基于嵌入式技术的风洞模拟测控系统设计

Design of Wind Tunnel Simulation Measurement and Control System Based on Embedded Technology

摘要:

传统风洞模拟测控系统容易受到测试位置干扰，导致控制效果不佳，针对该问题，提出了基于嵌入式技术的风洞模拟测控系统设计。在系统硬件部分，根据IEEE1588标准，设计总线，在印刷电路板PCB上，确定布线层的层数，避免线路串扰。使用AT91 RM9200驱动模块控制开关，并在系统中嵌入测量仪器和执行机构。在系统软件流程设计过程中，通过嵌入模拟不同湍流特征脉动风场，结合PID算法，设置阈值并计算风洞模拟数据偏差值，通过调节积分控制风洞模拟测控系统的运行。由实验结果可知，该系统静风状态下，与实际情况最大误差为0.01cm；吹风状态下，与实际距离横向最大相差0.01cm，纵向相差0.01cm，具有精准控制效果。

Abstract:

The traditional wind tunnel simulation measurement and control system is susceptible to the interference of the test location, resulting in poor control effect. To solve this problem, a wind tunnel simulation measurement and control system design based on embedded technology is proposed. In the hardware part of the system, the bus is designed according to the IEEE1588 standard, and the number of wiring layers is determined on the printed circuit board PCB to avoid line crosstalk. Use AT91 RM9200 drive module to control the switch, and embed measuring instruments and actuators in the system. In the design process of the system software process, the pulsating wind field with different turbulence characteristics is embedded and simulated, combined with the PID algorithm, thresholds are set and the deviation value of the wind tunnel simulation data is calculated, and the operation of the wind tunnel simulation measurement and control system is simulated by adjusting the integral control. It can be seen from the experimental results that the system has a maximum error of 0.01cm from the actual situation in the static wind state; in the blowing state, the maximum difference between the horizontal and the actual distance is 0.01cm and the vertical difference is 0.01cm, which has a precise control effect.