Wind Turbine Tower Ring Reinforcement for Door Opening
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional wind turbine tower designs face challenges in maintaining ring strength and rigidity when a hollow is cut for an access door, leading to costly and complex reinforcement solutions that often increase weight.
Innovation Solution
Incorporation of a pair of beams on both sides of the lower ring opening, which can be welded inside or outside the tower, providing necessary rigidity to reduce ring thickness by 10-20% without requiring a pre-installed door frame, and enhanced with fatigue-resistant methods like Burr Grinding or Tig Dressing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a hollow is cut into the lower ring of the tower to install an access door, then the door can be installed to enable worker access, but the ring strength and rigidity are reduced
Solution Approach 1:
The structural reinforcement is divided into two separate beams (first beam and second beam) positioned on opposite sides of the hollow. Each beam independently reinforces the ring structure, allowing the door to be installed while maintaining ring strength through distributed reinforcement rather than a single concentrated structure.
Solution Approach 2:
The beams are positioned specifically at the regions adjacent to the hollow where stress concentration occurs. This localized reinforcement targets the critical areas needing strength restoration without requiring thickening of the entire ring, thereby maintaining overall structural efficiency while restoring local strength.
2Strength
If the ring thickness is increased to compensate for the hollow, then the ring strength is maintained, but the manufacturing complexity and cost increase
Solution Approach 1:
Instead of increasing the thickness of the entire ring section, the reinforcement is segmented into two separate beams that are attached to the existing ring. This approach maintains the original ring manufacturing simplicity while adding targeted reinforcement only where needed, avoiding the complexity of manufacturing a uniformly thicker ring section.
Solution Approach 2:
The beams are designed to be integrated with the existing ring structure through attachment mechanisms, combining the original ring with the reinforcement elements. This merging approach allows the use of the existing ring design without modification while adding the necessary structural support through the attached beams.
3Strength
If a door frame is pre-installed to reinforce the hollow area, then the ring strength is maintained, but the manufacturing cost and complexity increase
Solution Approach 1:
The reinforcement is divided into two separate beams rather than requiring a complete door frame structure. This segmentation reduces the amount of material and manufacturing steps needed compared to a full frame, lowering costs while still providing the necessary structural support at the critical stress points.
Solution Approach 2:
The solution extracts only the essential reinforcement elements (two beams) needed to maintain ring strength, removing the unnecessary portions of a complete door frame structure. This extraction approach maintains structural integrity while eliminating redundant manufacturing complexity and cost.
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 solution maintains structural integrity while reducing the ring thickness, minimizing stress and enhancing fatigue resistance, thus offering a cost-effective and efficient method to integrate a door into the wind turbine tower without increasing the tower's weight.
Implementation Method 1
The structural element is mounted by welding on both sides of the lower ring opening
Implementation Method 2
This welded coupling is further strengthened by applying currently known State of the Art methods for enhancing resistance to fatigue such as Burr Grinding or Tig Dressing
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
Reinforced hollow for a wind turbine tower comprising a lower ring (2) that determines an opening (3) for the installation of an access door (not represented) inside the tower (1). The hollow incorporates at least one structural element (4) that is fastened on both sides of the opening (3) of the tower's lower ring (2), providing the rigidness necessary to attach a door and permit the reduction of the thickness of the ring by 10-20%.