The typical spectrum of the gearbox is analyzed by spectrum, which eliminates the common faults of the gearbox. Combined with the analysis of the total vibration before, it is found that the vibration of the gearbox in the vertical direction is greater than the axial and horizontal directions. The vibration has a certain directionality and the vibration amplitude. It increases with the increase of load and is sensitive to changes in load. Moreover, the frequency of the main frequency component of the vibration is higher than 5 times the rotational frequency, and the amplitude of the vibration is also very large. Therefore, it is suspected that the gearbox has the possibility of resonance. In order to further determine the fault nature of the unit, two problems need to be solved: first, the determination of the forced vibration source; second, whether the natural vibration frequency of the components in the gearbox coincides with 290 Hz.
The determination of the forced vibration source and the natural vibration frequency. The determination of the forced vibration source is first performed after the connection between the gearbox and the compressor is disconnected, and when the motor single drive gearbox is running. Analyze test data. Conclusion According to the analysis, the screw compressor resonates due to the high-speed shaft of the gearbox under the excitation of the speed of the drive shaft of the reducer, which causes the unit to generate strong vibration. The elimination of resonance eliminates the resonance of the unit. Separated from the excitation frequency, the main methods are as follows: (1) Change the excitation frequency so that it is no longer consistent with the natural vibration frequency of the machine or structure, that is, increase or decrease the speed of the screw compressor to avoid it. The first-order natural frequency of the high-speed shaft of the gearbox. (2) Change the natural frequency to eliminate resonance. The natural frequency of the gearbox can be increased or decreased by changing its mass (weight) or rigidity. Increasing the stiffness increases the frequency, while increasing the mass reduces the natural frequency, but requires a complete analysis of the system before modifying the structure. (3) Install a damping damper at the outlet of the compressor to relieve the vibration excitation of the compressor by the gas pulsation, thereby reducing the forced vibration of 290 Hz generated by the active screw and reducing the excitation of the driven shaft of the gearbox.
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