Flow signal measurement flow measurement using the German E+H 72F80 vortex flowmeter, the accuracy of 025%. Vortex flowmeter is a fluid oscillation flow meter, the use of modern electronic detection technology to detect the frequency of vortex; The signal is amplified, shaped, and converted into a standard electrical signal output. Operating temperature range 73673K, anti-temperature shock greater than 150K/s, anti-vibration in each axial direction exceeds 1g. The measured temperature parameters of the temperature signal include the compressor inlet/outlet temperature, lubricant inlet/outlet temperature and combustion chamber directly involved in compressor performance calculation. Post temperature and other temperature signals. The inlet and outlet temperatures of the compressor with a lower temperature measurement range are Pt100 type platinum resistors, while the turbine inlet and outlet temperatures with a higher temperature range use K type thermocouples. After the same temperature signal is compensated by the compensation wire, it is connected to the secondary display instrument all the way. All the way through the temperature transmitter is connected to the data acquisition card and converted into a digital signal.
The measured pressure parameters of the pressure signal mainly include parameters such as inlet and outlet pressures of the compressor that directly participate in the calculation of the performance of the compressor, oil inlet pressure, and fuel pressure. The pressure measurement involved in the operation requires high precision, and the signal transmission distance is long. A high-precision pressure transmitter is used, and the output signals are all 420 mA current signals. The same pressure signal is input to the secondary display instrument and the data acquisition card at the same time so as to compare the measurement results and ensure the measurement accuracy.
The Hardware of the Measurement and Control System The system hardware includes the hardware structure for measuring and controlling two parts. In order to ensure the reliability and measurement accuracy of the test system, the test rig adopts 2 sets of measurement systems, and a computer acquisition system is added to the original secondary display instrument. On the one hand, the measurement results of the two measurement systems can be compared at any time. Whether it is the same, to ensure measurement accuracy; the other part of the measurement mainly include speed sensor, pressure transmitter, thermocouple, temperature transmitter and the corresponding secondary display instrument, data acquisition card and industrial computer.
The control part also adopts two kinds of control methods. On the basis of retaining the original manual control, an automatic control system is added. The automatic control system adopts a distributed control method. The OMRON C200HEPLC is used as the lower computer of the system. It is responsible for completing the automatic control of the process flow of each test item on the site. The switch quantity and analog quantity of each control pump and valve are set according to the program. The industrial computer as the host computer completes the monitoring and data collection of the lower computer.
Test data management and characteristic curve drawing module test data management and characteristic curve drawing module, test data collected by configuration software through DDE data exchange, test data stored in pre-designed Access database, through database ADO access technology, use VB manages the database, queries database records through SQL, and pre-designs form template reports to the printer to output test results. The database management interface is as shown. The automatic drawing of the compressor characteristic curve is a difficult point in the performance test of the compressor. The system uses Matlab software for programming and establishes a visual drawing interface. According to the experimental test results, the performance efficiency curve of the compressor is automatically drawn.
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