Inflatable Fender Stiffening via Appendage Pressure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Flexible suspension links on textile boat fenders detach under repetitive and violent traction forces, compromising the mechanical resistance and safety of the fender during boat movements.
Innovation Solution
An inflatable fender design with a stoppered end stub and a textile outer casing equipped with D-ring securing means, where the inflatable appendage is secured on the neck of the casing, providing stiffness and concentrating mechanical forces, preventing detachment and ensuring secure suspension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If flexible suspension links are used on textile fender, then the fender can be easily manufactured and installed, but the suspension links detach under repetitive and violent traction forces
Solution Approach 1:
The fender is divided into separate inflatable cells that are connected in series, with each cell having its own suspension link attachment points. This segmentation allows the suspension links to be distributed across multiple attachment points rather than concentrated at a single point, reducing the stress on individual links and preventing detachment while maintaining ease of manufacture.
Solution Approach 2:
The fender uses an inflatable structure that can dynamically adjust its rigidity and shape in response to applied forces. When traction forces are applied, the inflatable structure maintains its form and distributes the forces evenly across its surface and attachment points, preventing the concentration of stresses that would cause flexible suspension links to detach.
2Ease of operation
If suspension links are secured on the upper part of the fender, then the fender can be suspended, but the repetitive traction forces cause detachment and compromise mechanical resistance
Solution Approach 1:
The suspension links are pre-attached to the inflatable structure during manufacturing, with reinforcement elements already in place at the attachment points. This preliminary action ensures that the attachment points are strengthened before use, preventing detachment under operational traction forces while maintaining ease of suspension.
Solution Approach 2:
The fender uses composite construction combining the inflatable structure with reinforcement elements at the suspension link attachment points. This composite approach creates a hybrid structure that maintains flexibility and ease of operation while providing the enhanced mechanical resistance needed to prevent detachment under repetitive traction forces.
3Adaptability or versatility
If the fender uses a textile casing with flexible suspension links, then the fender is flexible and adaptable, but the mechanical resistance is compromised under intensive vertical traction forces
Solution Approach 1:
The inflatable structure provides dynamic adaptability, allowing the fender to adjust its shape and rigidity in response to different operational conditions. The inflation pressure can be adjusted to optimize both the adaptability to various dock configurations and the mechanical resistance to traction forces, resolving the contradiction between flexibility and strength.
Solution Approach 2:
The fender employs local reinforcement at the suspension link attachment points while maintaining the overall flexibility of the textile casing. This localized strengthening provides the necessary mechanical resistance at critical points without compromising the global adaptability and flexibility of the fender structure.
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 design enhances the mechanical resistance and safety of the fender by distributing traction forces effectively, preventing detachment and ensuring the fender remains securely attached to the boat, making it safe and efficient for protecting the hull from impacts.
Implementation Method 1
Once the appendage inflated, the neck where the suspension links are secured stiffens. The pressure effect of the assembly allows the permanent tensioning of the threads or the mesh of the wall of the neck where the suspension links are secured.
Data Source
AI summary
Inflatable fender having an inflatable first, internal, casing provided at least at one end in the continuation of the chamber with an inflatable tubular appendage (3) equipped with a stoppered end stub (2), this assembly being housed inside an external second casing (5) that hugs the first casing and the appendage (3) and being equipped, at the neck hugging the appendage, with at least one pair of fixings (9) of the D-ring type.