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How do the sampling during run up of machines?
Hello kmgary Sampling rate is 50 kHz, thus this mean fmax=20kHz? If fmax=20kHz and you have 3200lines the resolution is 6Hz, this is 180/min, so your first line is 180/min, the second 360/min , you will have only 15 significant lines for an run-up 0-3000/min, this looks no good. Good luck. DePauw- DePauw
- Post #8
- Forum: Mechanical Acoustics/Vibration engineering
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3x vibration
Hello Ksener I think looseness is the problem. You chech it like this : put a clock-meter ( 0.01mm) on the axis and lift the ventilator with a jack, 0.05 mm is normal, 0.1 mm is still good, 0.2mm or more is bad. Good luck DePauw- DePauw
- Post #2
- Forum: Mechanical Acoustics/Vibration engineering
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How do the sampling during run up of machines?
Hello kmgary First to know is the total run-up time. Then you divide it in +- 20 to 50 pieces In each part you take a mesurement, attention there is a relation between number of lines, max freq and sampling time. The problem is the FFT, this algoritme thinks that the speed is constant so it...- DePauw
- Post #4
- Forum: Mechanical Acoustics/Vibration engineering
