Water-Entry Deceleration Platform for Large Payload Impact Control
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Solution Overview
Problem
Existing payload delivery systems into aquatic environments face challenges with large payloads, as they either fail to adequately distribute impact forces, leading to damage or destabilization, particularly in rough waters, due to limitations in size and mass handling.
Innovation Solution
A deceleration platform with an upper flexible support and a lower flexible sheet, configured to displace fluid laterally upon impact, distributing impact forces and providing shock absorption, supported by a rigid frame, allowing for larger payloads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional flat platform is used for payload delivery, then the platform structure is simple, but the impact forces are not adequately distributed leading to payload damage or destabilization
Solution Approach 1:
The platform is divided into multiple functional elements: a rigid frame structure, an upper flexible support system with multiple attachment points, and a lower flexible deceleration sheet. This segmentation allows different parts to perform specialized functions - the frame provides structural integrity, the upper flexible support distributes payload attachment forces, and the lower sheet manages water impact forces independently.
Solution Approach 2:
Different regions of the platform are given different mechanical properties: the frame is rigid for structural strength, the upper flexible support has controlled flexibility for shock absorption at payload attachment points, and the lower flexible sheet has specific flexibility characteristics for water impact deceleration. This local differentiation of material and structural properties optimizes each region's performance for its specific function.
2Quantity of substance
If the payload size is increased beyond platform design limits, then the payload capacity is improved, but the platform may not effectively reduce impact forces and the payload may destabilize or capsize
Solution Approach 1:
The platform incorporates dynamic elements that adapt to payload size and impact conditions. The flexible upper support and lower deceleration sheet can deform and adjust their stiffness characteristics based on the magnitude of forces applied, allowing the platform to effectively handle a wider range of payload sizes while maintaining reliable impact force reduction.
Solution Approach 2:
The platform uses composite construction combining rigid frame materials (such as aluminum or composite tubes) with flexible support materials (such as webbing, ropes, or elastic elements). This composite approach allows the structure to simultaneously provide the strength needed for larger payloads while maintaining the flexibility required for effective shock absorption and impact force reduction.
3Strength
If rigid rigging is used to secure payload, then the attachment strength is improved, but the rigging may damage portions of the payload not designed to be load-bearing
Solution Approach 1:
The upper flexible support system uses flexible elements such as webbing straps, ropes, or elastic bands instead of rigid rigging. These flexible elements can conform to the payload surfaces they contact, distributing loads across broader areas and avoiding concentration of forces on small, potentially vulnerable points of the payload structure.
Solution Approach 2:
The flexible support elements act as intermediaries between the rigid frame structure and the payload. They provide a compliant interface that translates rigid structural forces into flexible, distributed contact forces on the payload, preventing damage while maintaining secure attachment.
4Speed
If the platform impacts rough water directly, then the deceleration is rapid, but the force transmitted to the payload is considerable causing potential damage
Solution Approach 1:
The lower flexible deceleration sheet is positioned and configured to contact the water surface before the main payload support structure experiences full impact forces. This element acts as a preliminary cushion that begins the deceleration process early in the water entry sequence, gradually reducing the rate of force transmission to the payload.
Solution Approach 2:
The flexible deceleration sheet changes its effective stiffness and deceleration characteristics during the water impact process. As it penetrates the water, the sheet's deformation and fluid interaction dynamically adjust the deceleration profile, transitioning from initial rapid deceleration to a more controlled, extended deceleration sequence that reduces peak forces on the payload.
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 platform effectively decelerates larger payloads by distributing impact forces, reducing damage and ensuring stable delivery even in rough waters, through the use of a flexible support and sheet configuration.
Implementation Method 1
a lower flexible sheet having a cross-sectional shape which is configured to displace fluid (i.e., the water into which the platform is delivered) laterally on entry of the deceleration platform to the water to decelerate the deceleration platform
Data Source
AI summary
A deceleration platform for aerial delivery of pay loads into water is described. The deceleration platform comprises an upper flexible support for supporting a payload and a lower flexible sheet having a cross-sectional shape which is configured to displace fluid (i.e., the water into which the platform is delivered) lateraly on entry of the deceleration platform to the water to decelerate the deceleration platform. A rigid frame supports the upper flexible support and the lower flexible sheet, with the upper flexible support being aranged above the lower flexible sheet. A rigging spreader apparatus for securing a payload to a deceleration platform is also described.