Granular Sphere Damper for Broadband Pole Vibration Absorption
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Solution Overview
Problem
Existing solutions for vibration dampening in vertical structures like light poles are inadequate in effectively managing vibrations near natural frequencies, leading to fatigue failures due to limited energy dissipation and lack of robustness in addressing various modes of vibrations.
Innovation Solution
A closed housing with a dampening sphere and internal baffling, which includes energy-absorbing particles and a curved surface for frequency tuning, provides effective energy absorption and vibration dampening by converting kinetic energy into friction and impact dissipation within the sphere.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If weights or solid balls are used to impact damper chamber walls for energy dissipation, then vibration dampening is provided, but the energy dissipation is limited to impact only and is insufficient for effective dampening
Solution Approach 1:
The invention changes the energy dissipation mechanism from simple impact to friction-based energy dissipation by using granular material. The granular material particles rub against each other during relative motion, converting vibrational energy into heat through friction, which significantly enhances energy dissipation effectiveness compared to impact-only mechanisms.
Solution Approach 2:
The invention uses a composite approach by combining granular material particles with the damper chamber structure. The granular material (such as sand, gravel, or shot) creates multiple interaction surfaces and friction zones within the chamber, transforming a simple mass damper into a composite energy dissipation system that combines impact and friction mechanisms.
2Loss of energy
If granular material is used to dissipate energy through friction and impact, then energy dissipation is improved, but the solution is not effectively applied to pole structures with translational vibration
Solution Approach 1:
The invention adapts the granular material energy dissipation mechanism to work effectively with pole structures experiencing translational vibration. The damper chamber is designed to accommodate pole movement while maintaining granular material contact and friction, making the energy dissipation mechanism versatile for different vibration modes including translational, rotational, and combined motions.
Solution Approach 2:
The invention creates a dynamic interaction between the granular material and the moving pole structure. The granular material particles are free to move and reconfigure within the chamber, allowing the system to adapt to varying vibration frequencies, amplitudes, and directions, thereby providing effective dampening across different operational conditions.
3Reliability
If a mass damper with specific stiffness tuning is used, then dampening at a particular frequency is achieved, but dampening of various modes of vibrations across a range of frequencies is limited
Solution Approach 1:
The invention changes from a fixed stiffness mass damper to a granular material-based system where the effective stiffness and damping characteristics can vary with vibration frequency, amplitude, and direction. The granular material's frictional properties provide broadband energy dissipation that adapts to different vibration modes without requiring precise frequency tuning.
Solution Approach 2:
The invention uses granular material as a composite damping medium that combines mass, friction, and impact mechanisms. This composite approach provides energy dissipation across a broad frequency range and for multiple vibration modes, overcoming the limitation of single-frequency tuning in traditional mass dampers.
4Reliability
If traditional vibration dampening solutions are applied to light poles, then some vibration reduction is achieved, but fatigue failures still occur due to insufficient energy dissipation
Solution Approach 1:
The invention fundamentally changes the energy dissipation parameter by introducing friction-based dissipation through granular material. This increases the energy dissipation rate significantly compared to traditional impact-only dampers, thereby reducing the amplitude and duration of vibrations that cause fatigue in light pole structures.
Solution Approach 2:
The invention employs granular material as a composite energy dissipation medium within the damper chamber, creating multiple friction interfaces and energy dissipation pathways. This composite approach enhances the overall energy dissipation capacity, providing sufficient dampening to prevent fatigue failures in vertically oriented structures like light poles.
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
The solution effectively reduces vibrational energy through kinetic energy conversion and friction, providing robust and practical dampening across different types of structures and vibrational modes, minimizing fatigue failures and enhancing structural stability.
Implementation Method 1
energy-absorbing particles and a curved surface for frequency tuning, provides effective energy absorption and vibration dampening by converting kinetic energy into friction and impact dissipation within the sphere
Implementation Method 2
converting kinetic energy into friction and impact dissipation within the sphere
Implementation Method 3
the closed housing may preferably include an internal, curved surface which provides an effective stiffness or restoring force that enacts the frequency tuning of the tuned mass damper
Data Source
AI summary
The present invention provides a method and apparatus for energy absorption and vibrational dampening when attached to a vertical or horizontal structure. According to a first preferred embodiment, the present invention includes a closed housing which may preferably include an internal, curved surface. According to a further preferred embodiment, the present invention may include at least one dampening weight or sphere which may preferably be disposed within the closed housing. According to a further preferred embodiment, the dampening sphere may include internal baffling such as particles having resistance to the flow of the particles within the closed housing.