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吉林大学机械学院本科毕业设计外文翻译格式.docx
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本科生毕业设计(论文)
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中文题目: 配合新一代液力变矩器的柴油
动力线的一些特性
英文题目:some properties of a diesel driveline
with hydrodynamic torque converters of the
lastest generation
学生姓名:
学 号:
班 级:
专 业:机械工程及自动化
指导教师:
Some properties of a diesel drive line with
hydrodynamic torque converters of the latest
generation
Abstract
Dynamic properties of a drive line with a controlled Diesel engine, hydrodynamic
transmission mechanism, additional gearing and a loading-working machine
producing common monoharmonic loading are investigated. Solution of the
dynamic problem is based on phenomenological experimental data: driving
torque-speed characteristic in the part of the prime mover and so-called external
static characteristic in the hydrotransmission part. The non-linear task is solved by a
modified harmonic balance method that was described in preceding publications by
the author.
Keywords: Machine drive line; Controlled Diesel drive; Hydrodynamic torque
converter; Working machine; Periodic loading; Stationary dynamic state
Nomenclature and abbreviations
a, b --- ------Coulomb and viscous non-dimensional friction losses
A
i
, B
i
--- ----coefficients in mathematical expression of torque-speed characteristic
i, i
m
----------kinematic transmission, supplementary gearing transmission ratio
I , I
z
-------mean reduced moment of inertia in driving and loading part
k
λ
, k
K
---------tangent slopes of λ(i ) and K(i ) curves respectively
K -------------moment transmission
M ------------Diesel-engine moment
M
D
(ω, z) ----controlled torque-speed driving characteristic
M
Dmax
(ω), M
Dmin
(ω) ---torque-speed characteristic for maximal and minimal fuel
supply
M
1
, ( ), M
2
, ( ) ---pump loading moment and turbine driving moment
M
T1
, M
T2
----friction loss moment in driving and loading part
M
z
, M
za
----mean value and amplitude of loading moment
-------------hydrodynamic converter characteristic radius
t -------------time
T, T
D------------
Watt regulator and Diesel-engine time constant
u, z ---------gas lever and regulator displacement
w -----------common dynamic variable
ε -----------regulator structural parameter
ζ -----------regulator damping ratio
λ -----------coefficient of rotation moment
ν -----------loading angular velocity
, π-------index denoting mean value and periodical component
---------hydraulic medium density
----------rotation angle
ω
1
, ( ), ω
2
---pump and turbine angular velocity
DM ------Diesel-engine
G, G
D
---additional and Watt-regulator gearing
HdPT ---hydrodynamic power transmission
IJ --------Injector
LM ------loading mechanism (working machine)
P, R, T---pump, reactor, turbine
Article Outline
Nomenclature
1. Introduction
2. Mathematical model of the system
3. Stationary dynamic solution at monoharmonic loading
4. Results evaluation and concluding remarks
1. Introduction
Dynamic properties of a drive line (actuating unit) consisting of a controlled
Diesel engine (DM), hydrodynamic power transmission system (HdPT), additional
gearing (G) and a loading mechanism (LM) or working machine are investigated.
The working machine loads the prime mover and the transmissions with a prescribed
moment. A simple idealised schematic layout of the complete system is given in Fig.
1. The considered Diesel engine is a standard production: ZETOR 8002.1 controlled
by a mechanical (Watt’s) or electronic regulator R
D
governing fuel injector IJ. In the
place of the hydrodynamic power transmission there are gradually applied
hydrodynamic torque converters of the latest generation that have been projected
and tested in WUSAM (Research and Projecting Institute of Machines and
Mechanisms), j.s.c. Zvolen, Slovakia. These converters represent a three component
assembly composed of a rotational pump (P), turbine (T) and a reactor (R) that may
revolve in one direction as a free wheel. Advantage of these converters is the fact
that their external dimensions and the dimensions of their individual components are
identical and they may be mutually changed and arbitrarily combined in order to
reach demanded properties. They differ only by internal configuration and blade
geometry. According to [1] up to now more than 70 various types have been
experimentally tested and from them the ones have been chosen that optimally
fulfilled required properties. The mechanical system under consideration represents
a sophisticated energy transfer chain from a source––prime mover to working
mechanism. Because every real drive is of finite power, any periodic loading always
evokes vibrations of all the dynamic variables even though we suppose all the
connecting shafts and gearings rigid and backlash free. The influence of dynamic
loading on the prime mover may be just controlled by a suitable choice of the torque
converter.
Fig. 1. Schematic layout of the Diesel drive line.
In the paper influence of constant and periodic loading on time course of all the
dynamic variables of the system (and particularly on the variables of the prime
mover) is investigated at application of some selected types of hydrodynamic torque
converters of the latest generation. For fulfilling this task it is necessary to create a
suitable mathematical model of the whole combined system and then find its
stationary solution corresponding to a required loading.
2. Mathematical model of the system
At the beginning it is necessary to emphasize that mathematical modelling of the
drive line in question is based, in our approach, on knowledge of the published
phenomenological data: stationary torque-speed characteristic of the prime mover
and so-called external static characteristic of the applied hydrodynamic torque
converter. It is a much simpler process than modelling based on thermodynamic
equations of burning fuel mixture in the Diesel engine and on hydrodynamic
equations of real streaming working medium in very complicated cavities of the
torque converter. The characteristics are usually given by manufacturer of the
individual system components. This is different and simpler approach to solution of
the problem than one may find e.g. at Ishihara [2], Hrovat and Tobler [3], Kesy and
Kesy [4], Laptev [5] and some others. The derived dimensional and non-dimensional
mathematical models of the mechanical system are introduced in [6]. The
non-dimensional, reduced, so-called single-shaft model (in the driving and loading
part), was derived in the form of combined system of the following differential and
algebraic equations:
(1)
(2)
(3)
(4)
M
2
=KM
1
,
(5)
λ=λ(i),
(6)
K=K(i),
(7)
(8)
(9)
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