NGHIEN cuu-TRAO 001
^ DONG LUC HOC SUNG PHONG LUU XM 174E1-MY
DYNAMIC OF XM 174E1 LAUNCH GUN-U.S ARMY
TS Trin Quoc Trinh, KS Du-ong Hai Son Hoc vien Ky thuat Quan sir
TOM TAT
Bdi bda trinh bdy mpi sd ddc trung ddng hpc vd tinh loan ddng luc hoc ciia siingXM 174E1 cl nong 40 mm ciia My. Bac diem khde biet cua loai sung ndy v&i cdc Ipgi sung phdng luu khde la jiing Idm viec tu dong theo nguyen ly khoa ndng tu do, kit hap dan M406HE cao dp-thdp dp (vU khi Hi ddng). Kit qud nghien cini co thi diing di phuc vu cho cdc buac tinh todn dip theo khi tinh dao dong ciia Sling.
Tir khoa.- MTD, XMl74E1. dong hpc, ddng luc hoc...
ABSTRACT
The paper presents some kinetic features and dynamic of XM 174E1 launch gun-U.S army Characteris of this gun are automatic reload kind pffree-bplt and usedM406 HE hi-low pressure bullet The results of research can use for next calculation whith calculatian oscillate of gun.
Keywords: Automatic mechanic, XM 174E1, kinetic, dynamic...
1. DAT VAN DE ddi ta, vi vay cin tinh toan l^i dao ddng ciia siing Sling phdng luu hen thanh XM 174E1 ca '^""^ nhu kidm nghiem viec lip ti-en gia mdi. Hie.
ndng 40 mm do My san xuit va trang hi cho quan ™'^' * ' " M406HE chiing ta da san xuit dupe vi dpi My la mdt siing cd hda lire manh, siing dung *""8 dung diin nay. Vide giai bai tpan nay giup gia ba chan va nhidu chi tiet dupe san xuit tu hpp chp phin thay ddi gia siing bing gia ba chan cili kim nhdm rit gon nhe. Siing nay khi thu duac tit siing PKMS hoac gia siing tren xuong, d td duijc chien Ipi pham sau chien tranh cp thd thay ddi dl dang, cd the khai thac siing tdt ban trpng A gia Sling de tien khai thac trpng trang bi ciia quan kien Viet Nam
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NGHIEN cuu-TRAODOI
Hinh 1. Siing phdng luu lien thanh XM 174E1.
2. NOI DUNG
2.1. Cac dac trung chuyen dgng ciia cac khau trong may tu- dong
; 2.1.1. Phuong trinh chuyen dong ciia khau ca i sffkhi liti vd khi day ten [IJ [2]
Phan tich ket cau ciia siing phdng luu lien ' thanh XM 174E1 ta thay may tu ddng lam viec theo CO cau cam loai 1, chpn diem tiep xiic giiia hai khau A va B lam diem dat khdi lupng thu gpn M^ va Mg Ap dung nguyen ly Dalambe, ta lap phuang trinh chuyen ddng ciia chat diem A va ciia chat diem B cd dang:
dt dt --Rn-F„
Ap dung nguyen ly di chuyen kha dl dpi vdi truang hap lien ket ly tudng ta duoc
R^.dX = Rj ds Ma: Vj= ds/dt, V^=dX/dt =>
R V=R„.V„
J/^ V 1 • W^PTr^TTTTVTTTrT?
Hinh 2. So do hec tdc dung cua ca cdu cam logi 1.
Thuc te lien ket khdng phai la ly tudng, do dd ta phai dua vao hieu suat TI va phuong trinh tren cd dang
'^.R,.V-K.V^^R=-^
Anh hudng ciia khau lam viec den chuyen ddng cua khau co sd duoc tinh den qua khdi luang thu gon, luc thu gpn
: K dK^
(Mg.V^=£^^^) ri dX truyen K thay ddi.
Luc quan tinh do ti sd
* Phucmg trinh chuyen dong cua khod ndng - khdu ca sa:
Phuang trinh vi phan chuyen ddng tdng quat ciia MTD cd dang:
i=i Tii dt , . , Tii dx
-s^
Trong dd:
K^, V\^ - Ty sd truyen, hieu suat tu khau lam viec thii i den khau co sd;
M^, F^ - Khdi luong va ngoai luc tac dung len khau i,
n - Sd luong khau lam viec
+ Vdi Sling phdng luu lien thanh XM 174E1 trong qua trinh liii, khoa ndng chuyen ddng dudi tac dung ciia ap luc khi thudc, luc ma sat giiia vd dan va budng dan, luc ciia Id xo day ve, luc can cua Id xo CO cau tiep dan, co cau giuong biia F|^|^.
Do dd, phuang trinh chuyen ddng ciia khoa ndng khi liii cd dang:
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NGHIEN CIIU-TRAODOI
( M , + ^ . M , „ ) . ^ -
Tl,^, dr ' dX^.
= p.S-F -F.-F.. '•^.F,^,
Trong do S - Dien tich tilt dien Idng ndng;
M ^ - Khdi lupng cua khoa ndng, M^^, - Khdi luong tuong duong cua khau; K,^ , T] - Ty sd truyin va hieu suat cua ca cau tiep dan;T^j - Luc can cua co cau tiep dan; X^, W^ - Quang dudng, van tdc chuyen ddng ciia khoa ndng, F^^ - Luc ma sat giiia vd dan va budng dan, Yl Q- LUC nen ban dau ciia Id xo day ve; F,^^ Ylo+ C^.X^ - Luc can ciia Id xo day len khi liii, F|^j^= F^^+ C^.Xj^^^ - Luc ciia Id xo biia; C^ - Do ciing tuang duong ciia Id xo bua; F^^ - Luc nen ban dau ciia Id xo biia
Ta cd F^^j dupe tinh theo d-X/dt-
Qua bien ddi ta duac phuong trinh vi phan chuyen ddng cd dang sau
T,.f d X , , .dX.2 ^
* Khi day len, khoa ndng chiu tac dung cua cac luc* Id xo day ve, luc can ciia co cau tach dan nen phuang trinh chuyen ddng cua khoa ndng khi day len cd dang:
H M „ „ . K ' n,j2 •(ff..
\l2
Ta cd: ¥^^ dupc tinh thep d^X/dt' Qua bidn ddi ta dupc phuang trinh vi phan chuydn ddng cd dang sau:
M. . d X ,
K , = -
D l xac dinh ty sa truyen ta cd the xac djnl b i n g phuang phap giai tich theo cdng thiic:
d X , ^ Vi^, Sau khi xay dung md hinh co d X V
hoc ta cd the xac dinh A, tuong ling vai AX dS chpn, tu do xac dinh dupc K .
b. Xdc dinh hieu suat cua cdc ccfcau cam Ta cd hieu suit truyen ddng giiia cac khau nhu sau- -n = — ^ . K
Dd xac dinh hieu suat T| cua cac cp ciiu cam gi&a cac khau ta can xac dinh ty sd truyen K, hpp cac luc can R'g va lire day R'^. Tach Uen k^t rdi chieu cac luc tren phuang chuyen ddng ciia chiing, khi dp'
R ' B _ CCS ex ~ 2.f. sin a — f ^ . cos cc R ' A sin ot + 2.f.COS (X — f .sin a
l - 2 . f . t g a - f ^ t8oi + 2 . f - f ^ . t g a Theo dinh nghia ve hieu suit ta cd.
l - 2 . f . K - f ^ R ' A
.K =
K + 2 . f - f ^ . K
- M , 2 - ( ^ ) ' = = Q 2 2.1.2. Xac ^nhty s6 truyen va hieu suh lien kit
«. Xdc dinh ti so truyin
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Bd qua dai lupng chiia f ^ ta cd:
1 - 2.f . K „
•n = .K K + 2.f
2.2. Tinh toan d o n g lire hoc ciia M T D 2.2.1. CdcgidthiSt
a. Cdc gidi thiet cho bdi toan thugt phdng trong - Thudc phdng chay theo quy luat hinh hpc - Cac qua trinh xay ra tipng Idng ndng khdng anh hudng tdi su chay cua thudc phdng trong budng cap ap va khdng anh hudng tdi qua trinh phut khi qua Ipa phut.
- Khdng CP cac phan tii thudc phdng chua chay hdt phut ra khdi loa phut.
2014
NGHIEN cuu-TRAO DOI - Thudc phdng trong budng dot tuan theo quy
lu|t tdc dp chay ty le thu|n u = u,p
- Dan chuyen ddng dudi tac dung ciia ap suat trung binh P.
- Thanh phan ciia san pham chay (khi thudc) khdng thay ddi trong sudt qua trinh chay, vi vay cac tri sd C^, C^, a, 9... deu la cac tri sd trung binh khdng thay ddi theo thdi gian chay.
- Tdn that nhiet trong budng cao ap duoc tinh theo bieu thiic nhiet dd tuong ddi trung binh theo tirng gia thi cua \^ la: T^ = 1-^—:—vdi a^ 0,3,
b = 0,5. l + bi^
- Khi thudc trong budng cao ap la tinh, do vay tai mdi thai diem coi ap suat khi thudc p^, nhiet dp T, the tich rieng W^ va mat dp khi p^ la nhu nhau d moi thdi diem trong budng cao ap.
- Ddi vdi thdi ky thii nhat ciia bien tuong bin trong budng ddt sii dung qua trinh dang nhiet, qua trinh khi thudc phut qua loa phut la doan nhiet.
- Su chuyen ddng cua ddng khi trong loa phut la dn djnh mdt chieu.
- Mat do khi trong Idng ndng khdng ddi doc theo long ndng tai mdi thdi diem.
b. Cdc gid thiit cho bdi toan mdy tu dong - Khoa ndng boat ddng dudi tac dung cua luc kill thudc tac ddng thdng qua day vd dan.
- Luc ma sat duoc tinh la tong cac luc ma sat ye mat.
- Ki din luc ciia Id xo khda ndng.
- K6 den luc quan tinh cua khda ndng.
2.2.2. Hephieang trinh viphan
H. He phifong trinh vi phan thugt phdng rong vd dgc diem
Dac di§m ndi bat bien tuong ban cua vu khi
±i ddng la:
- Ap suat true ti^p tac dung len thanh ndng TAP
sung rat nhd, nhd ban hang chuc lan so vol ap suat khi thudc trong budng ddt
- Luong khi thudc trong long ndng ludn duac bd sung tu budng ddt qua loa phut trong sudt qua trinh chay ciia thudc phdng va keo dai cho den khi ap suat trong budng ddt va trong Idng ndng bang nhau.
- Su cd mat ciia loa phut cho phep dieu chinh ddng chay khi trong ndng nen ap suat trong ndng thay ddi nhd. Loa phut bien ddi dang ke va nhanh chdng bien nhiet nang ciia khi thudc thanh ddng nang va tac dung xung va dap ciia khi thudc khi phut qua loa phut vao day dan cho phep nang cao hieu suat nhiet ciia VKKD.
- Trong VKKD be sd sii dung dan vi trpng lupng thudc phdng cao ban cac loai vu khi khac Thudc phdng sii dung thudng cd be day chay nhd, do chay trong mdi trudng cd ap suat kha Idn, qua trinh chay se xay ra rat nhanh va chi dien ra trong budng ddt Day la dieu kien dam bao tan mat tdc dd dau ndng cua dan nhd ban cac loai vii khi khac
- Do tac dung cua loa phut, chuyen ddng ciia ddng khi trong long ndng VKKD khac vdi siing phao thdng thudng tdc do ddng khi giam tii mieng loa phut den day dan cdn ap suat khi tang dan len.
- Cac loai VKKD ndi chung deu cd uy luc nhd (v^ nhd) mudn tang uy luc can tang khdi luang thudc phdng song khi dd ap suat trong budng ddt se rat Idn, dieu nay bi ban che bdi dd ben cua vat lieu budng ddt
So do nguyen ly cau tao cua vii khi khi ddng:
Hinh 3. Sa do nguyen ly cdu tgo cua vU khi khi dgng:
1) Khoa nong; 2) Buong cao dp; 3) Thuoc phong;
4) Loa phut; 5) Buong thdp dp; 6) Nong; 7) Dgn.
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NGHIEN cuu-TRAO DOI He phupng trinh vi phan thuat phdng trong
dz _ p^ df_
~di~T,' dt~^
dr\_^(f2Xo^Sj(p^^p^
dt (o..y/.T(,
5
dt dt dx^
dt
( l - x , ) . i ^ - ( t - l ) . . , . ^
dt dt_
dt T)
W^ = Wg,-OLCO.ri + S.i
dv ^ S.p,.g di ^).q Cac thdng sd cau tao ciia siing la:
1^= 3,035 [dm] - Chieu dai ndng;
1 = 2,75 [dm] - Chieu dai dan chuyen ddng trong ndng;
L^^ = 0,385 [dm] - Chieu dai buong dan;
X^^^= 1,76 [dm] - Chieu dai hanh trinh ciia khoa ndng;
^ = 1 - Ddi vdi khoa ndng tu do Trong qua trinh nit vd dan va liii, khi diu dan da ra khdi ndng, khoa ndng van ti^p tuc lui dudi tac dung ciia ap luc khi thudc dan nd thoat ra khdi mieng ndng. Ap suit khi thudc trong budng thap ap dupc tinh theo cdng thiic Bravin: p , =p e"^'
Trong dd: p^ - Ap suat diu ndng, I - Thdi gian khi dan ra khdi mieng ndng;
A - He sd duac xac dinh. A ^^^^^
b. He phuang trinh viphan cho may ttrdSng Phuang trinh vi phan tang quat may tu dgng nhu sau:
MJ- dt "• dt '
(P-0.5).ti).Vj V^ - Van toe dau ndng;
P - He sd tac dung sau ciing cua khi thudc 1"^' "^y ^ ^^''^i tiong thdi ky tac dung sau ciing cua khi thuoc: f ,., dK
Dd giai phuang trinh vi phan tien, ta dua ve phuang trinh vi phan bac mdt bang each dat: iXJ dt=V
Tir dd, ta cd he phuong trinh vi phan tdng
= 1,5.A /Pd-L'.g~1276_
L'- i,^ - Chieu dai ndng
2.2.3. Kit qua tinh toan
Kit qud tinh todn tgi mot sd vi tri dgc biet:
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NGHIEN cuu-TRAODOI
P„ = 400[KG/cm')], Vj =7626,342 [cm/s];
Ket qua xuit ra dd thi, X^„(t), VJt).
- So tdc diu ndng dat: Vf= 76,2 [m/s]
- Ap suat Idn nhat trong ndng tai budng cap ap P,„„= 400KG/cm2
- V | n tdc khda ndng cudi hanh trinh liii:
^47.0= 1.6 [m/s]
- Tinh chu trinh lam vide ciia phat ban va tdc dp b i n ly thuyet.
Hinh 4. Dd thi quang duirng chuyen ddng cua khda ndng.
Vay chu trinh lam viec cua may tu ddng khi chua lap co cau dieu khi^n b^n loat la
^Z = hu + ^«, + ipk = 0.546+ 0.001 + 0.0236 = 0.571 [s]
Toe dd bin ly thuyet: V = — = ^ ^ ^ = 105 [phat/phiit]
3. K E T QUA VA NHAN X E T
Ket qua rinh toan kiem nghiem tuong ddi phii hop vdi sd lieu thuc te duoc cdng bd. Cd the dung nd de lam thdng tin dau vao cho cac phan tinh toan tiep theo khi tinh toan dao ddng ciia toan siing Vdi ket qua nay khi thay gia ba chan ciia My bang gia ba chan ciia siing PKMS thi cd the de dang kiem nghiem dn dinh cua Sling •
Ngay nhan bai; 22/10/2013 Hgiy phan bien: 25/11/2013
Vgifdi p h a n bif n : TS. Dao Van Doan, Hpc vien Ky thuat Quan su
r a i lieu t h a m k h a o :
1]. Pham Huy Chuong, Giao trinh Ca sd kit cdu vd tinh todn thiit ki mdy tu ddng, NXB. Hgc vien Ky thuat 3uansu(I998)
2] Nguyen Van Thanh, Thuyet minh nghien cim khoa hoc. Hoc vien K\ thuat Quan su (2013).
3]. Nguyen Quang Luong, Bai gidng thugt phdng trong (phan vii khi khi dong), Hgc vien Ky thuat Quan su (2013).
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