How to Design a Good Vibration Sensor Enclosure Using Modal Analysis by: Richard Anslow, System Applications Engineer

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A well-constructed mechanical enclosure design for a MEMS accelerometer will ensure that high quality vibration data for CbM is extracted from the monitored asset. The mechanical enclosure used to house a MEMS accelerometer needs to have a frequency response better than the integrated MEMS. This article uses modal analysis to provide the natural frequencies
possible with enclosure designs. Guidance on vibration sensor design is provided using theoretical and ANSYS modal simulation examples. It is shown that geometry effects, such as enclosure shape (such as a cylinder or a rectangle), and height dominate the natural frequencies in enclosure design. Mechanical design examples are provided for housing single-axis and triaxial MEMS accelerometers with 21 kHz resonant frequency. This article also provides guidance on epoxy integration in enclosures, as well as cable installation and mounting options for sensors.

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