Bepul muhandislik vositasi #037
Qanat o'tish chastotasi kalkulyatori
Calculate blade pass frequency (BPF) for fans, pumps, and impellers. Includes harmonics 1× through 5× and shaft frequency.
Results
BPF Harmonics
| Harmonic | Frequency (Hz) | Tartib (× val) | Period (ms) |
|---|
Qanot o'tish chastotasi (BPF)
Qanot o'tish chastotasi (BPF) — qanot yoki panjaralar belgilangan mos nuqtadan o'tish tezligidir. U ventilyatorlar, nasoslar, kompressorlar, turbinalar va qanotli har qanday aylanma mexanizmlarga tegishli.
- Z — qanot yoki panjaralar soni
- RPM — valning aylanish tezligi
- fs — val chastotasi = RPM/60 (Hz)
Val chastotasi
Garmoniklar nima uchun muhim
BPF harmonics (2×BPF, 3×BPF, etc.) provide diagnostic information:
- 1×BPF ustunlik qilganda: Oddiy ish rejimi — qanot o'tishidan kelib chiqadigan bosim pulsatsiyalari
- 1×BPF oshganda: Oraliq muammolari, oqim buzilishi yoki rezonans
- BPF garmoniklari ko'payganda: Sinusoidal bo'lmagan bosim impulslari — qanot shikastlanishi, notekis joylashuv yoki kavitatsiya
- BPF va mil tezligining yon chastotalari: Alohida parchaning shikastlanishi yoki yig'ilishi
Amaliy Misol
Given: Z = 6, RPM = 2950
fs = 2950/60 = 49.17 Hz
BPF = 6 × 49.17 = 295 Hz
2×BPF = 590 Hz, 3×BPF = 885 Hz
Period = 1/295 = 3.39 ms
Tip: Markazdan qochma nasoslarda krylchatok qanotlari va voluta kesuvchisi o'rtasidagi o'zaro ta'sir BPF tebranishining asosiy manbai hisoblanadi. Krylchatkaning tashqi diametri va kesuvchi o'rtasidagi bo'shliqni (odatda krylchatka diametrining 5–10%) optimallashtirish BPF amplitudasini sezilarli darajada kamaytirishi mumkin.
Ventilyator va nasoslarni diagnostika qilish, sahnada balanslash va texnik holat monitoringi uchun professional tebranish tahlili asboblari. 50+ mamlakatda qo'llaniladi.
