Compa en san juan: Comprá en San Juan — Clasificados gratuitos de San Juan, Argentina

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Scientific and technical reviews, analysis of publications

Scientific and technical reviews, analysis of publications

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Diagnostics of rotary equipment by stationary means of vibration control.

The issue of creating effective and inexpensive multi-channel means of continuous monitoring of the state of rotary equipment in secondary processes, supplemented by diagnostic capabilities, is considered. Diagnostics of the entire range of dangerous defects is carried out in them according to the data of broadband vibration measurements at low, medium and high frequencies, as well as measurements of narrow-band vibration and current spectra with the selection of the most intense components. Part of the state thresholds for controlled parameters is determined by the norms, the other part is formed automatically according to the accumulated measurement results.

Programs for processing the results of measurements and diagnostics are optimized for implementation without a computer, on signal processors. This made it possible to develop and prepare for production a low-cost device for early warning and diagnostics of typical rotary equipment with up to eight rotation bearings. The device can be used both in stand-alone mode and as part of more complex control and monitoring systems that require diagnostics of various objects

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Systems of monitoring and diagnostics of the SMD-4 series. Construction and use technology

1. Structure of systems.

The SMD-4 series is not specific systems, but a technology for building stationary and mobile self-learning monitoring and diagnostic systems for machines and equipment with rotation units operating in typical operating modes. This technology allows for a specific control object to build a system from basic software and hardware elements to solve specific problems from the list below:

  • equipment vibration monitoring (according to standards) with warning alarm,
  • monitoring of equipment condition by informative parameters of vibration and current, and, if necessary, thermal and other processes,
  • forecast of residual life based on trends of controlled parameters under dangerous state changes,
  • diagnosis of the causes of detected changes in the state on the basis of typical defects.

These tasks have an effective solution only in the case of parallel execution of two additional functions — determining the current mode of operation of the control object and self-diagnostics of the system used, respectively, both of these functions are embedded in any of the modifications of SMD-4. The control of the operating mode is carried out according to the results of continuous measurement of the vibration of the object, the frequency of rotation of its nodes or the current of the electric motor, the test control of the system’s operability is carried out continuously for each measuring channel.

SMD-4 for any purpose is made up of five main elements. These are measuring converters (sensors), multichannel digital signal meters (MCI), computers that receive and process digital signal flow, computer networks and control devices (output relays). In the simplest case, all SMD-4 elements, except for sensors, are placed in one housing (Fig. 1). The monitor that displays the final and, if necessary, intermediate results, as a rule, is placed in a separate device.

Fig 1. The simplest SMD-4 for 4 vibration measurement channels and one for rotational speed. One housing contains a digital meter, a computer with a monitoring program (can be supplemented with a diagnostic program) and output relays. The results of the system are presented on a wirelessly connected laptop or tablet.

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Vibration analysis tools

Revised fifth section of the textbook «VIBRATION DIAGNOSTICS

MACHINERY AND EQUIPMENT. VIBRATION ANALYSIS, 2018

A.V.Barkov, N.A.Barkova

1. General requirements

The general structure of vibration measurement and analysis systems, whether it is technical means of vibration control, monitoring or diagnostics, includes primary measuring transducers, matching devices, communication lines, analysis tools proper, a database (in the simplest case, threshold devices) and tools (programs ) information processing (Figure 1).

Fig.1. Structural diagram of the vibration measurement and analysis system: IP — measuring transducers; US — matching device; AN — analyzer; DB — database; SDI — Information Processing Tools

Modern information technologies, which include measurement and analysis of various processes, are developing towards the widespread use of digital technology. Therefore, in the means of measuring and analyzing vibration, only measuring transducers usually remain analog devices, and analog-to-digital converters (ADCs) are increasingly included in their composition, and further transmission of digital signals to analysis tools (computers) is carried out both via wired and wireless communication lines.

Depending on the tasks solved with the help of vibration measurement and analysis tools, they are subject to various technical requirements. Existing tools can be divided into several classes, namely:

  • means of tolerance control and emergency protection;
  • means of vibration monitoring and condition monitoring by vibration;
  • means of vibration diagnostics;
  • research instruments and systems.

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How to use the achievements of vibration monitoring and diagnostics of machines and mechanisms

Lecture for technical managers of enterprises

A.V.Barkov. Northwestern Training Center, St. Petersburg. 2014 ©

The development of information technology is proceeding at a rapid pace and in the near future almost all the information necessary for making operational decisions about the current state of operating units equipped with sensors of the processes occurring in them will be available. But the task of obtaining optimal information about the state quickly and at a minimum of costs should be solved by specialists from operating organizations.

The easiest way is to entrust its solution to the manufacturers of the units, and they solve the issues of emergency protection of their products. Moreover, some of the manufacturers began to intensively develop authorized maintenance of complex units, and in order to reduce the cost of this maintenance, they began to equip units with diagnostic information collection systems, expanding the capabilities of the primary sensors of emergency protection systems and installing additional sensors and data collection tools.

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Significant date of domestic vibration diagnostics

Alexander Alekseevich Azovtsev,

founder of the school of vibration diagnostics
ship electrical equipment

This year, October 17 marks the 100th anniversary of the birth of Azovtsev Alexander Alekseevich, an outstanding specialist in the field of ship electrical engineering, who made a huge scientific and practical contribution to the improvement of the Russian fleet. It was Alexander Alekseevich who became the founder of the school of vibration diagnostics of ship electrical equipment, which released into the creative life the leading specialists of enterprises that are members of the VAST Association.

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From vibration measurement to condition-based maintenance. Seventy years of continuous progress

John S. Mitchell , San Juan Capistrano, CA

(John S. Mitchell. San Juan Capistrano, California)

Translation with permission of the author
John S. Mitchell
and editor-in-chief of the magazine «Sound and Vibration»
Jack K. Mowry

Translation by Yu.A. Azovtseva

Over the past 70 years or so there have been dramatic changes in the methods, tools, technologies and practices of measuring, analyzing and monitoring machinery. Ranging from mechanical instruments that could collect data from simple low-frequency time signals, to modern high-performance digital instruments that analyze the chemical composition of fluids and wear products in lubricants, motor current, performing complex spatial vibration, ultrasonic and thermographic analyzes. Changes in this area are amazing, especially in the last twenty years. The introduction of microprocessor-based data collectors/analyzers for on-site operation of equipment, personal computers for automatic monitoring, diagnostics and information management, in combination with major advances in electronics and signal processing techniques, have significantly advanced the possibilities for assessing the technical condition, detecting and diagnosing faults. It is now almost inconceivable that today’s portable data collectors have much greater functionality and efficiency than a truckload of laboratory analysis equipment less than twenty-five years ago! Today, most faults can be detected at an early stage, in sufficient time to minimize their impact on performance, thus avoiding accidents. Condition-based monitoring and maintenance methods have come a really long way! The path that has passed and how we have come to the present state is a very interesting story, and the individuals who have made such a great contribution are worthy of great gratitude.

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On-board systems for monitoring and operational diagnostics of rotating equipment

Review compiled by A.V. Barkov

LLC «Vibrotekhnika» 2013 ©

Modern machines and equipment require less and less human participation in their operation. Maintaining and changing their operating modes is usually the task of complex automatic control systems. With this approach, only if maintenance (repair or replacement) is necessary according to the actual state, it is required to involve the appropriate specialists. But to control the actual state, a system for monitoring the state and diagnostics is necessary — and it must also be automatic, providing diagnostics and forecasting the state of the control object in any operating mode.

For many years, the diagnostics of machines and mechanisms was carried out with the participation of a person who chose and maintained the optimal modes of operation for diagnostics, even in the case when all the necessary measurements were carried out automatically. Without a specialist, as a rule, no decision was made on the need for urgent maintenance (current repairs), even if the diagnosis and prognosis were carried out in the automatic mode of the diagnostic system. But the modern operating conditions of machines and equipment in many industries are such that completely autonomous systems for monitoring the condition and diagnostics are indispensable. The scientific director of the developments carried out by the VAST Association in this direction shares his experience in solving many problems of creating such systems, often called «on-board» systems of monitoring and operational diagnostics.

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How to choose monitoring and diagnostic tools for machines and mechanisms

A.V. Barkov, N.A. Barkova, V.V. Fedorishchev

LLC «Vibrotekhnika», SEVZAPUCHTSENTR. 2012 ©

The high accident rate of operated equipment is very often determined not by a natural decrease in reliability as the resource develops, but by errors made by maintenance personnel during operation and during maintenance or repair. The influence of the «human factor» on the safety of the operation of numerous technical means is growing so rapidly that it cannot be ignored when solving the problems of monitoring, diagnosing and predicting their condition.

What factors should be taken into account when choosing modern means of monitoring and diagnosing machines and mechanisms in order to increase the safety of their operation, taking into account such an impact and optimize the costs of both monitoring and diagnostics, and maintenance of control objects. How to equip duty personnel servicing equipment in production without prior diagnostic training. Experts who have devoted many years to the creation and implementation in many countries of the world of intelligent diagnostic systems for rotating equipment for secondary processes share their experience in these matters.

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Vibration control and monitoring. © The simplest systems for monitoring the condition of machines and equipment

The review was compiled by A.V. Barkov and N.A. Barkova.

SEVZAPUCHTSENTR. 2011 ©

Vibration control, vibration monitoring, vibration diagnostics are the stages of development in the study of vibration of machines and equipment, in the creation of means for measuring and analyzing vibration. Modern methods and means of vibration analysis are constantly becoming more complex, requiring more and more knowledge from specialists using them. The simplest means of vibration measurement and control continue to be produced under the current standards of vibration control, both technical and sanitary. But the means of measuring medium complexity and methods for analyzing the results obtained, available to personnel without special training, are used only in sanitary control and monitoring of noise and vibration. According to the specialists of the North-Western Training Center, this is a clear gap in the development of vibration monitoring and diagnostics in technology, because the tasks of effective condition monitoring can be solved by personnel servicing machines and equipment without long-term special training. It is only necessary to provide it with quickly mastered technical means of measurement and instructions for making operational decisions. This review is devoted to the analysis of the most rapidly implemented achievements in this direction

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Basic requirements for modern means of monitoring the condition and diagnostics of machines and equipment

The review was compiled by A.V. Barkov.

WAST Association. 2011 ©

It is possible to significantly reduce the costs of operating the production assets of enterprises, first of all, by reducing the amount of repair and maintenance of the most worn out — rotating equipment without loss of its reliability and, if possible, with an increase in the resource. And for this it is necessary to introduce effective technologies for monitoring, diagnosing and predicting its condition, which will allow timely replacement of unattended equipment and only if necessary prepare and carry out repairs or adjustment of serviced equipment.

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The tasks of implementing technologies for monitoring the condition and diagnostics of working machines

The review was compiled by A.V. Barkov, VAST Association and N.A. Barkova, NOU North-West Training Center.

SEVZAPUCHTSENTR. 2011 ©

The time has come when many enterprises have to freeze investments in new equipment and continue to work at old, often exhausted, production facilities. How to minimize economic losses in this situation due to defects, downtime of equipment, elimination of the consequences of emergency failures and, finally, to reduce the cost of current and scheduled repairs, the volume of which is often unreasonably high?

The answer suggests itself — it is necessary to introduce its technical diagnostics into the equipment maintenance regulations.

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