Identification And Reduction of Noise And Vibration level On Rear Handle Of Handheld Tools Using Fast Fourier Transform (FFT) Technique.

(1)

(2)

.&"#* 0 1111111111111111111111111111111111111111111111111111

"' (+ *) $ %( 0 ( 2! & "! '

(3)

% )( # % * ' ## & 7" # "! *!+ !!' &# (+ ,* ' &#% ( # " !( (+ "& "! &. & &. # * #* / "# "!% - # (&(

" *!# (+ "& "! &. & &. & $ % # 8& 8"! "!" % " !"8"

(4)

.&"#* 0 ==============

"' (+ "& "# 0

(5)

( ' !($ +"# "& '(# > " %# +"' ! ' ' % "& & <# (+ 8 &>

(6)

%%"!"''*"!" 8*' "& "!"' "#* "!" % "

"&8% #( !!" > +( . $ &. ' ) ' %% (& #( (')! # # % ) (: #1 & -(*! ! 8 #( ( ' . " +*! # "&8 #( "!! # %*))( #> & (* ". ' &# "&

&%) "# (&% # "# "$ $ * &. (')! # &. # % ) (: #1

-(*! ! 8 #( <) %% . "# %# # "&8+*! "& ")) "# (& #( ' %*) $ %( > ( 2! & "! ' (+ - - " " .(( -( 8 &. !"# (&% )> "& - ( " (++ ' " -(& +*! !) "& & (* ". ' &#1 "!%( . $ % ' +*!! (+ %*))( # "& " $ 1

"!%( -(*! ! 8 #( <) %% ' . "# #* #( " *! 2"' & "* > # & "& +( " *!# (+ "& "! &. & &. +( . $ &. ' % (() "# (& "&

(7)

$

%". (+ "& ! #((! # "# *% ! # # % $ - 1 ((! ! 8 !! %

$ *% +*! +( (&%# * # (& -( 81 !!% # "# "& )*& (& # " %* +" '"8 # "# #((! )()*!" 1 (- $ > *%". (+ # % #((! $ " - !! . $ " & %% +( # *% 1 +( > # " ' (+ # % ) (: # % #( &# + # " "% # "# ) ( * . $ "# (& ! $ !1 ? # %* #" ! %(+#-" > # " " "& &# + 1 #" . # " " +( # % ) (: # % (& # " "& ! (+ # !!1 % % "*% # "# " " % # '" &

(! +( # "# #((!1 (&# (!! -(*! "))! & ( #( * # $ "# (& (& # "# #((! "& '"8 # #((! (' '( %#" ! 1 &> # %*.. %# (& +(

'( + "# (& +( # #((! % .& -(*! %*.. %# #( '"8 %* # *% % %"+ #

(8)

(9)

$

616 " 8. (*& 6

613 : # $ % 3

61A () % 3

614 7 ( ! ' #"# ' &# 3

61B 7 (: # *#! & A

316 &# ( * # (& 4

313 ( (+ $ "# (& 4

31316 ) % (+ $ "# (&% B

31A ) &. "& "') C

(10)

(11)

(12)

(13)

(14)

(15)

<

C16E %*!# +( ,* %# ". "' 7 (&# (!! FE

C135 %*!# +( ')*!% ". "' 7 (&# (!! D5

C136 %*!# +( # ) %)(&% ". "' 7 (&# (!! D6

C133 %*!# +( ( ". "' 7 (&# (!! D3

C13A %*!# +( ((# ( *% ". "' 7 (&# (!! DA

C134 %*!# +( ,* %# ". "' 7 (&# (!! D4

C13B %*!# +( ')*!% ". "' 7 (&# (!! DB

C13C (')" %(& %*!# +( # ) %)(&% ". "' DC

C13F (')" %(& %*!#% +( ( ". "' DC

C13D (')" %(& %*!# +( ((# ( *% ". "' DC

C13E (')" %(& %*!# +( ,* %# ". "' DF

(16)

(17)

(18)

C16F ( ". "' +( 7 (&# (!! FF

C16D ((# ( *% ". "' +( 7 (&# (!! FD

C16E ,* %# ". "' +( 7 (&# (!! FE

C135 ')*!% ". "' +( 7 (&# (!! D5

C136 # ) %)(&% ". "' +( 7 (&# (!! D6

C133 ( ". "' +( 7 (&# (!! D3

C13A ((# ( *% ". "' +( 7 (&# (!! DA

C134 ,* %# ". "' +( 7 (&# (!! D4

(19)

(20)

%)!" ' &# 1

!( # 11

! "# (&

η

(#( ++ &

(21)

(22)

(23)

(24)