Modular Exhaust Flue Suspension for Low-Frequency Ship Vibration
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Solution Overview
Problem
Current vibration reduction methods in cruise ships, particularly those using elastic suspensions, are inadequate in cutting low-frequency vibrations, leading to noise and vibration transmission to adjacent structures, and often require buffer spaces that occupy valuable ship areas.
Innovation Solution
The system divides the exhaust flue components into structurally independent modules with main and secondary platforms, using high-efficiency, low-frequency main elastic suspensions to aggregate mass and reduce natural frequencies, thereby effectively cutting low-frequency vibrations without the need for buffer spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If elastic suspensions are used to reduce vibrations from exhaust flue components, then vibration transmission to the casing is reduced, but low-frequency vibrations are not effectively cut and valuable ship space is occupied by buffer spaces
Solution Approach 1:
The exhaust flue system is divided into multiple structurally independent modules (SCR module, EGB module, silencer module, etc.), each supported by its own elastic suspensions. This segmentation allows vibrations to be isolated at multiple points along the exhaust path, reducing the need for large buffer spaces while effectively cutting low-frequency vibrations through distributed isolation.
Solution Approach 2:
Elastic suspensions serve as intermediary elements between the exhaust flue modules and the support structures/casing. These suspensions (including elastomeric bodies and spring-damper systems) act as vibration isolators that specifically target low-frequency vibrations, allowing the system to reduce vibration transmission without requiring buffer spaces.
2Reliability
If heavy fume treatment plant components are installed in the casing, then emission control requirements are met, but vibrations and noise are transmitted to the ship structure
Solution Approach 1:
The heavy fume treatment components (SCR, EGB, silencers) are divided into separate modules, each with its own vibration isolation system. This allows targeted vibration control at each component location rather than requiring a single large buffer space, while maintaining full emission control functionality.
Solution Approach 2:
Elastic suspensions and vibration isolation elements are introduced as intermediary components between the heavy fume treatment plants and the ship structure. These intermediaries absorb and dampen vibrations generated by the equipment, allowing emission control systems to operate without transmitting harmful vibrations and noise to the surrounding structure.
3Object-affected harmful factors
If traditional vibration reduction methods are used, then some vibration transmission is reduced, but low-frequency vibrations penetrate through to adjacent structures
Solution Approach 1:
The vibration isolation system is designed with specific parameters optimized for low-frequency vibration control. The elastic suspensions have natural frequencies tuned below the dominant vibration frequencies of the exhaust system, creating an effective isolation barrier for low-frequency vibrations that traditional rigid supports or simple elastomeric mounts cannot achieve.
Solution Approach 2:
Advanced elastic suspension systems with optimized damping characteristics serve as intermediaries that specifically target low-frequency vibrations. These suspensions combine elastomeric materials with spring-damper mechanisms to create a vibration isolation interface that effectively cuts low-frequency vibration transmission while allowing the exhaust system to operate normally.
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
This approach significantly reduces low-frequency and ultra low-frequency vibrations transmitted to the ship's structure, freeing up valuable space and maintaining similar production costs to traditional solutions.
Implementation Method 1
main elastic suspensions (61) of each main platform (51) are sized to cut the transmission... of low-frequency vibrations... exploiting the total mass of said respective module (50a-50e)
Implementation Method 2
The vibration isolators are designed to reduce the natural frequency of the system, allowing the system to operate below resonance frequencies and reduce vibration transmission
Data Source
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AI summary
The invention relates to a ship (1), comprising: at least one casing (20) that delimits a cavity (21) extending vertically across the ship's decks (10); - at least one exhaust flue (30) that is installed inside said casing and comprises a plurality of concentrated mass components (31, 32, 33, 34) and a plurality of components with mass distributed in length (35; 36); - a plurality of structures (51, 52, 53) that support the plurality of said components inside the casing (20). Said support structures comprise: - a plurality of main platforms (51), each of which defines a main support base inside said cavity (21) and is connected to walls of the casing (20) at a ship deck (10) by means of the interposition of main elastic suspensions (61); and - a plurality of secondary platforms (52), each of which is directly or indirectly supported only by one of said main platforms (51) and defines a secondary support base arranged at a different height with respect to the main support base that is defined by the corresponding main platform (51). At least one of said concentrated mass components (31, 32, 33, 34) is positioned on each main platform (51) . The assembly consisting of a main platform (51), the corresponding at least one concentrated mass component (31, 32, 33, 34), one or more possible secondary platforms (52) supported by said main platform and one or more components with mass distributed in length (35; 36) connected to said main platform (51) and/or to said one or more possible secondary platforms (52) constitutes a structurally independent module (50a, 50b, 50c, 50d, 50e). The main elastic suspensions (61) of each main platform (51) are sized so as to cut the transmission - from the respective modules (50a, 50b, 50c, 50d, 50e) to the casing (20) - of low-frequency vibrations that are generated by said engines and are transmitted inside the casing (20) by said exhaust flue (30), exploiting the total mass of said respective modules (50a, 50b, 50c, 50d, 50e). [Fig.4]