Question 1

What is vibration acceleration?

Accepted Answer

Vibration acceleration is the rate of change of vibration velocity, measured in m/s² or g (where 1 g = 9.80665 m/s²). It is the most sensitive parameter to high-frequency vibration and is critical for detecting bearing defects, gear mesh faults, and other high-frequency mechanical problems. Acceleration increases with both vibration amplitude and frequency.

Question 2

When should I use acceleration instead of velocity for vibration monitoring?

Accepted Answer

Acceleration is preferred for high-frequency vibration analysis, typically above 1000 Hz. It is the best parameter for early detection of rolling element bearing defects, gear mesh problems, and cavitation. Velocity (mm/s RMS) is better for general machine condition in the 10–1000 Hz range, while displacement is preferred below 10 Hz. Many modern condition monitoring systems use acceleration enveloping (demodulation) for bearing diagnostics.

Question 3

How do I convert g to m/s²?

Accepted Answer

To convert from g to m/s², multiply by 9.80665 (standard gravity). For example, 0.5 g = 0.5 × 9.80665 = 4.903 m/s². Conversely, to convert m/s² to g, divide by 9.80665. The g unit is commonly used in vibration analysis because typical industrial vibration levels fall in a convenient range of 0.01 to 50 g.

Question 4

What sensors measure vibration acceleration?

Accepted Answer

Piezoelectric accelerometers are the standard sensors for measuring vibration acceleration. IEPE (ICP) type accelerometers with integrated electronics are most common in industrial applications. They offer wide frequency range (0.5 Hz to 20 kHz+), high sensitivity, and excellent durability. MEMS accelerometers are used in lower-cost monitoring systems but typically have more limited frequency range and accuracy. Charge-mode accelerometers are used for high-temperature applications.

Question 5

What is typical vibration acceleration for industrial machines?

Accepted Answer

Typical vibration acceleration levels vary widely with machine type and frequency. For general industrial machinery at operating speed: good condition is below 0.5 g, acceptable is 0.5–2 g, and alarm levels are typically 2–5 g at bearing housings. High-frequency bearing defect signals can reach 10–50 g peak. ISO 20816 primarily uses velocity for zone evaluation, but acceleration is measured directly by accelerometers and is essential for high-frequency diagnostics.

參數	最佳頻率範圍	典型單位	主要用途
位移	< 10 Hz (600 RPM)	μm p-p	低速機組、軸振動
速度	10–1000 Hz	mm/s RMS	一般機組狀態 (ISO 10816)
加速度	> 1000 Hz	m/s², g	軸承缺陷、齒輪嚙合、高頻

振動加速度計算器 (ISO 20816)

結果

由速度計算加速度

轉換為 g

由速度計算位移

實務範例

振動參數比較

振動加速度計算器 — mm/s 轉 m/s² & g

結果

由速度計算加速度

轉換為 g

由速度計算位移

實務範例

振動參數比較

商店

支撐

聯絡我們