| Electrohydraulic servo/proportional amplifier is designed to provide the driving current for Electrical-mechanical converter of the Electrohydraulic servo/proportional valve and achieves the open-loop control for the electrohydraulic servo/proportional valve or the close-loop control of the valve displacement.Electrohydraulic servo/proportional amplifier directly influences the control performance of the Electrohydraulic servo/proportional valve and is very important tache to achieve Electrohydraulic control.Its research is very important.Based on research information abroad and overseas,the thesis analyzed the development,industrial application and working principle of the electrohydraulic servo/proportional amplifier.The classification and comparison of the electrohydraulic servo/proportional amplifier was also introduced.The thesis researched the advantage and disadvantage between analog servo/proportional amplifier and switch servo/proportional amplifier and designed a switch servo/proportional amplifier with the function of single power supply(+24V),PWM and dual direction driving(±2A) in view of the disadvantage of the analog servo/proportional amplifier.The thesis designed the experiment system to achieve the load current output waveform,force characteristics curve and displacement characteristics curve of the valve.The switch electrohydraulic servo/proportional amplifier is a energy-saving circuit and it reduce the hysteresis and enhance the sensitivity of the electrohydraulic servo/proportional valve.The switch electrohydraulic servo/proportional amplifier has good dual direction working characteristics.As a style of displacement sensor, Eddy Current Displacement Sensor has been widely used in many sections of national economy and social surroundings due to its advantages such as stable performance, no moving part and easy fixing. The thesis researched the structure of the Hi-pressure Vortex displacement sensor and designed the detecting circuit for the Hi-pressure Vortex displacement sensor according to the analysis of the equal electrical circuit,reactance analysis and the temperature compensation.The thesis got voltage-angle displacement curve through the detecting circuit. The test results indicate that the detecting circuit has the advantage of linearity,high resolution and credibility.In chapter 1, based on research information abroad and overseas,the thesis introduced the development,classification and comparison of the servo/proportional amplifier and the structure principle and industrial application of the Eddy Current Displacement Sensor.In chapter 2,the thesis researched the working principle of thr electrohydraulic servo/proportional valve and electrohydraulic servo/proportional amplifier and the transient performance and dynamic behaviour of the electrohydraulic servo/proportional valve.The thesis designed the electrohydraulic servo/proportional amplifier with the function of single power supply(+24V),PWM and dual direction driving(±2A) and got force characteristics curve and displacement characteristics curve through the experiment system.In chapter 3, the thesis researched the structure and principle of the Hi-pressure Vortex displacement sensor and designded the detecting circuit for the Hi-pressure Vortex displacement sensor after analyzing the equal electrical circuit,reactance analysis and the temperature compensation.and got voltage-angle displacement curve through the experiment system.The test results indicate that the detecting circuit has the advantage of linearity,high resolution and credibility.In chapter 4, all achievements of the dissertation are summarized and the further research work is put forward. |
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