What Are the Different Types of Vibration Monitoring?

For rotating equipment, most faults are closely related to mechanical movement or vibration. Vibration detection has the characteristics of direct, real-time and wide coverage of fault types. Therefore, vibration detection is the core part of various predictive maintenance technologies for rotating equipment. Other predictive maintenance technologies such as infrared thermal imaging, oil analysis, and electrical diagnosis are effective supplements to vibration detection technology.

Vibration monitoring

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In vibration predictive maintenance projects, not only help to master the use of related software and hardware equipment, but also

The term vibration monitoring has been proposed abroad more than 50 years ago, but due to the lack of knowledge of test technology and vibration monitoring diagnostic fault characteristics at that time, this technology did not develop significantly before the 1970s. Vibration monitoring in China also has a history of more than 30 years. Due to the special nature of domestic equipment vibration, it has unique insights in the research of vibration monitoring fault diagnosis methods and fault mechanisms. After more than 50 years of field fault diagnosis practice, we have accumulated a wealth of knowledge and experience in the characteristics of unit vibration faults, and have made long-term and in-depth research on the generation of many of these faults and the mechanism of vibration generation. Corrects traditional misunderstandings. In terms of diagnostic thinking mode, forward reasoning was proposed, completely reversing the situation where the cause of vibration monitoring failure was difficult to pinpoint. If forward reasoning is used, the accuracy rate of vibration fault diagnosis of the unit is generally above 80%.

Vibration monitoring fault diagnosis is currently divided into online diagnosis and offline diagnosis. The former is a line diagnosis of the cause of vibration failure of the unit in the operating state, so that the operator can make corrective actions to prevent the accident from expanding. Therefore, on-line diagnosis is relatively urgent in terms of diagnosis time, and is currently implemented by a computer, so it is also called an automatic expert diagnosis system. The core of the system is expert experience, but how to systematically and systematically divide the expert experience of distribution into a computer language is a technical problem that many experts at home and abroad are currently studying, so this diagnostic system cannot be misunderstood as Can completely replace vibration experts. Even when it comes, it is diagnostic experts who design and manufacture diagnostic systems to serve operators who lack vibration knowledge and experience, rather than replacing vibration experts with diagnostic systems.

Vibration monitoring off-line diagnosis is a diagnosis performed to eliminate vibration failures. This diagnosis is less urgent in terms of time. Vibration signals and data can be generated for careful analysis, discussion, or simulation experiments. Therefore, it is called vibration. Monitor offline diagnostics. Offline diagnosis is more specific in fault diagnosis than online diagnosis, so it is more difficult.

Vibration monitoring offline fault diagnosis technology includes diagnostic thinking method, vibration fault range and its characteristics (including data processing) and mechanism. But generally speaking, the fault diagnosis technology mainly refers to the fault characteristics and mechanism, and the research on the fault diagnosis thinking mode and fault range has not yet attracted due attention.

By monitoring the condition of the machine or structure under working vibration, the machine or structure can be diagnosed, environmentally controlled, and rated; the dynamic vibration of the machine or structure can be used to obtain the dynamic performance of the measured object: natural frequency, damping , Response, modal and other information, find weak links, improve its anti-vibration ability by improving the design, or improve the working environment and performance of the machine through vibration isolation treatment.

1. Structural resonance caused by electromechanical equipment of paper mills

Application fields for vibration monitoring (6 photos)

2. The impact of vibration caused by subway operation on the surrounding environment

3.Effect of the vibration of coal dryer on the structure of the steel plant

4.Vibration test of centrifugal pump in chemical plant

5.Vibration test of subway track bed and tunnel structure

6. Dynamic characteristics test of highway overpass