Offshore Turbine Frequency Calculator

Structural Dynamics: Calculate combined tower-monopile first natural frequency ($f_0$) and verify Campbell diagram "soft-stiff" margins between $1P$ and $3P$.

Turbine & Tower Structure

Hub Height above Mudline $H$ (m):

RNA Mass (Nacelle + Rotor) (t):

Tower + Monopile Mass (t):

Mean Outer Diameter $D_{mean}$ (m):

Mean Wall Thickness $t_w$ (mm):

Soil Foundation Flexibility:

Rotor Speed Cut-In (rpm):

Rotor Speed Rated (rpm):

Modal Frequency & Resonance Checks

1st Natural Freq ($f_0$)

-- Hz

Natural Period ($T_0$)

-- s

Design Regime

Campbell Status

Excitation Frequency Bands

• 1P Rotor Band (Mass/Aerodynamic Unbalance): -- Hz

• 3P Blade Passing Band (Tower Shadow Impulse): -- Hz

• Soft-Stiff Design Window (10% Margin): -- Hz

• Structural Bending Stiffness ($K_{equiv}$): -- MN/m

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Offshore Turbine Frequency Calculator

Turbine & Tower Structure

Modal Frequency & Resonance Checks

Excitation Frequency Bands

Frequently Asked Questions