To study the deformation behavior of aircraft skin parts during the process of stretch-forming, numerical control testing system was established on the basis of universal three-axes loading machine by analyzing the characteristicof skin stretch-forming technique. Velocity control of hydraulic cylinders and displacement synchronous control of same axial hydraulic cylinders were realized by introducing the improved digital proportional, differential, intergral (PID) control algorithm and the system is competent for most of stretch-forming test. Testing result shows that the control precision of testing system is well and the performance is reliable, it provides the experimental basis for the further research.
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