模型快速插入机构控制系统

Control System of Model Quick Insertion Mechanism

为避免高超声速风洞测热试验时模型在投放前被加热引起的测量误差,要求模型快速插入流场中间,研制了模型快速插入机构。该机构采用气液增速缸和伺服比例换向阀驱动,当风洞流场建立时由上驻室快速插入到试验流场中。控制系统运用计算机集中控制技术、电液伺服技术、交流伺服技术和工业现场总线技术,建立了相互独立的各个运动自由度控制回路。系统通过高速的数据采集和模拟量输出、读取CPU工作频率等方式,解决了模型快速插入和计时的难题。试验结果表明:该机构能实现模型的快速插入,动作过程响应迅速并运行平稳,达到了预期技术指标,说明该控制系统的设计是合理的。

In order to avoid the measurement error brought by heating before heat test in hypersonic wind tunnel, it＇s essential that the model should insert into the flow field quickly. Accordingly the model quick-insertion mechanism has been developed. The mechanism, which is driven by gas-liquid increase-speed cylinder and servo proportion reversing valve, can quickly release the model when the flow field is built. The control system has adopted IPC centralized-control, electro-hydraulic servo, AC servo and industrial field bus technologies, so mutual independent multiple freedom motion control circuits have been built. By high-speed data acquisition and analog output, reading CPU work frequency etc, the control system has solved the difficult question of fast insertion and timing. The test results show that the mechanism can cut in the flow field quickly during heat test and operate stably. All the technical indexes have been meet. So, the design of the control system is reasonable.