Technology Research, Based On The Hilbert Transform Of The Shaft Torsional Vibration Measurement

The development and current situation of domestic and foreign torsional vibration testing technology are analyzed in this thesis.We introduce a software method which can detect torsional vibration, based on Hilbert transformation demodulation. The design is based on DSP processor, at first the A/D picks up the signals controlled by FPGA; the signals are processed through the filter and stored in the dual-port RAM of the FPGA chip.And then the signals are processed by the method of phase demodulation of Hilbert transform. At last, the outputs are sended to computer by USB of DSP, and then we can accurately isolate the phase from torsional vibration signals to detect the bug.Firstly, the theory and technology of the Hilbert transformation based detection of torsinal vibration are introduced. Secondly, the hardware design and the set up of software platform are put forward and discussed, and the design of the hardware is also introduced, including the connection of DSP and the dual-port RAM,A/D, the external interface and configuration of DSP and FPGA; and then the software of this system are introduced which are the core part of this thesis.Including the phase demodulation of Hilbert transformation are implemented by DSP. Finally, hardware and software of the module are tested and simulated. The result of this research is provided with great signality of practical engineering and a valuable reference for detecting of torsional vibration.