Hollow Shaft Damping Insert for Lightweight Vibration Reduction
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Solution Overview
Problem
Conventional methods for reducing vibration in structural components, such as hollow shafts and struts, often increase weight by adding thickness or tuned masses, which is undesirable.
Innovation Solution
The implementation of damping devices with a tube member and damping elements configured to flex against the structural component, dissipating energy and reducing bending due to vibration, using materials like viscoelastic materials or metallic meshes, and attached via retention rings or adhesives, to minimize contact points and maintain lightweight design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional methods are used to reduce vibration (adding thickness or tuned masses), then vibration reduction is achieved, but weight increases
Solution Approach 1:
The patent employs flexible damping elements including viscoelastic materials and metallic meshes that conform to the inner surface of hollow structural components. These flexible damping layers are applied as thin films or shells that provide vibration damping through material flexibility and energy dissipation mechanisms without requiring thick structural additions, thereby reducing weight compared to conventional rigid damping methods
Solution Approach 2:
The patent utilizes composite material structures combining different damping mechanisms - viscoelastic materials for shear damping, metallic meshes for friction-based damping, and constrained layer damping configurations. These composite approaches provide effective vibration reduction through multiple physical mechanisms acting synergistically, allowing thinner overall damping layers that reduce weight while maintaining or improving damping effectiveness
2Object-affected harmful factors
If damping elements are added to reduce resonant amplitude, then vibration reduction is achieved, but device complexity increases
Solution Approach 1:
The patent extracts the damping function from complex active control systems and implements it through passive damping elements that are directly applied to the structural component. By taking out the need for sensors, actuators, and control electronics, the solution reduces device complexity while maintaining vibration reduction effectiveness through material-based energy dissipation
Solution Approach 2:
The damping elements are designed to perform multiple functions simultaneously - providing vibration damping, adhering to curved surfaces, withstanding operational temperatures, and resisting environmental degradation. This multi-functionality is achieved through carefully selected material properties and configurations that eliminate the need for separate systems for each function, thereby reducing overall device complexity
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 effectively reduces the resonant amplitude of vibrations in structural components without increasing weight, allowing for lighter-weight structural components with reduced resonant transmissibility and bending modes.
Implementation Method 1
The first and second damping elements are configured to flex against a structural component for dissipating energy from the structural component
Implementation Method 2
a spring element that is configured to clamp a friction element to an insert element to generate a frictional force to damp vibration
Data Source
AI summary
Devices, systems, and methods for damping vibration of a structural component or power-transmission shafts are disclosed. Damping devices, systems, and methods utilize a lightweight damping device, which is targeted at reducing the resonant amplitude of the first several beaming modes and/or torsional modes of bending a structural component comprising a hollow shaft or strut. The damping device includes a stiff concentric tube with damping elements disposed at each end. The device is inserted within the original structural component or shaft and attached thereto. When the primary shaft undergoes bending due to modal characteristics, the damping elements react to dissipate energy, which effectively reduces the resonant amplitude.