Análise de vibração de um motor a partir de Arduino e identificação de falhas

Olá a todos. Sou novato no mundo do LabVIEW, por isso gostaria de uma ajuda de vocês. Tenho em minha faculdade o LabVIEW 2010.
Estou realizando meu projeto de final de curso e tenho como objetivo identificar falhas em um motor a partir da vibração medida com um acelerômetro. Para explicar melhor meu objetivo, separei ele em três problemáticas:
- Aquisição de dados:
O primeiro passo é realizar a aquisição dos dados provindos do sensor. Visando baixos custos, opitei por usar o conjunto Arduino + Sensor ADXL345. Porém tive dificuldades em utilizar o protocolo I2C com o LabVIEW usando o LIFA (LabVIEW Interface for Arduino). Acabei optando por utilizar o próprio Arduino para medir a vibração e usar o VISA do LabVIEW para realizar a aquisição de dados. Para isso utilizei o VI em anexo que encontrei na internet. ele funciona muito bem, mas gostaria de utilizá-lo como Sub-VI em outro VI, já que o acelerômetro tem três medidas (X, Y e Z) e estou tendo dificuldades para isso, graças ao White Loop. Tirando o White Loop e os Switches, não consegui fazer dados saírem para outro VI, alguém pode me dar uma luz?
- Tratamento dos dados:
Antes de identificar o erro, gostaria de aplicar uma transformada de fourier nos dados que estão entrando (x, y e z) a fim de gerar um gráfico no fomínio da frequência. Alguém tem um exemplo de uso do bloco de transformada de Fourier no LabVIEW para eu estudar? Outras dicas são muito bem vindas.
- Comparação dos dados:
O último passo é usar alguma técnica de comparação de dados (como o Comparison Express) para comparar a vibração do motor com dados previamente armazenados em um arquivo de texto ou planilha, com a finalidade do LabVIEW identificar por conta própria qual é a falha presente no motor. Porém tive dificuldades em usar um arquivo como Input no Comparison Express, alguém já fez isso antes?
Enfim, agradeço antecipadamente qualquer ajuda que receber. Como sou novo no LabVIEW, estou tendo várias dificuldades, mas espero conseguir atingir meus objetivos. Lembrando que estou com o LabVIEW 2010, se vocês puderem compartilhar VIs compatíveis vão me ajudar muito.
Anexos:
Data Aquisition.vi ‏37 KB

Bom dia otaconlink. Tudo bem?
Aquisição de dados:
Gostaria de saber o que você gostaria de modificar no programa, são os dados de vibração?
Tratamentos de dados:
O seguinte link indica alguns exemplos aplicáveis ao seu programa:
http://venus.ni.com/nisearch/app/main/p/bot/no/sn/catnav%3Aexample/ses/false/ap/global/q/fourier/lan...
Comparação de dados:
Você pode utilizar a estrutura de caso.
Alguns exemplos de comparação de dados:
http://zone.ni.com/devzone/cda/epd/p/id/4719
http://zone.ni.com/devzone/cda/epd/p/id/5219
https://decibel.ni.com/content/docs/DOC-12441
http://zone.ni.com/devzone/cda/epd/p/id/5785
Atenciosamente.
Erick Yamamoto
Application Engineer
National Instruments Brazil
Visite a nossa comunidade em PORTUGUÊS!!!

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4tun8mom wrote:
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Message Edited by Troy K on 06-06-2008 02:36 PM
Troy
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I haven't failed, I've found 10,000 ways that don't work - Thomas Edison
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I suspect that the behavior you are experiencing has today
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Example Setup
Stepper
Motor
NI
Motion Controller
10
steps per encoder pulse (Every 10 steps the controller gets an encoder
pulse, therefore positions 0-9 all appear to be 0 to the controller)
The
system has a maximum of 3 pull in moves set
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controller sends out 9 pulses.
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motor moves to position 9.
Closed Loop Scenario
The
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because it has not received an encoder pulse.
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position error in open loop mode, the motor always goes to the same commanded
position. In closed loop mode, the motor
is bouncing around inside the single index encoder pulse trying to find a
certain position.
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correcting this behavior. These
recommendations are in order of effectiveness:
Setup
your system so that there are more encoder counts per revolution than
steps per revolution.
Turn
off pull-in moves by setting them to 0 in MAX.
Use an
open loop configuration.
Play
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Regards,
Luke H

Análise de vibração de um motor a partir de Arduino e identificação de falhas

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