Acquisition system and acquisition method for wind tunnel continuous variable-angle movement force measurement data

The invention discloses an acquisition system and acquisition method for wind tunnel continuous variable-angle movement force measurement test data. The system comprises an upper computer, a control card, a driver, a servomotor, a PLC (programmable logic controller) counter and a VXI data acquisition system, wherein the upper computer is used for computing the controlled pulse amount by a master control program and transmitting the pulse amount to the control card; the control card outputs a corresponding pulse to the driver; the driver decodes the pulse into an alternating signal and transmits the alternating signal to the servomotor, so as to realize control of the servomotor; and at the same time, the signal fed back from the servomotor is returned to the driver, a path of feedback signal is separated and transmitted to the PLC counter, and the PLC counter begins counting from a set point and outputs the pulse at an equal interval to trigger the VXI data acquisition system, so that the scale signal of a model in a wind tunnel, the wind tunnel/indoor temperature signal and the atmospheric pressure signal are acquired and the acquisition results are saved to the VXI data acquisition system. According to the invention, error and other mistakes caused by computing are reduced and the pneumatic analysis integrality and accuracy are improved.