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Swept sine vibration test

swept sine vibration test

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Military Standards (free for download, mIL-STD-810G (Method 513 mIL-STD-202 (Methods 201, 204) http quicksearch.When it comes to vibration testing there are two popular types to consider: sine and random.Time waveform plot (bottom).The first technique sweeps through a range of frequencies in a manner similar to a chirp.Random vibration test frequency plot (top).Sine vibration test frequency plot (top). On an electronic module the circuit boards are often the main resonant structures and typically their fatigue conditions are most important to understand.The phase of the FRF is equivalent to the phase lag introduced by the DUT for each test frequency.By recording the in-situ vibration environment with an accelerometer or multiple accelerometers a random power spectral density plot can be created and run at the level recorded or increased to accelerate fatigue and shorten test time.The second technique steps through a range of frequencies.Since the stimulus is a single tone, swept-sine analysis can measure the harmonic distortion while simultaneously measuring the linear response.Org automotive Electronics (download fee).The most effective vibration test to run is one based on actual field measurements of the specific environment where a product will be operated. .The majority of vibration environments where devices are mounted, especially electronic devices, are characterized as having predominantly random vibration conditions.If the measured vibration environment has sinusoidal characteristics then the random vibration profile can also be tailored to include sine tones applied over the random vibration background.The following front panel shows an example of the excitation signal for a sweeping swept-sine measurement.Swept-sine measurements require a signal source.