Fiber Composite Vibration Damping via Carbon Nanotube Strip Layers
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Solution Overview
Problem
Fiber composite materials used in lightweight structural applications, such as transport robot arms, face challenges with increased brittleness and insufficient vibration damping, leading to prolonged vibration decay times that reduce productivity.
Innovation Solution
A fiber composite material is developed by incorporating multi-layered carbon nanotubes and a second resin in strip-shaped composite resin layers, which are angled between 0 to less than 90 degrees relative to the fiber prepreg layers, forming a hollow tubular body to enhance vibration damping while maintaining material hardness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the mechanical arm is made of polymer fiber composite material with high physical strength, then the material strength is improved, but the brittleness increases and the material breaks more easily
Solution Approach 1:
The patent employs a composite structure combining fiber prepreg layers with strip-shaped composite resin layers containing multi-layered carbon nanotubes. This composite material approach allows the material to maintain high strength while the carbon nanotube layers provide enhanced toughness and energy absorption, reducing brittleness and preventing catastrophic failure.
Solution Approach 2:
The patent modifies the material composition by incorporating carbon nanotubes at specific concentrations (0.5 to 8 wt %) and arranging layers at specific angles (0 to less than 90 degrees). These parameter changes transform the material properties, enabling it to maintain strength while reducing brittleness through controlled energy dissipation mechanisms.
2Reliability
If the vibration decay time is prolonged to allow the mechanical arm to stop from deformation swing, then the vibration amplitude is reduced to acceptable level, but the productivity is reduced
Solution Approach 1:
The patent utilizes mechanical vibration principles by incorporating damping layers that convert vibrational energy into heat through internal friction. The carbon nanotube-containing resin layers provide viscoelastic damping that rapidly dissipates vibration energy, reducing decay time from seconds to milliseconds, thus maintaining vibration control while improving productivity.
Solution Approach 2:
By changing the material composition parameters—specifically adding carbon nanotubes at optimized concentrations and arranging layers at specific angles—the patent alters the damping characteristics of the mechanical arm. This enables faster vibration decay (reducing the time constant) while maintaining acceptable vibration amplitude control.
3Weight of moving object
If fiber composite material is used to achieve lightweight structure, then the weight is reduced, but the vibration damping effect is insufficient
Solution Approach 1:
The patent creates a multi-layer composite structure where lightweight fiber prepreg layers provide structural strength while strip-shaped resin layers containing multi-layered carbon nanotubes provide vibration damping. This composite approach achieves both lightweight construction and effective vibration damping without requiring heavy materials.
Solution Approach 2:
The patent applies damping functionality locally through strip-shaped composite resin layers positioned at specific locations and angles on the fiber prepreg layers. Rather than making the entire structure heavy, the damping properties are concentrated in specific zones where they are most effective, maintaining overall lightweight design while providing sufficient vibration damping.
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 significantly improves vibration damping efficiency, reducing vibration decay time and maintaining material rigidity, thus enhancing productivity and structural performance.
Implementation Method 1
the plurality of the strip-shaped composite resin layers include multi-layered carbon nanotubes and a second resin... significantly improves vibration damping efficiency, reducing vibration decay time
Implementation Method 2
the plurality of the strip-shaped composite resin layers include multi-layered carbon nanotubes and a second resin
Implementation Method 3
winding the fiber prepreg layer and the plurality of the strip-shaped composite resin layers to form a hollow tubular body having a lamination of multi-layer fiber prepreg layers
Implementation Method 4
a fiber composite material including: a fiber prepreg layer including a first resin and fibers impregnated in the first resin; and a plurality of strip-shaped composite resin layers disposed on the fiber prepreg layer
Data Source
AI summary
A fiber composite material and a manufacturing method thereof are provided. The fiber composite material includes: a fiber prepreg layer including a first resin and fibers impregnated with the first resin; and a plurality of strip-shaped composite resin layers including multi-layered carbon nanotubes and a second resin disposed on the fiber prepreg layer, wherein the plurality of the strip-shaped composite resin layers and the fiber prepreg layer together form a hollow tubular body, and a length direction of the plurality of strip-shaped composite resin layer is at an angle of from 0 degree and less than 90 degrees with respect to an extending direction of the fiber prepreg layer.