Composite Switch Hydraulic Source And Its Load Automatically Adapt To The Principles Of Research

This thesis mainly deals with Compounded Switch-mode Hydraulic Power Supply and its load automatically adaptive principle. The objective of research is to solve a series of problems companied with the difference of load characteristic in Switch-mode Hydraulic Power Supply and to make more progress in the way of its practicability and industrialization. First, based upon energy-saving effect of multi-performer compounded control, thesis analyzes the advantages and disadvantages of traditional hydraulic systems and lays the emphasis on the new energy-saving hydraulic system - Switch-mode Hydraulic Power Supply, which was put forward early this century. For better solving the difference of load characteristic in Switch-mode Hydraulic Power Supply, thesis puts forward a new structure -Compounded Switch-mode Hydraulic Power Supply. After the analysis of the principle of compounded structure, much research is carried out on its optimum tracing control principle. Second, thesis lays the solid foundation in theoretical field for Compounded Switch-mode Hydraulic Power Supply, and studies characteristics of components and the whole hydraulic system. For better persuasion, in Chapter Four, thesis supplies the results of experiments and the comparison in characteristics between theory and experiments. Finally, after rigorous theoretical analysis on load automatically adaptive principle, thesis approaches the optimum tracing control principle.The first chapter is concerned with the energy-saving effect of multi-performer compounded control. Based on the analyses of advantages and disadvantages of traditional hydraulic systems, thesis puts forward the new energy-saving hydraulic system - Switch-mode Hydraulic Power Supply. After the introduction in detail about its boost structure and buck structure, general description about the background, purpose, prospective and research contents of the thesis is given.The second chapter focuses research on solving a series of problems produced by the difference of load characteristics between Switch-mode Hydraulic Power Supply and Switch-mode Electrical Power Supply. A new structure is put forward to satisfy the requirements both in boost structure and in buck structure, that is, Compounded Switch-mode Hydraulic Power Supply. In this new structure, solid theoretical supports is supplied. In the same time, thesis designs a feasible experiment system totest and verify its theoretical resultsThe third chapter builds mathematical model and analyzes the dynamic characteristics of all the hydraulic components including high-speed switch valve, high-speed check valve, hydraulic capacitance, hydraulic inductance, and hydraulic pipeline. For better explanation of their principles, this chapter analyzes specific characteristics of experiment system.The fourth chapter gives the supports with experiment for theoretical analyses of the third chapter. In this chapter, thesis mainly deals with comparison in the influences of oil pressure, flow rate, and efficiency between compounded structure and buck structure or boost structure. In addition, this chapter analyzes the reasons why the changes of oil pressure, flow rate, and efficiency in compounded structure take place.The fifth chapter puts forward the optimum control principle based upon the pervious two chapters' analyses. After analysis of open loop characteristics of Compounded Switch-mode Hydraulic Power Supply, thesis takes Integral of Time-weighted Absolute Error (for short, ITAE) as the rule for building optimum tracing controller. Through research, II mode of ITAE is chosen. With the aid of control tools of MATLA.B6.5, this chapter makes computer emulation of system. In the end, optimum controller is given.The sixth chapter gives a brief generalization about all the research work this thesis concerns with.