dBVision

dBVision: Track the noise with images!
Taking advantage of the unrivaled accuracy of Nearfield Acoustic Holography (NAH) for identifying noise weakness parts in your products.
This powerful software package is dedicated to acoustical imaging (pressure and intensity) based on the holography technique. dBVision enables to localize the sources with a spatial resolution that only holography can reach.

Sound intensity and partial power can be derived from the preliminary data analysis in order to establish a ranking of the noisy components, thus making dBVISION a powerful tool for the improvement of a large panel of products.

Needing the accuracy of acoustical holography for eradicating sound sources?

dBVISION provides you with the power of Nearfield Acoustical Holography (NAH) for:

Best accuracy in noise Source localization
Most operational process for capturing the real test situation (RELAX technology)
Unique patented IPS technology for CABIN noise processing
Source quantification through immediate radiated power evaluation (global & partial)

Key Features

A wide rangefitting general and specific customers requirements of solutions complying with dimension of the tested structure and application fields:

dBVision (inside vehicle, cockpits)
dBVision MARINE (signature of naval vessels and submarines)
dBVision ENGINE (on running engine in test bench situations)
dBVision COMPONENT (exterior measurement of test products and components)

With a combined approach (exterior/interior measurements), dBVision demonstrated the benefits of NAH and offers the most cost-effective solution recognized for industrial acoustical investigations pertaining to a wide range of structures and components, from design phase through tuning and modification stages of projects, up to final acoustic optimization.

Best system for diagnosis, comparison and optimization

Accurate Source localization and quantification (ranking) on any tested equipment
Parametric simulation of new potential solutions relying on source masking functions
2D/3D map visualization for an efficient dialog with design office and project management
Perfect tool for benchmarking competing solutions and predicting acoustic final product score (synthesis)

Test productive and cost effective solution

All operational situations met with a choice of compact user-friendly hand-held arrays
Patented IPS coupled to remotely driven DAQ system reduces time & facility (wind tunnel operations, ...) costs
Fully automated test procedures relying on robotized instrumentation for increasing added value time, dedicated to analyzing processed data and developing your most competitive solution

dBVision Technical Specifications

Software package

Data acquisition and database management

Near-field pressure measurement, 3D visualization of measurement array locations
Spectral analysis, holography mapping, noise source localization
Visualization of pressure and intensity results (spectra, 2D colour maps),
Global radiation power estimation
Usual mathematical operators on NAH results (+,-,/, ...)
Export to Matlab© (including time domain data)
Batch functionality for data processing and reporting via automatic export to standard office tools

Software options

RANKING - Partial power computations and Source ranking according to selected zones (patch definition)

TL: Transmission Loss computations possibly using selected zones definition (patch definition)
FAR: Far-field predictions capabilities, radiations patterns (directivity, polar diagrams, ...) - standard or advanced modules
EARPREDICT: CABIN Noise level predictions at arbitrary location inside an enclosure
3DV: 3D results display - enhanced interpretation capability
MULTIPLAN: Multiple plan NAH measurement processing & related results display - includes 3DV option
HOLOCYL: Cylindrical NAH measurements, processing & related results display - includes 3DV option
RELAX: Automatic projection of measurement data onto regular grids from arbitrary antenna locations

Hardware components

Acoustic arrays:

Standard 6, 10 and 12 channel arrays of microphones, IEPE* type 5cm spacing
Modular array of microphones, IEPE* type, 10 to 60 channel 2.5cm spacing
Any further array dimensions upon customer's request (esp. for Navy applications)

Reference transducers (microphones, accelerometers, ...) used out of measurement plane
dBVision patented Instrumentation Positioning System: Simple, non-contact geometry positioning device based on ultrasonic technology
2D, 3D and 5D robots for automated testing

Data acquisition

Full compatibility with stand-alone hardware: NetdB-DAQ platforms of 01dB, compact ORCHESTRA, PXI or VXI front-ends.

Product requirements:

Recommended PC computer: Minimum configuration with Pentium IV (2.4 GHz) or Centrino (1.6 GHz) with 512MB RAM, 40GB HDD
XVGA display
OS Win 2000 SP4 or Win XP SP1.

* IEPE: Integrated PiezoElectric Electronic

APLICAÇÕES

Localização de fontes sonoras para componentes

Exemplo de um retrator de cintos) : Obtenção de mapas de ruídos refinadas para cada frequencia de interesse.

Ruído de rodas / cabine

Testes em sala semi-anecoica com Dinamometro de Rolo : Dentro do software dBVISION, se acompanha cada posição de antena automaticamente com uso do sistema de posicionamento IPS.

Também, illustramos medições de ruído interno de cabines dentro de um túnel de vento.

Mapas Holograficas de estuturas grandes e/ou medições exterior

O primeiro exemplo mostra o mapeamento de um transformador eléctrico. Uma antena especifica foi desenvolvida para facilitar o procedimento de medição.

O segunda exemplo mostra o mapeamento do eixo de um máquina industrial, realizado na pátio do cliente, em ambiente externo.

Cabine de Helicóptero

Medição e primeiros resultados em tempo record !

PRECISÃO SEM IGUAL !

Existem 2 técnicas para Imagens Acústicas : Beamforming e Holografia de Campo Próximo. Muitas vezes, as duas técnicas são comparadas e concorrentes, embora sejam complementares:

Beamforming : Para detecção de fontes sonoras distantes (exemplo: pass-by noise, ruidos de plantas industriais, etc).
Holografia : Para detecção de fontes sonoras proxímas.

A grande differença entre as 2 técnicas é a precisão e resolução na descriminação de fontes sonoras : Pela teória do Beamforming, a melhor resolução hoje à 600Hz é de 50cm (veja abaixo), enquanto a Holografia de campo proximo apresenta resolução de fonte inferior a 1 cm.

Vejam o exemplo embaixo:

Para mais informações, nós contatar : comercial@01db.com.br