RU1828542C - Method and device for diagnosing machine having several moving members - Google Patents

Abstract

The inventive source 2 of an alternating magnetic field and a receiver 4 of electromagnetic waves are placed on opposite sides on the body of the diagnosed machine, a signal with a predetermined repetition rate inherent in specific elements of the machine when it is operating in a given mode is extracted from a controlled signal, the amplitudes of the change of the extracted signal are recorded and use them as a diagnosed parameter. 1 s.p. f-ly, 3 ill.

Description

The invention relates to methods and means for diagnosing the operability of machines directly in the process of their operation, for example, automobile and airplane engines, as well as turbines.

In FIG. 1 is a diagram of an apparatus for implementing the method; in Fig.2 - spectrogram (approximate view) of the output signal with the machine idle; in FIG. 3 - spectrogram of a running machine.

A method for diagnosing a machine with several movable elements is carried out as follows.

During operation of the machine, a magnetic field is passed through it, like through a magnetic circuit, at one or several fixed frequencies, for which, on opposite sides of the machine body, a winding 1 connected to a generator 2 and a winding 3 connected to an electromagnetic receiver 4 are installed on it oscillations connected to the spectrum analyzer 5. Through the winding 3 and the receiver 4 receive the signal that has passed

through a running machine. During its operation, the moving parts of the machine change the magnetic resistance of the magnet wire, each of the parts with a frequency inherent in this moving element. As a result, the spectrum of the received signal contains harmonics, the amplitude and frequency of which characterize the operation of each of the moving elements of the machine in a given mode. When the operating mode of the machine deviates from the predetermined one, for example, due to the inoperability of its individual moving elements, the spectrum of the output signal changes relative to the control spectrum. The magnitude of the deviations of the amplitudes and frequencies of the spectral components of the output spectrum from the reference sample determines the nature of the deviation of the operating mode of the machine, including the nature of the possible malfunction.

A device for implementing this method includes a primary winding 1 connected to a high-frequency generator 2, and a secondary winding 3 connected to an electromagnetic oscillation receiver 4

Yu

00

ate

4

Yu

with

the output of which is connected to a spectral analyzer 5. Windings 2 and 3 are placed on different sides of the body 6 of the diagnosed machine.

An example of the method.

The internal combustion engine with a plunger pump is monitored. If, for example, a plunger of one of the pump sections hangs, the harmonics of the output signal spectrum due to the movement of this plunger will be absent, which will indicate the nature of the malfunction.

Thus, these method and device allow, without installing control sensors inside the machine, to expand the functionality of diagnostic tools of machines, to increase the depth of diagnosis.

Claims (2)

SUMMARY OF THE INVENTION 1. A method for diagnosing a machine with several moving elements, in which an alternating magnetic field source and an electromagnetic oscillation receiver are mounted on a machine body comprising a magnetic circuit, while the machine is operating, an alternating magnetic field of a fixed frequency is excited in its body and measuring 0 5 0 5 P variable component of the magnetic flux, a parameter characterizing the technical condition of the machine is distinguished from the controlled signal, characterized in that the source of the alternating magnetic field and the electromagnetic oscillation receiver are placed on opposite sides on the body of the diagnosed machine, and a signal with a given repetition rate is extracted from the controlled signal inherent to specific elements of the machine when it is operating in a given mode, the amplitudes of the change in the selected signal are recorded and used as a diagnosis cal option. 2. A device for diagnosing a machine with several moving elements, comprising first and second windings mounted on a magnetic circuit passing through the controlled elements of the machine, a high frequency generator connected to the first winding, and an electromagnetic oscillation receiver coupled to the second winding, characterized in that the first and second windings are installed on opposite sides of the magnetic circuit, and a frequency spectrum analyzer is connected to the output of the electromagnetic oscillation receiver.  N h NN h x N N cpue.i pr.2. "Ig. 3. ABOUT) 6J,