ...
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Laser Doppler vibrometer for mode shape and power flow analysis in coupled structures
In this paper, an experimental technique is introduced to investigate the structural response under impact loads, which consists of the waveform measuring technique in the time domain by using the WAVEVIEW software, and steady-state measurements by using the Polytec Laser Scanning Vibrometer (PLSV) in the frequency domain. The waveform measuring technique is introduced to obtain the waveform at ...
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Characterization of Fractal Particles Using Acoustics, Electroacoustics, Light Scattering, Image Analysis, and Conductivity
Fractals are aggregates of primary particles organized with a certain symmetry defined essentially by one parameter a fractal dimension. We have developed a model for the interpretation of acoustic data with respect to particle structure in aggregated fractal particles. We apply this model to the characterization of various properties of a fumed silica, being but one example of a fractal ...
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Structural acoustic modelling of three dimensional enclosed sound fields with active/passive piezoelectric networks
In this paper, analytical effort for modelling piezoelectric-structural acoustic interactions of sound transmission through a flexible smart panel into an enclosure is presented. A spherical wave is transmitted into a rectangular enclosure through a flexible panel, while piezoelectric patches, bonded on the panel, are used as actuators and /or passive dampers. The developed model accounts for ...
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A study of the coincidence effect and critical frequency of a dash panel using the hybrid FEA–SEA and experimental methods
This paper provides a new method to determine critical frequencies of any engineering structures by identification of peak frequencies of their internal damping loss factor curves. The novelty embodies the following aspects: first, the indirect method was applied to measure the critical frequencies of large complex thin–walled panels; second, the hybrid FEA–SEA was applied to analyse the sound ...
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Device combines pressure monitoring with acoustic leak detection
In the world of municipal water and sewer maintenance, leaks are money. Not only does that mean money down the drain, but technically right out the drain as well. Those additional treatment and conveyance costs mean not only decreased revenue, but also increased costs in leak detection and pipeline repair. To combat the issue, Syrinix has launched the PIPEMINDER-ONE Acoustic, a device that ...
By Syrinix Ltd
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Evolution of water-in-oil emulsion controlled by droplet-bulk ion exchange: acoustic, electroacoustic, conductivity and image analysis
Water-in-kerosene emulsion stabilized with SPAN surfactant exhibits a slow transition (on scale of hours) from an emulsion to a mini-emulsion state. We continuously monitor this transition in the relatively concentrated samples (5 vol.% water), without dilution, using acoustic, electroacoustic and conductivity measurements. Continuous stirring prevents sedimentation. We confirm our measurements ...
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Accurate and efficient prediction of acoustical performance of noise barriers against transport noise pollution
An improved acoustical wave propagator (I_AWP) technique with high-order absorbing boundary technique is introduced to evaluate the acoustical wave interaction for noise barriers, providing the dual benefit of preserving high numerical accuracy (boundary conditions have been properly treated) and obtaining high computational efficiency (using a larger time step in the calculation). The aim is to ...
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Application of a three-dimensional hyperbolic location system to the false killer whale (Pseudorca crassidens) depredation issue
Depredation by false killer whale (Pseudorca crassidens) is a serious problem for pelagic longline fishing in the Coral Sea. These interactions have raised substantial ecological, economic and social concerns. McPherson et al. proposed post-processing of passive acoustic recordings to analyse general odontocete acoustic behaviour and assess the effectiveness of systems being developed to reduce ...
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ZE: 908 Acoustic Interface - The simple way to integrate noise measurements in industrial settings
The ZE: 908 allows users to add a noise measurement capability to an existing process control system. The ZE:908 is a small, lightweight power supply and acoustic conditioning unit for microphone preamplifiers, it is ideal as a front-end for data logging and analysis systems where a simple and accurate acoustic input is required as an interface between an acoustic transducer and a process ...
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Acoustic fingerprinting for rock identification during drilling
During the process of mining, it is imperative to know the type and properties of the rocks being handled. The current technology for this involves core drilling, and subsequently subjecting the drilled cores to various tests in the laboratory, to identify the rocks and establish their properties. In many cases, obtaining a sample may be cumbersome and/or non–profitable. This paper presents a ...
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Traffic Noise Mapping in Chile
Against this backdrop of economic change, a two-year study got underway across three Chilean cities led by the Univ. Austral. and was supported by the Chilean Ministry of the Environment. Academically titled: “Development and analysis of noise maps of three urban agglomerations using modeling software”, the study concentrated on the Chilean cities of Coquimbo – La Serena, ...
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