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Vibration Measurements In Wind Power Turbines
- 1. Vibration measurements in wind power turbines Alex Lollio Nov, 2010
- 2. Agenda Why vibration measurements? National Instruments solution Hardware Software Positioning vs competition Conclusions
- 6. High vibration level10 kg Mechanical stress Noise emission
- 8. It needs a PC or PLC to collect dataKey point : System integration
- 9. Agenda Why vibration measurements National Instruments solution Hardware Software Positioning vs competition Conclusions
- 10. NI Hardware Platform Multi-Chassis Application Complexity PXI PXI-Laptop cDAQ USB Channel Count
- 11. The simplest NI hardware solutions NI 9234 (4-channels, 24 bit IEPE, 51kS/s) Price: 1564 € + Carrier USB 9162 Carrier WLS-9163 + + Carrier ENET-9163 Price: 251 € Price: 443 € Price: 342 €
- 13. 800 MHz processor, 4 GB nonvolatile storage, 512 MB DDR2 memory
- 14. Dual Ethernet ports with embedded Web and file servers for remote user interfacing
- 15. Hi-Speed USB host port for connection to USB flash and memory devices
- 16. RS232 serial port for connection to peripherals; dual 9 to 35 VDC supply inputPrice: 4190 €
- 17. Software: LabVIEWSound and Vibration Meas. Suite Vibration Level Spectrum Analysis (baseband, zoom, subset FFTs) Frequency Response (broadband, swept-sine, impact, shock-response) Short-time Frequency Analysis (STFT) Over 60 examples using both hardware and simulated data Hardware independent (but has example support for all DAQmx devices) UNI/EN standard Price: 3887 €
- 19. Example: Power Spectrum Rotating Speed: 60 Hz (3600 RPM) Frequency components shift with speed change Rotating Speed: 50 Hz (3000 RPM)
- 20. Order Power Spectrum Rotating Speed: 60 Hz (3600 RPM) Order components remain fixed with speed change Rotating Speed: 50 Hz (3000 RPM)
- 21. Relationship of Orders and Faults We can diagnose machine faults by knowing the order: Imbalance Misalignment Loose Coupling Valve Noise Bearing Defects / Wear Blade Pass Frequency Gear Mesh Low Order High Order
- 22. Relationship of Orders and Faults We can diagnose machine faults by knowing the order: 3 blades wind turbine 3TH order component associated with blades mismatch
- 23. Overview of the Order Analysis Toolkit Calculate and examine rotational speed Measure power in the order domain as a function of rotational speed Extract individual orders Measure magnitude and phase of any order component as a function of rotational speed Present data in a waterfall, orbit, or polar plot UNI/EN standard
- 25. Linear (default)
- 26. Spline
- 27. Filter basedSamples extrapolation (8 samples per period) Result: Sample at constant angle
- 28. Agenda Why vibration measurements? National Instruments solution Hardware Software Positioning vs competition Conclusions
- 29. Positioning vs Competition NI Strengths Less expensive per channel (NI: € 270-770; Others: € 770-3900) More expandable – up to 5000 channels in a distributed architecture Compliance with ANSI and IEC Standards – Competition will try to say we don’t meet these standards UNI/EN certification More flexible software (LabVIEW support for custom analysis and mixed signal)
- 31. Easy to integrate into existing systems
- 32. NI Sound and Vibration Measurement Suite is not hardware dependent
Editor's Notes
- Resampling and Comparison Setup—Contains the following options:Interpolation type—Contains the following options:Coerce—Sets each output sample value to equal the input sample value that is closest to it in time.Linear—(Default) Sets each output sample value to be a linear interpolation between the two input samples that are closest to it in time.Spline—Uses the spline interpolation algorithm to compute the resampled values.Filter based—Uses an interpolation method based on the convolution of the signal with a finite impulse response (FIR) filter.Operation—Specifies the arithmetic operation to perform. You can select from the following options:Add—(Default) Adds the input signals.Subtract—Subtracts the second input from the first.Multiply—Multiplies the first input by the second input.Divide—Divides the first input by the second input.FIR Filter Specifications—Contains the following options:Normalized bandwidth—[Interpolation type: Filter based] The normalized cut-off frequency of the FIR filter to use. The default is 0.4000.Alias rejection (dB)—[Interpolation type: Filter based] The minimum stopband attenuation of the FIR filter to use. The default is 80 dB.