Impact Damping Arrangement for Low-Mass Oscillation Reduction
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Solution Overview
Problem
Existing methods for reducing oscillations in structures, such as those found in motors, turbines, and construction, often require significant additional masses or complex systems, which can be impractical due to geometric limitations and are not always effective in minimizing oscillation amplitudes.
Innovation Solution
An oscillation-reducing device with a housing and body that makes impact contacts within a cavity, where the body's mass is significantly smaller than the structure's modal mass, and the clearance for movement is optimized to reduce oscillation amplitudes through elastic impacts, dissipating minimal energy per oscillation period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional oscillation-reducing measures (additional weights, frictional damping, active damping systems) are used, then oscillation amplitudes are reduced, but the device complexity and additional mass increase significantly
Solution Approach 1:
The patent employs simple passive bodies (spheres, cubes, or irregular shapes) made of common materials like metal, plastic, or rubber. These bodies are intentionally simple and inexpensive to manufacture, replacing complex active damping systems. The bodies work through basic impact mechanics rather than sophisticated control systems, achieving oscillation reduction with minimal complexity and cost.
Solution Approach 2:
The invention extracts only the essential oscillation-reducing function from complex damping systems. Instead of using entire active damping systems with sensors, controllers, and actuators, the patent isolates the core mechanism: a simple mass that impacts the housing to dissipate vibrational energy. This extraction achieves oscillation reduction with dramatically reduced complexity.
2Reliability
If additional masses are attached to reduce oscillations, then oscillation amplitudes decrease, but the additional weight becomes impractical due to geometric limitations
Solution Approach 1:
The patent transforms the oscillation-reducing device from a static additional mass into a dynamic system. The body inside the housing moves freely and impacts the housing walls during structure oscillation. This dynamic impact mechanism is far more effective at reducing oscillations than simply adding static mass, achieving the same oscillation reduction with minimal additional weight.
Solution Approach 2:
The invention uses mechanical vibration and impact principles to reduce oscillations. The body inside the housing vibrates and impacts the housing walls in response to structure oscillation, dissipating energy through repeated impacts. This mechanical vibration approach is much more efficient than static mass addition, achieving oscillation reduction with negligible additional weight.
3Ease of operation
If the clearance for movement of the body is increased, then the body can move more freely to make impact contacts, but the energy dissipation per oscillation period increases
Solution Approach 1:
The patent optimizes the clearance parameter to achieve the desired balance between impact effectiveness and energy dissipation. By carefully selecting the clearance size relative to the oscillation amplitude, the body makes sufficient impact contacts to reduce oscillations while limiting excessive energy loss. This parameter optimization ensures the structure loses minimal energy while still achieving effective oscillation reduction.
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 oscillation amplitudes by up to 50% with a minimal total mass, overcoming geometric limitations and achieving substantial vibration reduction with small additional masses.
Implementation Method 1
the body is configured to make impact contacts with the housing at least temporarily for as long as the structure is excited in the at least one mode in the at least on direction
Implementation Method 2
dissipating minimal energy per oscillation period
Data Source
AI summary
An arrangement reduces oscillation (vibration) of an oscillatory structure. The arrangement has a structure having at least one mode in at least one direction; and an oscillation-reducing device (vibration-reducing device). The oscillation-reducing devices has a housing formed by or provided on the structure, a cavity, and a body configured for making impact contacts with the housing and disposed in the cavity in such a manner that the body is configured to make impact contacts with the housing at least temporarily for as long as the structure is excited in the at least one mode in the at least on direction.