Research On Non-contact Real-time Multi-channel Monitoring And Control System For Rotary Machinery Based On PCM Technology

Rotary machinery is widely used in the fields of industry, aero-space and military and so on. Inorder to ensure the safety of production, we must monitor the conditions of rotary machinery.Especially for structural health monitoring of the large rotary machinery, where we must transmit themultiple measured parameters from the rotary side to the fixed side, so that the PC on the fixed sidecan analyze, display and store the measured parameters. At the same time, in order to control therotary machinery such as smart rotor in real time, we must transmit the control signal sent by PC fromthe fixed side to the rotary side. This relates to the bidirectional transmission of signal on the rotarymachinery. Due to the large number of measured parameters, the multi-channel data acquisitionsystem must be designed to achieve synchronous data acquisition of multi-parameters. To transferlarge amounts of data acquainted, there must be a transmission channel with wide bandwidth toachieve high speed transmission of signals. In view of the structural characteristics of the rotarymachinery, the transmission channel should not be restricted by rotating speed. Also, there have to bean appropriate communication interface to achieve high-speed communication between the testingand control system and PC.In this paper, in order to avoid the defects of narrow bandwidth, poor immunity to interference,high costs of maintenance, restricted with rotating speed, complex communication interface with PCand inconvenient for System integration, a non-contact, real-time and multi-channel testing andcontrol system for rotary machinery based on PCM is designed to fulfill the requirements ofhigh-speed, low-cost, anti-electromagnetic interference, unrestricted with rotating speed, bidirectional,real-time and multi-channel. The system utilizes FIR to achieve high-speed, non-contact signaltransmission based on the smart rotor testing system. And it uses piezoelectric ceramic material assensors and actuators, a charge amplifier as the signal conditioning circuit, and FPGA as MCU, addwith A/D and D/A to construct the multi-channel synchronous data acquisition and control system.The data acquisition and control system communicate with the host computer by USB2.0. The dataacquisition software is programmed with labVIEW to achieve data acquisition, display and storage.