Influence Investigation of Rolling Bearing Test Conditions on the Informativity Assessment of their Technical Condition

The paper presents an alternative approach to metrological support and assessment of the technical condition of rolling bearings in operation. The analysis of existing approaches, including methods of vibration diagnostics, envelope analysis, wavelet analysis, etc. Considers the possibility of applying a phase-chronometric method for support on the basis of neurodiagnostics bearing life cycle on the basis of the unified format of measurement information. The possibility of diagnosing a rolling bearing when analyzing measurement information from the shaft and separator was evaluated.

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The possibility of an extension to the floor of a non-residential building using lightweight structural elements of increased rigidity

Construction and Architecture ◽

10.29039/article_5ca75f9d41ab84.76005030 ◽

2019 ◽

Vol 7 (1) ◽

pp. 28-33

Author(s):

Ольга Хрянина ◽

Ol'ga Hryanina ◽

Юсеф Янгуразов ◽

Yousef Yangurazov

Keyword(s):

Residential Building ◽

Technical Condition ◽

Structural Elements ◽

Main Bearing ◽

Extensive Experience ◽

Satisfactory Condition ◽

Test Conditions ◽

Small Cracks ◽

The Moment ◽

Storey Building

The authors summarized the extensive experience of reconstruction of buildings taking into account the superstructure. A visual full-scale inspection of the actual technical condition of the main bearing and enclosing structures of a non-residential one-storey building was carried out. The possibility of superstructure on the floor of the building using lightweight structural elements of high rigidity is considered. According to the results of the survey, an assessment of the technical condition of the structures is given. The General satisfactory condition of the foundations, walls, internal supports, building covering was revealed. Unacceptable deflections of plates, cracks in the plates and between them are not fixed. However, in the wall at row G has haphazardly small cracks on external verst masonry, which appeared likely to result from the soaking of the masonry from leaks from the roof and changes in temperature and humidity. At the moment, the cracks have stabilized, the leaks have been eliminated. The calculations of the foundations of the test conditions of the stress under the foot and stress check given add-in. Conclusions and recommendations are formulated. For the wall on the axis G in the process of construction and operation must be monitored. In case of activation of development of constructive cracks to solve a question of possible strengthening.

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Electroresistive method for monitoring the technical condition, quality, reliability and safety the supports of rolling of electrical machines

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/1211/1/012021 ◽

2022 ◽

Vol 1211 (1) ◽

pp. 012021

Author(s):

K V Podmasreryev ◽

V V Markov ◽

V V Mishin ◽

A V Selikhov ◽

N V Uglova

Keyword(s):

Mathematical Modeling ◽

Electrical Resistance ◽

Experimental Studies ◽

Rolling Bearing ◽

Technical Condition ◽

Electric Machines ◽

The State ◽

Electrical Machines ◽

Technical State ◽

Internal Environment

Abstract The necessity of monitoring the technical condition of the rolling supports of electric machines has been substantiated. It is proposed to use the electrical resistance of the bearing as an indicator of the technical condition the rolling support. The results of mathematical modeling of electrical resistance in the form of a function of resistance from factors of the internal environment of the bearing and modes of its assembly and operation in a rolling bearing are presented. An electroresistive method for monitoring the technical state the rolling support is proposed, which differs from the known methods by original algorithms for collecting information about the state of bearing parts, experimental studies have been carried out to confirm the efficiency of this method.

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Vibration diagnostic of electric motor roller bearings

E3S Web of Conferences ◽

10.1051/e3sconf/201912402008 ◽

2019 ◽

Vol 124 ◽

pp. 02008 ◽

Cited By ~ 2

Author(s):

N. V. Hruntovich ◽

A. A. Kapanski ◽

I. V. Petrov ◽

E. E. Kostyleva

Keyword(s):

Electric Motor ◽

Power Plants ◽

Rolling Bearing ◽

Technical Condition ◽

Diagnostic Model ◽

Rolling Bearings ◽

Accuracy Class ◽

Vibration Diagnostics ◽

Bearing Defects ◽

Asynchronous Motors

The low quality of the new rolling bearings leads to additional costs for electric motor repair, and additional expenses connected with the technological process, value of which can reach from several thousand to tens of thousand dollars. To increase detection, the reliability of rolling bearing defects of asynchronous motors, complex vibration diagnostics was used at informative frequencies in the vibration frequency and amplitude in the range of 5-5000 Hz. Based on the diagnostic model of rolling bearings the software program “Tayamnitsa” is developed, which allows to calculate the diagnostic frequency corresponding to certain defects, determine the defect level and form a diagnostic table for defects. Vibration diagnostics of new and used rolling bearings have been conducted for various regional enterprises and power plants. It has been determined that 40-50% of used bearings are removed in good technical condition. When new bearings were diagnosed in the 500-5000 Hz range, only 48.4% of the bearings are considered serviceable due to the low accuracy class of metal processing and unacceptably high vibration level.

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ROLLING BEARING TECHNICAL CONDITION FORECASTING USING VIBRATION ACCELERATION OVERALL LEVEl

Kontrol Diagnostika ◽

10.14489/td.2020.10.pp.012-019 ◽

2020 ◽

pp. 12-19

Author(s):

Yu. V. Sarapulov ◽

V. A. Sidorov ◽

A. E. Sushko ◽

R. A. Khasanov

Keyword(s):

Practical Importance ◽

Rolling Bearing ◽

Technical Condition ◽

Normal Operation ◽

Threshold Values ◽

Vibration Acceleration ◽

Extensive Experience ◽

Corporate System ◽

Vibration Parameters ◽

Bearing Damage

Traditionally, the assessment of changes in the technical condition of individual components and mechanisms of rotation machines in industry is associated with trends analysis of various vibration parameters. Over the decades of using vibration analysis, we have accumulated extensive experience in faults locating and critically determining, however, it is the assessment of the remaining life that regulates the timing of maintenance and repair activities that is of great practical importance. This article uses the example of a pump unit rolling bearing to consider approaches to predicting the growsup stage of defects based on the analysis of values of vibration acceleration levels. The stages of normal operation and other stages of bearing damage are highlighted, threshold values are calculated and dependences of changes in diagnostic criteria for each stage of the life cycle are constructed. The obtained dependencies show results that are similar in general, but individual in their values, therefore, the accumulation of possible scenarios of events allows creating a knowledge base for predicting the behavior of a mechanical system. The necessary tools for multifactor forecasting were implemented within the SAFE PLANT software platform (LLC SPA DIATECH, Moscow) and are successfully applied at Uralkali PJSC for monitoring the technical condition of all technological equipment and managing MRO processes by integrating the results of diagnostics and forecast assessments into the ORACLE corporate system.

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Report 17: Design of a Test Rig to Assess the Effect of Three Loading Parameters on Rolling-Bearing Performance

Proceedings of the Institution of Mechanical Engineers Conference Proceedings ◽

10.1243/pime_conf_1967_182_192_02 ◽

1967 ◽

Vol 182 (7) ◽

pp. 95-98

Author(s):

D. B. Jones ◽

E. D. Yardley

Keyword(s):

Roller Bearing ◽

Rolling Bearing ◽

Impact Loads ◽

Test Rig ◽

Axial Impact ◽

Roller Bearings ◽

Test Conditions ◽

Service Conditions

In order to obtain information on the performance of certain types of 70 mm bore roller bearing for use in motors of advanced construction, a test rig which will reproduce the load and speed parameters expected to be encountered in service has been designed. The rig can apply steady axial and radial loads and an axial impact to give service conditions considerably more arduous than those which would be recommended by the bearing manufacturers. The programme of work is especially concerned with the effect of various axial impact loads on the performance of roller bearings which are already subjected to steady axial and radial loads. This report covers in detail the design of the test rig and outlines the range of test conditions available, and the types of bearing that can be tested.

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Monitoring and diagnostics of the technical condition of the asynchronous traction motor of locomotives using artificial neural networks on the railways of the Republic of Uzbekistan

Proceedings of Petersburg Transport University ◽

10.20295/1815-588x-2020-4-514-524 ◽

2020 ◽

Vol 17 (4) ◽

pp. 514-524

Author(s):

A. V. Grishchenko ◽

◽

О. R. Khamidov ◽

Keyword(s):

Neural Networks ◽

Practical Importance ◽

Rolling Bearing ◽

Technical Condition ◽

Rolling Bearings ◽

Frequency Spectra ◽

Software Complex ◽

Asynchronous Traction Motor ◽

The Republic ◽

Analysis Of Failures

Objective: Diagnostics of malfunctions of rolling bearings of an asynchronous traction electric motor (ATEM) of locomotives using artifi cial neural networks. Methods: To control and diagnose the technical condition of the ATEM bearing units of locomotives, a hardware-software complex and data analysis methods are used. Results: We investigated the malfunctions of the ATEM rolling bearing of locomotives. The analysis of failures of locomotive bearing units is carried out. Vibration and current signals and the corresponding frequency spectra of an ATEM operating under normal conditions and with various bearing faults are considered. A model for assessing the technical condition of rolling bearings of locomotives has been developed, and the importance of anticipatory diagnostics has been substantiated, which makes it possible to identify defects in advance at the earliest stage of their development. Practical importance: The results of the research can be used in the system for diagnosing the technical condition of rolling bearings of traction electric motors of locomotives in real time.

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Effects of Fundamental Frequency Contours on Sentence Recognition in Mandarin-Speaking Children With Cochlear Implants

Journal of Speech Language and Hearing Research ◽

10.1044/2020_jslhr-20-00033 ◽

2020 ◽

Vol 63 (11) ◽

pp. 3855-3864

Author(s):

Wanting Huang ◽

Lena L. N. Wong ◽

Fei Chen ◽

Haihong Liu ◽

Wei Liang

Keyword(s):

Cochlear Implants ◽

Fundamental Frequency ◽

Signal To Noise Ratio ◽

Lexical Tone ◽

Signal To Noise ◽

Sentence Recognition ◽

Test Conditions ◽

Age Appropriate ◽

F0 Contour ◽

Appropriate Sentences

Purpose Fundamental frequency (F0) is the primary acoustic cue for lexical tone perception in tonal languages but is processed in a limited way in cochlear implant (CI) systems. The aim of this study was to evaluate the importance of F0 contours in sentence recognition in Mandarin-speaking children with CIs and find out whether it is similar to/different from that in age-matched normal-hearing (NH) peers. Method Age-appropriate sentences, with F0 contours manipulated to be either natural or flattened, were randomly presented to preschool children with CIs and their age-matched peers with NH under three test conditions: in quiet, in white noise, and with competing sentences at 0 dB signal-to-noise ratio. Results The neutralization of F0 contours resulted in a significant reduction in sentence recognition. While this was seen only in noise conditions among NH children, it was observed throughout all test conditions among children with CIs. Moreover, the F0 contour-induced accuracy reduction ratios (i.e., the reduction in sentence recognition resulting from the neutralization of F0 contours compared to the normal F0 condition) were significantly greater in children with CIs than in NH children in all test conditions. Conclusions F0 contours play a major role in sentence recognition in both quiet and noise among pediatric implantees, and the contribution of the F0 contour is even more salient than that in age-matched NH children. These results also suggest that there may be differences between children with CIs and NH children in how F0 contours are processed.

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Top-Down Processing and Visual Reorientation Illusions in a Virtual Reality Environment

Swiss Journal of Psychology ◽

10.1024/1421-0185.63.3.143 ◽

2004 ◽

Vol 63 (3) ◽

pp. 143-149 ◽

Cited By ~ 3

Author(s):

Fred W. Mast ◽

Charles M. Oman

Keyword(s):

Virtual Reality ◽

Visual Processing ◽

Line Length ◽

Perceptual Cues ◽

Virtual Reality Environment ◽

Top Down ◽

Test Conditions ◽

The Subject ◽

Processing Mechanisms

The role of top-down processing on the horizontal-vertical line length illusion was examined by means of an ambiguous room with dual visual verticals. In one of the test conditions, the subjects were cued to one of the two verticals and were instructed to cognitively reassign the apparent vertical to the cued orientation. When they have mentally adjusted their perception, two lines in a plus sign configuration appeared and the subjects had to evaluate which line was longer. The results showed that the line length appeared longer when it was aligned with the direction of the vertical currently perceived by the subject. This study provides a demonstration that top-down processing influences lower level visual processing mechanisms. In another test condition, the subjects had all perceptual cues available and the influence was even stronger.

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Discussion on “Rolling bearing applications” at the Manchester Section of the Institution

Journal of the Institution of Production Engineers ◽

10.1049/jipe.1948.0024 ◽

1948 ◽

Vol 27 (8) ◽

pp. 416

Author(s):

Morton ◽

Allan ◽

Hayton ◽

Gejji ◽

Murphy ◽

...

Keyword(s):

Rolling Bearing

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