Vibration analysis 4.3.14 - App Store

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About Vibration analysis

The application analyzes the data from the phone's accelerometer and builds a vibration spectrum. This allows the evaluation of not only the strength and frequency of the vibration, but also the speed of rotation of...

The application analyzes the data from the phone's accelerometer and builds a vibration spectrum. 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. 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. Do not expose your iPhone to an excessive vibration, as it may break. 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. 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. BE SURE TO READ THE EXAMPLES OF THE VIBRATION SPECTRUM ANALYSIS AT THE APPLICATION WEB SITE (usefulmobileapps.com). Features of the full version of the application: . The choice of units of measurement. X-axis: Hz or RPM. Y-axis: g, m/s², ft/s², mm/s, in/s (ips), mm, mil, dB(A), dB(V). . FFT size (for built-in accelerometer): 64, 128, 256, 512, 1024, 2048, 4096 (data collection time from 0.64 sec. to 40 sec.). For an accelerometer connected to the headphone jack FFT size from 2048 to 131072. For Bluetooth-accelerometer FFT size from 512 to 32768. . Linear and logarithmic frequency scale. . Linear frequency scale with maximum details (there is a choice for the displayed frequency range). . Peak frequency detection. . Values of any point (for frequency scale and sound wave (at maximum detail)). . Selecting which axis of the accelerometer is to collect data. . Octave bands (1/1,1/3,1/6,1/12). . Window functions (Blackman, Hamming, Hann (Hanning), Blackman-Nuttall, Gaussian, Flat top). . Peak hold. . Exponential spectrum averaging. . Taking a screenshot by lightly touching the screen. . Root mean square (RMS, for vibration) or average value (AVG, for absolute values) for vibration wave. Values are calculated only for data displayed on the screen. . Calibration of the built-in accelerometer. Need EXCLUSIVELY for measuring absolute acceleration values (gravitational acceleration). To activate the settings, turn on the "Vibration wave" mode and turn off the "Only fluctuations" mode. The parameters of the accelerometer depend on the temperature and voltage of the battery, and may change over time. To obtain stable values, the accelerometer should work for several minutes. . Saving the measurement results in the application. Files with saved data (SavedData_[date]_[time].txt) can be copied to a desktop/laptop computer or transferred to another iPhone using iTunes. . Export data to a text ("Y=[y1 y2... yn]", "y1;y2;... yn", "x1;y1nx2;y2;...") or WAV file. Number of points is adjusted via "FFT size". To export octaves, use "x1;y1nx2;y2;...". . Accelerometer connects to the headphone jack (measurement range from 5 Hz to 24000 Hz). . A stroboscope for an external accelerometer (the feature was proposed by Todd French from Los Angeles, California). . Bluetooth accelerometer. 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. 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. Unrealistically high speed or large displacement may be a sign of this kind of false frequency.

Version History • Bug fixes. 4.3.14 Feb 15 • Bug fixes. 4.3.13 11/12/2025 • Minor changes in app design. • Bug fixes. 4.3.12 07/30/2025 • A more detailed zoom level for the vibration wave (time scale). • The way data is drawn on the frequency scale while simultaneously drawing data from all accelerometer axes has been changed. • Bug fixes. 4.3.11 04/15/2024 • Minor changes in app design. 4.3.10 10/14/2023 • Bug fixes. 4.3.9 09/09/2023 • Bug fixes. 4.3.8 08/27/2023 • Minor changes in app design. 4.3.7 08/20/2023 • Adaptation for iPhone 14 Pro. • Added black color theme. • Changing the start frequency of the logarithmic scale when zooming (moving along the logarithmic scale when zooming). • Fixed not working downsampling to 8 kHz for "Mic" axis. • Changed strobe algorithm for external accelerometer ("Mic"). Changed the trigger conditions for the strobe. • Other bugs have also been fixed. 4.3.6 03/18/2023 • Minor changes in text design. 4.3.5 07/03/2022 • Minor changes in text design. 4.3.4 04/11/2022 • Minor changes in text design. 4.3.3 03/14/2022 • Bug fixes. 4.3.2 01/26/2022 • Minor changes in text design. 4.3.1 11/01/2021 • The max length of the data displayed on the time scale has been increased (for bluetooth accelerometer and mic accelerometer). • Bug fixes. 4.3 04/10/2021 • The zoom algorithm for the all data scale and time scale has been changed. • Selecting the range (start frequency) of the logarithmic scale. • Bug fixes. 4.2.1 03/07/2021 • Exponential spectrum averaging. • Automatic stop by timer. • Access to saved files through the iOS Files app. • Autosave data when a threshold is exceeded or by timer. 4.2 10/25/2020 • For the linear scale, the algorithm for selecting the frequency range was changed. • Export of all the recent raw data. • Save of all the data. 4.1 09/02/2020 • Collecting recent data (last 10 minutes (for X, Y, Z)). • Moving over all collected data. The amplitude of the waveform can be changed in the vibration wave mode. • Changed the direction of calculating the ordinal number of points on the time scale (vibration wave mode). • Buttons for quick loading and comparing saved files. • Values of any point for logarithmic scale. 4.0 06/19/2020 • Multiple time axes for vibration wave. • List of frequency peaks. If several peaks have a common base, then they are considered as one peak. The minimum height of the peak for octave bands is 2 dB. • Interpolation of frequencies in the list of peaks. To interpolate the frequency of the peak, select the Gaussian window (the accuracy of determining the frequency can increase by 10-100 times). The calculation is not done for the extreme bins or if the adjacent bin is zero. • Calculation of the amplitude (in the list of peaks) using neighboring bins (to compensate for spectral leakage and use of the window). The number of bins used for calculation is written in brackets. • Added windows (Gaussian window and Flat top window). Removed the sine window (please let me know if you need this option). • Automatic stop in the spectrum mode. Now you can stop data collection when the start of the fading signal reaches the end of the FFT buffer. The beginning of the signal is not calculated accurately (just like with an automatic stop in the vibration wave mode). • A more detailed zoom level for the vibration wave (time scale). • Changed the FFT size range for the bluetooth accelerometer. Removed 65536 (please let me know if you need this option) and added 512. • Bug fixes. 3.3 05/03/2020 • Dark theme. • And other small features. • Bug fixes. 3.2 02/26/2020 • Root mean square (RMS, for vibration) or average value (AVG, for absolute values) for vibration wave. • Calibration of the built-in accelerometer. Need EXCLUSIVELY for measuring absolute acceleration values (gravitational acceleration). • Saving the measurement results in the application. • Selects the sampling rate of the built-in accelerometer. • Bugs fixed in the octave scale, data export (low file writing speed). • Changing the area of ​​calculation of the maximum value for a vibration wave. 3.1 09/02/2019 • FFT size (for built-in accelerometer): 64, 128, 256, 512, 1024, 2048, 4096. • Logarithmic frequency scale. • Linear frequency scale with maximum details (there is a choice for the displayed frequency range). • Values of any point (for linear frequency scale, octave bands and vibration wave (at maximum detail)). • Octave bands (1/1, 1/3, 1/6, 1/12). • Window functions (Blackman, Hamming, Hann (Hanning), Blackman–Nuttall, Sine window). • Peak hold. 3.0 07/11/2019 • Minor changes. 2.5.1 08/10/2017 • 3-axis Bluetooth accelerometer. 2.5 06/13/2017

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Previous Versions

Here you can find the changelog of Vibration analysis since it was posted on our website on 2016-09-27 05:01:15. The latest version is 4.3.14 and it was updated on 2026-06-09 14:58:22. See below the changes in each version.

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