Modular Marine Rub Rail with Segmented Shock-Absorbing Core
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Solution Overview
Problem
Existing marine vessel protection systems, such as cast urethane fenders, rigid rub rails, soft hybrid collars, and Rigid Hull Inflatable Boats, are costly, difficult to install and repair, and lack adaptability to various vessel shapes, with a need for an energy-absorbing rub rail system that is easily affixed and provides exceptional wear resistance and impact resistance.
Innovation Solution
A modular rub rail system comprising a rigid track extrusion and a resilient flexible fender extrusion with a softer shock-absorbing inner core, designed for easy attachment and removal using common tools, featuring a secure engagement mechanism without external fasteners, and made from materials like PVC and thermoplastic elastomers for optimal wear resistance and shock absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cast urethane fenders are used, then shock absorption is improved, but manufacturing cost and installation cost increase
Solution Approach 1:
The fender is divided into multiple segments that can be individually molded and assembled. This segmentation allows for standardized production of individual segments that can be manufactured more efficiently than custom molded fenders, reducing overall manufacturing cost while maintaining shock absorption performance through the segmented structure.
Solution Approach 2:
The fender uses a composite structure combining urethane material with an energy-absorbing core. This composite approach optimizes shock absorption properties while using materials and construction methods that reduce manufacturing complexity and cost compared to solid cast urethane fenders.
2Reliability
If cast urethane fenders are used, then shock absorption is improved, but installation complexity increases
Solution Approach 1:
The segmented design allows fender sections to be installed individually in a modular fashion. Each segment can be independently positioned and secured, simplifying the installation process compared to installing large custom-molded sections, while the segmented structure maintains effective shock absorption across the entire fender assembly.
3Ease of manufacture
If rigid rub rails are used, then manufacturing cost is reduced, but energy absorption capability deteriorates
Solution Approach 1:
The fender incorporates a composite structure with an energy-absorbing core surrounded by a durable urethane shell. This composite construction provides effective energy absorption during impact while using cost-efficient materials and manufacturing processes, avoiding the need for expensive rigid materials that would compromise energy absorption.
Solution Approach 2:
The fender design applies different material properties to different regions: a softer energy-absorbing core in the impact zone and a harder, more durable urethane shell on the outer surface. This local differentiation optimizes both energy absorption and manufacturing efficiency without requiring expensive materials throughout the entire structure.
4Reliability
If soft hybrid collars are used, then energy absorption is improved, but ease of retrofitting deteriorates
Solution Approach 1:
The segmented fender design allows for modular installation on existing vessels. Individual segments can be installed at different locations along the hull without requiring complete disassembly or major structural modifications, making retrofitting significantly easier than installing complete soft hybrid collar systems while maintaining energy absorption capabilities.
5Shape
If custom molded fender segments are used, then fit to vessel shape is improved, but repair difficulty increases
Solution Approach 1:
The fender is divided into multiple standardized segments that can be individually replaced. If one segment becomes damaged, only that specific segment needs to be removed and replaced, not the entire custom-molded fender assembly. This segmentation dramatically simplifies repair operations while the segments can be molded to fit various vessel shapes through standardized design variations.
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 provides durable, cost-effective, and adaptable perimeter protection for marine vessels, allowing for easy repair and replacement, while reducing damage to other structures during impacts and maintaining aesthetic appeal.
Implementation Method 1
a resilient flexible fender extrusion (3) having a softer shock absorbing inner core (4)
Implementation Method 2
made from materials like PVC and thermoplastic elastomers for optimal wear resistance and shock absorption
Data Source
Figure 1~3
Figure 4
Figure 5
AI summary
A rub rail system for a vessel including a rigid track extrusion, attached to a vessel, a resilient flexible fender extrusion, and a shock absorbing inner core, The inner core is disposed in the fender extrusion and the core is substantially softer than the fender extrusion. The fender extrusion is configured to matingly engage the track extrusion. The fender extrusion has an upper barb engaging an upper receiving cavity of the track extrusion and a lower barb engaging a lower receiving cavity of the track extrusion. The track extrusion has an upper tang engaging an upper recess of the fender extrusion and a lower tang engaging a lower recess of the fender extrusion. The track extrusion also includes an upper lip configured to engage a top portion of the perimeter of the vessel and a lower lip configured to engage a lower portion of the perimeter of the vessel.