Wind Turbine Tower Direct Fastener Friction Bonding
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Solution Overview
Problem
Existing methods for fixing components to wind turbine towers are labor-intensive, time-consuming, and can weaken the structural integrity of the tower due to welding or through-going holes, which can lead to micro cracks and stability issues.
Innovation Solution
A direct fastener system using a combination of friction hold and bonding, where the first part is driven into the tower with a powder-actuated tool, avoiding through-going holes and minimizing surface preparation, and the second part protrudes to connect components, potentially using a cylindrical end and external threads for secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If welded connections are used to fix components to the tower, then the connection strength is improved, but the installation time and labor intensity increase
Solution Approach 1:
The fastening system is divided into two separate parts: a fastener element that is driven into the tower wall and a connection element that attaches to the component. This segmentation allows for rapid installation without time-consuming welding operations, while maintaining strong mechanical connection through the interlocking design of the two parts.
Solution Approach 2:
The welding process (thermal/chemical-mechanical system) is replaced with a mechanical fastening system that uses a powder-actuated tool to drive the fastener element into the tower wall. This substitution eliminates the need for complex welding procedures, exact measurements, and skilled welders, significantly reducing installation time and labor intensity.
2Strength
If welded connections are used to fix components to the tower, then the connection strength is improved, but the structural strength of the tower decreases
Solution Approach 1:
The connection function is extracted from the tower structure itself by using a separate fastener element that can be independently installed. This allows the tower wall to remain intact without welding-induced weakening, while the extracted fastening function provides the necessary connection strength through friction and bonding mechanisms.
Solution Approach 2:
The fastener element acts as an intermediary between the tower wall and the component to be fixed. It transfers and distributes the connection forces through friction and bonding along its length, rather than concentrating stresses at weld points, thereby preserving the tower's structural integrity while achieving strong component attachment.
3Strength
If threaded holes are drilled to fix bolts, then the connection strength is improved, but micro cracks and structural stability decrease
Solution Approach 1:
Instead of creating static threaded holes that are prone to cracking, the fastener element creates a dynamic friction-based connection through its driven installation. The powder-actuated tool drives the fastener at high speed, creating friction and bonding forces that lock the fastener in place without the need for threading operations that generate micro cracks.
Solution Approach 2:
The installation process changes the physical parameters of the fastener-tower interface through friction and bonding mechanisms rather than creating mechanical threads. This parameter change from threaded mechanical interlocking to friction-bonding interlocking eliminates the crack-prone threading process while maintaining strong connection forces.
4Strength
If surface preparation is performed at connection points, then the bonding strength is improved, but the installation time increases
Solution Approach 1:
The fastener element itself performs the surface preparation function during installation. As the powder-actuated tool drives the fastener into the tower wall, the fastener's own geometry and installation process create the necessary surface conditions for friction and bonding, eliminating the need for separate surface preparation steps and maintaining high installation speed.
Solution Approach 2:
The surface preparation function is merged with the fastening function. The same action that installs the fastener (driving it into the wall with a powder-actuated tool) simultaneously creates the friction and bonding conditions needed for strong attachment, eliminating the need for separate preparation operations and maximizing productivity.
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 reduces the risk of structural weakening, minimizes micro cracks, and allows for flexible connection points, enhancing the stability and loading capacity of the tower while reducing installation time and costs.
Implementation Method 1
connected thereto by a combination of friction hold and bonding
Implementation Method 2
connected thereto by a combination of friction hold and bonding
Implementation Method 3
A part of this material is punched down into the pre-drilled hole, generating high temperatures and causing friction welding
Data Source
AI summary
An arrangement for fixing a component inside of a wind turbine is disclosed. The arrangement has a portion of a tower and a direct fastener. The direct fastener has a first part and a second part and the portion of the tower is a portion of a wind turbine tower. The first part of the direct fastener is driven into the portion of the tower and is connected thereto by a combination of friction hold and bonding. The second part of the direct fastener protrudes from the portion of the tower and connects to a component.