Isolation

Estimating Dynamic Strain in Rubber Vibration Isolators from Acceleration Measurements

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Estimating structural strain in a rubber vibration isolator from acceleration measurements is a challenging problem because elastomers behave very differently from metals. Their stiffness is strongly frequency dependent, highly temperature sensitive, and inherently viscoelastic. Nevertheless, useful engineering estimates can often be obtained from vibration measurements… Read more

MCU Isolators for Defense Vehicle Applications — MIL-STD-810 Compliance

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PORON® is a commercial polyurethane foam, Rogers Corporation Introduction Microcellular Urethane (MCU) mounts are a highly capable candidate for this application and are widely utilized for military electronics isolation. Several aerospace and defense manufacturers offer products with extensive MIL-STD-810 qualification data and field history in tactical… Read more

Equipment Racks & Earthquakes

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Seismic-restrained Isolators The following is an edited response from ChatGPT. Resonant response of the equipment rack circuit boards should not be an issue, because circuit board fundamental frequencies are typically above 200 Hz, whereas seismic energy is mostly below 20 Hz. But electronic components may… Read more

Webinar 43 – Two-degree-of-freedom System, Two-stage Isolation

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Slides: webinar_43_two_dof_systems.pptx & Alternate Link Audio/Visual File: NESC Academy Two-stage Isolation – Recommend viewing in Firefox with Sliverlight Plugin * * * Matlab script: Vibrationdata Signal Analysis Package * * * Reference Paper: two_stage_isolation.pdf & Alternate Link * * * See also:  Two-degree-of-freedom Systems * * * -… Read more

Isolator Photo Gallery

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SCUD-B Typical Avionics Component The avionics shelves were made from hardwood. The wooden fibers may provide better damping then, say, an aluminum shelf. A possible disadvantage of wood is that the shelf would be unable to serve as an electrical or thermal ground plane. The… Read more

Spring-Mass System Natural Frequency

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Here is a Matlab GUI script for calculating the natural frequency of a spring-mass system:  sdof_fn.zip It can also be used to select total isolator stiffness for a given mass and intended natural frequency. It is version 1.1, so please let me know if there… Read more

Avionics Box Isolation

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I have written some tutorials on avionics component isolation which may be downloaded at: avionics_iso.pdf six_dof_isolated.pdf * * * The Matlab GUI scripts are given in the GUI package at:  Vibrationdata Matlab GUI Package The function is accessed via: Miscellaneous > Structural Dynamics > Spring-Mass… Read more

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