Research on Multi-hydraulic Axis High-Precision Control Method of A Wind Tunnel Nozzle
In order to realize the high-level motion control of a wind tunnel nozzle,it is necessary to carry out high-precision con-trol of a single hydraulic axis driving the nozzle forming,the synchronous control of two hydraulic axes at the same support point,the symmetrical motion control of the oil cylinder at the upper and lower symmetrical support points,and the coordinated linkage control of 40 hydraulic axes.On the basis of theoretical derivation of the single hydraulic axis position closed-loop control transfer function,speed feed forward,integral effect dynamic cut out,average synchronization,axis coordination insertion strategy,etc.were used.The control strategy and implementation method of the multi-hydraulic axis synchronous collaborative servo system were studied,the control system hardware and software were constructed and verified by experiments.The results show that the synchronization accuracy of the two cylin-ders at the single support point can reach±0.009 mm,and the cooperative positioning accuracy of multiple cylinders can reach±0.015 mm,which effectively ensures the accurate operation and positioning of the nozzle and lays foundation for obtaining high-quality flow field test data.
wind tunnel nozzlemulti-hydraulic axishigh-precision control
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