Podshipnik nuqsoni chastotalari nima?

Podshipnik nuqsoni chastotalari — sirg'aluvchan podshipnikning tarkibiy qismlaridan birida (tashqi halqa, ichki halqa, dumalash elementlari yoki separator) mahalliy nuqson mavjud bo'lganda hosil bo'ladigan xarakterli tebranish chastotalaridir. Har bir tarkibiy qism podshipnik geometriyasi va val aylanish tezligiga qarab o'ziga xos chastota ishlab chiqaradi.

Tashqi halqa nuqsonini qanday aniqlash mumkin?

An outer race fault appears at the BPFO frequency and its harmonics (2×, 3× BPFO) in the vibration spectrum. Since the outer race is typically stationary, the impacts produce a clean, evenly spaced pattern. BPFO is the most common bearing defect frequency.

Ichki halqa va tashqi halqa nuqsonlari o'rtasidagi farq nima?

Tashqi halqa nuqsonlari BPFO chastotasida namoyon bo'ladi va odatda spektrda aniqroq ko'rinadi, chunki nuqson doimiy joylashgan yuklama zonasida bo'ladi. Ichki halqa nuqsonlari BPFI chastotasida val aylanish chastotasidagi yon polosalanish bilan namoyon bo'ladi, chunki nuqson yuklama zonasiga kirib-chiqib aylanadi.

Podshipnik tahlilida garmoniklar nima uchun muhim?

Harmonics (2×, 3× etc.) of bearing defect frequencies indicate defect severity. Early-stage defects show mainly the fundamental frequency. As damage progresses, more harmonics appear with increasing amplitude. The presence of multiple harmonics suggests an advancing fault.

Podshipnik geometriyasi ma'lumotlarini qaerdan topish mumkin?

Podshipnik geometriyasi ma'lumotlari (dumalash elementlari soni, shar diametri, qafas diametri, aloqa burchagi) SKF, FAG/Schaeffler, NSK, Timken, NTN va boshqa ishlab chiqaruvchilarning kataloglarida mavjud. Ko'plab ishlab chiqaruvchilar onlayn vositalar va ma'lumotlar bazalarini ham taqdim etadi. Ba'zi tebranish tahlili dasturlarida o'rnatilgan podshipnik ma'lumotlar bazalari mavjud.

Bepul Muhandislik Vositasi #035

Podshipnik nosozligi chastotasi kalkulyatori

Calculate BPFO, BPFI, BSF, and FTF from bearing geometry and shaft speed. Includes 2× and 3× harmonics for vibration diagnostics.

BPFO BPFI BSF FTF

Results

BPFO — Tashqi Halqa Nuqsoni Chastotasi

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BPFI — Ichki Halqa Nuqsoni Chastotasi

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BSF — Sharning aylanish chastotasi

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FTF — Qafas (sепаратор) chastotasi

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Val chastotasi

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Garmonikalar jadvali

Frequency	1× (Hz)	1× (Order)	2× (Hz)	2× (Order)	3× (Hz)	3× (Order)

Podshipnik Nuqsoni Chastotalari

Dumalanuvchi element podshipnikida mahalliy nuqson paydo bo'lganda, takrorlanuvchi zarba podshipnik geometriyasi va val aylanish tezligiga bog'liq xarakterli chastotalarni hosil qiladi. To'rtta asosiy nuqson chastotasi quyidagilardir:

Asosiy qafas chastotasi (FTF)

Qafasning aylanish chastotasi. FTF qiymatining oshishi qafas eskirganligi yoki shikastlanganligini bildiradi.

Tashqi halqadan o'tish chastotasi (BPFO)

Dumalanuvchi elementlarning tashqi halqaning bir nuqtasidan o'tish tezligi. Bu eng ko'p uchraydigan nuqson chastotasi, chunki tashqi halqa nosozliklari statistik jihatdan eng tez-tez kuzatiladi.

Ichki halqadan o'tish chastotasi (BPFI)

Dumalanuvchi elementlarning ichki halqaning bir nuqtasidan o'tish tezligi. Ichki halqa nosozliklari odatda BPFI atrofida val chastotasi bilan yon chastotalar (sideband) ko'rinishida namoyon bo'ladi.

Sharning o'z o'qi atrofidagi aylanish chastotasi (BSF)

Dumalanuvchi elementning o'z o'qi atrofidagi aylanish chastotasi. Dumalanuvchi element nuqsonlari ko'pincha 2× BSF da namoyon bo'ladi, chunki har bir to'liq aylanishda nuqson ikkala halqa bilan ham teginadi.

Note: Ushbu formulalar sirpanish yo'q deb taxmin qiladi — amalda chastotalar sirpanish va elastogidrodinamik ta'sirlar sababli 1–3% ga farq qilishi mumkin. Amaliyotda vibrasiya spektrini tahlil qilishda bu qiymatlarni taxminiy ko'rsatkichlar sifatida ishlating.

Amaliy Misol

Misol — 6205 podshipnik, 1500 RPM

Given: Z = 9, B_d = 7.94 mm, P_d = 38.5 mm, α = 0°, RPM = 1500

Shaft freq = 1500/60 = 25 Hz

B_d/P_d = 0.2062, cos(0°) = 1

FTF = 25/2 × (1 − 0.2062) = 9.92 Hz

BPFO = 9/2 × 25 × (1 − 0.2062) = 89.31 Hz

BPFI = 9/2 × 25 × (1 + 0.2062) = 135.69 Hz

BSF = (38.5/(2×7.94)) × 25 × (1 − 0.2062²) = 58.55 Hz

⚠️ Note: Contact angle α is 0° for deep groove ball bearings. For angular contact bearings it is typically 15–40°, and for tapered roller bearings 10–30°. Using the wrong contact angle will give incorrect frequencies.

Podshipnik nuqson chastotalari kalkulyatori | BPFO BPFI BSF FTF

Published by admin on Fevral 15, 2026 Fevral 15, 2026