Vibration Isolation


Shock and Vibration Isolation

Shock and Vibration isolation lowers the transmission of shock and vibration between two interconnected objects. Passive shock and vibration isolation solutions are commonly realized by placing a set of resilient elements such as elastomeric (rubber), steel, or air springs between the two objects isolated from each other (e.g., a piece of equipment and its support structure/base).

Due to the conflicting requirements on shock and vibration isolation, passive systems are designed to be acceptable but not ideal solutions. Adjustable (Semi-active) and active shock and vibration isolation solutions such as DEICON’s Computer Controlled Air Isolation System, on the other hand, could address all the requirements/concerns of an ideal isolation scheme.

 

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Vibration Isolation

Vibration isolation schemes are to 1) reduce the propagation of support structure vibration to the isolated object (equipment) and 2) abate the transmission of vibration energy of the equipment to the support structure.

As shown in a parametric study, passive vibration isolation systems, do not address all the requirements/concerns of an ideal isolation scheme, simultaneously; their effectiveness in addressing one vibration isolation requirement is normally realized at the expense of either not being effective in or adversely affecting other vibration isolation requirements. This is also true for the more elaborate ‘two stage mounting’ (known as ‘double mounting’) scheme.

Shock Isolation

Shock perturbations are rather abrupt and thus possess energy over all frequencies. As such, they can excite all resonances in an isolated system. Therefore an ideal shock isolation system should low-pass filter the high frequency components of the shock input, transmitting only a negligible amount of shock’s high frequency energy. Considering that a soft vibration isolation system, with its low natural frequency, behaves as a mechanical low-pass filter with a low corner frequency, it would hinder the transmission of most of the high frequency components of shock inputs. However, the problem with a low frequency device is that shock inputs tend to a) excite the resonance of the isolated machine/system and b) cause large motions in the isolated device.

Semi-active and Active Isolation Systems

As an alternative to passive vibration isolation solutions, the parameters of which are fixed and can not be changed once such solutions are put in place, one can use adjustable-passive (also known as semi-active) vibration isolation schemes, such as DEICON’s Computer Controlled Air Isolation System. Such systems allow for the in-situ adjustment of the mounting parameters modifying the isolation system such that it best suits the instantaneous vibration isolation and shock isolation requirements on hand.

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In addition to the more traditional passive shock and vibration isolation solutions, DEICON offers adjustable (semi-active) and active shock and vibration isolation system.

DEICON’s vibration isolation solutions have been successfully implemented, worldwide, in various applications.

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