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How to write a graduation thesis on measurement.
Research on measurement method and measurement simulation of curved surface

Abstract 3-4

Abstract 4-5

Chapter 1 Introduction 9- 15

1. 1 Introduction 9

1.2 surface measurement method 9- 1 1

1.3 research status at home and abroad 1 1- 13

1.3. 1 Research status of surface measurement of known CAD models 1 1

1.3.2 Research Status of Surface Measurement of Unknown CAD Models 1 1- 12

1.3.3 Research Status of Measurement Simulation 12- 13

1.4 project background and main research contents 13- 15

1.4. 1 topic background 13- 14

1.4.2 The main research content of this paper is 14- 15.

Chapter 2 Research on CMM Measuring Surface Technology 15-27

2. 1 Introduction 15

2.2 CMM measurement software 15- 16

2.3 CMM measurement method of curved surface 16- 19

2.3. 1 point trigger type 16- 17

2.3.2 continuous scanning type 17- 18

2.3.3 programming mode 18- 19

2.4 curved surface measurement path planning 19-23

2.4. 1 design principle of measuring path 19-2 1

2.4.2 Path planning strategy for surface survey 2 1-23

2.5 probe radius compensation 23-25

2.6 Measurement Error Assessment 25-26

2.6. 1 measurement error evaluation under point measurement 25-26

2.6.2 Measurement error evaluation under scanning measurement 26

2.7 Overview of this chapter 26-27

Chapter III Error Analysis and Reduction Methods of CMM Measuring Surface 27-47

3. 1 Introduction 27

3.2 Influence of Machine Error on Measurement Error 27-33

Static Error 27-30

Dynamic error 30

3.2.3 Machine Error Compensation 30-33

3.3 Influence of establishing workpiece coordinate system on measurement error 33-38

3.3. 1 Error reason of establishing workpiece coordinate system 34

3.3.2 Common Methods of Establishing Workpiece Coordinate System 34-36

3.3.3 Comparison of measurement errors under different methods 36-37

3.3.4 Method of Reducing the Error of Establishing Workpiece Coordinate System 37-38

3.4 Influence of Surveying Planning on Surveying Error 38-42

3.4. 1 Plan the measurement path along the normal vector 39.

3.4.2 Finding measuring point vectors through mathematical models 39-42

3.5 Influence of probe radius compensation on measurement error 42-44

3.5. 1 probe selection 42-43

3.5.2 probe radius compensation error 43-44

3.6 Influence of operation level of surveyors on measurement error 44-46

3.6. 1 manual measurement error 44

3.6.2 Automatic measurement of three coordinates 44-46

3.7 Section 46-47 of this chapter

Chapter 4 Surface measurement and simulation of known CAD models 47-7 1

4. 1 Introduction 47

4.2 Three-plane Method and Least Square Method to Establish Workpiece Coordinate System 47-52

4.2. 1 Workpiece Coordinate System Establishment Process 47-49

4.2.2 Establishment of workpiece coordinate system in blade inspection 49-52

4.3 Adaptive Distribution of Measuring Points 52-57

4.3. 1 Determination of measuring points 52-54

4.3.2 Adaptive Distribution of Measuring Points by Curvature Difference Method 54-56

4.3.3 Self-adaptive distribution of measuring points by straight line included angle method 56-57

4.4 Path Planning and Radius Compensation along Vector Direction 57-59

4.4. 1 Planning the measurement path along the vector direction 58

4.4.2 Compensate the probe radius 58-59 along the vector direction.

4.5 Measurement Simulation 59-70

4.5. 1 simulation method research 60

4.5.2 Least Square Method to Realize the Transformation of Initial Coordinate System 60-62

4.5.3 Realization of adaptive distribution of measuring points 62-65

4.5.4 Simulation test of measuring path 65-66

4.5.5 Setting of obstacle avoidance points 66-67

4.5.6 67th-68th generation of DMIS scheme

Three coordinate measurement data reading 68-69

4.5.8 Evaluation of Measurement Error

4.6 Overview of this chapter 70-7 1