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自动化专业英语考试整理版

作者:高考题库网
来源:https://www.bjmy2z.cn/gaokao
2021-01-25 03:10
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2021年1月25日发(作者:superfly)
翻译

P.1
The voltage across a pure inductor is defined by Faraday

law,which states
that the voltage across the inductor is proportional to the rate of change
with time of the current through the we have U=Ldi/dt.
纯电感电压由法拉第定律定义,
法拉第定律指出:
电感两端的电压正
比于流过电感的电 流随时间的变化率。因此可得到:
U=Ldi/dt
式中

di/dt =
电流变化率,

安培
/
秒;

L =
感应系数,

享利。

P.3
A three- phase electric circuit is energized by three alternating emfs of the
same frequency and differing in time phase by 120 electrical degrees .
三相电压的产生三相电路可由三个频率相同在时间相位上相差
120
°
电 角度的电动势供电。

P.9
One
problem
with
electronic
devices
corresponding
to
the
generalized
amplifiers is that the gains,AU or AI ,depend upon internal properties of
two-port
system(










).This
makes
design
difficult
since
these
parameters usually vary from device to device ,as well as temperature .
运算放大器像广义放大 器这样的电子器件存在的一个问题就是它们
的增益
AU

AI
取决于 双端口系统
(m

b

RI

Ro
)
的内部特性。
器件之间参数的分散性和温度漂移给设计工作增加了难度。

P.31
However, the disadvantage
is
that they generate harmonics in the utility
system
creating
a
power
quality
problem
for
other
s
thyristor
converters
constitute
a
low
lagging
power
factor
load
on
tha
utility system.
但是,
它们的缺 点是在电力系统中产生谐波,
对其他用户产生供电质
量问题。
此外,
晶闸管变 换器给电力系统提供了一个滞后的低功率因
数负载。

P.32
Inverter is a device which receives DC voltage at one side and converts it
to AC voltage on the other side
逆变器是从一侧接受直流电压,在另一侧将其转换成交流电压的装
置。
.
Inverter can be classified voltage-fed inverter and current-fed inverter.
逆变器可分成电压源型和电流源型两种。

P.36
The
permanent-magnet
motor
has several
advantages
over
convertional
types of DC advantage is reduced operational speed
characteristics of the permanent-magnet motor are similar to those of the
shunt-wound DC direction fo rotation of a permanent-magnet
moror can be reversed by reversing the twopower lines.
永磁电机相对于常规直流电机有几个优点。
优点之一是减少 了运行损
耗。
永磁电机的转速特性类似于并励式直流电机的转速特性。
永磁电
机的旋转方向可通过将电源线反接来实现

P40
A
signal
proportional
to
the
motor
speed
is
obtained
from
the
speed
sensor
.The speed
sensor
output
is
filtered
to
remove
the
AC
ripple
and
compared with the speed reference. The speed error is processed through
a
speed

output
of
the
speed
controller
UC
adjusts
the
rectifier
firing
angle
A
to
make
the
actual
speed
close
to
the
reference
speed.
正比于电机速度的信号可从速度传感器获得。
速度传感器的输出滤除< br>交流波,
并与速度参考值比较,速度误差被速度控制器处理,速度控
制器的输出
uc
调整整流器的触发角
α
,以使实际的速度接近于参考
速度。

P.45
In
a
wound-rotor
machine,the
rotor
wingding
si
similar
to
that
of
the
stator,but in a cage
machine ,the rotor has a squirrel cage-like structure
with shorted end rings.
对绕线式转子电机而言,
转子绕组与定子绕组类似,
但鼠笼式电机的
转子具有鼠笼状结构,并且有两个短路环。

With the system transfer funcion known, the Routh- Hurwitz criterion will
Tell us whether or not a system is stable .If
it is stable ,the steady-state
accuracy can be determined for various types of inputs.
如果已知系统的传递函数,劳斯
-胡尔维茨判据会告诉我们系统是否
稳定。如果系统稳定,可以确定各种类型输入时系统的稳态精度< br>
P.87
There are as many as locus branches as there open-loop poles.A branch
srtarts,for K=0,at each open-loop K is increased ,the closed-loop
pole positions trace out loci,which end,for K

at the open-loop zeros.
根轨迹的分支数等于开环极点数。当
K=0
时, 分支起始于每一个开
环极点。随着
K
值的增加,闭环极点位置绘出根轨迹,当
K
→∞时,
根轨迹终止于开环零点。

P.107
The transition from simple approximate modles,which are easy to work
with,to more realistic models produces two effects. First, a larger number
of
variables
must
be
included
in
the
model .Second
,a
more
realistic
model
is
more
likely
to
contain
nonlinearities
and
time-varying
parameters.
从易于处理的简单近似模型到 实际一些的模型的转换产生了两种作
用(存在着两个方面的问题)
。第一,大量的变量必须包含 在模型中。
第二,更实际的模型更容易包含非线性和时变参数。


P.133
The memory of a computer consists of a set of sequentially
numbered

location
is
a
register
in
which
binary
information
can
be


number

of
a
location
is
called

-


-


-


-


-


-


-


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