Notching Control and Why You Should Use It

Imagine you are testing a satellite with solar panels. It is crucial to prevent the destruction of solar panels due to resonances during the test. Notching is a tool that helps you avoid all resonances on a particular frequency by limiting the acceleration values.

Notching control allows you to run tests with limits set on the PSD or acceleration on channels.

The quickest way to get started is to place sensors on the panels and set notching limits on them. Consider the test setup shown on the photo below:

Notching control — shaker setup

The construction consists of a shaker, a spring and two sensors. Sensor 1 is connected to the top of the spring; sensor 2 is placed directly on the shaker. Sensor 2 is connected to the first input of the RL-C21 device, and sensor 1 is connected to the second input.

We begin the test with a linear. There are two peaks with acceleration about thirty times higher than acceleration at the top of the shaker.  

Notching control — Acceleration vs. Frequency test

If you apply acceleration this high to a sensitive part of a device, it will suffer significant damage. 

To avoid this, we will now specify notch limit for the second channel at 3 g level:

Notching control — setting the upper limit

Notching control — setting the upper limit in the notch table

With the notching limits set, we now see that acceleration on the second channel is now limited to about 3 g instead of 30 g, and that there is resonance on the frequencies.

Notching control — Acceleration vs. Frequency with an upper limit of 3 G

However, there is also a small gap where the acceleration on the second channel is below the limit.

Notching control — setting the lower limit

 In some cases, it is necessary to make the acceleration on the channels be above some level to avoid undertesting. To do so, we will specify the lower notch limit:

Notching control — setting the lower limit

In this test, we've set the lower limit to 0.7 g:

Notching control — setting the lower limit in the notch table

Now the acceleration on the second channel is limited to the range from 0.7 to about 3 g:

Notching control — limit range of 0.7 to 3 G

The same principle can be also applied to a Random test. Here is a picture of a Random test with a linear profile run with the same setup.

Notching control — Random control with the limit range

Now let us specify the upper limit of 0.1 g2/Hz and the lower limit of 0.007 g2/Hz. The resulting PSD plot is shown in the picture below:

Notching control — a test with the limit range of 0.1 g2/Hz to 0.007 g2/Hz

The PSD of the second channel is limited to the specified borders.

Notching is a tool that helps you avoid all resonance on a particular frequency, especially on complicated structures. However, in the case when only control channels are used, there is no need to set notching, because the drive signal accomplishes the same goal as the notch on the control channel.

If you have any questions regarding the Notching Control, contact our 24/7 technical support per email or call +371 6610 2166.

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