Modular Bulbous Bow Using 3D Printing for Cost Reduction

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Solution Overview

Problem

Existing bulbous bow designs for sea-going vessels are complex and costly to manufacture and maintain, with high production costs and limited flexibility in hydrodynamic performance and repair, which does not effectively address the need for efficient fuel consumption and easy maintenance.

Innovation Solution

The use of rapid prototyping techniques, such as 3D printing, to create modular, interchangeable bulbous bow components with welded frames and foam layers, allowing for efficient production and easy replacement, enabling optimal hydrodynamic performance and reducing manufacturing costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If traditional metal cutting and hammering methods are used to manufacture bulbous bow double curved surfaces, then structural strength and durability are improved, but manufacturing complexity and cost increase significantly

Engineering Contradiction:

Improvestructural strengthVSAvoidmanufacturing complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The patent replaces traditional mechanical cutting and hammering methods with 3D printing technology to manufacture the bulbous bow. This substitution eliminates complex manual metalworking processes while maintaining structural integrity through additive manufacturing, directly resolving the contradiction between strength and manufacturing complexity

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent employs composite material construction by combining 3D printed outer shell structures with internal reinforcement frameworks. This composite approach achieves the required structural strength while simplifying manufacturing, as the 3D printing process can directly create complex geometries that would otherwise require multiple manual operations

Inventive Principle:

Principle #40Composite materials

2Strength

If traditional welded metal construction methods are used for bulbous bow attachment, then structural integrity is improved, but manufacturing cost and complexity increase

Engineering Contradiction:

Improvestructural integrityVSAvoidmanufacturing cost

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

The patent replaces traditional welding processes with 3D printing technology for constructing the bulbous bow attachment system. This substitution eliminates costly welding inspections and complex preparation processes while maintaining structural integrity through integrated 3D printed components that incorporate attachment features directly into the design

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent divides the bulbous bow system into modular segments including the outer shell, internal framework, and attachment components. This segmentation allows each component to be manufactured separately using 3D printing, reducing overall manufacturing complexity and cost while maintaining structural integrity through precise digital assembly plans

Inventive Principle:

Principle #1Segmentation

3Device complexity

If fixed bulbous bow design is used, then structural simplicity is maintained, but adaptability to different vessel loads and conditions is reduced

Engineering Contradiction:

Improvestructural simplicityVSAvoidadaptability to vessel loads

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The patent creates a dynamic bulbous bow system where the outer shell can be selectively attached or detached from the internal framework. This dynamic configuration allows the same basic structure to adapt to different vessel loads and operating conditions by adjusting which shell components are activated, maintaining relative structural simplicity while achieving high adaptability

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent designs a universal internal framework that can support multiple different outer shell configurations. This universal base structure provides the same attachment interface and structural support regardless of which shell components are installed, enabling the system to serve multiple functions for different vessel loads without requiring completely different structural designs

Inventive Principle:

Principle #6Universality (Multi-functionality)

4Object-affected harmful factors

If heavy detachable bulbous bow design is implemented, then collision damage absorption is improved, but manufacturing cost and replacement complexity increase

Engineering Contradiction:

Improvecollision damage absorptionVSAvoidmanufacturing cost

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The patent employs thin-walled 3D printed shell structures that provide adequate collision damage absorption through their geometric design rather than material thickness. These thin-walled structures are lighter and less expensive to manufacture while maintaining the necessary energy absorption capabilities during collision, resolving the contradiction between damage absorption and manufacturing cost

Inventive Principle:

Principle #30Flexible shells and thin films

Data Source

PatentUS9926041B2Bulbous bow, a sea-going vessel with such bow, and methods of its manufacture

Publication Date: 2018.03.27 OPTIBULB IVS

AI summary

The present invention concerns a bulbous bow for a sea-going vessel, said bow comprising a load-carrying inner structure mounted at the stem of the vessel and an outer shell structure defining the hydrodynamic properties of the bulbous bow, wherein said outer shell structure is provided with a sub-structure for replaceably mounting on the inner structure. The invention further concerns a seagoing vessel comprising such bulbous bow as well as a method of producing a bulbous bow and a method of mounting or replacing a bulbous bow.