为了能与主机协调工作,给纸部件每输送一张纸的时间亦应为T。这个时间包含()工作时间。
A.纸张在输纸台板上的输送时间
B.纸张在前规的定位时间
C.纸张在侧规处进行定位的时间
D.纸张分离的时间
A.纸张在输纸台板上的输送时间
B.纸张在前规的定位时间
C.纸张在侧规处进行定位的时间
D.纸张分离的时间
在张力控制系统中,采用三个滑轮和一个弹簧组成的张力测量器,用来测量纸上的张力。记弹簧力为K1y,其中y是弹簧偏离平衡位置的距离,则张力可以表示为2F= K1y,其中F为张力增量的垂直分量。此外,假设线性偏差转换器、 整流器和放大器合在一起后,可以表示为e0= -K2y ;电机的传递系数为Km,时间常数为Tm ,卷进轴的线速度在数值上是电机角速度的2倍,即v0(1)= 2ω0(t)。于是,电机运动方程为
式中,K3为张力扰动系数,ΔF为张力扰动增量。要求在所给的条件下完成:
(1)绘出张力控制系统结构图,其中应包含张力扰动ΔF (s)和卷开轴速度扰动ΔV1(s);
(2)当输入为单位阶跃扰动时,确定张力的稳态误差。
图3-11卷纸张力控制系统
【填空题】Lesson 5 听力填空-1 What is AIr Traffic Control 1. Listening to the recording and answer the following questions: (自己口头回答,不用写答案) Question One : What services does air traffic control provide? Question Two: What kinds of separation are applied by ATC? Question Three: Who has the final responsibility for flight safety? Question Four : Can the flight crew deviate from ATC instructions? 2. Listening to the recording again and fill in the blanks with words you have heard: Air traffic control is a service provided by ground-based controllers for the aircraft on the ground and in the air. It has three primary purposes: first, to separate aircraft to 1 ; second, to organize and 2 the flow of traffic; third, to 3 and other support for pilots when able. Preventing collisions is referred to as separation. Separation is a term used to prevent aircraft from coming too close to each other by use of 4 vertical and 5 separation minima. Many aircraft now have 6 systems installed to act as a backup to ATC observation and instructions. Aircraft may fly with or without the use of the air traffic control system. If with, the airspace they fly within is called " 7 "airspace, if without, then “ 8 ”airspace. ATC may 9 that pilots are required to follow, or advisories to 10 pilots operating in the airspace. In all cases, however, the pilot in command has 11 for the safety of the flight, and may 12 from ATC instructions in an emergency.
A、间歇式给纸的输送速度必然比连续式给纸的输纸速度高
B、间歇式给纸纸张不易平稳,接触前规有冲击振动
C、间歇式给纸易使定位不准,影响印刷质量
D、间歇式给纸的输送速度必然比连续式给纸的输纸速度低
A、间歇式给纸所需工作循环时间要大于连续式给纸所需要的工作循环时间
B、间歇式给纸工作循环时间长,工作效率低
C、间歇式给纸所需工作循环时间要小于连续式给纸所需要的工作循环时间
D、间歇式给纸工作循环时间长,工作效率高
A、挡纸板齐平纸堆上的纸张
B、送纸吸嘴将纸张交给送纸辊时前挡纸板完成让纸动作
C、松纸吹嘴吹风,吹松纸堆上部的十几张纸
D、分纸吸嘴的作用是吸起纸堆最上面的一张纸,并交给压纸吸嘴
图1中偏心销轴9的作用是( )。图1 SZ206型给纸机分纸吸嘴机构 1-凸轮;2-摆杆;3-导杆;4-导轨;5-活塞; 6-缸体;7-弹簧;8-分纸吸嘴;9-偏心销轴
A、调节吸嘴的高低
B、进行吸嘴的前后调节
C、上下快速提升吸嘴
D、提高结构强度
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