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带纯滞后一阶惯性对象系统振铃问题分析 被引量:3
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作者 郭广颂 靳占行 董淑晴 《南方农机》 2019年第23期15-16,20,共3页
现有“计算机控制”课程教材对于带有纯滞后一阶惯性对象系统的大林算法振铃现象存在“有条件存在振铃”和“不存在振铃”2种差异较大的结论。本文从被控对象脉冲传递函数极零点成因及其与控制量暂态响应的关系两个方面分析,得出在滞后... 现有“计算机控制”课程教材对于带有纯滞后一阶惯性对象系统的大林算法振铃现象存在“有条件存在振铃”和“不存在振铃”2种差异较大的结论。本文从被控对象脉冲传递函数极零点成因及其与控制量暂态响应的关系两个方面分析,得出在滞后时间是采样时间整数倍情况下,该对象系统不存在振铃现象的结论。为了减小控制量输出变化幅度,更安全的方法是消除所有可能的振铃因子。 展开更多
关键词 一阶系统 纯滞后 大林 振铃
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Hong Kong
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作者 董淑晴 王桂馨 《中学生英语》 2017年第3期12-12,共1页
Hong Kong is called the Oriental Pearl by many people.It lies in the south of China.It is about 1,070 square kilometers in size,with over 7 million people living there.The currency in Hong Kong is Hong Kong Dollars,an... Hong Kong is called the Oriental Pearl by many people.It lies in the south of China.It is about 1,070 square kilometers in size,with over 7 million people living there.The currency in Hong Kong is Hong Kong Dollars,and RMB yuan is also widely used there.Its official languages are Chinese and English. 展开更多
关键词 中学 英语 课外阅读 阅读材料
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A Meaningful Experience
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作者 董淑晴 《中学生英语》 2017年第15期7-7,共1页
On March 12,our class had a meaningful experience.In the morning,we bicycled to the suburbs to plant trees,talking and laughing all the way.We began to work as soon as we arrived.Some of us dug holes.Some carried and ... On March 12,our class had a meaningful experience.In the morning,we bicycled to the suburbs to plant trees,talking and laughing all the way.We began to work as soon as we arrived.Some of us dug holes.Some carried and planted young trees.Others watered them.After getting the work done,we put up a board reminding people to protect the trees. 展开更多
关键词 中等教育 英语 阅读 理解
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A Survey on Children’s TV Viewing Habit
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作者 董淑晴 王桂馨 《中学生英语》 2017年第35期7-7,共1页
We made a survey on children’s TV viewing habit last week.The result shows that 70%of the students watch TV for more than three hours every week.And 10%of the students watch TV for less than two hours every week.80%o... We made a survey on children’s TV viewing habit last week.The result shows that 70%of the students watch TV for more than three hours every week.And 10%of the students watch TV for less than two hours every week.80%of the students watch TV at weekends only and 20%of the students watch TV every day. 展开更多
关键词 中学 英语作文 课外阅读 阅读材料
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Computers in My Life
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作者 董淑晴 王桂馨 《中学生英语》 2017年第23期7-7,共1页
The computer has become an important part of my life.It has a great influence on me.Usually I use the computer to search for information and other things.With the help of the computer,I can get more knowledge.In my fr... The computer has become an important part of my life.It has a great influence on me.Usually I use the computer to search for information and other things.With the help of the computer,I can get more knowledge.In my free time,I not only communicate with my teachers and classmates by email,but also discuss the problems with them online. 展开更多
关键词 中学 英语作文 课外阅读 阅读材料
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I Like Going to School by Bike
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作者 董淑晴 王桂馨 《中学生英语》 2017年第47期7-7,共1页
I think going to school by bike is good for us.First of all,riding to school is a wonderful way to exercise and it’s good for our health.Next,it’s fun to ride together with friends every day.What’s more,if we ride ... I think going to school by bike is good for us.First of all,riding to school is a wonderful way to exercise and it’s good for our health.Next,it’s fun to ride together with friends every day.What’s more,if we ride bikes,our parents won’t have to drive us to school.There will be fewer cars in the city.Less driving helps to make our city cleaner.I hope more and more students will go to school on foot. 展开更多
关键词 中学 英语 课外阅读 阅读材料
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Differences Btween Englih Students and Chinese Students
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作者 董淑晴 王桂馨 《中学生英语》 2016年第23期7-7,共1页
Hello,everyone!I’m glad to be here to talk about some differences between English students and Chinese students.In England,students go to school by bike or on school buses.After school,they usually clean up the garde... Hello,everyone!I’m glad to be here to talk about some differences between English students and Chinese students.In England,students go to school by bike or on school buses.After school,they usually clean up the gardens and look after the pets.What’s more,they have to make pocket money by working in their spare time.But 展开更多
关键词 中等教育 英语 阅读 理解
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My Life in Ten Years
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作者 董淑晴 《疯狂英语(初中天地)》 2017年第6期56-56,共1页
Have you thought about your life in ten years? What will it be like? I think I will be an artist in ten years, because I love painting very much. I will be famous and rich. I will sell my paintings and make good use o... Have you thought about your life in ten years? What will it be like? I think I will be an artist in ten years, because I love painting very much. I will be famous and rich. I will sell my paintings and make good use of the money to build a big house for poor families and the children without parents. I will give the money to people who need help. I will try my best to help people all over the world. 展开更多
关键词 PAINTINGS PEOPLE
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提高石榴品质的主要技术措施
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作者 李宗圈 付铭锋 +1 位作者 董淑晴 张巧珍 《果农之友》 2006年第10期23-23,共1页
关键词 品质 石榴 技术 商品价值 经营效益 消费者 经营者
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