MODERN EDUCATION AND DEVELOPMENT
Выпуск журнала №-26
Часть–5_ Май –2025
151
THEORY OF FORCES DYNAMICLY INFLUENCED ON QUARRY
TRUCKS
Sardor Husniddinovich Abdullayev, Adkhamjon Ismatov, Raxmonov Izzat
and Jurakulov Ogabek
Navoi State University of Mining and Technologies, Navoi, Uzbekistan
E-mail: sardor.abdullayev7000@gmail.com
Annotation.
The article presents a mathematical development that allows
determining the optimal ratio of construction and operational parameters of dump
trucks, ensuring the stability of its movement when passing through uneven, deep areas
of highways. The theory and results of experimental studies on the damage of truck
transmissions as a result of the influence of road defects on the movement of a dump
truck on unsuitable quarry roads are presented.
Keywords.
Quarry dump trucks, mathematical development, Generalized
coordinate, dynamic forces, mechanism cylinders, brackets are welded to the ends of
the third transverse metal.
Introduction
Quarry dump trucks are used to transport useful rock or loose rock to the dump
or receiving bunkers. When a dump truck transports rock, the loaded rock creates
significant dynamic stress on the supporting structures, even when at rest. Over
200.000 dynamic forces are applied to the support structure of the new dump trucks in
the quarry and about 50.000 dynamic forces during unloading.
MODERN EDUCATION AND DEVELOPMENT
Выпуск журнала №-26
Часть–5_ Май –2025
152
FIGURE 1.
Generalized coordinate calculation scheme
The sleepers have a box-shaped section of variable height along the length of
the frame. The first transverse metal 1 is made of a pipe with a diameter of 245x45 mm
and is attached to the central joint of the front axle using a stud. The second transverse
metal 2 is attached to the front suspension frame by means of brackets from the lower
transverse metal connecting the side parts of the frame. The front suspension cross
member is attached to the lower cross member. The third transverse metal is welded to
the 3 side spears, which strengthens the middle part of the frame. The central arm of
the rear bridge is attached to the third cross metal. Lower supports of tilt mechanism
cylinders, brackets are welded to the ends of the third transverse metal. It consists of
two cast pipe supports with a diameter of 325x36 mm. Pipes and cross elements are
made of 10HSND GOST19281-89 alloy steel. The frame made of 10XSND alloy steel
has the following mechanical properties: tensile strength sV= 540 MPa, yield strength
sT= 400 MPa, impact strength aN=30 N.m/sm
2
at minus 70 oS. The platform is made
of high-quality, corrosion-resistant alloy steel 18XGNMFR, its mechanical properties
are as follows: tensile strength sV= 1100 MPa, yield strength sT= 1000 MPa, impact
force at minus 40
o
S is equal to aN=30 N.m/sm
2
.
The differential equations and the formation of oscillations around the
horizontal axis passing through the center of mass of the truck, that is, the frame, are
presented in the form of a generalized coordinate calculation scheme in
Fig. 1.
Since
the truck is oscillating in its vertical longitudinal plane, the system has two degrees of
freedom. For generalized coordinates, the vertical displacement
Z
of the center of mass
of the dump truck
0
and its angle of rotation n are taken around the axis parallel to the
axes of the truck. As a result of moving the loads in the div to a certain distance from
the center during the movement of the truck, the front and rear wheels vibrate relative
to the center. Since this oscillating process is complex, the solution was analyzed using
the Lagrange function.
0
q
L
q
L
dt
d
(1)
here;
L
-
the Lagrangian function,
p
k
E
E
L
k
E
,
p
E
-
kinetic and potential energy of the car
MODERN EDUCATION AND DEVELOPMENT
Выпуск журнала №-26
Часть–5_ Май –2025
153
(Joule),
q
- generalized coordinate system, after loading the car div, the following
kinetic energies are generated.
2
2
2
2
2
2
2
2
x
g
Q
j
m
E
k
(2)
Potential energies;
2
1
p
p
p
E
E
E
,
1
p
E
- potential energy of truck gravity
(Joule),
2
p
E
- potential energy of truck suspension (Joule).
Qx
E
p
1
(3)
2
0
1
21
2
l
x
x
k
E
p
2
0
2
22
2
l
x
x
k
E
p
(4)
Due to the loading mass of dump trucks in the normal state, the amplitude
fluctuations caused by the inertia force and traction forces during the movement
increased by 36% of the nominal force at the higher frequency and decreased by 24%
at the lower frequency, the difference of the upper and lower frequencies of the total
amplitude was 60%.
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