问题 问答题 论述题

何为机电一体化,机电一体化产品的主要特征有哪些?

答案

参考答案:

机电一体化是传统工业被微电子技术逐步渗透过程所形成的一个新概念,它是微电子技术、机械技术相互交融的产物,是集多种技术为一体的一门新兴交叉学科。机电一体化不是机械技术与电子技术的简单叠加,而是为达到取长补短、相互补充的目的而将电子设备的信息处理功能和控制功能融合到机械装置中,使装置更具有系统性、完整性、科学性和先进性,机电一体化产品具有“技术”和“产品”的内容,是机械系统和微电子系统的有机结合,是赋予了新的功能和性能的新一代产品。

机电一体化产品是一个完整的系统,它的主要特征是:

(1)最佳化随着电子技术的发展,为实现某一功能或某一控制规律的方案大大增多了。在产品设计时,可以使机械技术和电子技术有机的结合起来,以实现系统整体的最佳化。

(2)智能化机电一体化产品可以按照预定的动作顺序或被控制的数学模型,有序地协调各相关机构的动作,达到最佳控制的目的。其控制系统大多数都具备自动控制、自动诊断、自动信息处理、自动修正检测等功能。

(3)柔性化机电一体化产品往往只需通过软件改变指令,即可达到改变传动机构的运动规律,而无需改变硬件机构。

阅读理解

The Statue of Liberty, which has been closed to the public since super storm Sandy struck in October, will reopen by July 4.

The Statue of Liberty was presented to the United States by the French people in 1886. It stands at Liberty Island as a welcome to all returning Americans.

It’s five months since the monument and Liberty Island were shut down after the storm.

While the statue itself was not seriously harmed by the storm, several buildings on the island experienced the terrible flood. The way used by ships carrying visitors from lower Manhattan and New Jersey was also destroyed.

It’s good news, it’s a little late, but at least it’s there, and now we’ll watch like an eagle to make sure this promise is kept,” Schumer told NBC New York.

In January, the government spent $59 million repairing both Liberty Island and nearby Ellis Island, which was also damaged in the storm. But the officers have not announced when Ellis Island will reopen. In November, more than a million art works had to be removed from the museum there because of the storm. The Statue of Liberty is one of the country’s most popular tourist attractions. According to the National Park Service, more than 3.7 million people visit the site every year.

小题1:Why was the Statue of Liberty closed last October?

A.Because of the super storm Sandy.

B.Because of the destroyed way.

C.Because of the damaged buildings.

D.Because of nearby Ellis Island.小题2:How long has the monument and Liberty Island been shut down?

A.One month.

B.Four months.

C.Five months.

D.Ten months.小题3:What does the underlined word It in the fifth paragraph refer to?

A.The Statue of Liberty was presented by French people.

B.The government spent $59 million repairing Liberty Island and Ellis Island.

C.The Statue of Liberty stands at Liberty Island as a welcome to all.

D.The Statue of Liberty will reopen by July 4.小题4:Which of the following is true according to this passage?

A.The Statue of Liberty was seriously harmed by the storm.

B.In January the government spent $59 million repairing Liberty Island.

C.It’s announced that Ellis Island will reopen in November.

D.The Statue of Liberty attracts over 3.7 million tourists every year.

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