Bicycle Frame Vibration Isolators with Quasi-Zero Stiffness
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Solution Overview
Problem
Standard bicycles fail to effectively isolate riders from vibrations transmitted through the frame, leading to rider discomfort and reduced ride quality.
Innovation Solution
Incorporating vibration isolators with a non-linear stiffness profile, including a region of quasi-zero stiffness, which are operatively connected to the frame, front steering axle, front fork assembly, and handlebar assembly to isolate the rider from vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If standard bicycle frame structure is used, then device complexity is low, but rider comfort deteriorates due to vibrations transmitted through the frame
Solution Approach 1:
Vibration isolators are introduced as intermediary components between the frame and the rider's body contact points (handlebar assembly, front fork assembly, steering axle). These isolators absorb and dissipate vibrations, preventing them from being transmitted to the rider while maintaining the overall simplicity of the bicycle frame structure.
Solution Approach 2:
The vibration isolators utilize materials or mechanisms with non-linear stiffness profiles that change their mechanical properties based on the applied load and vibration characteristics. This allows the isolators to adapt their damping characteristics to different vibration frequencies and amplitudes, effectively reducing transmitted vibrations without requiring complex active control systems.
2Object-affected harmful factors
If vibration isolators with non-linear stiffness profile are added, then rider comfort improves, but device complexity increases
Solution Approach 1:
The vibration isolation system is segmented into multiple independent isolators positioned at different locations where vibrations are most severely felt (frame, handlebar assembly, front fork assembly, steering axle). Each isolator handles specific vibration paths, allowing the system to achieve comprehensive vibration isolation through modular addition of simple components rather than a single complex system.
Solution Approach 2:
Vibration isolators are strategically placed at specific locations on the bicycle where vibrations are most impactful to the rider (handlebar area, front fork area, steering axle). This localized approach targets the most critical vibration transmission paths without requiring vibration isolation throughout the entire bicycle structure, thereby limiting the increase in 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
The vibration isolators significantly improve ride comfort and quality by isolating both upper and lower body portions of the rider from frame vibrations, reducing fatigue and enhancing overall riding experience.
Implementation Method 1
The one or more vibration isolators can be configured to exhibit a non-linear stiffness profile including a region of quasi-zero stiffness. The one or more vibration isolators can isolate a rider of the bicycle from vibrations transferred through the frame.
Data Source
AI summary
A bicycle can include a frame. The frame can include a front steering axle, a front fork assembly, and a handlebar assembly for steering a front wheel of the bicycle. The bicycle can also include one or more vibration isolators. The one or more vibration isolators can be operatively connected to at least one of the frame, the front steering axle, the front fork assembly, and the handlebar assembly. The one or more vibration isolators can also be configured to exhibit a non-linear stiffness profile including a region of quasi-zero stiffness. As a result, the one or more vibration isolators isolate a rider of the bicycle from vibrations transferred through the frame.