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Áøµ¿´ÜÀ§ º¯È¯ (dB, °¡¼Óµµ, ¼Óµµ, º¯À§)


°øÇØÁøµ¿ÀÇ Áøµ¿¼ö ¹üÀ§´Â 1~90 HzÀ̸ç Áøµ¿·¹º§·Î´Â 60dB~80dB±îÁö°¡ ¸¹°í »ç¶÷ÀÌ ´À³¢´Â ÃÖ¼Ò Áøµ¿°¡¼Óµµ·¹º§Àº 55± 5dB Á¤µµÀÌ´Ù.

¡Ø dB : Áøµ¿ÀÇ Å©±â¸¦ dB Ç¥½Ã

Áøµ¿°¡¼Óµµ·¹º§(Vibration Acceleration Level : VAL)

 

 VAL=20log( a/a¡£) dB

a    ÃøÁ¤´ë»ó Áøµ¿ÀÇ °¡¼Óµµ ½ÇÈ¿Ä¡ ( m / s2 )
a¡£ Áøµ¿°¡¼Óµµ ·¹º§ÀÇ ±âÁØÄ¡ ( 10
-5
m / s2 )

 

¡Ü ´ÜÀ§ º¯È¯ : dB ¢¡ °¡¼Óµµ

¢Ñ VAL = 20log( a/a¡£) dB
     ¡Å a = 10(dB/20)x10-5

ex) 80dB = 20log( a/10-5 )
      a(°¡¼Óµµ) = 10(dB/20)x10-5
      a = 10(80/20)x10-5
      a = 0.1  m / s2

 

¡Ø  °¡¼Óµµ, ¼Óµµ, º¯À§

 

 

¡Ø °¡¼Óµµ (a)
           a = -A¡£¥ø
2 sin ¥øt

¡Ø ¼Óµµ (v)
           v = A¡£¥ø cos ¥øt

¡Ø º¯À§(¥ì)
           ¥ì = A¡£sin ¥øt

           ¢Ñ °¢Áøµ¿¼ö (¥ø)
 
           ¥ø = 2 ¥ð f
            f  = Hz (ÁÖÆļö)

 

 

¡Ü ´ÜÀ§ º¯È¯ : °¡¼Óµµ ¢¡ ¼Óµµ ; °¡¼Óµµ ¢¡ º¯À§

 

 °¡¼Óµµ (a) =  A ¥ø2    ( m/s2, §¯/s2, §®/s2 )
 
¼Óµµ (v) = A ¥ø    ( m/s, §¯/s, §®/s )
 
º¯À§(¥ì) =  A    ( m, §¯, §® )

 ¥ø = 2 ¥ð f ;  f  = Hz (ÁÖÆļö) 
 

¢Ñ ¼Óµµ (v) = A ¥ø
¢Ñ ¼Óµµ (v) = a / ¥ø

ex) ÁÖÆļö 100 Hz¿¡¼­ °¡¼Óµµ°¡ a
= 0.1  m / s2   ÀÏ ¶§
     
 ¼Óµµ (v) = a / ¥ø
     
 ¼Óµµ (v) = 0.1 / (2 ¥ð x 100)
     
 ¼Óµµ (v) = 0.000159 m/s
     
 

¢Ñ º¯À§(¥ì) =  A
¢Ñ º¯À§(¥ì) =  a / ¥ø2

ex) ÁÖÆļö 100 Hz¿¡¼­ °¡¼Óµµ°¡ a
= 0.1  m / s2   ÀÏ ¶§
     
 
º¯À§(¥ì) =  a / ¥ø2
     
 º¯À§(¥ì) =  0.1 / (2 ¥ð x 100)2
     
 
º¯À§(¥ì) =  0.000000253 m ( 0.253 §­ )


¡Ø  Áøµ¿ÀÇ ÃøÁ¤Ä¡´Â ½ÇÈ¿Ä¡(¶Ç´Â ÃÖ´ëÄ¡)¸¦ °èÃøÇÏ´Â °ÍÀÓÀ¸·Î ¾î´À°ÍÀ̳ª sin, cosÀÇ ½Ã°£Àû º¯È­Ä¡¸¦ ¹èÁ¦ÇÏ°í, Áï º¯À§ÀÇ ½ÇÈ¿Ä¡(¶Ç´Â ÃÖ´ëÄ¡) ¸»ÇÑ´Ù.

 

ex)

 

Hz

dB 1)

°¡¼Óµµ 2)
§­/s
2

¼Óµµ 3)
 §­/s

º¯À§ 4)
 §­

1.0

11.1

35.9

5.7

0.91

2.0

9.3

29.2

2.3

0.18

4.0

14.7

54.3

2.2

0.09

8.0

21.4

117.5

2.3

0.05

16.0

18.7

86.1

0.9

0.01

31.5

28.1

254.1

1.3

0.01

63.0

22.1

127.4

0.3

0.00

125.0

15.0

56.2

0.1

0.00

250.0

5.2

18.2

0.0

0.00

500.0

5.7

19.3

0.0

0.00

AP 5)

30.5

333.1

17.6

0.93

 

1)dBÀÇ ÇÕ
  10 Log (10
(11.1/10)+10(9.3/10)+......+10(5.7/10)) = 30.5 dB

2)dB ¢¡ °¡¼Óµµ
  10
(11.1/20)x10-5 = 0.0000359 m/s2
    .
    .
    .
  10
(30.5/20)x10-5 = 0.000335 m/s2   

3)°¡¼Óµµ ¢¡ ¼Óµµ
  35.9 / (2 ¥ð x 1.0) = 5.7 §­/s
    .
    .
    .
  19.3 / (2 ¥ð x 500) = 0.0 §­/s

4)¼Óµµ ¢¡ º¯À§
  35.9 / (2 ¥ð x 1.0)
2 = 0.91§­
    .
    .
    .
  19.3 / (2 ¥ð x 500)
2 = 0.00§­

5)AP
  dBÀÇ ÇÕ ref 10-5 ; 10-7 ; 10-9

 

 

¡Ø  Áøµ¿ ´ÜÀ§ ȯ»êÇ¥(º¯À§,¼Óµµ,°¡¼Óµµ)

 

 

 

 

¡Ø Áøµ¿·®ÀÇ ´ÜÀ§

 

±¸ºÐ

±âº»´ÜÀ§

º¯È¯ ´ÜÀ§

°¡¼Óµµ

cm/s2

gal = 1 cm/s2

g = 980cm/s2 ¡Ö1000 gal

m/s2 = 102 cm/s2

inch/s2

¼Ó  µµ

cm/s

mm/s = 10-1 cm/s

kine = 1 cm/s

m/s = 102 cm/s

inch/s

º¯  À§

cm

¥ì = 10-3mm = 10-4cm

mm = 10-1 cm

m = 102 cm

inch

 

 

¡Ø Áøµ¿·¹º§ ( Vibration Level : VL )

 

 - Áøµ¿°¡¼Óµµ ·¹º§¿¡ ÀÎüÀÇ °¨°¢º¸Á¤°ªÀ¸·Î º¸Á¤ÇÑ Áøµ¿·¹º§

 VL = VAL + Wn dB(V) or dB(H)

 - ÀÎü°¨°¢ º¸Á¤Ç¥ ( Wn ) 1/3 OCT.

  ÁÖ ÆÄ ¼ö  (Hz)

1.0

1.25

1.6

2.0

2.5

3.15

4.0

5.0

6.3

8.0

  ¼öÁ÷º¸Á¤dB(V)

-6

-5

-4

-3

-2

-1

0

0

0

0

  ¼öÆòº¸Á¤dB(H)

0

0

0

0

-2

-4

-6

-8

-10

-12


  ÁÖ ÆÄ ¼ö  (Hz)

10.0

12.5

16.0

20.0

25.0

31.5

40.0

50.0

63.0

80.0

  ¼öÁ÷º¸Á¤dB(V)

-2

-4

-6

-8

-10

-12

-14

-16

-18

-20

  ¼öÆòº¸Á¤dB(H)

-14

-16

-18

-20

-22

-24

-26

-28

-30

-32

 

- ÀÎü°¨°¢ º¸Á¤Ç¥ ( Wn ) 1/1 OCT.

  ÁÖ ÆÄ ¼ö  (Hz)

1.0

2

4

6.3

8

16

31.5

63.0

  ¼öÁ÷º¸Á¤dB(V)

-6

-5

-4

-3

-2

-1

0

0

  ¼öÆòº¸Á¤dB(H)

0

0

0

0

-2

-4

-6

-8


 
À̸§¾ÆÀÌÄÜ µ¿»ê
2008-01-04 12:45
Àڷẹ»ç ¹æ¹ýÀÌ ¾ø³ª¿ä?
   
À̸§¾ÆÀÌÄÜ Á¶¿îÀç
2008-06-02 01:55
ÀڷḦ ¹Þ¾Æº¼¼ö ÀÖ³ª¿ä? ...
   
 
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