How to analyze vibration noise problems?
To solve the vibration and noise problem, we must first solve how to analyze the problem. There are many methods and genres here, which can be summarized as follows: top-down and bottom-up approaches.
The bottom-up is the main working method of the empirical school. The solution is similar to the case-solving. The evidence is collected first, and then the suspects are analyzed. The suspects are investigated and the hypothetical logical chain and evidence chain are given. Once the target is locked, make a targeted modification and re-do a motor to verify that the hypothesis is correct. If it is correct, the problem is solved, otherwise it will be reinstated.
Top-down is the main working method of the academic school. The academic school believes in theory and believes in methodology. At the time of design, it analyzes the possible fault characteristics through model technology, and changes the design if there is any problem. If unanticipated fault characteristics are found during the actual measurement, the problem will be gradually approached by improving the model accuracy and calculation method.
In actual work, we should do a great job. These two methods should be combined and used together. In the long run, we should focus on academics and experience. Below I highlight the top-down analysis process:
The first step: electromagnetic force calculation, generally need to calculate two types of electromagnetic force. One type is the electromagnetic force of each unit on the top of the stator for subsequent structural analysis, which is a real-time distributed force. The other is the electromagnetic force wave in the air gap, which is the wave function of the electromagnetic force, which is used to analyze the possible causes of the electromagnetic force. To put it simply: the former electromagnetic force is used for model calculation, and the latter electromagnetic force is used for reverse analysis. They are source and the expression is different.
The second step: modal calculation and verification. The accuracy of modal calculation is constrained by constraints, dip coating, winding and other factors, and it is not easy to obtain an accurate solution at a time. Therefore, it is necessary to correct the various constraints and damping settings by the actual detection results. The modal measurement method is generally hammering. Modal analysis is used to correct the model and can be used to predict the risk of resonance.
The third step: vibration response analysis, calculate the electromagnetic response of the first step applied to the model of the second step, the transient response of the casing and stator. Obtain the magnitude and phase of the acceleration and velocity vibration of the point of interest.
The fourth step: noise analysis and prediction, through the acoustic analysis software, calculate the frequency distribution and decibel of spherical noise.
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