Cantilever Hammer Test Simulator

Inputs

Beam length L (in)

Beam length L (m)

Tip: editing either length box updates the other (1 in = 0.0254 m).

Accelerometer position

x_a/L

x_a (in)

x_a (m)

Hammer position

x_h/L

x_h (in)

x_h (m)

Hammer pulse width (ms)

Hammer peak (N)

Sample rate (Hz)

Record length (s)

Modes to simulate

Modal damping ζ (all modes)

Magnitude display (FFT + FRF)

Switch to Linear to view magnitudes without log(dB) scaling.

Cross-section / material

Use 8020 1010 T-slot profile

When enabled: A = 0.511 in², I = 0.0442 in⁴ (converted to m²/m⁴). Otherwise solid bar: A = b·h, I = b·h³/12.

Width b (in)

Height h (in)

Young's modulus E (GPa)

Density ρ (kg/m³)

Fixed

Hammer

Accelerometer

Non-collocated points can create anti-resonance dips in the FRF.

Mode 1 (Hz)

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Mode 2 (Hz)

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EI (N·m²)

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μ = ρA (kg/m)

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Notes: This is an educational simulator. With "8020 1010 T-slot" enabled, A and I use the profile values above; otherwise solid bar is used. Real tests also include sensor/hammer dynamics, windowing, coherence, and fixture compliance.

Time domain

Force input & acceleration output

Frequency domain (FFT)

|F(f)| and |A(f)| (one-sided)

FRF Bode magnitude

|A/F| (accelerance)

FRF Bode phase

∠(A/F)

Tip: Set x_a and x_h far apart to see deeper anti-resonances (modal cancellation). Collocated (same point) will look more like a drive-point FRF (peaks without deep dips).