Dual-Damped Ship Ceiling Structure for Shock Wave Decoupling
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Solution Overview
Problem
Existing ceiling systems in naval vessels are prone to severe damage and potential injury from shock waves due to differential movement between wall and ceiling panels and the surrounding structure during a direct hit, causing collisions and structural damage.
Innovation Solution
A ceiling system with a dual vibration damping unit, comprising a first unit with higher spring stiffness and damping to absorb shock loads and a second unit to decouple the ceiling panel from the supporting element, ensuring minimal relative movement under normal conditions and rapid damping of vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If ceiling panels are rigidly connected to wall panels and bulkheads, then structural stability is improved, but shock resistance deteriorates due to differential movement during shock waves
Solution Approach 1:
The patent applies the dynamics principle by replacing rigid connections with dynamic vibration damping units that allow controlled movement. The ceiling panel is connected to the bulkhead via a first vibration damping unit with specific spring stiffness and damping characteristics, enabling the system to adapt its rigidity based on operational conditions - rigid during normal operation, flexible during shock events.
Solution Approach 2:
The patent implements parameter changes by carefully selecting and adjusting the spring stiffness and damping coefficients of the vibration damping units. The first vibration damping unit has higher spring stiffness and damping than the second unit, creating a graduated flexibility that allows the system to maintain stability while accommodating shock-induced differential movements between panels with different damping characteristics.
2Strength
If vibration damping units with high spring stiffness are used, then shock load absorption is improved, but normal operation vibrations increase
Solution Approach 1:
The patent applies segmentation by dividing the vibration damping function into two separate units with different characteristics. The first vibration damping unit (with higher spring stiffness and damping) handles shock loads between the ceiling structure and bulkhead, while the second vibration damping unit (with lower spring stiffness and damping) handles vibrations between the ceiling panel and supporting element during normal operation. This segmentation allows each unit to be optimized for its specific function.
Solution Approach 2:
The patent implements local quality by assigning different damping characteristics to different parts of the system. The first vibration damping unit located at the bulkhead connection has higher stiffness and damping for shock resistance, while the second unit closer to the ceiling panel has lower stiffness and damping to minimize operational vibrations. Each location receives the specific damping quality appropriate for its functional requirements.
3Reliability
If multiple vibration damping units with different characteristics are used, then shock resistance and vibration control are improved, but device complexity increases
Solution Approach 1:
The patent uses an intermediary approach by introducing a supporting element as an intermediate component between the ceiling panel and the first vibration damping unit. This supporting element simplifies the connection architecture and allows the two vibration damping units to be implemented in a straightforward, modular manner, reducing overall system complexity while maintaining the benefits of differentiated damping characteristics.
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 system effectively prevents collision and damage to the ceiling and surrounding structures by absorbing high accelerations and damping vibrations, enhancing longevity and reducing noise emissions.
Implementation Method 1
a first vibration damping unit, which movably connects the supporting element to the deck in the vertical and horizontal directions, which has a first vertical spring stiffness and a first vertical damping
Implementation Method 2
a first vibration damping unit, which movably connects the supporting element to the deck in the vertical and horizontal directions, which has a first vertical spring stiffness and a first vertical damping
Implementation Method 3
a second vibration damping unit, which movably connects the ceiling panel to the supporting element in the vertical direction and which has a second vertical spring stiffness and a second vertical damping
Implementation Method 4
a second vibration damping unit, which movably connects the ceiling panel to the supporting element in the vertical direction and which has a second vertical spring stiffness and a second vertical damping
Data Source
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AI summary
Shock-resistant ceiling system which is fastened to a deck of a ship, comprising a support element arranged below the deck, a flat ceiling panel arranged below the support element and extending parallel to the deck, a first vibration damping unit which connects the support element to the deck in a vertically movable direction and which has a first vertical spring stiffness and a first vertical damping, a second vibration damping unit which connects the ceiling panel to the support element in a vertically movable direction and which has a second vertical spring stiffness and a second vertical damping, wherein the first spring stiffness is higher than the second spring stiffness, the first damping is higher than the second damping.