[Data] ์ „๋™ ๋ชจํ„ฐ ์ด์ƒํƒ์ง€ ๋ฐ ๋ถ„๋ฅ˜๋ฅผ ์œ„ํ•œ ์ฃผํŒŒ์ˆ˜ ๋ถ„์„

2023. 9. 26. 09:25ยท๐Ÿฌ ML & Data/โ” Q & etc.
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1. ๋ฐ์ดํ„ฐ ์ทจ๋“

  • Sampling rate 25.6kHz 
  • DC Motor, ์ž์ฒด ์ œ์ž‘ ์‹คํ—˜ํ™˜๊ฒฝ
  • ๋ฐ์ดํ„ฐ ํŒŒ์ผ ๋‹น 102,400๊ฐœ ํฌ์ธํŠธ

2. FFT ๋ชจํ„ฐ ์ฃผํŒŒ์ˆ˜ ๋ถ„์„

1. Normal

  • ์ •์ƒ์ƒํƒœ ๋ชจํ„ฐ์˜ ์ฃผํŒŒ์ˆ˜๋Š” ์ง„๋™ ์ฐจ์ˆ˜(Harmonic)๊ฐ€ ๋ฐ˜๋น„๋ก€ํ•œ๋‹ค. ํ˜„์žฌ ์‹คํ—˜ ์„ธํŠธ์˜ ๋ชจํ„ฐ๋Š” ์•ฝ 3600rpm์„ ๊ฐ€์ง€๊ณ  ์žˆ์œผ๋ฏ€๋กœ ์ง„๋™์ฐจ์ˆ˜๋Š” 1์ฐจ 60Hz, 2์ฐจ 120Hz, 3์ฐจ 180Hz๋กœ ์ด๋ฃจ์–ด์ ธ ์žˆ๋‹ค.
  • ์œ„ FFT ์ฃผํŒŒ์ˆ˜ ๋ถ„์„ ๊ฒฐ๊ณผ 1์ฐจ, 2์ฐจ, 3์ฐจ ์ง„๋™ ์ฐจ์ˆ˜ ์ˆœ์œผ๋กœ amplitude๊ฐ€ ๊ฐ์†Œํ•˜๋Š” ๊ฒƒ์„ ํ™•์ธํ•  ์ˆ˜ ์žˆ๋‹ค.

2.  Misalignment

  • ์˜ค์ •๋ ฌ(Misalignment) ์ƒํƒœ๋Š” Parallel Misalignment(์ง€๋ฉด๊ณผ ๋ชจํ„ฐ์˜ ์ถ•์€ ํ‰ํ–‰ํ•˜๋‚˜ ๋ฒ ์–ด๋ง์„ ๊ธฐ์ค€์œผ๋กœ ๋‹จ์ฐจ๊ฐ€ ์กด์žฌํ•  ๋–„)์™€ Angular Misalignment(์ง€๋ฉด๊ณผ ๋ชจํ„ฐ์˜ ์ถ•์ด ๋ฒ ์–ด๋ง์„ ๊ธฐ์ค€์œผ๋กœ ํ‰ํ–‰ํ•˜์ง€ ์•Š์„ ๋•Œ) ๋‘ ๊ฐ€์ง€๋กœ ๋‚˜๋ˆŒ ์ˆ˜ ์žˆ๋‹ค.
  • ์ด ๊ทธ๋ž˜ํ”„์˜ Misalignment๋Š” Angular Misalignment ์ƒํƒœ์ด๋‹ค. Misalignment ์ƒํƒœ์—์„œ๋Š” ์ •์ƒ ์ƒํƒœ์™€๋Š” ๋‹ฌ๋ฆฌ 2์ฐจ ์ง„๋™ ์ฐจ์ˆ˜๊ฐ€ 1์ฐจ ์ง„๋™ ์ฐจ์ˆ˜๋ณด๋‹ค Amplitude๊ฐ€ ๋†’์€ ๊ฒƒ์„ ๋ณผ ์ˆ˜ ์žˆ๋‹ค.

3. Unbalance

  • ๋ถˆ๊ท ํ˜•(Unbalance) ์ƒํƒœ๋Š” ๋ชจํ„ฐ ์ถ•์˜ ๋ฌด๊ฒŒ / ์งˆ๋Ÿ‰ ์ค‘์‹ฌ์ด ํšŒ์ „ ์ค‘์‹ฌ๊ณผ ์ผ์น˜ํ•˜์ง€ ์•Š๋Š” ๊ฒฝ์šฐ ์›์‹ฌ๋ ฅ์ด ๋ฐœ์ƒํ•˜๋Š” ๊ฒƒ์œผ๋กœ, Single plane imbalance(๋‹จ์ผ ํ‰๋ฉด ๋ถˆ๊ท ํ˜•, ๋ชจํ„ฐ ์–‘์ธก ์ƒคํ”„ํŠธ์˜ ๋ถˆ๊ท ํ˜• ๋ฐฉํ–ฅ์ด ํ•œ ๋ฐฉํ–ฅ์ผ ๋•Œ)์™€ Two plane imbalance(์–‘ ํ‰๋ฉด ๋ถˆ๊ท ํ˜•, ๋ชจํ„ฐ ์–‘์ธก ์ƒคํ”„ํŠธ์˜ ๋ถˆ๊ท ํ˜• ๋ฐฉํ–ฅ์ด ์ •๋ฐ˜๋Œ€์ผ ๋•Œ)๋กœ ๋‚˜๋‰œ๋‹ค.
  • ์ด ๊ทธ๋ž˜ํ”„์˜  Unbalance๋Š” Single plane imbalance ์ƒํƒœ์ด๋‹ค. Unbalance ์ƒํƒœ์—์„œ๋Š” 1์ฐจ ์ง„๋™ ์ฐจ์ˆ˜์˜ Amplitude๊ฐ€ ๋ชน์‹œ ๋†’๊ฒŒ ๋‚˜ํƒ€๋‚œ๋‹ค.

4. Damaged Bearing

์ •์ƒ์ƒํƒœ ๋ฒ ์–ด๋ง

 

๊ฒฐํ•จ ๋ฒ ์–ด๋ง

  • ๋ฒ ์–ด๋ง ๊ณ ์žฅ(Damaged Bearing) ์ƒํƒœ๋Š” ์™ธ๋ฅœ ๋ฒ ์–ด๋ง ๊ฒฐํ•จ, ๋‚ด๋ฅœ ๋ฒ ์–ด๋ง ๊ฒฐํ•จ, ์ผ€์ด์ง€ ๊ณ ์žฅ, ๋ฒ ์–ด๋ง ๋ณผ ๊ณ ์žฅ์˜ 4๊ฐ€์ง€ ๊ณ ์žฅ์ƒํƒœ๋กœ ๋‚˜๋‰œ๋‹ค. ๊ฐ๊ฐ์˜ ๊ณ ์žฅ์ƒํƒœ๋Š” ๋ฒ ์–ด๋ง ๋ณผ์˜ ๊ฐœ์ˆ˜, ์ ‘์ด‰๊ฐ, ๋‚ด๋ฅœ๊ณผ ์™ธ๋ฅœ ์ง€๋ฆ„, RPM์„ ๊ธฐ๋ฐ˜์œผ๋กœ ์„œ๋กœ ๋‹ค๋ฅธ ๊ณ ์ฃผํŒŒ์ˆ˜ ์˜์—ญ์—์„œ ํŠน์ง•์ ์œผ๋กœ ๋“œ๋Ÿฌ๋‚œ๋‹ค.
  • ์ด ๊ทธ๋ž˜ํ”„์˜ Damaged Bearing์€ ์ผ€์ด์ง€ ๊ฒฐํ•จ์ƒํƒœ๋ฅผ ์žฌํ˜„ํ•˜์˜€๊ณ , ๋ฒ ์–ด๋ง ๊ณ ์žฅ ์ข…๋ฅ˜์— ๋”ฐ๋ฅธ ๋ถ„๋ฅ˜์— ๊ฐ€์ค‘์„ ๋‘์ง€ ์•Š์•˜์œผ๋ฏ€๋กœ ์œ„ ๋„ค ๊ฐ€์ง€ ๊ณ ์žฅ ์ƒํƒœ๋ฅผ ํ†ตํ‹€์–ด ๋ฒ ์–ด๋ง ๊ฒฐํ•จ ์ƒํƒœ๋กœ ๋ณด์•˜๋‹ค. ๊ณ ์ฃผํŒŒ ์˜์—ญ์—์„œ ๋งŽ์€ Amplitude๊ฐ€ ๋ฐœ์ƒํ•˜๋Š” ๊ฒƒ์„ ํ™•์ธํ•  ์ˆ˜ ์žˆ๋‹ค.
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