Vibration acquisition and analysis instrument and vibration acquisition and analysis method

Abstract

The invention provides a vibration acquisition and analysis instrument and a vibration acquisition and analysis method, and the vibration acquisition and analysis instrument comprises a vibration signal conditioning device, a key phase signal processing device, a phase-locked frequency multiplication device, a vibration signal sampling device and a control processing device, wherein the vibration signal conditioning device is used for receiving a vibration signal of a measured rotary machine, which is sent from a vibration sensor, performing processing on the vibration signal, generating multi-channel vibration conditioning signals corresponding to different sensor types, and gating one way of the vibration conditioning signal for output according to the type of the vibration sensor and sampling requirements; the key phase signal processing device is used for receiving a key phase signal of the measured rotary machine, processing the key phase signal and generating a key phase pulse signal; the phase-locked frequency multiplication device is used for receiving the key phase pulse signal, processing the key phase pulse signal and generating a frequency multiplication signal; the vibration signal sampling device is used for receiving the frequency multiplication signal and the output vibration conditioning signal, adopting the frequency multiplication signal to sample the outputted vibration conditioning signal, and generating sample data; and the control processing device is used for receiving the key phase pulse signal and starting the sampling process under the trigger of the key phase pulse signal.

Description

technical field [0001] The invention relates to the field of vibration detection of power equipment, in particular to a vibration collection analyzer and a vibration collection analysis method. Background technique [0002] In recent years, in order to alleviate the power shortage, major power companies have continuously increased power investment and expanded new large-scale generating units. Due to the influence of design, manufacture, installation, operation, maintenance and other aspects, as well as the characteristics of large capacity, high parameters and complexity of the unit itself, the actual availability rate of large units is not high, and there is a big gap compared with similar units abroad . At present, the unplanned shutdown and unplanned output reduction of the unit due to the unstable operation state of the unit caused by factors such as the vibration defect of the main and auxiliary machines are still increasing. [0003] Using multi-channel portable vib...

AI Technical Summary

Problems solved by technology

[0007] In order to accurately extract the key phase signal from the background noise and vibration signal, the key phase processing circuit needs to have a certain trigger comparison voltage setting and duty cycle adaptability. The key phase signal trigger voltage of most existing analytical instruments is designed to be fixed , cannot be adjusted automatically, and it is difficult to meet the key-phase signal recognition of different signal levels, and the existing filtering method is not capable of adapting to a small duty cycle (such as 0.01% level).

Therefore, most of the existing analytical instruments do not have the self-adaptive capability of multiple key phase signal access;

[0008] (2) Insufficient access to vibration signals

Most of the vibration channel capacity of existing analytical instruments is insufficiently designed, generally single, double, 4, 6, 8 and 16 channels, and a single instrument cannot meet the comprehensive vibration monitoring of a large unit;

[0010] (3) Insufficient sample collection capacity:

[0011] Key-phase synchronization, multi-channel simultaneous, and full-period sampling are the basic requirements for vibration acquisition and analysis instruments, but most analysis instruments only provide conventional fixed-length samples (such as: 8 periods of 1024 points) acquisition, because few instruments have customizable Long sample, fine spectrum analysis function

[0012] (4) Insufficient communication capability of host computer interface:

[0014] The communication rate of the serial port is low, which cannot meet the real-time transmission of large-capacity sample data; although the EPP parallel port has a certain data transmission bandwidth, computers equipped with EPP parallel ports, especially notebook computers, are very difficult to find and have poor versatility; It has a high communication rate and a simple interface, but the USB communication used for vibration data transmission often needs to install a specially developed data transmission driver, which does not have good software versatility, and the USB communication driver with poor performance is directly It affects the reliability of the system; the communication rate of the field bus interface is also high, but its communication protocol design is mainly short messages (within 100B), which are mainly used in the transmission of a small amount of data for field intelligent instruments and meters. The vibration signal transmission as a unit often requires a large number of data packet decomposition, and even needs to expand the existing standard protocol, which brings the lack of versatility

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