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TRÖÔØNG ÑAÏI HOÏC BAÙCH KHOA TP. HCMKHOA CÔ KHÍBOÄ MOÂN THIEÁT KEÁ MAÙY
BAØI TAÄP LÔÙNCHI TIEÁT MAÙY
Sinh vieân thö! hie"n # N$%&ễn H'( ǹ$ )ũ MSS)#*+,+-+*
ÑEÀ TAØI
Ñeà soá 2# THIEÁT KEÁ HEÄ THOÁNG DAN ÑOÄNGBA!NG TA"I
P#$%&' ()& soá*+,
He- .#oá&' /(0& 1o-&' (3&' .(45 'oà6* /0 Ñ'"n$ !1 2ie"n - 3h( 4h'ân$ 2'5n$ 6'"7 *0 N'8i t9%! 2(:nh'5i7 -0 H'"3 $i(;< t'8! 6(=nh 9(>n$ t9% h(i !(83 4h(i ?t9ie@n70 B'" t9%&e5n !h '8n$ !'n D(>n7 E0 B(>n$ t(;i.
7oá 85e-9 .#5eá. :eá*Fö! v':n$ t9eân 6(>n$ t(;i NJ# E++)("n t'8! 6(>n$ t(;i v
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T9! I
T9! II
T9! III
Che8 2'" t(;i# T/ T 7 T* +.T 7t/ J 7 t* -+J
C.TI ́ NH TOAN THIÊT KÊ TRUC
I. Tinh toan 3 truc c hô p gm tc1. Chn v t !" # truc!$ th%p C&' tô c th" n
( )* h+n ,-n σ b=750 MPa
( )* h+n ch/ σ c=450 MPa
( Chn 0 ,ô 2ng 0#t #n cho ph%p 456 789 :p( ;ng 0#t v* truc >?# v$o v$ >?# r 4@6 7 A9BA' :p( ;ng 0#t v* truc tr#ng gn 4@6719B1' :p
A. ac >Dnh >EFng Ginh 0 ,ô thHo công th2c
. Truc I v* TI 7 13198J1A3 Kmm L 4 τ ¿=20 MPa
d1≥3
√ T I
0,2 [ τ ]=
3√136107,1230,2.20 =32,4 mmT chn thHo t"# ch#Mn N1 73' mm
,. Truc II v* TII7&AOO1JA&& Kmm L 4@67 1':p
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d2≥ 3
√ T II
0,2 [ τ ]=
3√ 426881,2440,2.15 =52,2mmT chn NA 7 '' mm
c. Truc III v* TIII 7PO1O&PJP98 Kmm L 4U67 A9 :Q
d3≥ 3
√ T III
0,2 [ τ ]=
3√ 981849,9070,2.20 =62,6mmT chn N37' mm
3. ac >Dnh GhoRng cach g >S v$ >m >U t !Vc
%:n$ !(=! 4&= hie"% (% 2(â• 4 V '8 thö= tö !%;( t9%! t9'n$ h'"3 $i(;< t'8! 4 /*-7• i V '8 thö= tö !%;( tie8t ie"n t9%! t9eân 2'= !'= D(W3 !(=! !hi tie8t
th(< $i( t9%&e5n t(;i t9'n$#i + v(: /# !(=! tie8t ie"n t9%! D(W3 '@i *X v1=i D(: '8 !hi tie8t Y%(& 6(=nh 2(i 6(=nh 9(>n$
4h1=3 n'8i XJ
• V 4h'(;n$ !(=!h $iöZ( !(=! $'8i 21Z + v(: / t9eân t9%! thö= 47
• V 4h'(;n$ !(=!h tö: $'8i 21Z + 2e8n tie8t ie"n thö= i t9eân t9%!
thö= 47
• V !hie5% (:i
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S1 2'5 tnh 4h'(;n$ !(=!h t9%! thö= * !%;( h'"3 $i(;< t'8! 6(=nh 9(>n$ t9
T9'n$ 2'=# 0 4h'(;n$ !(=!h tö:
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( Ch-# N$ m/Hr ,anh rUng tru cp nhnh!mAA7 `1JAd1J'NA 7`1JAd1J'. ''7dOAJ' mm
t chn !mAA789 mm
( Ch-# N$ m/Hr ,anh rUng tru cp ch m !mA37 `1JAd1J'NA 7 `1JAd1J'. ''7dOAJ' mmt chn !mA37 8' mm
!A1 7!mAAe3G 1e!mA3eAG Ae,9A 7 89e3.19e8'eA.19eAP7AA&mm!AA7 9J'`!mAAe,9AeG 1eG A7 9J'`89eAPe19e197 PJ' mm!A37 9J'`!mAA e !mA3 e G 1 e !AA7 9J'`89e8'e19 e PJ' 7 1'A mm
c. Truc III `>?# r( Ch-# N$ m/Hr ,anh rUng tru cp ch m
!m3A7 `1JAd1J'.N3 7 `1JAd1J'.'78OdP8J' mm
t chn !m3A7P' mm( Ch-# N$ m/Hr c >f
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( Vc No Gh*p n c2ng!Vc vng tr"n Gh*p n c2ng
F t =2.T I
Dt =
2 .136107,123
90=3024,6 N
T9'n$ 2'=# 0 Ñö1:n$ 4nh v':n$ t9':n Y%( t(â< !(=! !h'8t !%;(t9%! n'8i v':n$ 2(:n h'5i.
T9( 6(;n$ /0/+( ( kch Ytinh toan thZt GZ N\n >ô ng c Ghi(t pA_v1=i TI 136107,123 N
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( Tinh mômHn tEng >Eng t+ cac tZt N" n tr"n ch-# N$ truc
tinh mômHn #n tng M $=√ M $y2 + M $#
2
mômHn tEng >Eng M td$=√ M $2+0,75T $
2
qo >
M td=√ M #2 + M y
2 +0,75T 2=√ 52829,52+0+0,75.136107,1232=129169,7 Nmm
M tdD=√ M D#2+ M Dy
2+0,75T D
2=√ 69800,92+1767482+0,75.136107,123 2=223620 Nmm
M td% =√ M %#2 + M %y
2 +0,75T % 2=√ 0+0+0,75.136107,1232=117872,2 Nmm
( Tinh >EFng Ginh truc t+ cac tZt N" n
T c công th2c
d $ ≥3
√ M td$0,1[σ ]
Trong > 456 !$ 2ng 0#t cho ph%p c th%p chZ t+o truc
T+
d ≥3
√ M td
0,1 [ σ ] =
3
√129169,7
0,1.70 =26,4 mm
Chn N7AO mm
T+ q
d D ≥ 3
√ M tdD
0,1[ σ ]=
3√ 2236200,1.70 =31,73mmChn Nq73' mm
F rBA
N
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_T( C
d% ≥3
√ M td%
0,1 [ σ ]=
3√ 117872,20,1.70 =25,6mm
Chn NC7AO mm
T+ s
Chn Ns7N7 AO mm
,. Truc II` tr#ng gn
( Tinh phn !Vc tr"n cac g tV
69800,9
18905
F r
52829,5
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T9'n$
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(
C BA
F t
F r
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( Tinh >EFng Ginh truc t+ cac tZt N" n
T c công th2c
d $ ≥3
√ M td$0,1[σ ]
Trong > 456 !$ 2ng 0#t cho ph%p c th%p chZ t+o truc
T+ q
d D ≥ 3
√ M tdD
0,1[ σ ]=
3√ 4613450,1.70 =40,39mmChn N7&' mm
T+ C
d% ≥
3
√
M td%
0,1 [ σ ]=
3
√ 474364,364
0,1.70 =40,76mm
Chn NC7&' mm
T+ v$ s
ThHo t"# ch#Mn chn Ns7N739 mm
c. Truc III `>?# r
( Tinh phn !Vc !"n cac g tV
T9'n$
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⟹{ Ry=− F r2 . (!31−!33)+ F r# . !c32
!31
=−1726,35 (224−152 )+8939,37.94
224=3196,4 N
R Ay= Ry+ F r2+ F r#=3196,4+1726,35+8939,37=13862 N
Trong mU t phjng
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( Tinh mômHn tEng >Eng t+ cac tZt N" n tr"n ch-# N$ truc
tinh mômHn #n tng M $=√ M $y2 + M $#
2
mômHn tEng >Eng M td$=√ M $2+0,75T $
2
qo >
M tdA=√ M A#2 + M Ay
2 +0,75T A2=√ 840300,782+0+0,75.981849,9072=1195461 Nmm
M tdD=√ M D#2+ M Dy
2+0,75T D
2=√ 4 85852,82+231734,6 42+0,75.981849,9072=1006367,
M td% =√ M %#2 + M %y
2 +0,75T % 2=√ 0+0+0,75.981849,9072=850306,96 Nmm
981849,907
N
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( Tinh >EFng Ginh truc t+ cac tZt N" n
T c công th2c
d $ ≥3
√ M td$0,1[σ ]
Trong > 456 !$ 2ng 0#t cho ph%p c th%p chZ t+o truc
T+ s
d A ≥ 3
√ M tdA
0,1 [ σ ] =
3√ 11954610,1.70 =55,48mmChn Ns7'O mm
T+ q
d D ≥ 3
√ M tdD
0,1[ σ ]=
3√ 1006367,6350,1.70 =52,38mmChn Nq7'' mm
T+ C
d% ≥3
√ M td%
0,1 [σ ]=
3√ 850306,960,1.70 =49,5mmChn NC7'9 mm
T+
ThHo t"# ch#Mn chn Ns7N7'' mm
'. m ngh" m truc v- >ô ,-n m( v t !" # th%p C&' tô c th" n
)* h+n ,-n σ b=750 MPa
* σ −1 7 `9J&B9J' σ b 7 399B38' :Q L t chn σ −1=¿ 3'9 :Q
@(1 7 `9JAAB9JA' σ b 7 1'B1O8J' :Q L t chn @(1 7 189 :p
( Tr ,ng 19.O trng 3A 0ach Yc 0w thZt GZ ma/_ c tac g Kg#/ễn xy# ô c t>Ezc h" 0 Zn t p tr#ng t trng 5 7AJ9' :pL @71JP
( x" 0 Zn nh hEwng c 2ng 0#t tr#ng ,XnhJ v* th%p cac,on m-m
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{5 79J9' L {@ 7 9
( Khi t9%! Y%(& n$6(=nh !h 4h1=3 n'8i t9%! D(W3 the' 4ie@% 4 !'= 4e8th13 v1=i D(W3 then. Kie@< t9( 2'" 6e5n
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σ m$=0 ' σ a$= M $
( $
( ;ng 0#t thHo ch# GX m+ch >ô ng Gh truc |#/ 1 ch-#
τ m$=0 ' τ a$= T $2( 0
( ac >Dnh h" 0 5N} v$ @N} t+ cac tZt N" n ng#/ hm
) σd$=
) σ
* σ + ) #−1
) y
) τd$=
) τ
*τ + )
#−1
) y
*
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• * truc c rRnh thHn Tr ,ng 19.O trng 3A 0ach Yc 0w thZt GZ ma/_ c tac g Kg#/ễn xy# ô c t >Ezch" 0 Zn t p tr#ng t trng 5 7AJ9' :pL @71JPTr ,ng 19.3 trng 39 0ach Yc 0w thZt GZ ma/_ c tac g Kg#/ễn xy# ô c t >Ezc•5 v$ •@ 2ng v* >EFng Ginh t+ cac tZt N" n ng#/ hm
TW > Dnh >Ezc cac t€ 0 ) σ
*σ + à ) τ
* τ t+ cac rRnh thHn tr"n cac tZt N" n n$/
Cac t€ 0 ) σ
*σ + à
) τ
* τ tinh thHo truc !=p c >ô Nô v$ truc c rRnh thHnJ GZt
|# n$o !*n hn thX Nng > tinh 5N v$ @N
T9%! III II I Tie8tie"n
C C C
+/ +/ + + + +/
+, +, +, +, +/ +
( ac >Dnh h" 0 n to$n
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T9'n$ 2'=# aSb V he" '8 (n t'(:n !h' 3he=3. Th'ân$ thö1:n$
aSb /E X *E 4hi t(>n$ 2'" !ö=n$# aSb *E X -nhö v("& 4h'ân$ !(5n 4ie@< n$hie"< ve5 2'" !ö=n$ t9%!J.
‚5} v$ ‚@} !$ h" 0 n to$n chƒ ô
,-n mJ v* th%p cr,on m-m - σ =0,05 L - τ =0
p ,ng thông 0
T9%
!
Tie8t
ie"n (mm)
T&; '8 T&; '8
R(Znhthen
F(W3!(>n$
R(Znhthen
F(W3!(>n$
I
B * V **E V /,E*-E
/E
/
/
E/
C * **E **E */- /,E*-E
**-
VE
E
-E * **E *E- /,E *,*-
*-
,-
*-
II
C E * **E * /,E*E
*E
-E
-
E/
*
/ E * **E * /,E
*E
*E
-E/
-+,
III
A E V *,E V */E*E
**E
*,
E-*
*-
EE *E- *,E *E */E*E
*,E
E*
-E*
C E+ *E- *,E *E */E*E
* VE
E
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Ke8t Y%(; 4ie@< n$ie"< he" '8 (n t'(:n !h' th(8& !(=! 2'(nt9%! 2e5% th'(Z
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τ =T ma#
0,2.d3=
426881,244
0,2. 453 =23,42 MPa
σ td=√ σ 2+3 τ 2=52[σ ]
• T9% c III
σ = M ma#
0,1d3=
840300,78
0,1.553 =50,5 MPa
τ = T ma#
0,2.d3 =
981849,907
0,2.553 =29,5 MPa
σ td=√ σ 2+3 τ 2=71,8[σ ]
/ c 3 truc >-# th„ mRn >ô ,-n tfnh
8. m ngh" m >ô ,-n c thHn)1=i !(=! tie8t ie"n t9%! %:n$
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E - / EE &AOO1JA&& , */E/
III EE E
/ /+ 981849,907 /+E **E
C E+ E/ /+ 981849,907 //EE *
† v* thHn !$m ,‡ng th%p C&' !=p tr"n truc hô p gm tcJ hô p gm tc !$m v" c
v* tc >ô tr#ng ,Xnh v > p nhˆ thX 4σ d67 139B1O9 :pL 4τ c ¿ 7P9 :Q
/ tt c m gh%p thHn >-# >m ,o >ô ,- N p v$ c=t.