Libreng Kasanayan sa Inhinyero
Accelerometer Mounting Resonance Calculator
Kalkulahin ang usable frequency range ng iyong accelerometer batay sa mounting method. Ihambing ang stud, adhesive, magnet, at probe tip mounting effects sa measurement bandwidth.
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Mounting Resonance Effect
Ang bawat accelerometer ay may resonant frequency na tinukoy para sa ideal (stud) mounting. Kapag gumagamit ng less rigid mounting methods, ang system resonance ay bumababa dahil ang mounting ay nagdadagdag ng compliance (spring effect).
Where k ay ang mounting reduction factor, typically:
Mounting Methods — Typical Resonance Values
| Paraan ng Pag-mount | Typical Mounted Resonance | Factor k | Usable Range (at ±3 dB) |
|---|---|---|---|
| Stud mount | 28–32 kHz | 0.90–0.95 | ~10 kHz |
| Thin adhesive layer | 18–22 kHz | 0.60–0.70 | ~6–7 kHz |
| Adhesive pad (thick) | 12–16 kHz | 0.40–0.50 | ~4–5 kHz |
| Flat magnet | 6–8 kHz | 0.20–0.25 | ~2–2.5 kHz |
| Two-pole magnet | 3–5 kHz | 0.10–0.15 | ~1–1.5 kHz |
| Probe tip / hand-held | 1.5–2.5 kHz | 0.05–0.08 | ~0.5–0.8 kHz |
ℹ️ Rule of Thumb: Use only up to 1/3 ng mounted resonance frequency para sa measurements sa loob ng ±3 dB accuracy. Para sa ±1 dB, gamitin lamang 1/5. Para sa highest accuracy (±0.5 dB), gamitin lamang 1/10.
Praktical Recommendations
- Route-based monitoring: Ang magnet mount ay common — acceptable para sa frequencies hanggang ~2 kHz (120,000 CPM)
- Permanent monitoring: Palaging gumamit ng stud mount para sa maximum bandwidth at repeatability
- Quick checks: Ang probe tip ay okay para sa low-frequency measurements (1× at 2× sa slow machines)
- Bearing analysis: Nangangailangan ng stud o thin adhesive para sa high-frequency envelope detection
⚠️ Mahalaga: Ang sensor mass ay dapat <10% ng structure mass sa measurement point. Ang heavy sensors sa lightweight structures ay nagbabawas pa ng mounted resonance at maaaring baguhin ang vibration na sinusukat.
Professional accelerometers at vibration analyzers na may stud, magnet at adhesive mounting options.
