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Taking into account entry conditions at t = 0, x = 0, x = 0 it is possible to define integration constants c and c2:
g (1 + cosg- f sing)-2 f 2g
c + c„ +-
®2(1 + cosg- f sing)2 + 4 f V (1 + cosg - f sing)®2A-g
- cos at -
-sincot -
R -
2 f a2
(pVg + Fm,i)(sin ß+ f cos ß)
= 0;
(cosg - f sing)ma ®\c¿Jf2 + (cosg- f sing) - f) + c2^f2 + (cosg- f sing)) (1 + cosg - f sing)®2A -g
2 f a2
R -
- = 0;
(pVg + Fm»i)(sin ß+ f cos ß)
(cosg - f sing)ma2
c - g(1 + cosg-fsing)-2f2g
2 a2(1 + cosg-fsing)2 + 4fV
(1 + cosg- f sing)®2 A - g .
---5—--—-- sin at;
2 f a1
g -(1 + cosg - f sing)®2A
cosat -
1
2f
R-
4 f V
(Pvg + F„P1)(sin ß+ f cos ß)
(cosg - f sing)ma g (1 + cosg- f sing) - 2 f 2g
®22(1 + cosg- f sing)2 + 4 f2®2
cosat +
(16)
(1 + cosg - f sing)a2A -g
sin at !> x
R -
(pVg + FmJ(sin ß + f cos ß)
(cosg - f sing)ma g (1 + cosg- f sing) - 2 f 2g
a1 (1 + cos g - f sin g )2 + 4 f 2 a (1 + cosg - f sing)a2A-g
cos at -
+ [
2 fa2
g-(1 + cosg - f sing)a2A
sin at S e
IV f 2+(cosg-f si
1
2f
R-
4 f 2a3
(PVg + FTP1)(sin ß+ f cos ß)
(cosg - f sing)ma g (1 + cosg- f sing) - 2 f2 g
(17)
a22 (1 + cos g - f sin g )2 + 4 f2a2
cos at -
(1 + cosg- f sing)a2A-g . +--5— .„ „ -- sin at
4 f a
f2 +(cosg- f sing) - f )]e + g (1 + cosg- f sing) - 2 f 2g a2 (1 + cos g - f sin g )2 + 4 f2a' (1 + cosg - f sing)a2A -g
-at [V f 2+(cosg-f sing )a2+f \
-cosat -
2fa2
sin at.
The analysis shows, that process dragging fibres ulyuk a tooth saw the cylinder from raw chambers saw fibre branch the second step occurs basically in the absence of movement of fibres on a surface of a tooth of a saw, at x = 0, x = 0; x = 0.
The law of movement of fibres ulyuk on a forward side of a tooth saw the cylinder has in the cores oscillatory parametre with frequency wt and amplitude, depends, a set of values of weight of a bunch of fibres ulyuk, factor of a friction and a corner of an arrangement of fibres concerning an axis saw the cylinder. Problem decisions it is numerically possible to define necessary conditions of weight in saw gin of the second step.
4 f V
x^ f2 + (cosg- f sing) - f). Delivering values Cj and c2 in (15) we will definitively receive expression describing movement of fibres ulyuk on a tooth surface saw the cylinder.
References:
Zikirjaev E. Z. Is primary clap-raw processing. To publish. Mehnat. - Tashkent, 1999. - 398 p. Dzhuraev A., etc. The Theory of mechanisms and cars. To publish. G. Guloma. - Tashkent, 2004. - 592 p. Bat M. I., etc. The Theoretical mechanics in examples and problems. To publish. A science. - M., 1964. - 664 p. Sobirov K., Dzhuraev A. Calculation of force of a friction of seeds about a grid-iron saw Z//Vestnik's TSTU gin, Mechanical engineering. - Tashkent, 2007. - № 2. - P. 88-91.
Djuraev Anvar Djuraevich, technical sciences associate, professor, Tashkent institute of textile and light industry, Uzbekistan E-mail: [email protected] Turdalieyv Vohidjon Maxsudovich, candidatefor technical sciences, Tashkent institute of textile and light industry
E-mail: [email protected] Qosimov Azamjon Adixamjonovich, senior scientific employee-researcher, Namangan Engineering Pedagogical Institute, Uzbekistan
Definition of movement laws of winging and milling drums of the unit for processing of soil and crops of seeds
Abstract: In article the settlement scheme and mathematical model of five-mass system of the combined unit for processing of soil and crops of seeds are resulted. On the basis of numerical decisions of system of the differential equations laws of
movement milling and wing unit shaft are received, graphic dependences of change of paramétrés of the combined unit for processing of soil and crops of seeds are defined and recommendations for choice rational values of parametres and modes of movement of working bodies are given.
Keywords: The combined unit, the settlement scheme, soil, processing, the differential equations, movement laws milling, wing a drum, seeds, angular speed, the moment.
In the basic economy in crops, the structure of the top layer of earth makes difficultly crushing lumps (diameter of 5 sm. and
We develop an effective design of the combined unit for preseeding processing of soil and crops of small seeds vegetable
more). This circumstance negatively influences to preparation of cultures [1]. The kinematic scheme of the combined unit is re-
soil and quality of crops of small seeds of cultures, and, also in further and their shoots.
sulted fig. 1, and the settlement scheme five mass machine units resulted fig. 2.
Fig. 1. The kinematic scheme of the combined unit: 1 - kardan; 2 - conic reducer; 3, 7, 9, 11 - chain drivers; 4, 6 - shaft; 5 - cylindrical gear wheel; 8 - winging drum; 10 - milling drum; 12 - basic wheel; 13 - shaft of the bobbin sowing device; 14 - skating rink
Fig. 2. The settlement scheme of the five-mass machine unit
According to fig. 2 the system of the differential equations, describing movement of weights of the machine unit of the car for processing of soil and crops of seeds [2] is deduced:
M = M -K
■ vom 1 dt
J + JJ"2 + Jr 2 + J1 + J. 2 ] * ^ = M ■ - Mf i --Ci (-u^)-4 d^
[((3 + J„ + Jl + J., ) + J4 + JH + JgX ] ■ ^ = Ui2Ci ( - UJ2 )
-C2 ( - Uf) - C2 ( - Uf) + U (^ - Ui2 ^
-B2 i f "U 23 f}- B2 f ^-U24 f ]-((1 + Mf 2 );
dt
dt
dt
(( + /r 5 + /.4 )■ ) = U 23C 2 (-U+ +U23a2 ( ^-U23 ^ % (M + Mw );
dt
dt
/.d %
d t2
= u 24c2 (-u ^ )-c
r2cos(^2/ + À^) r1cos^1 y j
-uJ-^ I-b
dt
dt
dt
r/COS(^// +À^>/)
TiCOsfii J dt j
- M ;
1V1 f4 '
(/■ + * 6 + J. ) ) =
dt2
r/COs(^27 + A&)
TiCOS^i
xC
X6,
^ V dt
TiCos& y y
TiCos^i y dt y
t2cos(^!î +A$2)
TiCos& y
_(Mf 5 + Mm ).
(1)
Where, M - moment on shaft VOM; M f„ M f 2, M f ,, M f 4, M f 5' vom ' f i ' f 2 ' f 3 ' f 4 ' f 5
the moments of forces a friction in corresponding shaft; Mw, Mm - the resistance moments on shaft wing and milling drums; ^, , ^, ^, -angular movings ofweights of the machine unit; /n, /T2, /T3, /4, /T5, /T6 -the moments of inertia of rotating shaft; /k, / - the moments of inertia of cogwheels of a conic reducer; /., / , /. , / , / , / - the moments of inertia ofasterisks ofchain transfers accordingly; /w - the-moment inertia wing a drum; /m - the moment of inertia of a milling drum; / p / 2 - the moments of inertia of cogwheels of a cylindrical gearing tooth; np -transfer relation of a conic reducer; Q, C3, C4, C5 -factors rigidity of chain transfers; 6P63,64,65 - factors viscosity chain
transfers; Up, UU,U2,,U24 - the transfer the relation between rotating in weights accordingly.
The decision of system (1) is made on the type COMPUTER «Pentium-IV». The problem dared with application of numerical method Runge-Kutta by means of the mathematical program «Math Cad». The decision was carried out at following numerical values of parameters: Mvom = i06i.6 Nm, Mfi = 0.7848 Nm, Mf2 = 0.233 Nm, Mf3 = i.04 Nm, Mf4 = i.36 Nm, Mf5 = 0.7848 Nm, Mw = 4i Nm, Mm = 76.9 Nm, J. = 0.0006 kgm 2, Jh = 0.00ii7 kgm2, J. = 0.000268 kgm2, 'J. = 0.00ii8 kgm2, J. = 0.00086
/H = 0.00i87 kgm 2, /ri = 0.0088 kgm 2, /r2 = 0.0064 /T3 = 0.00i6 kgm 2, /r4 = 0.00i6 kgm2,
/r6 = 0.00056 kgm2, /Ki = 0.0064 /= 0.0375 kgm 2,
/^ = 0.ii088
kgm 2, kgm 2,
/ 5 = 0.00026
5
/ 2 = 0.0073
J k2
/ , = 0.0027
J gi
kgm2, kgm2, kgm2, kgm2, kgm2,
Jg 2 = 0.0027 kgm2, Up = i.25, Ui2 = i.2, U23 = i.3, U24 = i.2.
Based on the decision of system (1) laws of change of angular speeds <j)m,<j>w and moments Mm, Mw corresponding shaft milling and wing drums (fig. 3) are received. The analysis and processing of the received laws receive graphic dependences of change of scope of fluctuations Ad) , AM , Ad) and AM . From the received depen-
Tm ' m T w w -C
dences it is visible, that with increase in resistance from processed soil considerably increases average values of scope of fluctuations AM , AM , Ad) and Ad) on nonlinear law. But, thus increase AM
m _ w 1 m 1 w ' m
and Atf)m will be considerable rather than increase AMw and Atf)w. This results from the fact that external loading directly operates on a milling drum. So, at increase in resistance of soil from 20 Nm. to 105 Nm. AM increases from 8.2 Nm. to 20.4 Nm., and AM in-
m w
creases from 4.1 Nm. to 13.1 Nm. Accordingly Atf)m increases from 1.18 1/s to 2.26 1/s, and Atj)w from 0.54 1/s to 1.38 1/s.
In fig.5. the laws ofchange^,(j)w and Mm, Mw changes ofloading from sowing seeds with the mixed loosened soil are presented. The received graphic dependences are resulted on fig. 6. The analysis of the received graphic dependences shows, that with increase in loading from sowing seeds with the crushed soil leads to reduction of angular speeds j)m and j)w on nonlinear law (curves 1, 2 see, fig. 6). Thus change j)w and Mw will be intensive, rather than changes j)m and Mm . So, at increase of the moment of resistance from sowing seeds and the crushed soil from 17 Nm. to 76 Nm. j)w decreases from 21 1/s to 10 1/s, and j)m from 31.6 1/s to 20.6 1/s. Thus the moments on shaft increase, Mw from 39 Nm. to 66 Nanometers, and Mm 61 Nm. to 82 Nm.
For maintenance of necessary non-uniformity of movement milling and winging drums and also the maximum decrease in loading on a drive unit work is recommended at Mm = 70 - 85 Nm., M = 35 - 45 Nm.
a)
b)
Fig. 3. Laws of change of angular speeds and the moments on shaft milling and winging drums:
a) - M = 95.5 Nm ; b) - M = 64.2 Nm
/ «f ' ' mr
2,0 4,0 6,0 8,0 10,0 Mni, 10 Nm
Fig. 4. Graphic changes of scope of fluctuations of angular speeds and the moments on shaft milling and winging drums from a variation of loading from processed soil: 1 - A<fm ; 2 - À<jw ; 3 - AM ; 4 - AM
M, Nnip. 1/s
120 21,0
Fig. 5. Dependences of change¡¡ ,<¡>m, Mwand Mm from variation M,
Fig. 6. Graphic dependences of change of average values of angular speeds and the moments on shaft milling and winging drums at a variation of loading from sowing seeds with the crushed soil:1 - <jm; 2 - <jw; 3 - Mm ; 4 - Mw
References:
1. Djuraev A., Turdaliyev V., MuhammedovJ. The combined unit. Patent of Republic of Uzbekistan, №FAP20150012. - 2015.
2. Djuraev A. Dynamics of working mechanisms clap of the processing cars. - Tashkent, 1987. - 168 p.
Khodjaev Abbos Agzamovich, Prof. of Building construction Department, Tashkent Architecture and building Institute, Uzbekistan
Khodjaeva Zulfiya Shuhratovna, Senior teacher of Bridges and transport tunnels Department, Tashkent automobile and Road institute, Uzbekistan E-mail: [email protected]
Experimental study of thermal strained state of reinforced concrete elements in natural conditions
Abstract: Uneven distrubution of temperature to RC-elements is cause to apperance of stress and deformations which are non-linear character. Such cyclical changing of temperature leads to appearing of micro-rifts on internal side of RC-elements.
