Modular Wind Turbine Rotor Blade Assembly Using Resistive Welding
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Solution Overview
Problem
The transportation and assembly of long rotor blades for wind turbines are costly and logistically challenging due to the need for specialized equipment and time-consuming on-site assembly of detachable mechanical joints, which can lead to rusting and high weight, while adhesive bonds require complex and expensive processes.
Innovation Solution
A method involving segmented rotor blade modules with sloped interface sections made of weldable thermoplastic or thermoset resin, joined using a resistive element to apply heat and form a joint through molten or softened resin, allowing for rapid assembly without additional materials and creating a homogeneous laminate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If detachable mechanical joints (T-bolts, stud connections, fasteners) are used to join rotor blade modules, then assembly speed and ease of operation are improved, but the joint weight increases, reliability deteriorates due to rusting and lightening attraction, and maintenance requirements increase
Solution Approach 1:
The patent replaces mechanical joining systems (T-bolts, stud connections, fasteners) with a welding-based joining system. The welding process uses a resistive element to generate heat and melt thermoplastic or thermoset resin at the interface sections, creating a permanent bond that eliminates the need for mechanical fasteners, thereby improving reliability by eliminating rusting and lightening attraction issues while maintaining ease of operation through automated welding processes
Solution Approach 2:
The patent changes the physical state of the resin material during joining - using heat to transition the resin from solid to molten state during welding, then back to solid upon cooling. This parameter change enables the creation of strong bonds without mechanical fasteners, resolving the contradiction between assembly ease and joint reliability
2Strength
If adhesive bonds are used to join rotor blade modules, then structural efficiency and economic efficiency are improved, but assembly time increases significantly and specialized equipment is required for on-site assembly
Solution Approach 1:
The patent replaces adhesive bonding with a welding process that uses resistive heating to melt and fuse the resin at the interface sections. This substitution eliminates the need for lengthy adhesive application, positioning, and curing processes, reducing assembly time by several orders of magnitude while maintaining structural efficiency through direct material fusion
Solution Approach 2:
The patent utilizes phase transition of the resin material - heating it to molten state for bonding, then allowing it to solidify upon cooling. This phase transition enables rapid joining without the extended curing times required by adhesive bonds, resolving the contradiction between structural efficiency and assembly time
3Strength
If long rotor blades are manufactured as single pieces, then structural integrity is improved, but transportation and handling costs increase significantly due to logistics challenges
Solution Approach 1:
The patent divides the rotor blade into multiple transportable modules with sloped interface sections that can be joined through welding. This segmentation allows each module to be transported separately using standard logistics infrastructure, significantly reducing transportation and handling costs while maintaining overall structural integrity through the welded connections at the interface sections
4Length of moving object
If segmented rotor blade modules are assembled using traditional methods, then transportability is improved, but assembly complexity and cost increase due to need for specialized equipment and additional materials
Solution Approach 1:
The patent replaces complex adhesive bonding equipment and mechanical fastening systems with a simpler welding process using resistive heating. This substitution reduces assembly complexity by eliminating the need for specialized adhesive application equipment, surface preparation tools, and mechanical fastening systems, while enabling efficient joining of segmented modules
Solution Approach 2:
The welding process is self-service in that the resistive element generates its own heat through electrical resistance, eliminating the need for external heating equipment. The process automatically melts the resin at the interface sections, which then bond the modules together upon cooling, reducing assembly complexity and eliminating the need for additional bonding materials
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 method reduces assembly time by several orders of magnitude, improves mechanical performance, and enables modular design with recyclable materials, enhancing transportability and eliminating the need for full-size molds.
Implementation Method 1
energizing the resistive element to apply heat to the weldable thermoplastic resin and/or the weldable thermoset resin to melt or to soften it
Implementation Method 2
apply heat to the weldable thermoplastic resin and/or the weldable thermoset resin to melt or to soften it
Data Source
AI summary
A method for assembling a rotor blade of a wind turbine: a) providing at least two different rotor blade modules that segment the rotor blade along a longitudinal direction thereof, wherein each rotor blade module has a sloped interface section that include a weldable thermoplastic resin and/or a weldable thermoset resin (M, b) providing a resistive element, c) arranging the rotor blade modules and the resistive element in such a way that sloped interface sections face each other and the resistive element is sandwiched between the sloped interface sections, d) energizing the resistive element to apply heat to a weldable thermoplastic resin and/or the weldable thermoset resin to melt or to soften it, and e) joining the sloped interface sections together at a joint by means of the molten or softened weldable thermoplastic resin and/or the weldable thermoset resin to form the rotor blade.