Based on the LabVIEW platform, the air compressor automatic test system Chen Jianlin (School of Mechanical and Power Engineering, Shanghai Jiaotong University, Shanghai 200240) is the guarantee of customer satisfaction and loyalty. The traditional air compressor reliability test is mainly based on manual test. It is difficult to realize the real-time recording of the sample running condition and ensure the sample test condition and design working condition due to the subjective judgment of the tester. The test result is more and more Unconvincing. In this paper, NI LabVIEW software and its hardware platform are used to design the air compressor automatic test system, which realizes the automatic measurement and control of air compressor reliability. The system realizes the reliability of the air compressor, the test conditions and the integrity of the test data, saving the manpower of the test and improving the test progress of the product.
With the continuous improvement of customer quality requirements, product reliability has become a guarantee for the competitiveness of enterprises. Therefore, reliability testing becomes a necessary process for product development and quality control. The controllability of reliability test conditions and real-time monitoring of the test process are.
The overall hardware architecture signal of the air compressor measurement and control system is converted into a measured signal conforming to the IEC standard by the acquisition and conditioning of the sensor (transmitter), and is collected and processed by the signal analog input module. 3, after being transmitted through the network communication module and the network cable The signal is transmitted to the computer and processed by the LabVIEW program. Through the setting of the operating conditions and the analysis of the test data, the LabVIEW program controls the on-off condition of the relay and the contactor through the digital output module, thereby realizing the running state of the sample. Real-time control of real-time monitoring and operating conditions.
Because the pressure sensor is far away from the data acquisition card, the current signal output of 4~20mA is selected to reduce the loss in signal transmission. At the same time, if the sensor wiring is wrong or the sensor is open, its output signal will be OmA, which will display a negative value in the software to facilitate the troubleshooting of the system. The current detection uses a voltage output signal of 0~5V. 4.2 Software Design According to the requirements of the air compressor reliability test, this paper designs the test flow as shown.
Program Flowchart LabVIEW meters use a graphical programming language. Users can call functions from the menu or icon prompts in the form of call graphs. Each function communicates via a “line†connection. Compared with the traditional programming method, LabVIEW's graphical programming method has the advantages of simple programming and easy error correction, which can save about 80% of program development time and greatly shorten the software development cycle S. "The shortest running time requires program loop. "" means the program to be used when testing the minimum run time and working pressure range for each duty cycle of the sample. The flow is as shown.
A very important research purpose of this paper is to ensure the consistency of test conditions and the accuracy of data collection. It also analyzes the collected data and controls the state of sample test through LabVIEW software, which is part of the program.
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