What is vibration phase angle?

Phase angle describes the timing relationship between a vibration signal and a reference. It is measured in degrees (0–360°) and indicates where in the rotation cycle the peak vibration occurs. Phase is critical for balancing and diagnosing machine faults.

How do I measure phase angle?

Phase is measured using a tachometer (keyphasor) as a reference, combined with a vibration sensor. The phase angle is the angular difference between the tachometer pulse and the peak of the 1× vibration signal.

What is the vector sum of two vibration signals?

The vector sum combines two vibration signals (each with amplitude and phase) into a single resultant vector. It uses the formula: add the x-components and y-components separately, then calculate the resultant amplitude and phase.

Why is relative phase important in balancing?

In single-plane balancing, the phase shift between the original vibration and the trial-weight run indicates the angular correction needed. A 180° phase shift means the correction weight should be placed opposite to the trial weight.

What does 0° vs 180° phase mean?

0° phase between two measurement points means the points move in the same direction simultaneously (in-phase, common with unbalance). 180° means they move in opposite directions (out-of-phase, typical of misalignment or a rotor operating above its critical speed).

Ferramenta de Engenharia Gratuita — #018

Calculadora de Ângulo de Fase de Vibração

Calcule a fase relativa, a soma vetorial e a diferença vetorial de dois sinais de vibração. Insira a amplitude e a fase de cada sinal.

Soma VetorialDiferença VetorialFase Relativa

Resultados

Ângulo de Fase Relativa

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Soma Vetorial (Amplitude)

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Soma Vetorial (Fase)

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Diferença Vetorial (Amplitude)

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Diferença Vetorial (Fase)

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Representação Vetorial

Cada sinal de vibração é um vetor V = A∠φ, com componentes cartesianas:

Soma & Diferença Vetorial

Fase Relativa

O ângulo de fase relativa entre dois sinais:

Exemplo Prático

Exemplo — Comparação de Rodadas de Balanceamento

Sinal 1: 5.2 ∠45° → x₁ = 3.677, y₁ = 3.677

Sinal 2: 3.8 ∠200° → x₂ = −3.571, y₂ = −1.300

Diferença vetorial: Δx = 7.248, Δy = 4.977 → |ΔV| = 8.79 ∠34.4°

Fase relativa: |200° − 45°| = 155°

ℹ️ Dica: No balanceamento em plano único, a diferença vetorial entre a rodada original e a rodada com massa de teste representa o efeito da massa de teste isoladamente.