Showing results for: 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 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 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 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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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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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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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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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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Greenville Utilities Commission - Optimizing Pressure Transient Monitoring With Data-Driven Monitor Placement - Case Study
The Greenville Utilities Commission (GUC) provides electric, water, sewer, and natural gas services to more than 135,800 customers in Greenville and across Pitt County, North Carolina. The utility’s distribution network is composed of approximately 70% polyvinyl chloride (PVC), 20% asbestos-cement (AC) and 10% cast iron pipelines. Providing a reliable supply of water while effectively ...
By Syrinix Ltd
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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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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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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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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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Mancomunidad de la Comarca de Pamplona (MCP) Identifies 4 Leaks Using Inline Leak Detection
Around the world, leaking water pipelines represent a major resource and financial loss for utilities. It is estimated that in some places, Non-Revenue Water exceeds 50 percent. In terms of financial losses, the World Bank estimates that NRW costs utilities worldwide about US$14 billion annually. By reducing these losses by half in areas with the highest NRW, it is estimated that US$2.9 billion ...
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