Belt Flap Calculator - Conveyor Maven

Belt Properties

Belt Speed (m/s):

Belt Weight (kg/m):

Belt Side:

Idler Properties

Idler Spacing (m):

Idler Diameter (mm):

Belt Tension Range

Minimum Tension (kN):

Maximum Tension (kN):

Idler Frequency

0.0 Hz

Flap Mode @ Min Tension

0.0 Hz

Tension: 0 kN

Flap Mode @ Max Tension

0.0 Hz

Tension: 0 kN

Analysis

About Belt Flap

CEMA Chapter 6, Page 249:

Belt flap occurs when the natural frequency of the belt span between idlers approaches the idler passage frequency, causing resonance and excessive vibration.

Formulas:

Idler Frequency = Speed / (π × Diameter)
Flap Mode = √(Tension / Weight) / (2 × Spacing)

Guidelines:

Higher tension reduces flap risk
Closer idler spacing reduces flap
Higher speeds increase flap risk
Avoid resonance (flap mode ≈ idler frequency)