Precursor analysis of air compressor failure of compressed air foam fire truck

Fire Equipment Research Fan Yongzhong (Shanghai Fire Corps, Shanghai 200051) The failures of foam fire truck air compressors, such as bearing pitting and excessive screw wear, use virtual and real-world technology to set up a set of air compressor vibration based on LabVIEW. The acquisition system is used to analyze the vibration model of the air compressor, and the vibration of the air compressor is simplified into the forced vibration of the two-degree-of-freedom system under the condition of simple harmonic excitation.

Acceleration value sensing! S-number quasi-electricity card-calculation M machine 圄1 air compressor vibration signal acquisition and analysis system 2 vibration model air compressor work, screw pump, power take-off, engine and other rotating components because of production, assembly, use, etc. Axis) The center of gravity will inevitably have a certain amount of eccentricity. During the rotation, the eccentricity will produce eccentric rotation and inertial force. These factors will generate periodic excitation and cause vibration of the air compressor, as shown in 圄2. The rotary shaft of the air compressor is generally horizontally placed. If the eccentric mass is located at the cross section A of the rotating shaft, the eccentric centrifugal force acting on A and with respect to the center of rotation is as shown in the formula (1).

When the rotating shaft rotates at a high speed, the resultant force with gravity will form a periodic harmonic excitation to the shaft end, causing the vibration equation of the periphery to be as shown in equation (2).

The amplitude value W is the eccentric shaft speed.

It can be seen that the main frequency of the vibration of the air compressor has a great relationship with the shaft speed. In the air compressor, the speed of the power take-off and the screw pump are basically the same, so the vibration frequency is single, and the whole vibration process of the air compressor can be performed. Simplified into forced vibrations in a two-degree-of-freedom system in the case of harmonic excitation, as shown in 圄3. Among them, OT1 represents the air compressor, and OT2 represents the power take-off.

The system vibration equation of 圄3 is shown in equation (3).

(b) Spectrogram normal air compressor vibration signal electric mo (filtering) time / s (b) spectrogram forced vibration of the two-degree-of-freedom system under the condition of simple vibration excitation of the air compressor vibration signal before failure.

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