Development and Application of Safety Interlock and Status Monitoring System for Jet Wind Tunnel Based on Field Bus and Real-time Network
Jet wind tunnel system has the characteristics of complex architecture,multiple control objects and hydraulic mecha-nisms,flexible adjustment of model support mechanisms,and continuous adjustable Mach numbers,a special safety interlock and sta-tus monitoring system is developed.The system fully utilizes advanced field bus and real-time network technologies such as Profinet,builds a hardware platform based on Siemens S7-1500 series PLC as the core controller,and independently develops a real-time moni-toring software system.It solves technical problems such as fast data exchange between multi-layer or multi-source control subsys-tems,simulation operation strategy before testing,and establishes reliable safety interlocking logic and three-level shutdown mecha-nism.The static and dynamic testing results of the system show that it is suitable for wind tunnel tests with a range of 0.3～3.5 Ma,the opening and closing time of the fast valve is better than 10 s,that of the pressure regulating valve is better than 2 s,the pressure monitoring accuracy is better than 0.1％,the valve opening monitoring accuracy is better than 0.1 mm,the monitoring and control adjustment cycle is better than 100 ms,the system operates stably and smoothly,and the data are real-time and accurate,providing necessary software and hardware guarantees for the safety of wind tunnel personnel and equipment.
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