The XXXVI International Scientific Symposium "Multidisciplinary Studies of the Turkish World"
The 25
th
of March 2023 ISBN: 978-605-72481-0-7 Eskishehir / Türkiye
---185---
𝒈
𝟎𝟏
= 𝑪
𝟎𝟏
∙ 𝒙
𝟐
∙ 𝒙
𝟑
(𝒙
𝟏
𝟐
− 𝒙
𝟒
𝟐
) (𝟑)
where
𝑪
𝟎𝟏
=
𝝅𝝆
𝟒
∙ 𝒂
𝟏
Figure 2. Report diagram of the plate brake
Calculated by the expression
𝑔
02
= 𝑎
2
∙ 𝑚
2
. Here
𝑎
2
- is the price of brake pads of 1 kg.
𝑚
2
- is the
mass of brake pads whether calculated as follows [2]:
𝒎
𝟐
=
𝝅𝜹
𝟏
𝝆
𝟏
𝟒
(𝑫
𝒙
𝟐
− 𝑫
𝟎
𝟐
)(𝒛 − 𝟏) (𝟒)
where
𝜌
1
is the material density of the brake pads;
𝛿
1
= 3[𝛿
1
]
is the thickness of the pulleys;
[𝛿
1
]
- is the
edibility of the bowls that can be skipped. If we write expression (4) instead of it in expression
𝑔
02
:
𝒈
𝟎𝟐
= 𝑪
𝟎𝟐
(𝒙
𝟏
𝟐
− 𝒙
𝟒
𝟐
)(𝒙
𝟑
− 𝟏) (𝟓)
we'll get it. Here
𝑪
𝟎𝟐
= 𝒂
𝟐
∙
𝝅𝝆
𝟏
𝟑[𝜹
𝟏
]
𝟒
Operating costs
(𝑔
03
)
are determined by the reliability of plates with weak brake elements. On the
other hand, the reliability of the plates largely depends
on the thermoplastic stress
𝜎
𝜑𝜑
resulting from the
heating of the plates during braking. Therefore, we express the operating costs in terms of the thermoplastic
stress of the plates:
𝒈
𝟎𝟑
= 𝒂
𝟑
∙ 𝝈
𝝋𝝋
(𝟔)
here
𝒂
𝟑
-
is the operating costs corresponding to an increase in the voltage
𝝈
𝝋𝝋
- by 1 MPa caused by the
heating of the plates. the price of
𝒂
𝟑
-
is determined by the experimental method.
In
thin plates, the thermoplastic stress can be found as follows:
𝜎
𝜑𝜑
= 𝛼𝐸(𝑡
2
− 𝑡
1
)(1 − 𝜇
2
) (7)
where,
- is the coefficient of linear expansion of the plate material;
𝐸
- is the modulus of elasticity;
- is
the Poisson's ratio [6].
∆𝑡 = (𝑡
2
− 𝑡
1
)
- let's use the heat balance equation to find.
𝑸 = 𝒌 ∙ 𝑨 (𝟖)
where
𝑄
- is the amount of heat applied to the brake pads;
𝐴
- is half of the work performed during braking:
𝑨 =
𝑻
𝑻
𝟐
∙ 𝝋 =
𝑻
𝑻
𝟐
𝝎
𝟎
∙ 𝝉
𝟎
(𝟗)
where -
𝑇
𝑇
= 𝑘
𝑇
𝑇
1
braking torque;
𝑘
𝑇
- is the reserve coefficient;
𝑇
1
- is the nominal torque on the brake shaft;
𝜔
0
-
is the initial angular velocity of the brake pads;
𝜏
0
-
is the sum of braking moments
per hour;
𝜏
0
=
;
-
is the number of brakes per hour;
-
is the braking time;
𝜑
– the amount of energy stored in the brake pads.this
is a coefficient that takes into account the quantity.