Voitko suomentaa niin että lauseesta saa selvää ?Märkäruuti kirjoitti: ↑28 Elo 2025, 14:16Jos yrität korjata tuon konstruktion aiheuttamaa jaksollista värähtelyä pyörivän osan tasapainotusta parantamalla, etä ymmärrä mistä on kyse.
Väitätkö että jos loku laite tärisee sitä ei saa hoidettua korjaamalla sitä ?
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GEMINI AUTTAA VATIPÄÄTÄ:
Gravity significantly affects wind turbine blades, especially large ones. It's a cyclic force that causes bending and stress in the blades as they rotate.
How Gravity Acts on the Blades
As a wind turbine blade rotates, it is constantly subjected to the force of gravity, which acts straight down. This creates a cyclic loading on the blade. The effect of this force changes depending on the blade's position in its rotation:
Blade at the Top (12 o'clock position): At the top of the rotation, gravity pulls the blade down, creating a bending force at the blade's root (where it connects to the hub). This is the most significant gravitational load on the blade.
Blade at the Side (3 or 9 o'clock position): As the blade moves to a horizontal position, gravity pulls it sideways, creating a bending force perpendicular to the direction of rotation (known as "edgewise" bending). This force is typically less than the downward pull.
Blade at the Bottom (6 o'clock position): At the bottom of the rotation, the blade is being lifted against the force of gravity, which can slightly counteract the aerodynamic forces that are pushing the blade.
This constant change in gravitational force with each revolution causes the blade to flex and bend. This is a primary source of fatigue loading on the blades and the rest of the turbine's structure, including the hub, gearbox, and tower. The turbine must be designed to withstand these repetitive stresses over its 20-25 year lifespan.
Gravity and Turbine Design
Engineers account for gravity's effects in several ways:
Blade Material and Design: Wind turbine blades are typically made from lightweight but strong composite materials like fiberglass and carbon fiber. This reduces the overall mass of the blade, which lessens the effect of gravity. The blades are also designed with a specific stiffness and flexibility to absorb and manage the cyclic bending loads.
Blade Balancing: The blades are carefully balanced during manufacturing to ensure the mass of each blade is evenly distributed. Any imbalance can worsen the effects of gravity, leading to excessive vibrations and accelerated wear on components.
Pitch Control Systems: Modern turbines use pitch control systems to adjust the angle of the blades in real-time. This helps to manage the forces acting on the blades, including aerodynamic lift and drag, and can also be used to mitigate some of the effects of gravitational loading.
The gravitational forces are relatively small compared to the immense aerodynamic forces from the wind that propel the blades. However, their repetitive, cyclic nature makes them a critical factor in the long-term structural integrity and fatigue life of the entire wind turbine system.
