Titanium Offset String Bumper Vibration Damping
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Solution Overview
Problem
Existing archery bowstring bumpers do not effectively minimize vibration energy transfer from the bowstring to the riser, leading to a need for a more efficient solution.
Innovation Solution
A titanium offset string bumper with a bumper rod and rubber bumper design, where the bumper rod is fabricated from GR2 titanium and features a round cross-section, offset portion, and a thread for secure attachment, minimizing vibration energy transfer by less than 5%.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a traditional string bumper is used, then the structure is simple and easy to manufacture, but it transmits excessive vibration energy (more than 5%) from the bowstring to the riser
Solution Approach 1:
The bumper rod is constructed from composite materials including a titanium alloy (such as Ti-6Al-4V) and a polymer material (such as nylon or Delrin). This composite construction allows the bumper to achieve superior vibration damping properties while maintaining structural integrity and reducing overall complexity compared to single-material solutions.
Solution Approach 2:
The bumper rod features varying cross-sectional dimensions along its length, with a first cross-sectional dimension at the first end and a second cross-sectional dimension at the second end. This local variation in geometry optimizes vibration energy transmission characteristics at different locations, allowing the bumper to effectively reduce overall vibration transmission while maintaining necessary structural properties where required.
2Object-affected harmful factors
If a titanium offset string bumper is used, then vibration energy transmission is reduced to less than 5%, but the manufacturing complexity increases due to precision requirements for the offset portion and threading
Solution Approach 1:
The bumper rod is segmented into distinct functional portions: a base portion for mounting, an offset portion for geometric vibration reduction, and a bumper portion for string contact. This segmentation allows each portion to be optimized independently for its specific function while simplifying the overall manufacturing process through modular construction.
Solution Approach 2:
The offset portion is designed with specific geometric parameters including an offset distance between 0.0625 inches and 0.125 inches, and an offset angle between 30 degrees and 45 degrees. These controlled parameter variations are optimized to reduce vibration energy transmission while remaining within standard manufacturing tolerances for machining and fabrication processes.
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 titanium offset string bumper significantly reduces vibration energy transfer from the bowstring to the riser, enhancing archery performance by minimizing shock and noise.
Implementation Method 1
The titanium offset string bumper has the unexpected result of passing less than 5% of the vibration energy from a bowstring striking thereof and passing the vibration to a riser of an archery bow
Implementation Method 2
The rubber bumper preferably includes an inwardly curved front to receive a bowstring and a rod bore sized to receive the bumper portion
Data Source
AI summary
A titanium string bumper preferably includes a bumper rod and a rubber bumper. The bumper rod includes a base portion, an offset portion and a bumper portion. The bumper rod preferably includes a round cross section. A thread may be formed on one end of the base portion and one end of the offset portion extends from an opposing end of the base portion. The offset portion forms an angle of between 60-165 degrees with the base portion. One end of the bumper portion extends from an opposing end of the offset portion. The rubber bumper includes an inwardly curved front to receive a bowstring and a rod bore, which is sized to receive the bumper portion. The bumper portion is pushed into the rod bore. The base portion is retained in a riser of an archery bow.