Vibration diagnostics

Sept. 25, 2021, 8:44 a.m.

Дефекты подшипников

After identifying bearing defects and taking the equipment for repair, we always try to pick up the dismantled bearings from the repairmen, disassemble them and inspect them in detail. Exotic cases are sometimes encountered along with standard faults. One of the recent ones will be discussed further.

Unusual bearing defect 00

Vibration diagnostics

April 17, 2021, 10:50 a.m.

Эксцентриситет ротора, Вибродиагностика, Электромагнитные дефекты

Finally, let's touch on the topic of the dynamic eccentricity of the electric motor rotor. The defect is relatively rare and interesting. As usual, from my own practice, therefore, further there will be spectra, the search for the cause, and of course photographs.

Динамический эксцентриситет ротора электродвигателя

Vibration diagnostics

Feb. 22, 2021, 2:28 a.m.

Удары в муфтах, Расцентровка, Вибродиагностика

Двухшарнирная кулачковая муфта

Cam couplings with an elastic damping element are quite common in enterprises, lower requirements are imposed on their alignment than for elastic sleeve-finger couplings, but from personal experience this does not save from problems that arise with them. In this article, we will analyze a practical example of diagnosing a defect in a double-joint cam clutch.

Different

Dec. 17, 2020, 9:49 p.m.

Кавитация

Cavitation is one of the most damaging things that can happen in your fluid power system. It’s a great way to shorten the life of your components, thanks to the relentless pitting it can exact on metal parts. While there are countless videos online that discuss cavitation, these six are our favorites …

The 6 best cavitation videos

Vibration diagnostics

Dec. 16, 2020, 6:18 p.m.

Резонанс, Модальный анализ, Собственная частота, Вибродиагностика

As part of a seismic analysis for a 1000 horsepower vertical 14 pole induction pump motor the reed frequency was calculated using a finite element analysis (FEA) program. This paper will discuss the FEA modeling for the seismic analysis and natural frequency determination. The calculations were done for the
motor only on a rigid support. After the motor completed the standard factory tests, an impact test was conducted in the rigid mount condition to determine the structural natural frequencies. The tested values will be compared to the calculated values from the FEA model. This paper will also discuss the subsequent motor/pump system resonance problems that surfaced after the motor/pump was installed on site. This paper will highlight the importance of the system integrators design of the motor support structure to avoid structural resonance problems such as in this case.

Devices

Nov. 6, 2020, 11:07 a.m.

Дефект датчика, SPM

This short article will be useful for owners of SPM Leonova Diamond and Leonova Emerald instruments. We are talking about a defect in the shock pulse sensor that we encountered. It was not possible to solve the problem quickly through support, so we find the reason and fix the defect ourselves.

SPM 44000

Vibration diagnostics

Oct. 9, 2020, 8:46 p.m.

Дефекты подшипников, Вибродиагностика

Recently we faced an interesting problem - identical bearing defects were found on four identical centrifugal pumps for four months.

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Diagnostics of electric valves

Oct. 6, 2020, 8:51 a.m.

Мощность, АТЭ ТС-3000, Диагностирование, Арматура, Диагностика, Крутящий момент

First of all, in the nuclear power industry, but also in other industries, the direction of valve diagnostics is developing. The lion's share of all valves is occupied by valves with an electric drive and, depending on the type of power unit, their number can vary from 3000-4000 to almost 6000 units per power unit. Although not all fittings directly affect safety or power output, failure of just one mechanism is enough for fatal consequences, which, given the enormous laboriousness of repairing fittings located in an unsecured section, translates the diagnostics of valves from the category of "pampering" into a fairly serious science.

Vibration diagnostics

Sept. 20, 2020, 8:35 a.m.

Дефекты подшипников, Вибродиагностика

For another real example, I propose to consider vibration diagnostics of fan bearings. Let's disassemble the bearings and make sure that inspection is a key step in determining the root cause of the failure.

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