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Bing presentation
Description
Features
Bing is a software for
measuring elastic (longitudinal modulus of elasticity, transverse shear modulus) and non-elastic
(internal friction associated with each resonance frequency) characteristics of any rigid material:
- Wood
- Steel
- Concrete
- Composites, …
From a geometrically regular sample (according to beams theory) of section selected among 7 available,
whose support conditions are controlled (elastic supports, free-free boudary condition) and subjected to longitudinal
or transverse vibrations.
Bing software, currently at version 9, was initially developed to assess the material wood, it pilots BING
measuring device which consists of four separate parts:
- A sensor (microphone, accelerometer, laser, …)
- A low pass filter (anti-aliasing)
- An acquisition card
- A computer on which is installed Bing software
Here is a list of main innovations introduced:
- A GUI upgraded to provide enhanced user interface.
- New transverse sections allowing to make measurements on circular (solid or hollow), rectangular (solid or hollow), elliptic, I shaped or T shaped samples.
- Sample's physical characteristics typing simplified due to the ability to easily connect a balance and a caliper.
- A fast and self-powered acquisition card, plugged on USB port.
- Multiple acquisition and signals/frequency spectra display settings.
- An automatic detection of resonance frequencies feature through an optimized algorithm, achievable on one-click.
- New data and information proposed as results: uncertainties on the modulus of elasticity, damping values associated with a resonance frequency, and so on.
BING testing method: the principle
The BING method of mechanical characterization is based on the study of the vibrations of a piece of wood.
Indeed, a piece of wood subjected to vibrations is a frequently encountered mechanical system: subject tree in the wind, result
of impacts on a floor, musical instruments, wooden structure subjected to soil movements, and so on.
The ratio of the modulus of elasticity to the density of the material, called specific module, is homogeneous
to the square of speed and corresponds to the propagation speed of a signal in the material.
This relationship indicates the existing connection between mechanical properties and vibratory behavior.
Spectral analysis of longitudinal or transversal natural vibrations permit to identify the natural frequencies of a beam from its response
to an excitation pulse, applied to one end to simultaneously seek all vibration modes. The first mode is also called fundamental
mode and its frequency is called fundamental, higher ranked modes are always at higher frequencies.
By analyzing the recorded acoustic signal if we can identify one or more vibration frequency of the system
then we can get the mechanical properties of the tested sample.
To this end, the models developed by Bernoulli (the simplest model) and/or Timoshenko (more elaborate model)
establish the relationship between vibration frequencies and mechanical properties. Both models are based on the
assumption of an homogeneous material. The Bernoulli's model does not take into account the shear between the
beam's straight sections, in other words beam's sections stay perpendicular to the beam's neutral line.
The Timoshenko's model takes into account a shear angle that reflects that straight sections are not
perpendicular to the neutral line.
As a result of the work undertaken since the late 80's by CIRAD and in particular through the work of P.A. Bordonné, a system to get quickly longitudinal or transversal modules of elasticity by analysis and interpretation of the of natural vibrations' spectrum of a piece of wood has been designed, developed and implemented. This device, originally designed for normalized samples, can be used now for pieces covering a wide range of sections and dimensions. Two impulse solicitation modes can be practiced:
- In transverse direction, via a percussion perpendicular to the axis of the sample.
- In longitudinal direction, via a percussion on the axis of the sample
The element to be tested is put on two elastic supports so that the propagation of vibration is as free as possible and can be caused by a simple percussion on one end. At the other end, a microphone (or any other motion sensor) records the vibrations and transmits them via an anti-aliasing filter (low-pass) to an acquisition card playing the role of an analog-to-digital converter and providing to the computer the digitized signal, processed by Fast Fourier Transform (FFT) to interpret the information in the frequency domain. The mathematical processing of selected frequencies (calculation and linear regression) is software-made from the geometrical characteristics and the weight of the sample.
Comparative test realised at CIRAD showed a very good correlation with results
obtained by conventional transversal tests (3 and 4 points) on wood samples of all sizes, with and without defect.
To read more:
- Loïc Brancheriau and Henri Baillères (2002): "Natural vibration analysis of wooden beams: a theoretical review", Wood Science and Technology, Springer - Verlag (Ed), Vol. 36, N°4, pp. 347-365.
- Loïc Brancheriau (2002). "Dynamic analysis of sawing wood for strength grading". Thèse de l'Université de la méditerranée - Aix Marseille II, École Supérieure de Mécanique de Marseille. p. 267.
Device composition
Commercialized Bing device includes (in its full version*) the following:
- An USB self-powered acquisition card PicoScope 3224 made by Pico Technology.
- A sensor (microphone, accelerometer, laser beam, …).
- A low-pass filter (anti-aliasing).
- A licence of Bing software.
* Some items can be purchased separately from the software.
[Back to top]History
Since 2007: Improvements of Bing 9. Validation under Windows Seven.
2007: Bing 9 is realeased. It runs under Windows 2000/XP/Vista and is connected to a USB self-powered acquisition card PicoScope 3224 made by Pico Technology.
2000: Bing 8.0 is realeased, which commercial name is Bing 2000. It runs with an ADC-216 acquisition card (16 bits, connected on parallel port) made by Pico Technology. The optional connections with balance and/or caliper are no more available in this version.
1999: Bing 7.0 is realeased, sold with an ADC-212 (12 bits) or ADC-216 (16 bits) acquisition card made by Pico Technology. This version runs under Windows 95 or 98.
1998: Bing 5.0 and Bing 6.0 are realeased, sold with an ADC-212 (12 bits) acquisition card made by Pico Technology. They both run under Windows 3.1 and/or Windows 95 in its 32 bits version. The connection of a balance and/or caliper is also possible for batch measurements.
1995 à 1997: Initial analysis version (used under DOS) was added a graphical interface to be used under Windows 3.1. Subsequently, components came to be joined with the electronics allowing an improved measurement reliability (ex: anti-aliasing filter). In 1997, commercial pre-version Bing 5.0 is finalized: it runs under Windows 3.1 with an ADC200/50 (8 bits) acquisition card made by Pico Technology.
1989: First version of modal analysis, running under DOS.
[Back to top]Screenshots
Related services
Custom software ans solutions development, consulting, training on demand, support, etc. For more information please contact us.
[Haut de page]Download and buy
Downloading
Bing can now be used for a 30-day* free trial with a complete feature set. After this period all features will be disabled, you will have to register to continue using Bing. To get an evaluation code or purchase a licence and get your registration number please contact us.
| Latest version | 9.5.0 (May 26, 2010) |
| Size | 4,23 MB |
| Requirements | Windows 2000/XP/Vista/Seven |
| Languages | English, French |
* Use for 30 days (not necessarily consecutive), can be run an unlimited number of times each day.
Rates
Bing's full device is sold 1.600 € (approx. 2.000 USD).
Bing software is sold 800 € (approx. 1.000 USD).
Buy both Bing and Wisis
devices for 6.100 € (approx. 7.700 USD)!
For more information about pricing and available options please
contact us.
Drivers
To use Bing you have to install the acquisition card's drivers. Here are the latest versions tested and recommended by CIRAD:
- Windows 2000: Pico Technology Software release 5.18.0
- Windows XP/Vista/Seven: Pico Technology Software release 5.20.1
Drivers can be downloaded directly on this page, filling in required fields as follows:
- Stage 1: "Please select product", select PicoScope 3224
- Stage 2: "Please select software", select last version approved by CIRAD
For a better installation of drivers please refer to the Bing documentation (included with the software).
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