Study Of Control Strategy And Design Of Swing Motor For Hydraulic Angle-vibration Table

With the development of engineering technology, the requirements of performancealso become higher relatively in some cutting-edge domains, such as astronautics andaerospace engineering, shipbuilding and nuclear industry, so that vibration environmentsimulation and related equipment get more and more widely concerned. With strongtorque transmission, high automaticity, great control precision and other advantages,electrical-hydraulic angle-vibration table occupies irreplaceable position in large-scaletrial target vibration test, mainly focus on components of aerocraft and sensor. Therefore,developing an angular vibration table with single axis based on swing hydraulic motorhas a far-reaching influence on improvement of industry and national defense of ourcountry.Novel structure model of4-vane swing hydraulic motor, which specifically appliedon angular vibration table, is proposed in our study. Using analogous hydrostaticbearing technique and clearance seal format, the motor will be able to solve short lifeproblem under high frequency vibration condition. By analyzing analogous hydrostaticbearing stiffness and leakage character, we proved that this motor has high bandwidth,low friction, long life, powerful output capability, which further testifies that this motorhas an excellent performance on the condition of hydraulic angular vibration table.The nature of vibration is the realization of acceleration signal control based onposition servo control. For improving performance of position servo control system, weutilize three variable controller to increase damping ratio and bandwidth, applySimulink on validation of control algorithms and make a huge progress on systemperformance with the proper parameters. We also adopt tracking-differentiator to solvenoise pollution problem from angular position and obtain more accurate angularacceleration signal as a prerequisite for control. On the basis of position close loopcontrol, we use iterative learning control to achieve acceleration control of vibration, byiteratively adjusting input signal to make output signal repeat target signal well,successfully avoiding amplitude attenuation and phase lag phenomena.Eventually, we use system identification to get the accurate parameters of system,configurate three variable controller for position close loop control with the parametersabove and add iterative learning algorithms to realize acceleration control of signal ofsystem. The control software is developed by C++Builder to complete sinusoidal trial.The result shows that three variable controller and iterative learning algorithms have anexcellent contribution on vibration control of angular vibration table.