Fin Stabilizer Mounting With Vibration-Damping Hull Decoupling
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Solution Overview
Problem
Existing fin stabilizers in watercraft transmit vibrations and structural loads, causing stress and noise, particularly in large vessels, and require precise mechanical transmissions.
Innovation Solution
A fin stabilizer design with a vibration damping element positioned between the drive-side mounting portion and the hull-side attachment portion, decoupling them physically and using materials with different hardness to absorb vibrations and reduce noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If mechanical transmissions are used to reduce motor speed and increase torque, then the required output speed and torque are achieved, but vibrations are introduced into the ship's hull wall causing stress and structure-borne noise
Solution Approach 1:
The patent introduces a vibration damping element as an intermediary component between the drive actuator and the stabilizer fin. This damping element absorbs and attenuates vibrations generated by the mechanical transmission, preventing their direct transmission into the ship's hull wall while still allowing the transmission to deliver the required torque.
Solution Approach 2:
The patent extracts the vibration damping function from the structural connection and creates a separate, dedicated vibration damping element. This separation allows the mechanical transmission to focus on torque delivery while the damping element independently handles vibration absorption.
2Power
If mechanical transmissions are used to achieve high output torque, then the torque requirements are met, but the precision of alignment, component manufacture, and installation is compromised due to external loads
Solution Approach 1:
The vibration damping element serves as a protective intermediary that isolates the precision components of the mechanical transmission from external loads and vibrations. This protection allows the transmission components to maintain their alignment precision and manufacturing tolerances even under high torque conditions.
Solution Approach 2:
The patent implements beforehand cushioning by pre-installing the vibration damping element to protect the mechanical transmission from external loads before they can affect the precision components. This preventive measure ensures that alignment and manufacturing precision are maintained throughout operation.
3Device complexity
If the mounting portion is directly connected to the attachment portion, then the structure is simpler and more rigid, but vibrations are directly transmitted into the ship's structure
Solution Approach 1:
The vibration damping element is inserted as an intermediary between the mounting portion and attachment portion, creating a decoupled connection that interrupts the direct transmission path for vibrations while maintaining the structural connection necessary for force transmission.
Solution Approach 2:
The vibration damping element functions as a flexible coupling that allows the mounting structure to remain relatively simple while introducing compliance to the connection. This flexibility absorbs vibrations without requiring complex rigid structures.
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
Reduces vibration transmission and structural noise, ensuring reduced loads on components and maintaining operational safety with redundancy in vibration damping elements.
Implementation Method 1
at least one of the parts has vibration-damping properties
Data Source
AI summary
A fin stabilizer is provided for roll stabilization of a watercraft. The fin stabilizer includes a drive unit connected in a vibration-damping manner to a ship's structure. Specifically, a vibration damping element is provided between the drive unit and the hull of the watercraft wall such that a mounting portion of the drive unit is spaced from an attachment portion of the hull wall.