Shock and Vibration Symposium 2019 - Atlanta, GA

Crystal Instruments and Sentek Dynamics attended the 90th Shock and Vibration Symposium in Atlanta, GA.  Topics covered at the symposium included shock-ship testing, water shock, weapons effects (air blast, ground shock, cratering, penetration) shock physics, earthquake engineering, structural dynamics, and shock and vibration instrumentation and experiment techniques.

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Crystal Instruments EDM 8.1 Release

Crystal Instruments is pleased to announce the release of EDM 8.1, the most advanced featured version of Engineering Data Management software. With this new release, advanced new products have been added to the Crystal Instruments’ family of products along with exciting new features across all EDM modules. Improvements to existing features and bug fixes make this release more user-friendly and robust.

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Pizza Reliability

Everything goes well with pizza, or so it seems, and the list of things that go well with pizza now include vibration test equipment, thanks to companies like Zume Pizza.  Zume Pizza in Mountain View, California, has innovated pizza delivery; they bake each pie in their mobile kitchens and are able to move those kitchens to the demanded location (i.e. sporting events, concerts, schools). The pizza is delivered to your doorstep moments after it comes out of the oven.

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Modal Space - In Our Own Little World

Is it really necessary to reject a double impact?

Are they really a problem?

Let's talk about this.

I know that many people will say that a double impact is totally unacceptable. It is not the optimum condition for collecting impact data for a modal test. However, under certain circumstances, it may be reasonable to accept a measurement that has resulted from a double impact. Let's discuss this problem that may arise when a double impact occurs and explain how to determine if the measurement is acceptable or not.

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Crystal Instruments Sponsors 2019 SAE Noise and Vibration Conference

The Society of Automotive Engineers (SAE) held the 2019 Noise and Vibration Conference in Grand Rapids Michigan this year.  The conference, which is a biennial event, took place from June 10th to the 13th and drew roughly 1,000 engineers focused on NVH (Noise, Vibration and Harshness) and sound quality measurements. Crystal Instruments was proud to take part in sponsoring the conference this year.

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Modal Space - In Our Own Little World

I ran one test with an x-excitation and can see some modes and another test with a y-excitation and see some different modes. Could I use an oblique angle instead?

Well, that's a very good question. Its one that comes up often in terms of running modal tests with a shaker excitation. Of course it is totally acceptable to run one test with a shaker at some oblique angle to the structure. But the only thing we need to be careful about is to assure that we don't select the reference point at the node of a mode.

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