Multi-beam Wind Turbine Blade Structure for Weight Reduction

The blade is divided into multiple crossbeams (first crossbeam, second crossbeam, third crossbeam, fourth crossbeam) distributed along the blade span. This segmentation allows the carbon fiber structure to be distributed across multiple elements rather than concentrated in a single thick beam, maintaining stability while using lighter material. Each crossbeam carries a portion of the load, collectively providing the structural support needed.

The patent uses carbon fiber composite materials for the crossbeams, combining high-strength carbon fiber with resin matrix. This composite material provides sufficient strength-to-weight ratio to support the blade structure without requiring excessive thickness. The composite nature allows optimization of fiber orientation and layering to achieve both weight reduction and structural stability.

Multiple crossbeams are distributed along the blade length to segment the long blade into smaller structural units. This segmentation reduces the effective span between support points, increasing natural frequency and reducing bending moments. The distributed crossbeam structure prevents the entire blade from flexing as a single unit, thereby reducing fatigue loads.

The patent introduces crossbeams as a transverse structural element perpendicular to the blade span direction. This adds a dimensional framework that provides out-of-plane support, increasing torsional and bending stiffness without significantly increasing blade mass. The crossbeams create a three-dimensional load-bearing framework that enhances frequency and fatigue resistance.

Carbon fiber composite crossbeams provide high specific stiffness (stiffness-to-weight ratio). The carbon fiber reinforcement in the resin matrix creates a composite structure that achieves superior rigidity compared to traditional glass fiber or solid structures, while maintaining lower weight. The anisotropic properties of carbon fiber composites allow optimization of stiffness in critical directions.

Instead of adding continuous structure layers along the entire blade, the patent uses discrete crossbeam segments positioned at critical locations. This segmented approach provides rigidity enhancement only where structurally necessary, avoiding unnecessary weight addition in less critical regions. The crossbeams act as localized stiffness enhancers rather than continuous reinforcement.