Sound and vibration monitoring for machines

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Sound and vibration monitoring for machinesNational Instruments has unveiled the NI Sound and Vibration Measurement Suite Version 6.0 and the newest 16-channel data acquisition module for sound and vibration, the NI PXI-4495. The Sound and Vibration Measurement Suite 6.0 is the most comprehensive National Instruments collection of analysis and signal processing tools for applications including: machine condition monitoring (MCM); noise, vibration and harshness (NVH); and audio test.

This suite includes both the NI Sound and Vibration Assistant 6.0 (application software that combines interactive, configurable data acquisition, analysis and data logging) and NI LabVIEW analysis VIs. The new version extends sound and vibration measurement capability with order analysis support in the Sound and Vibration Assistant and new LabVIEW VIs for torsional vibration measurement and human vibration weighting filters. In addition, the 16-channel, 24-bit, DC-coupled PXI-4495 complements the PXI-4496 and PXI-4498 high-channel-count dynamic signal acquisition (DSA) modules.

National Instruments says that the Sound and Vibration Assistant is designed to simplify the process of acquiring and analysing noise and vibration signals by offering a standalone, interactive analysis and acquisition environment. The standalone software offers a way to interact continually with varying data analysis settings while logging data to disc for more analysis later. For example, engineers can vary the weighting and bandwidth of an octave spectrum while recording sound-level data or adjust the window applied to a power spectrum while recording overall vibration readings. In addition, the Sound and Vibration Assistant makes it possible to share acquired signals and analysis results with other applications through universal file format (UFF) file I/O support.

Torsional vibration

Analysis features included in the Sound and Vibration Assistant cover NVH, MCM and audio test applications. The assistant also provides analysis functions such as power spectrum, octave analysis, frequency response, sound and vibration level, tachometer processing, order analysis and order tracking. Engineers can use the Sound and Vibration Assistant in the measurement of commercial audio devices including cell phones and speakers. Maintenance engineers can use the Sound and Vibration Assistant in MCM applications in industries including power generation and oil and gas.

The Sound and Vibration Measurement Suite 6.0 extends the analysis functionality of NI LabVIEW software with torsional vibration and human vibration weighting filter LabVIEW VIs. Torsional vibration is a common phenomenon for rotating machinery such as engines, compressors and turbines; monitoring torsional vibration helps to ensure that the system operates properly. Human vibration refers to the effects of mechanical vibration on the human body. Measuring and analysing human vibration signals can help control the negative effects of mechanical vibration in applications involving the human body.

Data acquisition module

National Instruments' PXI-4495 is a high-accuracy, DC-coupled data acquisition module specifically designed for high-channel-count sound and vibration applications such as structural health monitoring, electrical power measurements and MCM. With 16 simultaneously sampled channels in a single PXI module, the PXI-4495 is twice the density of any other simultaneously-sampled DSA device from NI. Engineers can use the NI PXI-4495 in an 18-slot PXI chassis to synchronise up to 272 channels. The module saves application development time by reducing the need for code generation because it is programmed with NI-DAQmx featuring DAQmx Channel Expansion functionality, allowing data acquisition code to be the same for one channel, 16 channels or 272 channels. The PXI-4495 module features a maximum sampling rate of 204.8 kS/s per channel.

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09 January 2008

National Instruments Corporation (UK) Ltdvisit website
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