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Vibration analysis Sur iTunes

This allows the evaluation of not only the strength and frequency of the vibration, but also the speed of rotation of various mechanisms: fans, motors, various rotating components; since the vibration frequency often (but not always) coincides with the frequency of rotation.  Should vibration frequency exceed 50 Hz, the peak will be recorded at an incorrect frequency, and hence speed or displacement will not be calculated correctly.  The application analyzes the data from the phone's accelerometer and builds a vibration spectrum.  The application will be useful in determining the quality of fans and motors, in determining whether their actual parameters coincide with the ones declared by the manufacturer, it will find its uses in monitoring of malfunctions (e.g. in bearings) or while testing the quality of assembly and balancing of the homemade mechanisms with rotating parts.  In addition to decreasing vibration for the iPhone, a foam pad improves contact between the iPhone and the vibrating part, which makes the transmission of vibration more accurate and produces better results.  When converting acceleration into speed or displacement, at 0-5 Hz frequencies noise starts prevailing over vibration peaks, which is why such frequencies are disregarded when doing the conversion.  If the analyzed vibration is too strong, use a foam material pad, or put your iPhone at a distance where the force of the vibration is not dangerous to your device.  • Root mean square (RMS, for vibration) or average value (AVG, for absolute values) for vibration wave.  • Values of any point (for frequency scale and sound wave (at maximum detail)).  To activate the settings, turn on the "Vibration wave" mode and turn off the "Only fluctuations" mode.  • Linear frequency scale with maximum details (there is a choice for the displayed frequency range).  Unrealistically high speed or large displacement may be a sign of this kind of false frequency.  Files with saved data (SavedData_[date]_[time].txt) can be copied to a desktop/laptop computer or transferred to another iPhone using iTunes.  to 40 sec.). For an accelerometer connected to the headphone jack FFT size from 2048 to 131072.  Do not expose your iPhone to an excessive vibration, as it may break.  The parameters of the accelerometer depend on the temperature and voltage of the battery, and may change over time.  • A stroboscope for an external accelerometer (the feature was proposed by Todd French from Los Angeles, California).  • FFT size (for built-in accelerometer): 64, 128, 256, 512, 1024, 2048, 4096 (data collection time from 0.64 sec.  To obtain stable values, the accelerometer should work for several minutes.  • Accelerometer connects to the headphone jack (measurement range from 5 Hz to 24000 Hz).  • Selecting which axis of the accelerometer is to collect data.  Values are calculated only for data displayed on the screen.  Need EXCLUSIVELY for measuring absolute acceleration values (gravitational acceleration).  • Calibration of the built-in accelerometer.  • Window functions (Blackman, Hamming, Hann (Hanning), Blackman–Nuttall, Gaussian, Flat top).  • Export data to a text ("Y=[y1 y2... yn]", "y1;y2;... yn", "x1;y1\nx2;y2;...") or WAV file.  Y-axis: g, m/s², ft/s², mm/s, in/s (ips), mm, mil, dB(A), dB(V).  • Saving the measurement results in the application.  Number of points is adjusted via "FFT size".  For Bluetooth-accelerometer FFT size from 512 to 32768.  • The choice of units of measurement.