NGHIEN cufu-TRAO D 6 |
NGHIEN CLTU HIEN TUgNG LECH PHA CUA HAI NONG KHI B A N LIEN THANH PHAO PHONG KHONG
HAI NONG 37mmK65
STUDY OF THE DEPHASING PHENOMENON OF 37M1VITIVIIN ANTI-AIR- CRAFT GUN TYPE 1965
Pham Hong Phong', Mai Qu6c Chien^
'Cyc Ky thudt, Qudn khu 3
^Hpc vien Phdng khdng Khdng qudn
TOM TAT
Bdi bdo trinh bdy nguyen nhdn hien tuang lech pha ciia hai ndng phdo phdng khdng 3 7mmK65, khi bdn lien thanh vd ca sd khoa hoc khdc phuc hien tugmg lech pha bdng ca cdu tdng dan bdn ddng thdi cho phdo. Kit qud thir nghiem dd gidm thieu su lich pha cita hai ndng. tdng do chinh xdc bdn vd chung td phuang phdp khdc phuc hien tuang lech pha bdng ca cdu tdng dan bdn ddng thai la dung ddn vd chinh xdc.
lix khda: Lech pha; Phdo phdng khdng 37mmK65.
ABSTRACT
In this paper the causes of the dephasing phenomenon of 37mm twin antiaircraft gun type 1965 and scientific bases to correct the phase difference were studied by manufacturing Cartridge ramming device which ensure the simultaneous firing of both barrels of 37mm twin antiaircraft gun type 1965. Test results have reduced the difference in phase of the two-barrel, increased firing accuracy and they have proven research method which is correct and accurate.
Keywords: Dephasing. 37mm twin anti-aircraft gun type 1965. '^
ISSN 0866 - 7056
TAP CHi CO KHi V I £ T NAM, Sd 6 ndm 2015 wwTv.cokhivietna m. vn
NGHIEN C I J U - T R A O D O I
l . D A T V A N D E
Phao phong khdng hai ndng 37mniK65 d nudc ta hien nay, ddng vai ttd quan ttpng va dugc qui hoach sii dung Idu dai ttong qudn dpi, dugc trang bi vdi sd lugng lon, deu do Trung Qudc san xudt. Tuy nhien, phao 37mmK65 ttang bi d Viet Nam khdng cd ca cau ty ddng tdng dan bdn ddng thdi khi bdn hen thanh nhu phdo cua Trung Qudc hien nay, nen gay ra hien tugng tan mat dgn khi bdn lam gidm hieu qud tieu diet myc tieu so vdi phdo Trung Qudc.
Nguyen nhdn ciia hien tugng lech pha do: Hai thdn phdo khdng tuyet ddi gidng nhau;
Cdc vien dan cung khdng hoan toan gidng nhau;
Cac sai sd tich lijy ttong khai thdc ddi vdi tiing thdn phao cung khac nhau...
- Tai thdi diem ap sudt khi thudc dat den dp sudt tdng dan p„, dai dgn dugc cdt vd dgn bit ddu cbuyen dgng.
- Sd mii dogn nhiet k=l+6, khdng ddi va bdng gia tri trung binh ciia no ttong khoang nhi?t do tir nhiet do chdy cua thudc ddn nhiet dp ciia thudc d thdi diem dgn ra khdi ndng.
b) Cdc gia thiit trong xay dipig h$ phuang trinh viphan chuyen dong
- Trir Id xo Id chi tiet ddn hdi ra, cac khau ttong may ty ddng coi la ran tuyet ddi, lien ket dpng vdi nhau, cd ty sd truyen bien thien.
- Cac khdu ttong mdy ty dpng chuyfin ddng song phang.
Vi vdy, cdn thidt phai tidn hdnh nghien - Dung khdi lugng thu gpn thay cho phan Cliu hien tugng lech pha cua hai ndng khi ban bd. Diem dat khdi Iugng thu gpn cd the thay ddi, lien thanh va tim ra giai phap ky thudt khdc phuc thudng la didm tidp xiic giiia hai khdu hodc diem hi$n ttrgng lech pha, triet tieu cdc sai lech sau dat ciia ngoai lyc tdc dyng.
mdi phdt ban.
2. BAI TOAN DQNG LV'C HOC PHAO PHONG KHONG 37MMK65
2.1. Cdc gia thiet cff ban a) Gid thiet thugt phdng trong
hinh hpc.
- Thudc phdng chdy theo qui ludt chdy
- Cdc cdng thli yeu cua khi thudc deu ty le vcri cdng chii yeu lam dgn chuyen ddng tinh tien va dugc tinh den bdi he sd tang ngng (p.
Todn bp lieu phdng chdy ttong dieu kien dp suat nhu nhau va bang ap sudt trung binh thugt phdng p.
Hinh 1. Sa do nguyen ly mdy tu dgng phdo 37mmK65:
1) Khoi liii; 2) May ham liii; 3) Khda ndng;
4) Ca cdu tdng dgn; 5) Ld xo tdng dgn; 6) Dgn;
7) Thoi dn dgn; 8) Mdng tong dgn
2.2. He phirvng trinh vi phan
- Thdnh phdn sdn phdm chay khdng ddi. a) He phuang trinh viphan thu^t phong trong [4,5]
ISSN 0866 - 7056
TAP CHi CO KHi VIET NAM, Sd 6 ndm 2015 www.cokhivietnam.vn
NGHIEN cufu-TRAOePi
dv dt' dl dt' dy/
''dt
-ft4.
A-ft
= ?2-
ps
ipjnj .V
T"
b) Hfphirfftig trtnh viphan chuyin dong cua mdy ttf dong 11,2]
- Khi than phao lui:
- Khi than phao day len:
( M . + ^K^ .dV„
> —^m)—-
n. dl
+«,7«=n-/(
2.3. Giai bai todn va ket qua
Su dung thuat toan Runghe-kuta gidi ddng thdi he phuang trinh thudt phdng ttong vd he phuang trinh vi phdn chuydn ddng ciia than phao vdi cdc tham sd thugt phdng cua dan vd tham sd ket cdu ciia mdy ty ddng hai ndng 37mmK65, ta dugc cdc quy Iugt dp sudt vd van tdc cua dau dgn d ttong ndng theo thdi gian vd quy ludt chuyen ddng ciia cac khau ttong mdy ty ddng theo hinh 2 vd 3.
Hinh 2: Dd thi thudt phdng trong
Hmh 3. Quy ludt chuyen dgng cua MTD
Tdc dp ban ly thuydt:
N.J. = — = ^161 (phdt /phiit) phu h a p '^ T^ 0.372 ^ F y F . F vdi tai lieu thidt kd tir 160 ddn 180 phdt/phiit
Tir ket qud dd thi, ta nhdn thdy neu dan va hai thdn phao hoan todn gidng nhau thi ttong qua trinh ban lien thanh hai thdn phao Ien xudng ddng nhip, hai ca cau tdng dgn ciing tdng dan ddng thdi. Tuy nhien, thyc te trong chd tao, khai thdc dgn va phao thi ban than cac vien dan khdc nhau, hai than phdo khdc nhau chu yeu lien quan den may ham Iui, Id xo ddy ve, bd phan tdng dgn va dp mdi mdn cua cac chi tidt,... lam cho hai thdn phdo bi lech pha khi bdn lien thanh. Chinh vi vdy, can phdi cd ca cau ty ddng tdng dan bdn ddng thdi khi ban lien thanh. Co cdu nay se khdc phuc, triet tieu cdc sai sd tich liiy sau mdi phat ban do cac sy sai khac tten.
3. GIAI PHAP KY THU AT THIET KE, CHE TAO CO CAU TlT DONG BAN DONG THOfI Yeu cdu ddi vdi co cdu: Khdc phuc dugc hien tugng lech pha khi bdn lien thanh; Do bdn va tin cdy cao; Thao ldp, bao dudng d l dang;
Bao ddm tinh kinh te ttong che tao va khai thac;
An toan ttong su dyng; Bao ddm tdc dp bdn ciia phao khdng ddi; Ddm bao quy trinh huan luyen sir dung phdo khdng thay ddi.
ISSN 0866 - 7056
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NGHIEN CUTU-TRAO Ddl
3.1. Md hinh nguyen K, c h l tao va lap r a p l^n phao
Sau khi khdo sdt co cdu cd bdn, mdt sd he thdng ty ddng bdn hai ndng ciia mdt sd phdo da ndng, ta xay dyng sa dd nguyen ly theo hmh 4 vd che tgo lap len phdo theo hinh 5.
Hinh 4. Sado nguyen ly
3.2. Thu* nghiem va k i t qua
Hinh 5. Ca cdu sau khi lap lin phdo
Thli nghiem bdn ddi chiing giGa hai phao: Su dung thidt bi do gia tdc mdt chigu ldp tten hai ndng phao de xdc dinh thdi diem tdng dan ciia hai ndng.
a) Do thi bien doi gia toe cua phao nguyen ban
Hinh 6. Dd thi bien ddi gia tdc cua phdo nguyen bdn
_ p u a n sat kat qua ta thdy sai lech sau mdi phdt bdn dugc tich liiy va khdng ttian theo mdt quy luat nhat dinh, da xdy i^ hien tugng lech pha ngdu nhien cua hai ndng. Kidm fra tdc do bdn thyc te ttung binh cua phao (N„): N^=60/T,=60/0,332=180phat/phut so vdi tinh toan ly thuyit 160-180 phat tten phut la phu hgp.
ISSN 0866 - 7056
TAP C H i CO KHI V I £ T NAM, Sd 6 nam 2015 www.cokhivietnam.vn
NGHIEN cufu - TRAO Ddl
b) d o thi bien doi gia toe cua phao da ISp c o c^u t u dong b^n ddng thoi
i t tf-tt' \ -
Hinh 7. Dd thi biin doi gia tdc ciia phdo da lap ca cdu tir ddng bdn ddng th&i
Tir dd thi, ta cd sai lech thdi diem tdng dan tudn theo quy ludt, cdc sai sd sau mdi phdt bdn dd dugc triet tieu. Kiem tra tdc dp bdn thyc te trung binh ciia phao (N^):
N„=60/T,j,=60/0,33-181 phdt/phiit, so vdi tinh toan ly thuydt 160-180 phat/phiit la phii hgp.
4. DANH GIA VA KET LUAN
Phao sau khi ldp co cdu ty dgng bdn ddng thdi boat ddng binh thudng. Cac chi tiet ciia c a cdu khdng hdng hde sau khi ban.
C a cdu ty ddng ban ddng thdi da lam gidm tdi da hien tupng tdng dgn va phdt hda so le ciia hai thdn phdo, do dd ldm gidm tdi da cudng dp dao ddng ciia than phao va cua mam phao khi ban lien thanh.
Sai lech ve thdi diem tdng dan vdo hai ndng phdo thay ddi d mien gid tri nhd va dn dinh a miic 1%, ttong khi phdo chua chua ldp ca cdu, gia tri nay bi cdng ddn, len tdi 6.3% so vdi chu ky phat bdn (0,33s/phat)._
Gia tdc Idn nhdt ciia mdm phdo gidm tir 80m/s- xudng cdn 40m/s^ tdng xung Iyc trung binh giam tir 60m/s^ xudng cdn 20m/s^.
Tu cdc k6t qud tren, chiing td phuang phap nghien ciiu va giai phap ky thudt tdng dan bdn ddng thdi Id hgp Iy va can thiet. Ket qua cua bai bao la mdt phdn ciia de tai ngliien ciiu khoa hpc dd dugc nghiem thu cap hpc vien; "Gidi phdp ky thudt tdng dgn bdn ddng thai phdo phdng khdng hai ndng 3 7mmK65". •!•
Ngay nhan bdi: 12/5/2015 Ngay phan bien: 10/6/2015 Tai lieu tham khao:
[1]. Pham Huy Chuang; Dgng lire hgc vU khi tu ddng. NXB. Hpc vien Ky thuat Quan sy (2002).
[2]. Phgm Huy Chuang; Gido trinh casd kef cdu vd tinh foan thiit ke may tu dgng. NXB. Hpc vien Ky thuat Quan sy (1998).
[3]. Khoa Phdo phong khong; Gido trinh Binh khi phdo phong khong 37mmK65. NXB. Hpc vien Phong khdng Khdng quan (1999).
[4].ttiaAKftifife¥^jgii^^MSP. ms^^im^im^-n^^^i^^u, i983.
[5]. Nguyin Ngpc Du, Dd Vdn Thp; Thugt phdng ciia siing phdo. Bai tdp thuat phong ttong. DHKTQS, 1976.
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