Vibration diagnostics → Putting modal analysis into practice
April 19, 2020, 12:38 a.m.Резонанс, Вибродиагностика, Модальный анализ
I want to devote this article to the practical application of modal analysis. I have never dealt with modal analysis, there were no devices with corresponding functions, and now they are not and are not expected. Very expensive. But this is not a reason to despair and put an end to such an interesting method. The solution to the problem is 3D modeling and calculation of vibration modes. How I came to this, how to do it and what I got in the end - read on.
![Image](/media/users/2/photos/photo_Qw0E3UF.jpg)
Vibration diagnostics → The weakening of the landing of the coupling half on the motor shaft
April 14, 2020, 5:54 p.m.Вибродиагностика, Ослабление посадки на валу
Poor repair quality is the key to problems with your equipment. With a developed system of collective irresponsibility, the specialist in technical diagnostics is the last frontier in protecting equipment from the "human factor". In this article, I propose to consider an example of the detection of marriage after repair of an electric motor.
![Image](/media/users/2/photos/photo_JpqhGkN.jpg)
Vibration diagnostics → The practical result of the transition to servicing equipment in technical condition at the enterprise LLC Tomskneftekhim
April 7, 2020, 12:43 a.m.It is always interesting to get acquainted with the results of the work of colleagues from other enterprises. See what problems they face, what tasks they have to solve. Unfortunately, in the field of technical diagnostics, specialists are in no hurry to share their experience and knowledge. Therefore, with special thanks to colleagues from Tomskneftekhim, I propose to look at examples from their practical activities.
![Image](/media/users/2/photos/photo_JKSCsNQ.jpg)
Vibration adjustment → Alignment of the pump X 80-50-200
March 18, 2020, 11:43 a.m.Расцентровка, Виброналадка, Вибродиагностика
The frequency of encounter with such a defect as misalignment depends on the culture of equipment installation and repair at your enterprise. On mine there are some problems with this, which makes my professional career more diverse. I propose to consider the classic practical case of misalignment and evaluate its effect on vibration parameters.
![Image](/media/users/2/photos/photo_8yRQaJk.jpg)
Vibration diagnostics → Resonant fan design
March 15, 2020, 2:19 p.m.Vibration adjustment → Elimination of resonance on a fan type VRAN 9
March 14, 2020, 8:07 p.m.Виброналадка, Вибродиагностика, Резонанс
The fight against vibration of fans is a special niche in the practice of vibration diagnostics. In many enterprises, fans turn a blind eye - they say cheap, low-liability, etc. But in my opinion, fans are the main source of experience for a beginner vibration diagnostics / vibration adjuster. Fans, as a rule, are mounted / operated in violation of the requirements, have low rigidity, and accordingly a huge mass of defects is manifested on them. In this article, we consider the effect of improper installation on the vibration of the unit, we localize the defect and eliminate it.
![Image](/media/users/2/photos/photo_b56Fj0l.jpg)
Vibration diagnostics → Driving effect of the vertical pump coupling
March 8, 2020, 8:59 a.m.Поводковый эффект муфты, Вибродиагностика
In this article I want to highlight a relatively rare defect, which is usually called the coupling leash effect. The problem is the uneven loading of fingers in the holes, which leads to an uneven load on the fingers during operation of the unit. As a result, a radial force appears, transmitted to the bearings, the vibration of which we measure. The defect is manifested the stronger, the more fingers in a row are incorrectly loaded (in other words, the more fingers do not participate in the operation of the coupling). Let's move on to a real practice example.
![Image](/media/users/2/photos/photo_yE1JV4J.jpg)
Vibration diagnostics → Vibrodiagnostics of the pump bearing D 2500-62-3
March 7, 2020, 12:08 p.m.Vibration diagnostics → Electromagnetic defect of the stator of an asynchronous electric motor
Feb. 26, 2020, 7:42 p.m.Vibration diagnostics → Influence of induced vibration on fan bearings
Feb. 25, 2020, 6:13 p.m.Дефекты подшипников, Вибродиагностика
Another interesting example from practice. Two centrifugal fans of 3000 rpm are installed side by side, conventional air filters are at the inlets, the pressure pipe is common, the pressure pipes are rigidly connected to the cochlear flange. One is always at work, the second is in reserve. Switching once a month.
![Fan circuit](/media/users/2/photos/photo_O6P76xM.jpg)
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