Design Of Data Acquisition And Analytic System For Destructive Test On Rolling Bearing Based On ZigBee

As one of the most extensive used machine replacement parts in rotary machines, the running state of rolling bearing influences the stability of the whole system directly. Manufacturers pay great attention on bearing quality inspection. Besides conventional detection of the production process, many manufacturers would take full life running tests on rolling bearings if conditions are met. The system in this paper is designed for these tests. Different from most monitoring systems that monitor the running state of rolling bearings in real time when they are being used, a design of analytic system for fatigue test on rolling bearing is proposed in this paper. The data of the whole process of the fatigue test that causes rolling bearing changes from being fully good to damaged is collected and transferred to the monitor computer, and the program on the monitor computer will analyze and store the data. These works make it possible to reappear the whole change history of data, wave and sound in the test.The data transfer work of the system design propose in this paper is based on ZigBee technology. Based on the convenient network self-startup and self-repair mechanism of ZigBee, retransmission mechanism and object dictionary are designed in software which make the wiring work and addition of new test node easy to achieve. All of these make the system more flexible. An embedded system terminal device based on ARM9 is assigned to each test stand to collect and check the data, and also control the transfer process. An LCD shows the vibrate wave and temperature in real time. When anomaly is discovered, the ARM processor will output a control signal to end the test process. Terminal devices upload the vibrating and temperature data of their test stand to the center monitor PC. The program on the center monitor PC figures out the wave based on the received data and its FFT wave also, then these data is stored in files on the hard disk. If needed, control signals are emitted to terminal devices through ZigBee network to control the test process. The network is started in mesh topology, and an upper protocol include auto resend mechanism is designed to ensure stability of wireless network transfer.The preliminary test reveals that the system runs steadily. Under the work of ZigBee's protocol stack and the retransmission mechanism, the wireless network dose a good job on transfer constantly, which provides condition for the communication between the center monitor PC and terminal device. The PC program provides a friendly interface, so it is very convenient to look over data and send control signals to the terminal devices. Data in different periods of the test is stored and can be analyzed, which provides data support to the research on bearing's failure process and maybe deeper theory research.