Isolation Mount Double Shear Pad for Vibration Attenuation
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Solution Overview
Problem
Current dampening systems fail to effectively attenuate vibrations across both low and high frequency ranges while minimizing angular rotations, which is crucial for sensitive instrumentation in environments like space applications.
Innovation Solution
The isolation mount system consists of an outer and inner mounting with an elastomer-based isolation pad providing damping between them, configured to surround a central axis with a central portion closer to the axis than the ends, allowing for double shear damping and minimal angular rotations, and attaches via radial and axial bolt patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current dampening systems are used, then vibration attenuation is achieved in either low or high frequency ranges, but attenuation across both low and high frequency ranges simultaneously cannot be achieved
Solution Approach 1:
The isolation pad is divided into multiple regions with different material properties: a first region with first material properties for low frequency attenuation and a second region with second material properties for high frequency attenuation. This segmentation allows the single isolation pad to provide broad frequency range coverage by addressing different frequency bands through different material zones.
Solution Approach 2:
Different regions of the isolation pad are assigned different material properties tailored to specific frequency ranges. The first region contains material optimized for low frequency vibration attenuation while the second region contains material optimized for high frequency attenuation, allowing each local region to perform its specialized function effectively.
2Reliability
If vibration attenuation is achieved, then equipment isolation is improved, but angular rotations of the equipment increase beyond acceptable limits
Solution Approach 1:
The isolation pad features an asymmetric geometry where the first region has a greater thickness than the second region. This asymmetric thickness distribution creates different stiffness characteristics in different directions, allowing the pad to attenuate vibrations effectively while limiting angular rotations to acceptable levels by providing directional support.
3Reliability
If vibration attenuation across wide frequency spectrum is achieved, then attenuation performance is improved, but device complexity increases
Solution Approach 1:
Multiple material regions with different attenuation properties are merged into a single integrated isolation pad structure. This consolidation allows the system to achieve broad frequency range attenuation performance while avoiding the complexity of multiple separate isolation components, as all functional regions are combined in one element.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration achieves a minimum of 10 dB attenuation above 20 kHz, maintains stability in resonant modes between 300 and 500 Hz, and allows for minimal equipment rotations, ensuring effective vibration isolation in both low and high frequency ranges with minimal space constraints.
Implementation Method 1
an isolation pad between the inner mounting and the outer mounting, the isolation pad providing damping between motions of the inner mounting and the outer mounting
Implementation Method 2
the isolation pad provides damping between motions of the inner mounting and the outer mounting, providing a minimum attenuation of 10 dB in frequencies above 20 kHz
Data Source
AI summary
An isolator mount system (10) includes multiple isolator mounts (22) that are used to isolate a piece of equipment from a structure. The isolation mounts each include an isolation pad (36) between inner and outer mountings (30), to provide damping between relative motions of the inner mounting and the outer mounting. A central portion of the isolation pad is closer to a central axis of the isolation mount than are ends of the isolation pad that are on opposite sides of the central portion. This configuration provides two shear sections, to provide additional damping, an additional amount of shear in the isolator mounts. The shear sections may be configured to control location of the center of elasticity of the system, for example by locating the center of elasticity at the same location as the center of gravity of the system, thereby resulting in an isoelastic system.