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.......2 .... 5 ...... 6 .. 8 LpLILw ..... ......12

-2-. ????:. 1.????????,???:?????????????2.??????????????(OSHA)????:????????????????. -3-. ????:. ??????:????????????????????????..?????????:1.???????????2.????????????3.?????????. -4-. ?????:. ????????????:?????:?????????< 1sec??????:??????????????????:???????,???????????:??????????<0.0

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.......2 .... 5 ...... 6 .. 8 LpLILw ..... ......12

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    1. ???????????? ???:??? ??

    2. -1- ?? ????……………………………………………….......2 ???????……………………………………....…5 ????……………………………………………......…6 ??????????????………………..…8 Lp?LI?Lw …………………………….....…………......12 ?????????………………………...…..16 ????????………………………………...20

    3. -2- ????: 1.????????,???:????????????? 2.??????????????(OSHA)????:????????????????

    4. -3- ????: ??????: ????????????????????????..?? ???????: 1.??????????? 2.???????????? 3.?????????

    5. -4- ?????: ????????????: ?????:?????????< 1sec? ?????:????????????? ?????:???????,?????? ?????:??????????<0.035sec,?????????20dB<0.5sec,????>1sec? ?????:???????????????

    6. -5- ??????? ?= cT = c/f c????T???

    7. -6- ???? ???????20~20000HZ,?????,????????????,?????????????? ????:ί=f2-f1=f0(2(n/2)-2-(n/2))=ίf0 f2?f1????????? f0?????,??????????? fo=

    8. -7- ???? ????????????????21/3????1/3?????,???????????????????????,???????????? ??????????f2=2nf1 ?n=1??????,?f2=2f1 n=1/2?1/2?????,?f2=1.414f1 n=1/3?1/3?????,?f2=1.26f1 ?????n~??????f1?f2?f0??????

    9. -8- ?????????????? ????(Sound Power;W ): ?????????????,??????????,?????(Watts)? ????(Sound Intensity;I): ?????????????,?????????????????????,???(W/m2)? ????(Sound Pressure;P): ?????????????????,???(Pa)?

    10. -9- ??????? N???????,?????????????(Itotal),??????????,?: Itotal=I1+I2+I3+…+In ?I1=P12/?c, I2=P22/?c, In=Pn2/?c,?: P2total=P12+P22+…..+Pn2

    11. -10- ????????????? ????(Effective sound pressure;Prms): ???????(Root Mean Square)???????;Prms= I=P2rms/?c

    12. -11- ???????????? ?????????????????W??????????,????????r??????I???????: I=W/A = W/4pr2 Prms=(?cI)1/2

    13. -12- Lp?LI?Lw

    14. -13- ???????? ?n???,???????? Lp(total)=Lp1+10log n ?????,?????? Lp=10log(100.1Lp1+100.1Lp2+100.1Lp3+….)

    15. -14- LI?LP??? ? ? I=P2/?c ??: LI=LP-Cf,????????,????;LI?LP

    16. -15- Lp?LI?Lw???

    17. -16- ?????? ???(????????????6dB) ???? ?L=20log — ???(????????????3dB) ???? ?L=10log — ?????????

    18. -17- ????????? ?????? ?????? SPL,SIL,SWL Lp=Lw-20logr-K K =11 (????) =8 (?????) =5 (Ό????)

    19. -18- ????????? ?????? ?L=10log[100.1L1+100.1L2+···+100.1Ln] ?????? ??????10????,?????? ?????? ???(fn+1=2fn) ???????(fn+1=21/3fn) ?????(fc<1000HZ)

    20. -19- ????????? ?????? ???? ???? ?L=10log—,(3~10dB) A:???(A=aa) a:????(0.01~1.2) ???? T.L :????,20~40dB

    21. -20- ???????? ?????????

    22. -21- ???????? ?????

    23. -22- ???????? ?????

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