NPR Materials in Racquets and Golf Tees for Energy Transfer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing racquets and golf tees do not efficiently transfer energy to the ball, leading to suboptimal launch distance and aerodynamic performance.
Innovation Solution
Utilizing materials with a negative Poisson's ratio (NPR) in the construction of racquets and golf tees, particularly in frames, handles, and strings, to enhance energy transfer and aerodynamics, combined with positive Poisson's ratio (PPR) materials for composite structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional positive Poisson's ratio materials are used in racquet frames, then the frame structure is simple and easy to manufacture, but energy transfer to the ball is inefficient resulting in suboptimal launch distance
Solution Approach 1:
The patent changes the fundamental material parameter from positive Poisson's ratio to negative Poisson's ratio. This parameter change transforms the material's deformation behavior under stress, allowing the frame to expand laterally when compressed axially, which creates more efficient energy transfer pathways to the ball during impact, directly resolving the energy transfer inefficiency without complicating manufacturing processes
Solution Approach 2:
The patent employs composite material construction combining NPR materials with traditional PPR materials in the frame structure. This composite approach allows the NPR components to provide enhanced energy transfer properties while PPR components maintain structural integrity and manufacturing simplicity, achieving both improved energy transfer efficiency and ease of manufacture simultaneously
2Productivity
If NPR materials are used to enhance energy transfer, then launch distance improves, but material selection and construction complexity increases
Solution Approach 1:
The patent applies NPR materials locally in specific frame regions where energy transfer is most critical, such as the impact zone and throat areas, rather than throughout the entire frame. This localized application maximizes launch distance improvement while minimizing the complexity of material selection and construction, as only portions of the frame require specialized NPR materials
Solution Approach 2:
The patent uses composite construction combining NPR and PPR materials in the frame, allowing the NPR components to be strategically positioned for optimal energy transfer while PPR components provide structural support. This composite approach balances performance enhancement with construction feasibility, reducing overall material selection complexity compared to using NPR materials exclusively
3Use of energy by moving object
If NPR foam material with specific cellular structure is used, then energy absorption and transfer improve, but manufacturing precision requirements increase
Solution Approach 1:
The patent utilizes NPR foam materials with controlled porous cellular structures that inherently provide energy absorption capabilities. The porous architecture allows the material to deform and absorb impact energy efficiently while the foam structure itself tolerates certain manufacturing variations in cell size and distribution, reducing the stringency of manufacturing precision requirements compared to solid non-porous materials
Solution Approach 2:
The patent specifies a range for the characteristic dimension of the cellular structure (0.1 μm to 3 mm) rather than requiring a single precise value. This parameter range approach maintains effective energy absorption across varying cell sizes, accommodating manufacturing tolerances and reducing the need for extreme manufacturing precision while still achieving optimal energy transfer performance
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
Enhances energy transfer and launch distance while reducing wind resistance, resulting in improved performance characteristics such as longer launch distances and better control.
Implementation Method 1
the frame including a negative Poisson's ratio (NPR) foam material, in which the frame has a Poisson's ratio of between 0 and −1
Implementation Method 2
The NPR foam material is composed of a cellular structure having a characteristic dimension of between 0.1 μm and 3 mm
Data Source
AI summary
A racquet includes a handle; and a frame connected to an end of the handle, the frame defining a rounded interior space, the frame including a negative Poisson's ratio (NPR) foam material, in which the NPR foam material, and in which the frame has a Poisson's ratio of between 0 and −1; and a network of strings stretched across the rounded interior space defined by the frame. A golf tee includes an elongated stem; and a head disposed at an end of the elongated stem and shaped to receive a golf ball; in which at least a portion of the golf tee is formed of a negative Poisson's ratio (NPR) foam material, in which the portion of the golf tee has a Poisson's ratio of between 0 and −1, and in which the NPR foam material includes an NPR metal foam, an NPR ceramic foam, or an NPR-PPR composite foam.