Synchronous data acquisition system used in wind tunnel based on stable dynamic pressure control

Abstract

The invention discloses a synchronous data acquisition system used in a wind tunnel based on stable dynamic pressure control. The data acquisition system comprises a pressure sensor, a pressure acquisition system, an aerodynamic force balance unit, an aerodynamic force acquisition system, a standard pressure source, an industrial personal computer (IPC), a stable dynamic pressure sensor, an accuracy control device, an aerodynamic parameter system and a motor fan, wherein, the pressure sensor measures the pressure in the low-speed wind tunnel and transmits the measured pressure value to the pressure acquisition system; the aerodynamic force balance unit measures aerodynamic force on an experimental model and outputs the measured aerodynamic force value to the aerodynamic force acquisition system; the standard pressure source respectively calibrates the pressure sensor, the pressure acquisition system and the stable dynamic pressure sensor so as to obtain calibration factors, the calibration factors are transmitted to the IPC so as to obtain a controlled process mathematical model for stable dynamic pressure control, and then the controlled process mathematical model is transmitted to the accuracy control device; the accuracy control device drives the pressure acquisition system, the aerodynamic parameter system and the aerodynamic force acquisition system to perform synchronousdata acquisition; the stable dynamic pressure sensor acquires variation of a flow field in the low-speed wind tunnel, and then the variation value is transmitted to the IPC; and the IPC controls the motor fan to rotate. The data acquisition system disclosed by the invention has the advantages that manpower is saved, high-accuracy data can be obtained, the operating method is simple and practical,the cost is low and the application prospect is wide.

Description

technical field [0001] The invention relates to the technical field of pressure acquisition and control, in particular to a speed-stabilized pressure synchronous control data acquisition system. Background technique [0002] In the low-speed wind tunnel, the computer sends a steady-speed voltage control command according to the test requirements, and the command is converted into an analog voltage output through the D / A board. After the interference is filtered out by a low-pass filter, it is sent to the DC speed control device to control the DC motor voltage. , so as to change the speed of the motor, drive the wind tunnel fan to rotate, and generate the flow field required for the wind tunnel test in the wind tunnel test section. For an ideal situation, when the control accuracy of the steady speed pressure reaches the highest, it is the most accurate to collect data changes. At the same time, it is necessary to collect the data of each device synchronously to truly reflect...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the deficiency that the existing technology cannot synchronously collect various equipment data when the control accuracy of the steady speed pressure reaches the highest level, the present invention provides a wind tunnel steady speed pressure synchronous control data acquisition system, which starts the standard pressure source to calibrate the steady speed pressure sensor Get the calibration coefficient of the steady-speed voltage control to the A / D converter, and the industrial control machine gets the mathematical model of the controlled process of the steady-speed voltage control to the precision control device, and the precision control device is based on the mathematical model of the controlled process

Images