Heat-Transfer Tube Bundle Damping Structure for In-Plane Vibration
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Solution Overview
Problem
Conventional vibration damping structures for heat-transfer tube bundles are ineffective in suppressing in-plane vibrations due to insufficient contact force, which can lead to wear and reduced damping performance, especially when manufacturing errors and fluid-induced vibrations occur.
Innovation Solution
The proposed vibration damping structure employs first and second vibration damping members with larger thicknesses than the average clearance, positioned at different axial locations to apply a controlled contact force through bending deformation, ensuring effective suppression of in-plane vibrations and maintaining performance despite wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness of the vibration damping member is increased to apply contact force to suppress in-plane vibration, then vibration damping performance is improved, but manufacturing precision requirements increase and wear resistance becomes problematic
Solution Approach 1:
The invention changes the thickness parameter of the vibration damping member to be larger than the tube clearance, enabling it to apply contact force to tubes in the in-plane direction. This parameter change allows the member to effectively suppress vibration while accounting for manufacturing tolerances through its increased dimensional tolerance capacity.
Solution Approach 2:
The vibration damping member is designed with sufficient thickness to preemptively accommodate wear over time. By initially setting the thickness larger than the clearance, the member maintains adequate contact force even after wear occurs, ensuring long-term vibration damping performance without requiring precise thickness control.
2Ease of manufacture
If the thickness of the vibration damping member is set equal to or slightly smaller than tube clearance, then manufacturing is easier, but contact force becomes insufficient and in-plane vibration cannot be suppressed
Solution Approach 1:
The invention fundamentally changes the thickness parameter from being equal to or smaller than clearance to being larger than clearance. This parameter change enables the member to protrude into the tube and apply sufficient contact force for in-plane vibration suppression, while still maintaining ease of manufacture through simple geometric forms.
3Productivity
If manufacturing errors are present in vibration damping members, then production cost is reduced, but appropriate contact force cannot be ensured and vibration damping performance deteriorates
Solution Approach 1:
By increasing the thickness parameter beyond the clearance dimension, the invention creates a design with inherent tolerance capacity. This allows manufacturing errors to exist without compromising the ability to maintain appropriate contact force, thereby enabling higher productivity without sacrificing reliability.
Solution Approach 2:
The oversized thickness design preemptively compensates for manufacturing variations and wear. By building in excess material, the system ensures that even with production errors, sufficient contact force is maintained throughout the component's service life, eliminating the need for tight manufacturing tolerances.
4Duration of action of stationary object
If the vibration damping member thickness is increased to account for wear, then long-term performance is maintained, but initial device complexity increases
Solution Approach 1:
The invention extends the service life by setting the thickness parameter larger than the clearance, creating a design that naturally accommodates wear over time. This simple parameter adjustment maintains long-term performance without adding structural complexity or requiring additional components.
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 configuration allows for precise adjustment of contact force to suppress in-plane vibrations and maintains damping performance even with wear, providing effective vibration control with a simple and cost-effective design.
Implementation Method 1
adjusting the thickness of the vibration damping member disposed in the clearance between the tubes so as to suppress the vibration phenomenon in the in-plane direction
Data Source
AI summary
A vibration damping structure for a heat-transfer tube bundle including columns arranged at an interval and each composed of a plurality of heat-transfer tubes curved in a common plane and arranged in parallel to each other. The vibration damping structure includes a first vibration damping member and a second vibration damping member disposed between the columns so as to intersect the array direction of the columns. The first vibration damping member and the second vibration damping member are disposed at different positions in an axial direction of each heat-transfer tube, and thicknesses of the first vibration damping member and the second vibration damping member in the array direction are larger than an average value of a clearance between the columns under operation.