Low-Profile Laminated Tabletop for 2-10 Hz Vibration Damping
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Solution Overview
Problem
Conventional vibration-damped tabletops, such as those with honeycomb fillers, face challenges in maintaining a low profile while achieving sufficient weight for effective vibration isolation, leading to manufacturing difficulties and potential delamination issues that degrade vibration-damping performance.
Innovation Solution
A laminated, low-profile tabletop design featuring a metallic top skin with perforated holes and cups, bonded to a homogeneous filling material with manufactured voids, and a base metallic plate, which provides increased weight and stiffness while maintaining a thickness between 1.5 and 2.5 inches, enhancing vibration isolation and ergonomic usability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If honeycomb filler is used in conventional tabletops, then stiffness is provided and cups are accommodated, but the tabletop cannot maintain a low profile while achieving sufficient weight for effective vibration isolation
Solution Approach 1:
The patent changes the physical parameters of the filling material from hollow honeycomb structure to homogeneous solid material (such as lead-filled or dense composite material). This parameter change increases the density and weight of the tabletop while maintaining a compact thickness, achieving effective vibration isolation without requiring increased tabletop thickness
Solution Approach 2:
The patent uses composite materials by combining metallic top and bottom skins with a homogeneous filling material (such as lead, concrete, or dense polymer). This composite structure achieves both the structural integrity needed for stiffness and the mass required for vibration isolation, while maintaining a low profile that honeycomb structures cannot achieve
2Weight of stationary object
If base plate thickness is increased to meet weight requirements, then vibration isolation is improved, but manufacturing difficulty increases and delamination issues occur
Solution Approach 1:
The patent changes the approach to weight accumulation by increasing the density of the filling material rather than increasing the thickness of structural components. This allows achieving the required weight for vibration isolation while maintaining a base plate thickness that is manufacturable and reduces the risk of delamination between layers
3Ease of manufacture
If homogeneous filling material is used instead of honeycomb filler, then manufacturing ease and cost-effectiveness are improved, but stiffness provision must be maintained
Solution Approach 1:
The patent uses composite material construction with metallic top and bottom skins providing structural stiffness and strength, while the homogeneous filling material (such as lead, concrete, or dense polymer) provides mass for vibration isolation. This composite approach maintains structural stiffness while enabling easier and more cost-effective manufacturing compared to honeycomb structures
Solution Approach 2:
The patent employs homogeneous filling material throughout the tabletop core, which simplifies manufacturing processes and material selection while the metallic skins maintain structural integrity. This homogeneous approach eliminates the complexity of honeycomb fabrication while the layered composite structure preserves necessary stiffness
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
The laminated tabletop achieves superior vibration-damping performance and increased stiffness compared to honeycomb structures, with improved manufacturing ease and cost-effectiveness, maintaining effective vibration isolation within the 2 Hz to 10 Hz frequency range.
Implementation Method 1
A laminated, low-profile, vibration-damped tabletop comprises a top metallic skin perforated with a plurality of holes, a plurality of cups backing the plurality of holes and sealed to the top metallic skin, and a first homogeneous filling material bonded to the top metallic skin
Data Source
AI summary
A low-profile, vibration-damped tabletop for supporting sensitive scientific equipment is described. The tabletop may include a laminated structure having a lower metal plate that is sized to achieve a desired weight for the tabletop, a manufactured, homogenous filler and a “clean top” metal upper skin having a plurality of holes backed by liquid impermeable barriers. The damping characteristics are improved at low frequencies compared to a comparable structure with a honeycomb filler.