SFRA curves nyeem li cas, thiab qhov twg ntawm qhov winding sib haum rau txhua qhov ntau zaus?
Ib qho SFRA zaj duab xis qhia qhov sib piv (dB) piv rau zaus ntawm lub ntsuas ntsuas. Cov kab mob tau muab faib ua peb thaj chaw loj:
|
Ntau zaus |
Sensitive Rau |
Tej yam ntxwv |
|
Tsawg (10 Hz - 2 kHz) |
Cov yam ntxwv tseem ceeb |
Dominated los ntawm core inductance; Cov kev hloov pauv qhia txog qhov seem hlau nplaum, cov tub ntxhais hauv av faults |
|
Nruab nrab (2 kHz - 200 kHz) |
Winding geometry (axial / radial) |
Resonant peaks los ntawm kev sib cuam tshuam LC; Kev hloov pauv qhia tias disc buckling, clamping siab poob |
|
Siab (200 kHz - 2 MHz) |
Lead configuration & local structure |
Sawv nthwv dej ntawm cov hlau lead; Cov kev hloov pauv qhia tias hloov pauv kais - hloov pauv lossis bushing cov hlau lead txav |
Cov cai tseem ceeb ntawm kev txhais lus:
1. Ib zaus hloov ntawm resonant peaks (sab laug / sab xis) → hloov hauv inductance lossis capacitance (deformation).
2. A magnitude change (>3 dB) → hloov hauv damping tsis kam (xoo sib txuas).
3. Tshiab los yog ploj lawm resonant peaks → kev hloov kho los yog kev puas tsuaj sab hauv.
4. Ib txwm muab piv rau theem- rau- cov kab mob theem - ib qho chaw noj qab haus huv qhia tau hais tias nyob ze - cov kab zoo tib yam thoob plaws peb theem.
Quantitative cov qauv (ib IEEE C57.149):
1. Correlation coefficient (CC) > 0.98 → windings nyob rau hauv zoo.
2. 0.90 < CC < 0.98 → marginal, tej zaum yuav xav tau kev tshawb nrhiav ntxiv.
3. CC <0.90 → tseem ceeb deformation, tej zaum yuav tsum tau soj ntsuam ntxiv.