Proposition and verification of an energy saving secondary control swing for hydraulic excavator

다국어 초록 (Multilingual Abstract)

Energy efficiency has become a major research issue in all fields of engineering. Consuming rate of energy and pollution is more and more serious nowadays, so research on energy saving of hydraulic excavators has great interpretation because of their large application quantities, high energy consumption and bad exhaust. The rotating movement of excavator is called swing or slew and is driven hydraulically. In the swing braking time the remaining fluid will save as energy by a simple accumulator. This remaining save energy will use in the system from accumulator. Proposed swing system have some dissimilarities from the conventional swing system. The proposed system is considered as secondary by using two combination of transformer (motor & pump combination). The effect of accumulator capacity in the save energy is basically discussed. With different motor and pump parameter, comparison result of the proposed Secondary swing system and conventional system is also discussed. Furthermore, simulates variable inertia and show the effect of variable moment of inertia in different simulation result .Different simulation result with different parameter will show the change of proposed secondary swing systems different criteria. The proposed system will be developed in AMESim software. Depends on some specific parts parameter variation, the proposed system will be more efficient in saving energy.

목차 (Table of Contents)

• Table of Contents
• Abstract i
• Acknowledgements ii
• Table of Contents iii
• List of Figures vi
• LIST OF TABLES viii
• Chapter 1 1
• INTRODUCTION 1
• 1.1 Overview 1
• 1.2 Research objective 3
• 1.3 Thesis outline 3
• Chapter 2 5
• CONVENTIONAL SWING SYSTEM FOR HYDRAULIC EXCAVATOR 5
• 2.1 Background of a hydraulic system 5
• 2.2 Features of Hydraulic excavator 6
• 2.2.1 The Arm 6
• 2.2.2 The Engine 7
• 2.2.3 The Swing 7
• 2.2.4 The Cab 7
• 2.2.5 The Feet 7
• 2.3 Types of Hydraulic excavator 8
• 2.3.1 Loader backhoe 8
• 2.3.2 Bucket wheel excavator 8
• 2.3.3 Midi Excavator 9
• 2.3.4 Mini Excavator 10
• 2.3.5 Other types of excavators include: 11
• 2.4 Basic principle of conventional swing system 11
• 2.5 Basic principle of proposed conventional swing system 12
• 2.6 AMESim structure of proposed conventional swing system 15
• Chapter 3 16
• SECONDARY CONTROLLED SWING FOR HYDRAULIC EXCAVATOR 16
• 3.1 Back ground of Swing system for hydraulic excavator 16
• 3.2 Overview of Secondary controlled Swing system for hydraulic excavator 17
• 3.3 Structure of the Proposed Secondary Swing System 19
• 3.3.1 Electric motor 19
• 3.3.2 Hydraulic pump 19
• 3.3.3 Flow valve 1 20
• 3.3.4 Hydraulic motor 20
• 3.3.5 Swing Drive 21
• 3.3.6 Flow valve 2 21
• 3.3.7 Save energy circuit 21
• 3.3.8 Reuse energy circuit 21
• 3.4 Step size, duration and position 22
• 3.5 Advantages of proposed system 23
• 3.6 Disadvantages of proposed system 23
• 3.7 AMESim structure of proposed Secondary controlled swing for hydraulic excavator 23
• 3.8 Control Strategy 24
• Chapter 4 27
• SIMULATION RESULTS AND DISCUSSIONS 27
• 4.1 Parameter analysis 27
• 4.1.1 Effect of moment of inertia 27
• 4.2 Comparison Result Analysis 33
• 4.2.1 Comparison Result Analysis Section One 33
• 4.2.2 Comparison Result Analysis Section Two 38
• 4.2.3 Comparison Result Analysis Section Three 42
• 4.2.4 Accumulator Saving Energy Result Analysis 45
• Chapter 5 50
• CONCLUSIONS AND FUTURE WORKS 50
• 5.1 Conclusions 50
• 5.2 Future works 51
• REFERENCES 52