{"id":190,"date":"2009-03-24T03:39:44","date_gmt":"2005-04-15T16:23:19","guid":{"rendered":"http:\/\/vafs.dungnq.local\/2005\/04\/15\/xay-dung-mo-hinh-dong-dang-nghien-cuu-may-lam-dat-trong-rung\/"},"modified":"2019-09-25T09:53:05","modified_gmt":"2019-09-25T02:53:05","slug":"xay-dung-mo-hinh-dong-dang-nghien-cuu-may-lam-dat-trong-rung","status":"publish","type":"post","link":"https:\/\/vafs.gov.vn\/vn\/xay-dung-mo-hinh-dong-dang-nghien-cuu-may-lam-dat-trong-rung\/","title":{"rendered":"X\u00e2y d\u1ef1ng m\u00f4 h\u00ecnh \u0111\u1ed3ng d\u1ea1ng nghi\u00ean c\u1ee9u m\u00e1y l\u00e0m \u0111\u1ea5t tr\u1ed3ng r\u1eebng"},"content":{"rendered":"

Nguy\u1ec5n Can <\/em><\/strong><\/h1>\n

Vi\u1ec7n Khoa h\u1ecdc L\u00e2m nghi\u1ec7p Vi\u1ec7t Nam<\/em><\/h1>\n

Ph\u01b0\u01a1ng ti\u1ec7n c\u01a1 gi\u1edbi ho\u00e1 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong l\u00e0m \u0111\u1ea5t tr\u1ed3ng r\u1eebng \u1edf mi\u1ec3n B\u1eafc n\u01b0\u1edbc ta th\u01b0\u1eddng l\u00e0 m\u00e1y k\u00e9o x\u00edch c\u00f4ng su\u1ea5t l\u1edbn li\u00ean h\u1ee3p v\u1edbi l\u01b0\u1ee1i \u1ee7i ho\u1eb7c d\u00e0n c\u00e0o v\u00e0 d\u00e0n c\u00e0y ng\u1ea7m; \u0110\u1ed9 s\u00e2u c\u00e0y c\u1ea7n \u0111\u1ea1t \u0111\u01b0\u1ee3c t\u1eeb 0,4-0,7m, hi\u1ec7n tr\u01b0\u1eddng l\u00e0m \u0111\u1ea5t c\u00f3 \u0111\u1ed9 d\u1ed1c tr\u00ean 10 \u0111\u1ed9. Trong \u0111i\u1ec1u ki\u1ec7n l\u00e0m vi\u1ec7c n\u1eb7ng n\u1ec1 n\u00f3i tr\u00ean, c\u00e1c qu\u00e1 tr\u00ecnh \u0111\u1ed9ng l\u1ef1c h\u1ecdc c\u1ee7a li\u00ean hi\u1ec7p m\u00e1y di\u1ec5n ra r\u1ea5t ph\u1ee9c t\u1ea1p.<\/p>\n

Khi nghi\u00ean c\u1ee9u \u0111\u1ed9ng l\u1ef1c h\u1ecdc c\u1ee7a li\u00ean h\u1ee3p m\u00e1y l\u00e0m \u0111\u1ea5t tr\u1ed3ng r\u1eebng, ph\u01b0\u01a1ng ph\u00e1p th\u1eed nghi\u1ec7m tr\u00ean v\u1eadt th\u1ef1c v\u00e0 hi\u1ec7n tr\u01b0\u1eddng th\u1ef1c r\u1ea5t kh\u00f3 th\u1ef1c hi\u1ec7n v\u00ec chi ph\u00ed th\u1eed nghi\u1ec7m l\u1edbn v\u00e0 c\u00f3 th\u1ec3 x\u1ea9y ra tai n\u1ea1n cho ng\u01b0\u1eddi v\u00e0 m\u00e1y n\u1ebfu \u0111\u1ed9 d\u1ed1c, v\u1eadn t\u1ed1c… khi th\u1eed nghi\u1ec7m v\u01b0\u1ee3t qu\u00e1 gi\u1edbi h\u1ea1n an to\u00e0n.<\/p>\n

\u0110\u1ec3 kh\u1eafc ph\u1ee5c kh\u00f3 kh\u0103n n\u00e0y, ch\u00fang ta c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p nghi\u00ean c\u1ee9u tr\u00ean m\u00f4 h\u00ecnh \u0111\u1ed3ng d\u1ea1ng: Ph\u01b0\u01a1ng ph\u00e1p nghi\u00ean c\u1ee9u m\u00f4 h\u00ecnh l\u00e0 ph\u01b0\u01a1ng ph\u00e1p nghi\u00ean c\u1ee9u c\u00e1c hi\u1ec7n t\u01b0\u1ee3ng c\u1ee7a m\u1ed9t v\u1eadt th\u1ef1c, th\u00f4ng qua vi\u1ec7c nghi\u00ean c\u1ee9u c\u00e1c hi\u1ec7n t\u01b0\u1ee3ng x\u1ea9y ra tr\u00ean m\u00f4 h\u00ecnh c\u1ee7a n\u00f3. C\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng c\u1ee7a c\u00e1c hi\u1ec7n t\u01b0\u1ee3ng \u0111o \u0111\u01b0\u1ee3c tr\u00ean m\u00f4 h\u00ecnh s\u1ebd d\u00f9ng \u0111\u1ec3 suy ra c\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng tr\u00ean v\u1eadt th\u1ef1c.<\/p>\n

Trong qu\u00e1 tr\u00ecnh nghi\u00ean c\u1ee9u v\u1ea5n \u0111\u1ec1 “S\u1ef1 d\u1ecbch chuy\u1ec3n ngang v\u00e0 xoay c\u1ee7a li\u00ean h\u1ee3p m\u00e1y khi c\u00e0y ng\u1ea7m tr\u00ean s\u01b0\u1eddn d\u1ed1c<\/strong>“, ch\u00fang t\u00f4i \u0111\u00e3 x\u00e2y d\u1ef1ng v\u00e0 s\u1eed d\u1ee5ng m\u1ed9t m\u00f4 h\u00ecnh \u0111\u1ed3ng d\u1ea1ng li\u00ean h\u1ee3p m\u00e1y k\u00e9o v\u00e0 hi\u1ec7n tr\u01b0\u1eddng; M\u00f4 h\u00ecnh \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng thu\u1ed9c lo\u1ea1i “\u0110\u1ed3ng d\u1ea1ng \u0111\u1ed9ng l\u1ef1c h\u1ecdc m\u1ed9t ph\u1ea7n”.<\/p>\n

1. Ph\u01b0\u01a1ng ph\u00e1p t\u00ednh to\u00e1n thi\u1ebft k\u1ebf m\u00f4 h\u00ecnh \u0111\u1ed3ng d\u1ea1ng<\/strong><\/p>\n

C\u01a1 s\u1edf t\u00ednh to\u00e1n m\u00f4 h\u00ecnh \u0111\u1ed3ng d\u1ea1ng l\u00e0 l\u00fd thuy\u1ebft th\u1ee9 nguy\u00ean v\u00e0 l\u00fd thuy\u1ebft m\u00f4 h\u00ecnh. Kh\u00e1ini\u1ec7m ban \u0111\u1ea7u d\u00f9ng trong \u0111\u1ed3ng d\u1ea1ng l\u00e0 “<\/strong>Chu\u1ea9n s\u1ed1 \u0111\u1ed3ng d\u1ea1ng”<\/strong>(k\u00fd hi\u1ec7u l\u00e0 Pk<\/sub>), l\u00e0 t\u1ef7 s\u1ed1 gi\u1eefa m\u1ed9t \u0111\u1ea1i l\u01b0\u1ee3ng (k\u00fd hi\u1ec7u l\u00e0 Ak) n\u00e0o \u0111\u00f3 v\u1edbi m\u1ed9t hay t\u1eadp h\u1ee3p \u0111\u1ea1i l\u01b0\u1ee3ng kh\u00e1c (k\u00fd hi\u1ec7u l\u00e0 Ak\u2019<\/sub>) c\u1ee7a c\u00e1c hi\u1ec7n t\u01b0\u1ee3ng x\u1ea9y ra.<\/p>\n

Pk <\/sub>= Ak \/ Ak\u2019<\/sub> (1)<\/p>\n

\u0110\u1ec3 \u0111\u1ea3m b\u1ea3o y\u00eau c\u1ea7u \u0111\u1ed3ng d\u1ea1ng, c\u00e1c chu\u1ea9n s\u1ed1 \u0111\u1ed3ng d\u1ea1ng c\u1ee7a m\u00f4 h\u00ecnh (k\u00fd hi\u1ec7u l\u00e0 PkM <\/sub>) v\u00e0 v\u1eadt th\u1ef1c (k\u00fd hi\u1ec7u l\u00e0 PkV<\/sub>) ph\u1ea3i \u0111\u1ed3ng nh\u1ea5t (PkM <\/sub>= PkV <\/sub>). Tuy nhi\u00ean khi m\u00f4 h\u00ecnh thu\u1ed9c lo\u1ea1i \u0111\u1ed3ng d\u1ea1ng kh\u00f4ng to\u00e0n ph\u1ea7n, th\u00ec ch\u1ec9 c\u00f3 m\u1ed9t s\u1ed1 chu\u1ea9n s\u1ed1 \u0111\u1ed3ng nh\u1ea5t. V\u1edbi m\u00f4 h\u00ecnh \u0111\u1ed3ng d\u1ea1ng \u0111\u1ed9ng l\u1ef1c h\u1ecdc, s\u1ef1 \u0111\u1ed3ng nh\u1ea5t c\u1ee7a c\u00e1c chu\u1ea9n s\u1ed1 \u0111\u1ed9ng l\u1ef1c h\u1ecdc y\u00eau c\u1ea7u ph\u1ea3i \u0111\u01b0\u1ee3c \u0111\u1ea3m b\u1ea3o.<\/p>\n

\u0110\u1ec3 bi\u1ec3u di\u1ec5n \u0111\u01a1n v\u1ecb \u0111o l\u01b0\u1eddng c\u1ee7a m\u1ed9t \u0111\u1ea1i l\u01b0\u1ee3ng n\u00e0o \u0111\u00f3, ch\u00fang ta c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng “C\u00f4ng th\u1ee9c th\u1ee9 nguy\u00ean” <\/strong>(k\u00fd hi\u1ec7u l\u00e0 T):Th\u1ee9 nguy\u00ean c\u1ee7a \u0111\u1ea1i l\u01b0\u1ee3ng n\u00e0o \u0111\u00f3 c\u00f3 th\u1ec3 bi\u1ec3u di\u1ec5n th\u00e0nh c\u00f4ng th\u1ee9c theo ba \u0111\u01a1n v\u1ecb c\u01a1 b\u1ea3n l\u00e0 kh\u1ed1i l\u01b0\u1ee3ng (kg), chi\u1ec1u d\u00e0i (m) v\u00e0 th\u1eddi gian (s). V\u00ed d\u1ee5 g\u1ecdi Ag l\u00e0 \u0111\u1ea1i l\u01b0\u1ee3ng gia t\u1ed1c chuy\u1ec3n \u0111\u1ed9ng th\u1eb3ng (th\u1ee9 nguy\u00ean l\u00e0 kg.m\/s2<\/sup>), c\u00f4ng th\u1ee9c th\u1ee9 nguy\u00ean l\u00e0:<\/p>\n

Tg = kg1<\/sup>.m1<\/sup>.s-2<\/sup><\/p>\n

“H\u1ec7 s\u1ed1 \u0111\u1ed3ng d\u1ea1ng<\/strong>“<\/strong>(k\u00fd hi\u1ec7u l\u00e0 Hk)c\u1ee7a m\u1ed9t \u0111\u1ea1i l\u01b0\u1ee3ng Ak n\u00e0o \u0111\u00f3, l\u00e0 t\u1ef7 l\u1ec7 gi\u1eefa \u0111\u1ea1i l\u01b0\u1ee3ng AkN n\u00e0o \u0111\u00f3 c\u1ee7a v\u1eadt th\u1ef1c v\u1edbi c\u00f9ng \u0111\u1ea1i l\u01b0\u1ee3ng \u0111\u00f3 AkM c\u1ee7a m\u00f4 h\u00ecnh:<\/p>\n

Hk = AkN \/ AkM (2)<\/p>\n

H\u1ec7 s\u1ed1 \u0111\u1ed3ng d\u1ea1ng Hk l\u00e0 c\u01a1 s\u1edf \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh c\u00e1c th\u00f4ng s\u1ed1 k\u1ebft c\u1ea5u (k\u00edch th\u01b0\u1edbc, kh\u1ed1i l\u01b0\u1ee3ng, c\u00f4ng su\u1ea5t \u0111\u1ed9ng c\u01a1 … c\u1ee7a m\u00f4 h\u00ecnh tr\u00ean c\u01a1 s\u1edf c\u1ee7a v\u1eadt th\u1ef1c \u0111\u00e3 c\u00f3, \u0111\u1ed3ng th\u1eddi \u0111\u1ec3 chuy\u1ec3n \u0111\u1ed5i s\u1ed1 li\u1ec7u nghi\u00ean c\u1ee9u tr\u00ean m\u00f4 h\u00ecnh sang v\u1eadt th\u1ef1c.<\/p>\n

C\u00e1ch t\u00ecm c\u00e1c h\u1ec7 s\u1ed1 \u0111\u1ed3ng d\u1ea1ng Hk<\/strong>nh\u01b0 sau: <\/strong>Theo l\u00fd thuy\u1ebft \u0111\u1ed3ng d\u1ea1ng v\u00e0 m\u00f4 h\u00ecnh, h\u1ec7 s\u1ed1 \u0111\u1ed3ng d\u1ea1ng Hk c\u1ee7a m\u1ed9t \u0111\u1ea1i l\u01b0\u1ee3ng Ak n\u00e0o \u0111\u00f3, c\u00f3 th\u1ec3 suy ra t\u1eeb h\u1ec7 s\u1ed1 \u0111\u1ed3ng d\u1ea1ng c\u01a1 b\u1ea3n (k\u00fd hi\u1ec7u l\u00e0 Ha, Hb, Hc) c\u1ee7a ba \u0111\u1ea1i l\u01b0\u1ee3ng c\u01a1 b\u1ea3n Aa, Ab, Acch\u1ecdn tr\u01b0\u1edbc, sau khi \u0111\u00e3 n\u00e2ng l\u00ean m\u1ed9t lu\u1ef9 th\u1eeba (s\u1ed1 m\u0169 ik, jk, qk) nh\u1ea5t \u0111\u1ecbnh:<\/p>\n

Hk = Haik. Hbjk. Hcqk(3)<\/p>\n

\u0110\u1eb3ng th\u1ee9c tr\u00ean v\u1eabn \u0111\u00fang n\u1ebfu ta thay c\u00e1c h\u1ec7 s\u1ed1 \u0111\u1ed3ng d\u1ea1ng H c\u1ee7a m\u1ed7i \u0111\u1ea1i l\u01b0\u1ee3ng A b\u1eb1ng c\u00e1c c\u00f4ng th\u1ee9c th\u1ee9 nguy\u00ean T t\u01b0\u01a1ng \u1ee9ng:<\/p>\n

Tk = Taik. Tbjk. Tcqk(4)<\/p>\n

\u0110\u1eb3ng th\u1ee9c (4) ph\u1ea3i tho\u1ea3 m\u00e3n hai \u0111i\u1ec1u ki\u1ec7n sau:<\/p>\n

– C\u00e1c s\u1ed1 m\u0169 trong c\u00f4ng th\u1ee9c th\u1ee9 nguy\u00ean Ta, Tb, Tc c\u1ee7a ba \u0111\u1ea1i l\u01b0\u1ee3ng c\u01a1 b\u1ea3n ph\u1ea3i t\u1ea1o th\u00e0nh m\u1ed9t \u0111\u1ecbnh th\u1ee9c kh\u00e1c kh\u00f4ng:<\/p>\n

– C\u00e1c s\u1ed1 m\u0169 ik,jk, qk ph\u1ea3i l\u00e0m cho t\u1ed5ng s\u1ed1 m\u0169 c\u1ee7a ba \u0111\u01a1n v\u1ecb c\u01a1 b\u1ea3n (kg, m, s) \u1edf hai v\u1ebf c\u1ee7a \u0111\u1eb3ng th\u1ee9c (4) b\u1eb1ng nhau.<\/p>\n

2. T\u00ednh to\u00e1n m\u00f4 h\u00ecnh \u0111\u1ed3ng d\u1ea1ng cho \u0110\u1ec1 t\u00e0i<\/strong><\/p>\n

C\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng c\u1ea7n t\u00ecm c\u1ee7a m\u00f4 h\u00ecnh trong \u0110\u1ec1 t\u00e0i nghi\u00ean c\u1ee9u l\u00e0 chuy\u1ec3n \u0111\u1ed9ng d\u1ecdc, ngang v\u00e0 xoay c\u1ee7a li\u00ean h\u1ee3p m\u00e1y tr\u00ean m\u1eb7t \u0111\u1ea5t (x, y, j), ch\u00fang l\u00e0 h\u00e0m s\u1ed1 c\u1ee7a c\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng \u0111\u1ea7u v\u00e0o g\u1ed3m: Tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a to\u00e0n li\u00ean h\u1ee3p m\u00e1y (G), giat\u1ed1c r\u01a1i t\u1ef1 do (g), c\u00e1c k\u00edch th\u01b0\u1edbc d\u00e0i c\u1ee7a li\u00ean h\u1ee3p m\u00e1y (B), v\u1eadnt\u1ed1c li\u00ean h\u1ee3p m\u00e1y (V), c\u00e1c l\u1ef1c c\u1ee7a m\u00f4i \u0111\u1ea5t t\u00e1c \u0111\u1ed9ng v\u00e0o li\u00ean h\u1ee3p m\u00e1y (P) v.v.<\/p>\n

Ch\u1ecdn ba \u0111\u1ea1i l\u01b0\u1ee3ng c\u01a1 b\u1ea3n cho vi\u1ec7c t\u00ednh to\u00e1n l\u00e0: Gia t\u1ed1c r\u01a1i t\u1ef1 do g, tr\u1ecdng l\u01b0\u1ee3ng G, k\u00edch th\u01b0\u1edbc d\u00e0i B. Gi\u00e1 tr\u1ecb ba h\u1ec7 s\u1ed1 \u0111\u1ed3ng d\u1ea1ng c\u01a1 b\u1ea3n \u0111\u01b0\u1ee3c ch\u1ecdn nh\u01b0 trong bi\u1ec3u 1.<\/p>\n

T\u1eeb c\u00e1c h\u1ec7 s\u1ed1 \u0111\u1ed3ng d\u1ea1ng c\u01a1 b\u1ea3n \u0111\u00e3 ch\u1ecdn, theo c\u00e1ch n\u00eau tr\u00ean ta s\u1ebd t\u00ednh \u0111\u01b0\u1ee3c c\u00e1c gi\u00e1 tr\u1ecb c\u1ee7a h\u1ec7 s\u1ed1 \u0111\u1ed3ng d\u1ea1ng Hkkh\u00e1c, k\u1ebft qu\u1ea3 n\u00eau trong bi\u1ec3u 1:<\/p>\n

Bi\u1ec3u 1 X\u00e1c \u0111\u1ecbnh c\u00e1c h\u1ec7 s\u1ed1 \u0111\u1ed3ng d\u1ea1ng Hk c\u1ee7a m\u00f4 h\u00ecnh<\/strong><\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
TT<\/td>\n\u0110\u1ea1i l\u01b0\u1ee3ng<\/p>\n

(Ak)<\/td>\n

H\u1ec7 s\u1ed1 \u0111\u1ed3ng d\u1ea1ng (Hk)<\/td>\n\u0110\u1eb3ng th\u1ee9c (3)<\/p>\n

Hk =ghik<\/sup>.Gh jk<\/sup>.Bh qk<\/sup><\/td>\n

H\u1ec7 s\u1ed1<\/p>\n

Hk<\/td>\n<\/tr>\n

1<\/td>\nGia t\u1ed1c r\u01a1i t\u1ef1 do g<\/td>\ngh<\/td>\nCh\u1ecdn<\/td>\n1<\/td>\n<\/tr>\n
2<\/td>\n\n

Tr\u1ecdng l\u01b0\u1ee3ng G<\/h1>\n<\/td>\n

Gh<\/td>\nCh\u1ecdn<\/td>\n0,001<\/td>\n<\/tr>\n
3<\/td>\nK\u00edch th\u01b0\u1edbc d\u00e0i B<\/td>\nBh<\/td>\nCh\u1ecdn<\/td>\n0,1<\/td>\n<\/tr>\n
4<\/td>\nGia t\u1ed1c x” , y”<\/td>\nx” h<\/sub>, y” h<\/sub><\/td>\nx” h<\/sub> = y” h<\/sub> = gh<\/td>\n1<\/td>\n<\/tr>\n
5<\/td>\nH\u1ec7 s\u1ed1 c\u1ea3n m\u1ea5u x\u00edch k<\/td>\nkh<\/td>\nkh = Gh \/ Bh 2<\/sup><\/td>\n0,1<\/td>\n<\/tr>\n
6<\/td>\nV\u1eadn t\u1ed1c l\u00fd thuy\u1ebft Vlt<\/td>\nVh<\/td>\nVh =(gh.Bh) 0.5<\/sup><\/td>\n0,32<\/td>\n<\/tr>\n
7<\/td>\nH\u1ec7 s\u1ed1 b\u00e1m v\u1edbi x\u00edch tr\u01a1n w<\/td>\nwh<\/td>\nwh = 1<\/td>\n1<\/td>\n<\/tr>\n
8<\/td>\nNgo\u1ea1i l\u1ef1c t\u00e1c \u0111\u1ed9ng P<\/td>\nPh<\/td>\nPh = Gh<\/td>\n0,001<\/td>\n<\/tr>\n
9<\/td>\nG\u00f3c nghi\u00eang n\u1ec1n \u0111\u1ea5t b<\/td>\nbh<\/sub><\/td>\nb=1<\/td>\n1<\/td>\n<\/tr>\n
10<\/td>\nKh\u1ed1i l\u01b0\u1ee3ng M<\/td>\nMh<\/td>\nMh = Gh \/ gh<\/td>\n0,001<\/td>\n<\/tr>\n
11<\/td>\nGia t\u1ed1c chuy\u1ec3n v\u1ecb xoay j”<\/td>\nj”h<\/sub><\/td>\nj”h<\/sub>= gh \/ Bh<\/td>\n10<\/td>\n<\/tr>\n
12<\/td>\nC\u00f4ng su\u1ea5t \u0111\u1ed9ng c\u01a1 N<\/td>\nNh<\/td>\nNh = Gh.(gh.Bh)0.5<\/sup><\/td>\n0,0032<\/td>\n<\/tr>\n
13<\/td>\nTh\u1eddi gian t<\/td>\nth<\/td>\nth = (Bh\/gh) 0.5<\/sup><\/td>\n0,32<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

3. Thi\u1ebft k\u1ebf ch\u1ebf t\u1ea1o m\u00f4 h\u00ecnh<\/strong><\/p>\n

V\u1eadt th\u1ef1c \u0111\u01b0\u1ee3c l\u1ef1a ch\u1ecdn l\u00e0 li\u00ean h\u1ee3p m\u00e1y Komatsu D65 A-8, c\u00e1c th\u00f4ng s\u1ed1 ch\u00ednh sau khi t\u00ednh to\u00e1n n\u00eau trong bi\u1ec3u 2.<\/p>\n

K\u1ebft c\u1ea5u c\u1ee7a m\u00f4 h\u00ecnh l\u00e0 m\u1ed9t v\u1eadt c\u00f3 th\u1ec3 t\u1ef1 chuy\u1ec3n \u0111\u1ed9ng tr\u00ean m\u1eb7t n\u1ec1n, v\u1edbi c\u00e1c c\u1ee5m nh\u01b0 sau:<\/p>\n

– Khung th\u00e9p l\u00e0 c\u01a1 s\u1edf \u0111\u1ec3 l\u1eafp \u0111\u1eb7t c\u00e1c c\u1ee5m c\u1ee7a m\u00f4 h\u00ecnh;<\/p>\n

– \u0110\u1ed9ng c\u01a1 \u0111i\u1ec7n l\u00e0 \u0111\u1ed9ng l\u1ef1c c\u1ee7a m\u00f4 h\u00ecnh li\u00ean h\u1ee3p m\u00e1y;<\/p>\n

– C\u01a1 c\u1ea5u truy\u1ec1n \u0111\u1ed9ng: Chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a \u0111\u1ed9ng c\u01a1 \u0111i\u1ec7n \u0111\u01b0\u1ee3c truy\u1ec1n qua hai c\u1eb7p b\u00e1nh r\u0103ng v\u00e0 m\u1ed9t \u0111\u00f4i pu ly \u0111ai t\u1edbi hai tr\u1ee5c c\u1ee7a b\u00e1nh sao ch\u1ee7 \u0111\u1ed9ng. T\u1ef7 s\u1ed1 truy\u1ec1n \u0111\u1ea3m b\u1ea3o v\u1eadn t\u1ed1c trung b\u00ecnh c\u1ee7a m\u00f4 h\u00ecnh l\u00e0 0,32 m\/s;<\/p>\n

– C\u01a1 c\u1ea5u di chuy\u1ec3n: Hai b\u00e1nh sao d\u1eabn \u0111\u1ed9ng hai gi\u1ea3i x\u00edch hai b\u00ean, m\u1ed7i gi\u1ea3i x\u00edch \u0111\u01b0\u1ee3c c\u0103ng b\u1edfi m\u1ed9t b\u00e1nh c\u0103ng x\u00edch;<\/p>\n

– C\u01a1 c\u1ea5u c\u00f4ng t\u00e1c: Ph\u00eda tr\u01b0\u1edbc khung l\u00e0 h\u00ecnh t\u01b0\u1ee3ng tr\u01b0ng c\u1ee7a c\u1ee5m c\u00e0o, ph\u00eda sau khung l\u1eafp m\u1ed9t gi\u00e1 \u0111\u1eb7t c\u00f3 th\u1ec3 l\u1eafp 01 \u2013 03 tr\u1ee5 c\u1ea7y, chi\u1ec1u s\u00e2u tr\u1ee5 c\u1ea7y c\u00f3 th\u1ec3 \u0111i\u1ec1u ch\u1ec9nh \u0111\u01b0\u1ee3c;<\/p>\n

Bi\u1ec3u 2. C\u00e1c th\u00f4ng s\u1ed1 ch\u00ednh c\u1ee7a m\u00f4 h\u00ecnh Komatsu D 65A-8<\/strong><\/p>\n\n\n\n\n\n\n\n\n\n\n
T<\/strong><\/p>\n

T<\/strong><\/td>\n

T\u00ean th\u00f4ng s\u1ed1<\/strong><\/p>\n

(Ak)<\/strong><\/td>\n

Th\u1ee9 nguy\u00ean <\/strong><\/td>\nH\u1ec7 s\u1ed1 Hk<\/strong><\/td>\nGi\u00e1 tr\u1ecb Ak<\/strong><\/td>\n<\/tr>\n
T\u00ean<\/strong><\/td>\nGi\u00e1 tr\u1ecb<\/strong><\/td>\nV\u1eadt th\u1ef1c <\/strong><\/td>\nM\u00f4 h\u00ecnh<\/strong><\/td>\n<\/tr>\n
1<\/td>\nChi\u1ec1u d\u00e0i max c\u1ee7a LHM<\/td>\nm<\/td>\nBh<\/td>\n0,1<\/td>\n6,680<\/td>\n0,668<\/td>\n<\/tr>\n
2<\/td>\nChi\u1ec1u r\u1ed9ng max c\u1ee7a LHM<\/td>\nm<\/td>\nBh<\/td>\n0,1<\/td>\n3,590<\/td>\n0,359<\/td>\n<\/tr>\n
3<\/td>\nKh\u1ed1i l\u01b0\u1ee3ng to\u00e0n b\u1ed9 LHM<\/td>\nkg<\/td>\nMh<\/td>\n0,001<\/td>\n18000<\/td>\n18<\/td>\n<\/tr>\n
4<\/td>\nT\u1ed1c \u0111\u1ed9 l\u00fd thuy\u1ebft Vlt<\/td>\nm \/s<\/td>\nVh<\/td>\n0,32<\/td>\n1<\/td>\n0,32<\/td>\n<\/tr>\n
5<\/td>\nT\u1ec9 s\u1ed1 truy\u1ec1n \u0111\u1ed9ng c\u01a1 \/b\u00e1nh sao<\/td>\n1<\/td>\n24,2<\/td>\n<\/tr>\n
6<\/td>\nC\u00f4ng su\u1ea5t th\u1ef1c c\u1ee7a \u0111\u1ed9ng c\u01a1<\/td>\nkg.m2<\/sup> \/s3<\/sup><\/td>\nNh<\/td>\n0,200<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

M\u00f4 h\u00ecnh c\u1ee7a li\u00ean h\u1ee3p m\u00e1y l\u00e0 ph\u1ea7n ch\u1ee7 y\u1ebfu c\u1ee7a m\u00f4 h\u00ecnh; Ngo\u00e0i ra c\u00f2n m\u00f4 h\u00ecnh c\u1ee7a n\u1ec1n \u0111\u1ea5t, c\u00f3 t\u00ednh to\u00e1n v\u00e0 thi\u1ebft k\u1ebf \u0111\u01a1n gi\u1ea3n h\u01a1n, c\u00f3 hai ph\u01b0\u01a1ng \u00e1n m\u00f4 h\u00ecnh n\u1ec1n l\u00e0:<\/p>\n

– N\u1ec1n th\u1ef1c tr\u00ean hi\u1ec7n tr\u01b0\u1eddng thu nh\u1ecf v\u1edbi \u0111\u1ea5t n\u1ec1n \u0111\u01b0\u1ee3c c\u1ea3i t\u1ea1o cho b\u1eb1ng ph\u1eb3ng, lo\u1ea1i tr\u1eeb v\u1eadt c\u1ea3n b\u1ea5t ng\u1edd, v\u00e0 gi\u1ea3m \u0111\u1ed9 c\u1ee9ng \u0111\u1ea5t.<\/p>\n

– S\u00e0n \u0111\u1eb7t tr\u00ean gi\u00e1 c\u00f3 th\u1ec3 thay \u0111\u1ed5i \u0111\u1ed9 d\u1ed1c, \u0111\u1ed5 \u0111\u1ea5t \u0111\u00e3 c\u1ea3i t\u1ea1o v\u00e0 tinh l\u1ecdc.<\/p>\n

H\u00ecnh 1. M\u00f4 h\u00ecnh li\u00ean h\u1ee3p m\u00e1y sau khi ch\u1ebf t\u1ea1o<\/em><\/strong><\/h2>\n

4. K\u1ebft lu\u1eadn<\/strong><\/p>\n

M\u00f4 h\u00ecnh \u0111\u1ed3ng d\u1ea1ng c\u1ee7a li\u00ean h\u1ee3p m\u00e1y k\u00e9o x\u00edch Komatsu D65A \u20138 \u0111\u00e3 \u0111\u01b0\u1ee3c ch\u1ebf t\u1ea1o t\u1ea1i Vi\u1ec7n Khoa h\u1ecdc L\u00e2m nghi\u1ec7p v\u00e0 th\u1eed nghi\u1ec7m tr\u00ean m\u00f4 h\u00ecnh hi\u1ec7n tr\u01b0\u1eddng thu nh\u1ecf t\u1ea1i tr\u01b0\u1eddng \u0110\u1ea1i h\u1ecdc L\u00e2m nghi\u1ec7p v\u00e0o \u0111\u1ea7u n\u0103m 2002. K\u1ebft qu\u1ea3 kh\u1ea3o nghi\u1ec7m tr\u00ean m\u00f4 h\u00ecnh \u0111\u1ed3ng d\u1ea1ng \u0111\u00e3 b\u1ed5 xung cho k\u1ebft qu\u1ea3 th\u00ed nghi\u1ec7m tr\u00ean li\u00ean h\u1ee3p m\u00e1y th\u1ef1c, v\u00e0 ki\u1ec3m nghi\u1ec7m k\u1ebft qu\u1ea3 t\u00ednh to\u00e1n tr\u00ean m\u00f4 h\u00ecnh to\u00e1n h\u1ecdc, khi nghi\u00ean c\u1ee9u \u0111\u1ed9ng l\u1ef1c h\u1ecdc c\u1ee7a li\u00ean h\u1ee3p m\u00e1y k\u00e9o x\u00edch khi l\u00e0m \u0111\u1ea5t tr\u1ed3ng r\u1eebng tr\u00ean s\u01b0\u1eddn \u0111\u1ea5t d\u1ed1c.<\/p>\n

K\u1ebft qu\u1ea3 th\u00ed nghi\u1ec7m cho th\u1ea5y m\u00f4 h\u00ecnh l\u00e0m vi\u1ec7c t\u1ed1t v\u00e0 chi ph\u00ed th\u00ed nghi\u1ec7m th\u1ea5p h\u01a1n nhi\u1ec1u so v\u1edbi th\u00ed nghi\u1ec7m tr\u00ean li\u00ean h\u1ee3p m\u00e1y th\u1ef1c.<\/p>\n

T\u00e0i li\u1ec7u tham kh\u1ea3o ch\u00ednh:<\/strong><\/p>\n

    \n
  1. Ph\u1ea1m V\u0103n Lang: “\u0110\u1ed3ng d\u1ea1ng- M\u00f4 h\u00ecnh- Th\u1ee9 nguy\u00ean \u1ee9ng d\u1ee5ng trong k\u1ef9 thu\u1eadt c\u01a1 \u0111i\u1ec7n n\u00f4ng nghi\u1ec7p”, Nh\u00e0 xu\u1ea5t b\u1ea3n N\u00f4ng nghi\u1ec7p, H\u00e0 N\u1ed9i 1996;<\/li>\n
  2. “C\u00e1c Ph\u01b0\u01a1ng ph\u00e1p nghi\u00ean c\u1ee9u khoa h\u1ecdc\u2019, Gi\u00e1o tr\u00ecnh \u0110\u1ea1i h\u1ecdc B\u00e1ch khoa, H\u00e0 N\u1ed9i, 1993;<\/li>\n<\/ol>\n

    3. C\u00e1c katalor s\u1eed d\u1ee5ng v\u00e0 ph\u1ee5 t\u00f9ng m\u00e1y k\u00e9o KOMASHU D 65 – A8;<\/p>\n

      \n
    1. ?. ?. ????? – ??????????? ???????? ?????????????????? ????????? – ????????? 1970.<\/li>\n<\/ol>\n

      Summary :<\/em><\/strong><\/h1>\n

      One Dummy tractor was calculated and manufactured for studying of dynamics of track tractors, which are operating on slope site of Forest’s activities.<\/em><\/p>\n

      Unit theory and similar theory serve as a base for the calculation of dummy’s similar coefficient. Similar coefficients are calculated on the basis of analysis and comparison between triple exponents of base unit (kilogram, meter, second) with their three initially selected quantities. <\/em>Initial results of the experiment show that Dummy worked well and costs of the experiment were much lower, compared to those of real tractor.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

      Ph\u01b0\u01a1ng ti\u1ec7n c\u01a1 gi\u1edbi hoá \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong làm \u0111\u1ea5t tr\u1ed3ng r\u1eebng \u1edf mi\u1ec3n B\u1eafc n\u01b0\u1edbc ta th\u01b0\u1eddng là máy kéo xích công su\u1ea5t l\u1edbn liên h\u1ee3p v\u1edbi l\u01b0\u1ee1i \u1ee7i ho\u1eb7c dàn cào và dàn cày ng\u1ea7m; \u0110\u1ed9 sâu cày c\u1ea7n \u0111\u1ea1t \u0111\u01b0\u1ee3c t\u1eeb 0,4-0,7m, hi\u1ec7n tr\u01b0\u1eddng làm \u0111\u1ea5t có \u0111\u1ed9 d\u1ed1c trên 10 \u0111\u1ed9. Trong \u0111i\u1ec1u ki\u1ec7n làm vi\u1ec7c n\u1eb7ng n\u1ec1 nói trên, các quá trình \u0111\u1ed9ng l\u1ef1c h\u1ecdc c\u1ee7a liên hi\u1ec7p máy di\u1ec5n ra r\u1ea5t ph\u1ee9c t\u1ea1p. <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[18],"tags":[],"_links":{"self":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/190"}],"collection":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/comments?post=190"}],"version-history":[{"count":6,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/190\/revisions"}],"predecessor-version":[{"id":19235,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/190\/revisions\/19235"}],"wp:attachment":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/media?parent=190"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/categories?post=190"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/tags?post=190"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}