NGHIEN cufu-TRAO Ddl
^
ON OjNH NGANG CUA O TO KHI CHUYEN DONG QUAY VONG
^Ths. Dfldng Ngoc Van', TS. Nguyin Van Tra^
^Khoa Cd khi Ddng lflc - Trfldng Cao dang Ky thudt Cdng nghiep Bac Giang
^Bd mdn 0 td - Khoa Ddng lflc - Hpc vien Ky thudt Qudn sfl
TOM TAT
Trong qud trinh d td chuyen ddng quay vdng, sii mdt on dinh ngang co the xdy ra, diiu ndy ldm cho d to CO thebi lat ngang hodc trUdt ngang. Nhitng tdi lieu (ly thuyet 6 to; ly thuyit 6 td qudn sii...) chi nghiin ciiu on dinh ngang ciia d td khi coi d to Id mdt vdt tuyet ddi ciing chuyen dgng. Bdi bdo ndy nghien ciiu dnh hiidng cua he thdng treo, ldp din on dinh ngang cua 6 to trong qud trinh quay vdng.
ABSTRACT
This research is on the affect of the hanging system, tyres to the horizontal stability in the rollover progress 1. MO HINH T O A N H O C 6 TO KHI CHUYEN HI sd giam chan d ben phai va ben trdi bang
D O N G Q U A Y VONG nhau (K^p = K^^)
Dp cflng eua ldp bin phdi vd ben trdi la nhfl Cdc gia thilt cua bdi todn: nhau (Cj = C^^)
Vl tri trpng tdm eua khdi Iflpng phan treo vd Bdi todn dfldc khdo sdt trong mat phang thing khdng dflpc treo khdng thay ddi trong qua trinh d dflng vudng gdc vdi true dpc xe, cae bdnh xe cau td chuyin ddng quay vdng.
trfldc, sau dxiOc coi la mdt.
Kha nang bdm ngang eua cdc bdnh xe Id nhfl Vdi nhflng gid thilt tren, cd thi sfl dung nhau. md hinh sau di khao sat:
- O td ehuyin ddng diu (v= const) vd quay vdng deu (n= const, R=eonst), trln dfldng nam ngang (a = 0) va khdng cd map md (qi=0).
0 td khdng keo mode (P^j^^^O).
Lflc gid bin coi nhfl bang khdng (P =0).
Trpng tdm T. khdi lfldng treo vd khdng dfldc treo eua d td nam tren mat phang chfla true dpc d td va vudng gdc vdi mat dfldng.
- Mat dfldng ddng nhat, he sd can mpi dilm la nhfl nhau.
- Bd qua sfl biln dang ben va sfl giam chan cua ldp - Dp cflng eua he thdng treo ben phai va bin trai
nhfl nhau (C, =C,J Hinh l:Md hinh khao sdt
• ! •
TAP CHI CO KHI VIET NAM V Sd 03 (Thang 3 nam 2012)
NGHIEN cufu - TRAO DGI
2. HE PHUONG TRlNH CHUYDN D O N G
./•^l-V^I : md men qudn tinh khdi Iflg'ng phdn D l thudn ldi eho qud trinh tinh todn bdi kh5ng d\i(yc treo treo
bdo nay sfl dung phfldng phdp tdch riing khdi p . j ^ ^ . ly ^^^ \^i^^i \\i0r\g phdn khdng dflpc treo
lfldng treo vd khdng dflpc treo. , , , . . , , . *
^ : gdc nghiing ngang cua phan khong dflpc Khi tdch rieng khdi Iflpng phdn treo dflpc trei khi chuyin d^ng quay vdng
hy. khodng cdch tfl dilm ddt lflc bam ngang Y den trpng tdm khdi Iflg'ng khdng treo
h,: khodng each tfl vj tri liln kit gifla khdi Iflpng treo vd khdng treo vdi trpng tdm phdn khdng dflpc treo.
Vilt cdc phfldng trinh cdn bdng lflc vd mo men cdn bdng dflpc h | phfldng trinh chuyin dpng cua d td khi quay vdng (1)
(hinh 2;3).
Z2
i
T. <
I//.'
T T
U::]:^ ,\ f'^v-^ Ft> ^^
^ • 2 , ^^^
' > ' •
Hinh 2: Sd dd khdi Iflpng phan treo
Zl
^1 f.i •^f'' i^
P. - -Pcosy/- =0
PJi^=Q
(1) Jx2-h \^C2p^^K2p - ''c2r''K2,]T'°
p^^^p.co{v2-yy\-\=^
'"•^r^C2,-''K2,-^C2p-''K2p*''a,^^ap*'''^''2-^
JxA ^(^C2/ ^ ''KI, - ^C2p -^K2p } f •^^"^l ^
Chuyin dich tfldng ddi xdc dinh theo sd do (hinh 4)
^ C\p C\tJ 2 '^l Hinh 3: Sd do khdi lUdng khdng treo / \ / \ Trong dd:
F^^-. phdn lflc tai vi tri phan tfl dan hdi bin trdi Fj^-. phan lflc tai vi tri phdn tfl giam chan bin trdi F^2: phdn lflc tai vi tri phan tfl dan hdi ben phdi Fj^ : phdn lflc tai vi tri phan tfl gidm chdn bin phdi
J 2 •y^2 '• "^^ "^^" c^in tinh khdi lfldng phdn treo P^^2- Iv^c ly tdm khdi Iflg'ng phdn treo
P: phan lflc tai vi tri lien kit gifla khdi Iflpng treo va khdng treo
h^. khoang each gifla vi tri lien kit cua khdi Iflg'ng
treo va khdng treo vdi trpng tdm khdi lfldng phan *6n dinh tnidt ngang treo
l^
7A
L^L z,
A
z,'
fZip
Hinh 4: Sd do xdc dinh chuyin dich tfldng doi Sfl trfldt ngang xay ra khi thda man (2).
^2 '• goe nghieng ngang cua phan dfldc treo khi ehuyin ddng quay vdng
F^j'i phan lflc tai vi tri ldp ben trdi {Pcir^t) F^^^: phan lflc tai vi tri ldp ben phai (Fcip=Rp )
TAP CHf CO KHf VlfiT NAM • S6 03 (Thdng ^ "3m 9017^
1
Y = / > , -9 =C..Z .q> =C..-i-.y/,.(p b, n Cip n I Ip^n 1 9 In
(2)
NGHIEN cufu - TRAO D 6 I
Trong dd, (p la he sd bam ngang eua bdnh xe
*0n dinh lat ngang:
Sfl lat ngang eua xe khi ehuyen ddng quay vdng xay ra khi (3) thda man
Y =0 P
Y=Y =F^..(p =C,.Z^.(p =r.-^.y/^.(p (3) t max Clt^n I It^n 1 2 1 «
3. K H A O S A T O N DINH NGANG CUA XE UAZ- 469
Bdng thdng so cua xe UAZ- 469 TT
1 2 3 4 5 6
7 8 9 10 11 12 13 14 15
TfiN GQI Trpng Iflpng khdi lfldng phan treo
Trpng Iflpng khdi lfldng phdn khdng treo He sd ddn hdi eua ldp
Khoang cdch hai banh xe
HI sd cflng cua phan tfl dan hdi HI sd can eua gidm chan
Khoang cdch dat he thdng treo
Chilu eao trpng tdm khdi lfldng phan treo
Khoang cdch tfl vi tri ddt he thdng treo tdi trpng tdm khdi lfldng phan dxiOc treo
Khoang each tfl vi tri dat he thdng treo tdi trpng tdm khdi lfldng phan khdng dfldc treo
Md men qudn tinh phan dfldc treo
Md men qudn tinh phan khdng dfldc treo HI sd bam ngang
Van tdc cflc dai
Bdn kinh quay vdng nhd nhat
KY HlfiU
G2
G,
c.
\
c.
K.
K K K
\
Jx2 1x1
9 n
V max
R .
mm
GIATRI 8KN 7.4KN 40KN/m
1.8m 15.8KN/m
6.2KN- m 1.5m 0.6m 0.4m 0.3m 0.22KNm
0.2KNm 0.8 80 km/h
.1
6.7m ^j^
TAP CHf CO KHf VIET NAM V Sd 03 (Thang 3 nam 2012)
NGHIEN cufu - TRAO 06l
Mdi quan he gifla bdn kinh quay vdng vd v^n tdc trflpt l^t dflpc thi hi|n thdng qua dd thi sau:
1 ^ 1 ^ so
(km/hf
Hinh 5: Dd thi quan he gifla v^ ;v, va R Dd thi bilu dien mdi quan he gifla v^ ;v^
va i? chi ra rang khi tang dp cflng cua he thdng
tieo (nhip, Id xo) van tde gidi ban trflpt (v) vd vdn Tdi lieu tham khao:
tdc gidi ban lat (v) tang lln. Hiln tfldng lat xdy ra trfldc hiln tfldng trfldt, dilu ndy Id do khi tinh todn da bd qua biln dang bin cua ldp, sfl edn gidm chan cua ldp...
[1]. Nguyin Hflu Can, Dfl Qudc Thinh, Pham Minh Thdi, Nguyen Van Tdi, Ll Thi Vdng (2005), Ly thuylt d td mdy keo, NXB. Khoa hpc Ky thudt, Hd NOi.
4.KETLUAN
Bang phfldng phdp tdch d td thdnh khdi lfldng phan treo vd khdng treo, tfl dd, lap h | phfldng trinh vi phdn d l tinh todn. Kit qud thu dfldc mdi quan he gifla van tdc trflpt (v) va van tde lat (v) vdi bdn kinh quay vdng (R). Kit qud ndy eho thay sfl khdc biet vdi phfldng phdp khi tinh todn ma coi xe la mdt vat cflng tuy|t ddi ehuyin ddng.
Tuy nhien, bai todn mdi dp dung cho md hinh phang, bd qua anh hfldng cua sfl biln dang ben eua ldp, sfl can giam chan cua ldp, chfla k l din anh hfldng eua gid ben... Day la nhflng van dl can dfldc nghien cflu tilp. •
[2]. Nguyen Phuc Hilu (2001), Tinh ndng thdng qua cua d td, NXB. Quan dpi Nhan dan, Hd Npi.
[3]. Vu Dflc Ufp (1994), Dao dpng d td, Hpc vien Ky thudt Quan sfl. Ha Npi.
[4]. Vu Dflc Lap (2004), So tay tra cflu tinh nang ky thuat d td, Hpc vien Ky thuat Quan sfl, Hd Npi.
[5]. Nguyen Khac Trai (1997), Tinh dilu khiln va quy dao chuyin ddng cua d td, NXB. Giao thdng Van tai, Hd Ndi.
[6]. US. Department of transportation, Vehicle Dynamic Stability and RoUover, June 1992
TAP CHf CO KHf VlfiT NAM V So 03 (Thang 1 .,Srr» '7r^io\