Study On Control And Energy Saving Characteristics Of Hydraulic Secondary Regulated Inertia Loading System

With the rapid ecomomic growth of world, energy consumption has been increased gradually, and crisis of energy became worsen and worsen. Hydraulic system has to meet not only the control performance requirement but also the effective utilization of resources. Secondary regulation system has many advantages, such as high efficiency, good controllability and recycling and reusing the braking dynamic energy and geopotential energy of the load. So it can save a lot of energy and has important engineering significance to study the control characteristic of secondary regulation system and apply it to the loading test system and the inertia load system which has big quality and start-brake frequently.According to the hydraulic inertia loading system and loading test system, the mathematical model of the system is found by mechanism modeling technology, which consists of swashplate variable cylinder, secondary element and energy recovery system. The secondary regulation comprehensive experiment system is built in the laboratory. The study on speed control, loading test and energy saving of secondary regulation inertia system are performed by simulation and experiment.Secondary regulation speed control is the most commonly used and the most basic regulation method in second regulation system, and it is the basis of other regulation methods. In this paper, the speed control of the secondary regulation system is mainly studied, using the mechanism model to found simulation model, and then checking correctness of the mathematic model and simulation by experiment。The feedforward compensation control and Fuzzy-PID control strategy are used to improve the control characteristic of speed system, and then coMPare with the traditional PID control. In order to optiming the system parameters and the system design, some main parameters are analyzed for the influence of the speed control system, such as the load inertia, external load, system damp coefficient and system pressure, etc.The counpling characteristic is one important characteristic of secondary regulation inertia loading test system, which may have bad influence on the system common operation. Through a given algorithm, and gets the decounpling operator, then apply it to the secondary regulation loading test system to anayse the decounpling control effect in time and frequency domain. The secondary regulation loading test system can realize the energy reuse, which is anayzed in this paper. The secondary regulation mult-loading system working in constant pressure network is studied by veichle bridge test system, and then gets the control characteristic and energy saving effect of the system. CAN bus is used to realize the data commiunication among the controllers and the decoupling link is used to improve the coupling influence between driving part and loading part.Against the secondary regulation inertia loading system, the simulation and experimental results of control characteristics and energy recovery efficiency have been analyzed and compared under the different load inertia, acceleration, setting speed, system pressure and initial state of accumulator. The periodic inertia loading system based on secondary regualiton is studied in the paper, the energy-saving effectiveness is anayzed under different periodic frequency and different accumulator parameters.Through the simulation and experiment research of secondary regulation system control characteristic and energy saving effectiveness, a lot of theory and experiment data are accumulated, and the simulation is proved by the experiment result, which provide the theory and technology base in the practice engneering.