Golf Ball Dimple Depth and Coating Roughness Correlation
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Solution Overview
Problem
Current methods for enhancing aerodynamic performance of golf balls focus separately on dimple design and surface roughness, without examining their correlation, which can lead to unwanted dynamic lift and reduced carry distance in driver shots.
Innovation Solution
A golf ball configuration where the average maximum depth of dimples and arithmetic average roughness of the coating layer satisfy a specific relational expression, optimizing the correlation between dimple depth and surface roughness to enhance flying performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If extra dynamic lift is caused by the influence of the dimples, then the golf ball experiences more lift, but the golf ball develops a hopping trajectory resulting in shorter carry
Solution Approach 1:
The invention changes the parameters of surface roughness (Ra) and dimple depth (Fa) to specific ranges that optimize aerodynamic performance. By controlling Ra to be 0.003 mm or more and establishing the relationship -1.5×Fa+0.8≦Ra≦-1.5×Fa+1.8, the patent achieves reduced drag and dynamic lift while preventing hopping trajectory, thereby extending carry distance.
2Ease of manufacture
If the process of producing roughness and the design of dimples are examined separately, then each factor can be optimized independently, but the correlation between these two factors is not utilized resulting in suboptimal aerodynamic performance
Solution Approach 1:
The invention merges the previously separate considerations of surface roughness and dimple design into a unified approach. By establishing the correlational expression -1.5×Fa+0.8≦Ra≦-1.5×Fa+1.8 that links Ra and Fa, the patent combines these two factors into an integrated aerodynamic optimization system that achieves superior carry distance compared to independent optimization.
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 configuration improves the carry distance of driver shots by reducing drag and dynamic lift through a multiplier effect of dimple depth and surface roughness, resulting in enhanced flying performance.
Implementation Method 1
The dimples causes turbulence of air flows around the golf ball when flying, thereby creating a turbulent separated flow
Implementation Method 2
This phenomenon is referred to as 'creation of turbulence', and this creation of turbulence shifts backward an air separation point from the golf ball, resulting in reducing drag
Implementation Method 3
The creation of turbulence increasingly enlarges a deviation between an upper air separation point and a lower air separation point of the golf ball due to a backspin, thereby augmenting a dynamic lift acting on the golf ball
Implementation Method 4
a method for providing roughness to the surface by polishing the surface of the golf ball in order to have an influence on aerodynamic performance of the golf ball
Data Source
AI summary
A golf ball of one aspect of the present invention includes a spherical core, one or more cover members to cover the core, and a coating layer to coat a cover member configuring an outermost layer of the one or more cover members. A plurality of dimples is formed in the cover member of the outermost layer. Roughness is produced on a surface of the coating layer after applying a coat over the cover member of the outermost layer. An average value Fa (mm) of maximum depths of the plurality of dimples and arithmetic average roughness Ra (μm) on the surface of the coating layer, satisfy a relational expression:−1.5×Fa+0.8≦Ra≦−1.5×Fa+1.8.