中国大学Precision Machine Design章节答案(慕课2023完整答案)

中国大学Precision Machine Design章节答案(慕课2023完整答案)

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Lesson TWO

Assignment #1

1、中国章节Calculate the degrees of freedom of the following illustrated mechanism. Point out the compound hinges,大学答案答案 partial degrees of freedom and virtual constraints in the movement diagram of the mechanism. Blocking mechanism of slag mouth of open hearth furnace

2、Calculate the degrees of freedom of the following illustrated mechanism. Point out the compound hinges,慕课 partial degrees of freedom and virtual constraints in the movement diagram of the mechanism. Dosing mechanism of dosing pump

3、Calculate the degrees of freedom of the following illustrated mechanism. Point out the compound hinges,完整 partial degrees of freedom and virtual constraints in the movement diagram of the mechanism. Measuring instrument mechanism

4、Calculate the degrees of freedom of the following illustrated mechanism. Point out the compound hinges,中国章节 partial degrees of freedom and virtual constraints in the movement diagram of the mechanism. Sawmill mechanism

5、Calculate the degrees of freedom of the following illustrated mechanism. Point out the compound hinges,大学答案答案 partial degrees of freedom and virtual constraints in the movement diagram of the mechanism. Feeding mechanism of sewing machine

6、Calculate the degrees of freedom of the following illustrated mechanism. Point out the compound hinges,慕课 partial degrees of freedom and virtual constraints in the movement diagram of the mechanism. Stamping mechanism

7、Draw a schematic diagram of the mechanism movement of the illustrated mechanism. (a) Pump mechanism (b) Rotary plunger pump mechanism

8、完整Among the four-bar mechanisms,中国章节 what are the mechanisms that may have dead points? What are the conditions for generating the dead points position? Give examples of the harm of dead points and their application in mechanical engineering.

9、According to the dimensions indicated in the figure below,大学答案答案 determine the type of each four-bar mechanism.

10、In the illustrated hinge four-bar mechanism,慕课 BC = 50 mm, CD = 35 mm, AD = 30 mm, AD is the frame. Question1: If this mechanism is a crank and rocker mechanism, and AB is a crank, find the maximum value of AB. Question2: If this mechanism is a double crank mechanism, find the range of AB. Question3: If the mechanism is a double rocker mechanism, find the range of AB.

11、What are the main types of cam and follower?完整 What are the advantages and disadvantages of each of them?

12、What are the commonly used follower movement laws?中国章节 What are their characteristics? How to draw their displacement line diagram?

Lesson FIVE

Assignment #2

1、Try to compare the base circle and the root circle of the normal toothed involute standard straight tooth cylindrical gear. Under what conditions is 大学答案答案the base circle larger than the root circle? Under what conditions is the base circle smaller than the root circle?

2、Try to describe the correct engaging conditions of a pair of straight spur gears,慕课 a pair of helical spur gears, a pair of spur bevel gears, and a worm gear.

3、It is known that some parameters of a normal straight standard spur gear are α=20°, m = 10 mm, z = 40, try to find the curvature of the involute tooth profile on the reference circle, base circle, and tooth tip circle, respectively radius and pressure angle.

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9、Try to explain the causes of several main failure modes of gears. What are the main failure modes of closed soft tooth surface, closed hard tooth surface and open gear transmission? What are their design criteria?

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中国大学Precision Machine Design

大学教育一直是中国社会关注的焦点。随着社会经济的发展，大学教育在中国越来越受到重视。其中，Precision Machine Design是大学教育中的重要学科之一。

Precision Machine Design是机械工程学科中的一个重要分支，它主要研究精密机械和精密机器的设计、制造和应用。精密机械是指精度高、稳定性好、工作可靠的机械系统。精密机器则是由一系列精密机械组成的机械系统。

Precision Machine Design在以下领域应用广泛：

• 航空航天
• 国防
• 汽车制造
• 电子制造
• 仪器仪表
• 生物医学

中国大学Precision Machine Design主要涵盖以下内容：

• 精密机械设计
• 精密机械制造技术
• 精密控制技术
• 精密测量技术
• 精密加工技术
• CAD/CAM
• 机器人技术

中国大学Precision Machine Design的教学重点：

• 掌握精密机械设计原理和方法，能够设计出高精度、高稳定性的机械系统。
• 掌握精密机械制造技术，能够制造出高精度、高稳定性的机械系统。
• 掌握精密控制技术，能够实现对机械系统的高精度控制。
• 掌握精密测量技术，能够对机械系统进行高精度的测量。
• 掌握精密加工技术，能够对机械零部件进行高精度的加工。
• 掌握CAD/CAM技术，能够进行机械设计和加工的虚拟仿真。
• 掌握机器人技术，能够应用机器人技术进行机械系统的自动化控制。

中国大学Precision Machine Design的教学方法和手段：

• 实验教学
• 课程设计
• 实习教学
• 毕业设计

中国大学Precision Machine Design的毕业就业前景：

随着社会经济的发展，Precision Machine Design的应用领域越来越广泛，对人才的需求也越来越大。精密机械和精密机器的制造和应用需要大量的高素质人才。因此，中国大学Precision Machine Design的毕业生就业前景是非常广阔的，可以在以下领域得到广泛应用：

• 航空航天
• 国防
• 汽车制造
• 电子制造
• 仪器仪表
• 生物医学

总之，Precision Machine Design是一个非常重要的学科，它在现代工业中的应用越来越广泛，对于大学生而言，学好这门课程将有助于其未来的职业发展。