bai giang cnctm thong so hinh hoc
TRANSCRIPT
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BI GING: THNG S HNH HCPHN CT DAO TIN KHI THIT K
Trnh by & thc hin:
BI NGC ANH
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MC TIU DY HC
Sau bi hc ny ngi hc c khnng sau:
Kin thc: Trnh by c ccthng s hnh hc hp l ca daotin v Phn bit c cc gc dao tin. K nng: V c chnh xc ccthng s hnh hc ca dao tin. Thi : Rn luyn tnh cn thnv pht trin t duy k thut.
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NI DUNG BI GING
I.Khi qut chung v thngs hnh hc ca dao tin.
II.Cc gc ca dao tin. III.Cu hi bi tp cng c
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I.Khi qut chung v thngs hnh hc ca dao tin
Qu trnh thit k, thng s hnh hc ca daoc xt trong hai tit din chnh N-N v tit
din ph N1-N1, v phoi thng c thot ratheo cc phng ca tit din , ko theocc hin tng vt l xy ra trong qu trnhct.
Trong tit din chnh ta c cc gc chnh, trongtit din ph ta c cc gc ph.
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I.Khi qut chung v thngs hnh hc ca dao tin
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I.Khi qut chung v thngs hnh hc ca dao tin
Thng s hnh hc cadao mt ct N-N ti
im B bt k trn lict ( dao c li ct
ngang tm)
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I.Khi qut chung v thngs hnh hc ca dao tin
Thng s hnh hc cadao mt ct N-N timi dao ( dao c li
ct ngang tm)
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II.Cc gc ca dao tin
1.Cc gc ly trn mtphng tit din chnh 2.Cc gc ly trn mtphng tit din ph 3.Cc gc ca li dao(Cc gc c xc nhtrn mt phng y) 4.Gc ly trn mt phngct ( Gc nng )
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1.Cc gc ly trn mtphng tit din chnh
a. Gc trc chnh
b. Gc sau chnh c. Gc sc chnh d. Gc ct chnh
e.Mi lin h giacc gc
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a.Gc trc chnh (gc thot phoi)
Gc trc chnh l gc gia mt trcv mt y o trong tit din chnh.
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a.Gc trc chnh (gc thot phoi)
Gc trc c tr s dngkhi mt trc thp hn mty, tr s m khi ngc li
v bng 0 khi mt trctrng mt y Gc c nh hng nqu trnh thot phoi khi ct Khi gc trc ln bindng phoi nh, vic thotphoi d dng, lc ct vcng tiu hao gim, nngsut tng.
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b. Gc sau chnh
Gc sau chnh lgc gia mt sauchnh v mt cto trong tit dinchnh.Gc lun lundng v c nhhng n vn ma st khi ct
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c. Gc sc chnh
Gc sc chnh lgc hp bi mttrc v mt sauchnh o trong titdin chnh.
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d.Gc ct chnh
Gc ct chnh lgc gia mt trcv mt ct o trongtit din chnh.
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e.Mi lin h gia cc gc
Gc v gc l hai gcc lp c chn trc tytheo yu cu gia cng (vt
liu, cht lng b mt giacng ), cn hai gc v l hai gc ph thuc vo gc
v .
Ta c + + = 900
= +
+ =90 0
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2.Cc gc ly trn mtphng tit din ph
a.Gc trc ph 1: l gcgia mt trc v mty o trong tit din ph.Gc 1 cng c th m,dng hoc bng khngtng t nh .
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2.Cc gc ly trn mtphng tit din ph
b. Gc sau ph 1: l gc gia mt sau ph v mtphng hp bi li ct ph v trc Z ti M1, o trong titdin ph. Gc 1 cng lun lun dng. c. Gc sc ph 1 : l gc gia mt trc v mt sau pho trong tit din ph. d. Gc ct ph 1 : l gc gia mt trc v mt phnghp bi li ct ph v trc Z ti M1, o trong tit dinph.
Ta c 1 + 1 + 1 = 90 0
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3.Cc gc ca li dao
a. Gc nghing chnh b. Gc nghing ph 1
c. Gc mi dao d. Quan h gia ccgc
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a. Gc nghing chnh
Gc nghing chnh: l gc gia hnh
chiu ca li ctchnh trn mt yv phng chydao.
Thc t dao tin c= 30 0 =>90 0
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b. Gc nghing ph 1
Gc nghing ph 1 l gc gia hnh
chiu ca li ctph trn mt y vphng chy dao. Thc t dao tin c
1 = 50 =>45 0
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c. Gc mi dao
Gc mi dao : lgc gia hnh
chiu ca li ctchnh v li ctph trn mt y.
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d. Quan h gia cc gc
Mi quan h hnhhc:
+ + 1 =1800
Trong v 1 lnhng thng s
c lp, cn lthng s phthuc.
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4.Gc nng cali ct chnh
Khi li ct chnhthng.Gc nng cali ct chnh
l gchp bi li ctchnh v hnh chiuca n trn mt
phng y o trnmt ct.
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4.Gc nng cali ct chnh
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4.Gc nng cali ct chnh
Khi li ct chnhcong, l gc ogia tip tuyn timt im bt k trnli ct chnh vhnh chiu ca n
trn mt phng y
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4.Gc nng cali ct chnh
Gc c th dng, m hay bng 0 v c nhhng n phng thot phoi.
Gc thng thng c gi tr t (-150
=>+150
)
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4.Gc nng cali ct chnh
dng khimi dao l imthp nht cali ct
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4.Gc nng cali ct chnh
m khi midao l im caonht ca lict
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4.Gc nng cali ct chnh
Khi li ct songsong vi mty th = 0
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III.Cu hi bi tp cng c
Dng tit din chnh v mt phng y biu dincc gc ,,, ,,, 1
GII BT1
GII BT2
GIIBT3
BT2
BT1
BT3
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GII BT1
CC BC THC HIN
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CC BC THC HIN
HINH B2B1 B3 B4
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GII BT2
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GII BT3
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TI LIU THAM KHO
[1] NGUYN NGC O- H VIT BNH- PHAN MINH THANH,C s cng ngh ch to my, H.S phm k thut TPHCM. [2] PHM NH TN, Nguyn l ct v dng c ct gt, TrngTHCN H Ni, NXB H Ni. [3] NGUYN TH TRANH TRN QUC VIT, Gio trnh c sct gt kim loi, H.Bch Khoa H. Nng.
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THE END
h t d
BI NGC ANH Email: [email protected]