Vibration Version 2 and Later



Vibration is a true vibration spectrum analyzer using the built in accelerometers and gyroscope inside the iPhone, iPod Touch, and iPad.  It acquires and displays time series data, optionally removes DC bias, applies a Hamming window and performs an FFT on each channel to produce frequency spectra.  The 3-channel accelerometer has a sensitivity of approximately 0.02g and a range of ±2g making the iPhone and iPod Touch sensitive enough to analyze the vibration of most vibrating machinery.  The internal gyroscope is sensitive to about 0.5 deg/sec and can also be used to analyze vibrating machinery.

In many applications Vibration can be an excellent portable alternative to a commercial spectrum analyzer.  In predictive maintenance applications Vibration can help identify bearing defects, shaft misalignment, imbalance, and structural resonant frequencies.  Vibration is also useful for monitoring the acceleration of part and material handling equipment. 

Vibration is also an excellent tool for iPod and iPhone game programmers.  The application provides an ideal way to record the output of the accelerometers for particular user actions.  This data can then be plotted offline allowing the programmer to best determine how to process the data.

The software is flexible and easy to use.  It was written to emulate the familiar oscilloscope based spectrum analyzer.  Sample rate and sample delay are easily adjustable using sliders and the user can select the length of the data acquisition and the vertical scale used for the display.  Once the settings are configured simply press the sample button.  When a test is complete the resulting data can be emailed to your desktop computer for documentation

  1. Sample data from the internal accelerometer or the internal gyroscope and starting in Version 3.00 you can sample the internal microphone or a Digiducer professional USB accelerometer.

  2. Adjustable sample rate from 10Hz to 100Hz for the internal accelerometer and gyroscope and 1 kHz to 16 kHz for the microphone and Digiducer

  3. Selectable data length from 256 to 4096 samples

  4. Variable start delay from 0 to 20 seconds

  5. Auto repeat and auto saving of data

  6. Frequency averaging and peak hold

  7. Transfer data to your computer using iTunes

  8. Adjustable vertical scale for time series data

  9. DC Remove option to get rid of that annoying gravity vector

  10. Switchable Hamming window for frequency analysis

  11. Frequency data plotted as Linear-Linear, Log-Log, Log-Linear and Linear-Log

  12. Computes rms and peak vibration for each channel and for all three channels combined

  13. Document your results by saving data and copying to your computer or sending a CSV formatted email with the time and frequency data to your computer.

  14. Turn on and off individual frequency plots

  15. Level triggering on one or more channels

  16. Calibrate your accelerometers and examine and edit the calibration data

  17. Switchable sounds to mark the start and stop of data acquisition

  18. Double tap to zoom in to examine the data

  19. Touch the screen to bring up a cursor to examine the data.  Amplitude and frequency values for the data at the cursor are reported in real time. 

USES, both serious and Fun

  1. Balance rotating machinery

  2. Measure the vibration spectrum of moving machinery to determine changes in balance due to wear

  3. Balance model helicopters

  4. Easily measure the acceleration of a vehicle during tuning and testing and then send the data to your computer for detailed analysis

  5. Quantify vehicle Vibration and Harshness

  6. Measure the vibration of your kid’s car from that annoying new sub woofer

  7. Quantitatively measure how out of balance your washer is the next time you wash that bedspread

  8. Compare the ride quality of your Volkswagen GTI and your grandfathers Buick

  9. Check the functionality of all three accelerometer axes in your iPhone/iPod

  10. Record accelerometer response to certain inputs during application programming and debugging

  11. Examine the offset and scale factors of the accelerometers in your device

Users Manual

For more information please refer to the Users Vibration Manual for V2.00 and later or Users Manual for earlier versions of Vibration.
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Diffraction Limited Design LLC

Southington, CT USA • 06489

Phone: (860) 276-0450

  Vibration Email Support

Updated January-1-2019