scholarly journals DETERMINATION OF A TECHNICAL CONDITION OF THE EQUIPMENT OF THE LINE OF A DRIVE OF ROLLING ROLLS ON THE SPEED OF PROPAGATION OF THE SHOCK PULSE

2021 ◽  
pp. 21-24
Author(s):  
Andriy Baglai
Keyword(s):  
Delay Time ◽  
Impact Load ◽  
Technical Condition ◽  
Pulse Velocity ◽  
Diagnostic Feature ◽  
Shock Pulse ◽  
Intermediate Shaft ◽  
Speed Of Propagation ◽  
The Impact

One of the ways to determine the technical condition of the equipment of the line working rolls - spindles - gear cage - root coupling - reducer - intermediate shaft - engine is considered. In each connection there is wear of contact elements, for example, bronze inserts of spindles, teeth of gears. According to the known method, the amount of current wear of the elements and the gaps caused by them at the same time is determined by the time of delay of the reaction of sections of the line to the impact load during the capture of the strip by rolls. The greater the wear, the longer the delay time. The option of determining the state of the nodes of the line by determining the speed of propagation of the shock pulse from the rolling stand to the engine is considered. An example of measuring the reaction delay time of three sections of one of the stands with calculations of the pulse rate in these sections is given. It is shown that with increasing wear, the pulse velocity decreases significantly. Therefore, this speed characterizes the technical condition of the sites, ie has a diagnostic feature. Additionally, the influence of the presence of oil, scale, and contamination in the joints is considered. It is also recommended to use the ratio of the base speed of the shock pulse in the solid shaft to the actual speed in the nodes to determine their technical condition.

scholarly journals Critical Distance of the Seismic Waves’ Impact in Disintegration of Rock Blasting

2019 ◽  
Vol 2019 ◽  
pp. 1-8
Author(s):  
Dušan Kudelas ◽  
Blažej Pandula ◽  
Michal Cehlár ◽  
Marcela Taušová ◽  
Ján Koščo
Keyword(s):  
Critical Point ◽  
Seismic Waves ◽  
Critical Distance ◽  
Rock Blasting ◽  
Significant Difference ◽  
Explosive Charges ◽  
Speed Of Propagation ◽  
The Individual ◽  
The Impact

The presented paper deals with attenuation of seismic waves, which depends on the degree of disintegration of the rock environment in which seismic waves are propagated due to the explosion of explosive charges during blasting operations. Measurements of the impact of seismic waves were conducted to determine the best possible way to absorb these waves. The aim of the article is to identify the existence of a critical distance and the determination of the critical point from which the propagation of the velocity is not dependent on the type of deposit and the environment in which the seismic wave propagates. Statistical methods were used for these findings. The result is the determination of the distance of 80 m in which the speed on the individual deposits varied. From this limit on, there was no significant difference in the speed of propagation on the individual deposits.

Determination of the Fatigue Behavior of Aluminide Coatings by Means of the Impact Testing Method

2007 ◽  
Vol 348-349 ◽  
pp. 645-648
Author(s):  
Kostas David ◽  
K.G. Anthymidis ◽  
P. Agrianidis ◽  
D.N. Tsipas
Keyword(s):  
Fatigue Failure ◽  
Fatigue Resistance ◽  
Failure Modes ◽  
Impact Load ◽  
Fatigue Behavior ◽  
Impact Testing ◽  
Testing Method ◽  
Aluminide Coatings ◽  
The Impact

The impact testing is an efficient experimental method that enables the quantitative and qualitative determination of the fatigue resistance of mono- and multilayer coatings deposited on various substrates, which was not possible with the common testing methods previously available. In this paper the experimental assessment of the fatigue resistance of coatings working under cyclic loading conditions by means of the dynamic impact testing method is presented. The fatigue failure mode, such cohesive or adhesive, of the investigated coatings is determined using scanning electron and optical microscopy, as well as EDX analysis. Critical values of the stress components, responsible for distinctive fatigue failure modes of the coating substrate system are obtained and the fatigue limits of aluminide coatings are illustrated in simple diagrams containing the impact load versus the number of successive impacts that the examined aluminide-P91 system can withstand.

Determination of the Strength Parameters of Pinewood Based on the Non-Destructive Sclerometric Test with a Wood Hammer

2020 ◽  
Vol 30 (1) ◽  
pp. 43-52
Author(s):  
Bartosz Szostak ◽  
Maciej Trochonowicz ◽  
Mateusz Kowalczyk
Keyword(s):  
Compressive Strength ◽  
Nondestructive Testing ◽  
Technical Condition ◽  
Strength Parameters ◽  
The Impact ◽  
Non Destructive ◽  
Structure And Design

AbstractTo assess the technical condition of a structure and design it using existing elements, it is necessary to know its parameters. For existing facilities, it is often not possible to get a sample of material and examine it directly in the laboratory. For this reason, in situ nondestructive testing is very important.The main goal of the paper is to present the issues related to determining the strength parameters of a particular wood based on the non-destructive sclerometric test performed with a wood sclerometric hammer. The study also presents the results of the impact of pinewood density on its compressive strength.

scholarly journals KINEMATIC ANALYSIS OF THE NODE OF INTERMEDIATE GEARS OF DISTRIBUTIVE TYPE FUEL PUMP

2019 ◽  
Vol 14 (1) ◽  
pp. 83-88
Author(s):  
Юрий Доброхотов ◽  
Yuriy Dobrohotov ◽  
Николай Пушкаренко ◽  
Nikolay Pushkarenko ◽  
Айрат Валиев ◽  
...  
Keyword(s):  
Fuel Injection ◽  
Statistical Processing ◽  
Technical Condition ◽  
Injection Angle ◽  
Gear Drive ◽  
Distribution Type ◽  
The Impact ◽  
Statistical Indicators ◽  
Type Fuel

In order to study the significance of the impact of wear on the working surfaces of parts of the intermediate gear assembly on the amount of plunger dead stroke and, therefore, on the cycle feed and advance fuel injection angle, we analyzed the critical positions of the parts of the assembly without the repair of its geometric parameters. In the process, the working surfaces of parts and mates are subject to intensive wear, which leads to an increase in the radial play of the intermediate gear. With the help of the developed device, the intermediate gears of the first and second pump sections of 70 ND-22/6 pumps from among the repair stock were examined at the specialized workshop of OAO “Yantikovskoe RTP”. From an analysis of the results of statistical processing of the backlash values in the nodes under study, it follows that in 75% of pumps the value of the radial play of the intermediate gear exceeds the allowable value for the first pumping section and 72% of the pumps for the second section. The paper proposes a method for determining the radial play of the intermediate gear drive of the plunger rotation drive of the distribution type pump. The design of the device for the in-place determination of the radial play of parts in the nodes of intermediate gears is given. Statistical indicators of the radial play of the intermediate gears of the plunger rotation mechanism were obtained. The percentage of shelf life of distribution type pumps is determined by the parameters of the technical condition of the intermediate gear assemblies. According to the research results, it was proposed to transfer the intermediate gear assemblies of the ND-22/6 pumps to the category of repair kits with their obligatory replacement when replacing pump sections.

scholarly journals RESEARCH AND IMPLEMENTATION OF INTELLIGENT INFORMATION TECHNOLOGY FOR TESTING THE NEURAL NETWORK OF THE DIAGNOSTIC SYSTEM OF TECHNICAL CONDITION OF BUILDINGS

2021 ◽  
pp. 76-83
Author(s):  
Alexander Terentyev ◽  
Yevhenii Gorbatyuk ◽  
Olena Dolya ◽  
Olha Serpinska ◽  
Mariia Liashchenko
Keyword(s):  
Information Technology ◽  
Life Cycle ◽  
Diagnostic System ◽  
Technical Condition ◽  
Automated System ◽  
Building Structures ◽  
Measurement Systems ◽  
Determination Of Parameters ◽  
The Impact

The methodological bases of construction of information system of diagnostics of technical condition of constructions of buildings and constructions and substantiation of efficiency of technologies of instrumental definition of parameters of buildings, constructions at all stages of their life cycle which are considered from a position of strategic information management are offered; carried out, from the standpoint of a systematic approach, the formalization of the processes of wear of building structures, which allows the creation of an effective and reliable analytical apparatus for monitoring the technical condition and diagnosis of future conditions in the process of their reliable and safe operation; built, using the apparatus of fuzzy sets, models and methods of monitoring a certain technical condition of buildings; The information technology of the decision support system, which is based on powerful intellectualizing analytical tools that allow experts to make more plausible assessments and management decisions, has been further developed. Based on the results of studying scientific sources, conclusions were made about the absence or need to deepen the solutions to the following problems: establishing general principles for the formation of a system for diagnosing the technical condition of buildings at all stages of their life cycle; lack of methodology to substantiate the effectiveness of technologies and tools for instrumental determination of parameters of buildings, structures and building areas at all stages of the life cycle; adaptation of methods for determining organizational and technological indicators to calculate the effectiveness of measurement systems and technology of their application; determining the impact of organizational and technical indicators on the efficiency of measurement systems and technology of their application; determination of the duration and periodicity of instrumental inspections as part of the operating costs of measuring systems; establishment of necessary volumes of instrumental observations at operation of buildings and constructions of substantiation of expenses of time for performance of measuring works at all stages of a life cycle of construction objects; lack of a single methodology for creating an automated system for diagnosing the technical condition of buildings; lack of integrated models and methods of modeling diagnostic processes that would ensure the effective functioning of information technology diagnostics of technical condition of buildings and high accuracy of expert decisions on their condition and forecasting the main technical characteristics of their operation under external and internal environments; the lack of a single information database that would make it possible to compare the results of surveys, to observe the dynamics of aging of buildings, to systematize conclusions about their condition.

scholarly journals A Method of Predicting Wear and Damage of Pantograph Sliding Strips Based on Artificial Neural Networks

Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 98
Author(s):  
Małgorzata Kuźnar ◽  
Augustyn Lorenc
Keyword(s):  
Neural Networks ◽  
Artificial Neural Networks ◽  
Current Collector ◽  
Technical Condition ◽  
Training Data ◽  
Training Algorithms ◽  
The Neural Network ◽  
Artificial Neural ◽  
The Impact

The impact of the pantograph of a rail vehicle on the overhead contact line depends on many factors. Among other things, the type of pantograph, i.e., the material of the sliding strip, influences the wear and possible damage to the sliding strip. The possibility of predicting pantograph failures may make it possible to reduce the number of these kinds of failures. This article presents a method for predicting the technical state of the pantograph by using artificial neural networks. The presented method enables the prediction of the wear and damage of the pantograph, with particular emphasis on carbon sliding strips. The paper compares 12 predictive models based on regression algorithms, where different training algorithms and activation functions were used. Two different types of training data were also used. Such a distinction made it possible to determine the optimal structure of the input and output data teaching the neural network, as well as the determination of the best structure and parameters of the model enabling the prediction of the technical condition of the current collector.

scholarly journals Bridges maintainability evaluation peculiarities as part of hydraulic structures

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Boris Bondarev ◽  
Vladimir Erofeev ◽  
Alexandr Bondarev ◽  
Anastasia Korneeva ◽  
Mihail Gavrilov ◽  
...  
Keyword(s):  
Concrete Strength ◽  
Technical Condition ◽  
Hydraulic Structures ◽  
Actual State ◽  
Final Report ◽  
Shock Pulse ◽  
Structural Elements ◽  
Monitoring Method ◽  
Elastic Rebound

Introduction: the article is dedicated to assessing the condition with respect to use for traffic methods of bridges as part of hydraulic structures (dams, hydroelectric power stations, locks). The main factors affecting the structural element’s durability included in the composition of the hydraulic structures are dynamic loads (applied repeatedly and repeated) affecting the bay due to the hydrodynamic effect; temporary, moving loads from passing highway transportation, along the top of the structure (along the roadway); harmful chemical impurities contained in the water passing through the structure. Under the influence of the above-mentioned factors, defects and damage occur in the hydraulic facilities’ structural elements. Methods: the authors assessed the actual state of the material of the operating structure. To assess structures and materials actual state during the bridge structure inspection work, the following instrumental measurements were performed on as-built structural elements: leveling the top of the sidewalks and the roadway; materials strength determination of the main supporting structures by nondestructive methods; thickness measuring the asphalt concrete pavement of the roadway; determination of the degree of carbonation of concrete; identification of defects in the elements of the bridge. The actual structure’s concrete strength was determined by nondestructive testing methods: (1) by the method of the elastic rebound; (2) by the shock pulse monitoring method; (3) an indirect method of concrete strength ultrasonic testing based on the revealed relationship between the method of separation with shear test and methods – shock pulse and elastic rebound. Results: technical condition and bridge safety indicators calculation as a hydraulic structure element was executed. Discussion: technical examination results of the bridge structural elements and instrumental studies confirm the conclusion about the repair measures need with high-strength concretes and protective coatings based on polymer composite materials. Final report: following the emergency scenarios a numerical estimate table for the quantitative and qualitative parameters list was made, parameters corresponding to a particular structure state. Thus, according to the scenario related to the 3rd accident group, the bridge technical condition is assessed as limited operable, and the safety level is reduced.

Investigation of atmospheric corrosion with use of permanent corrosion stations

2012 ◽  
Vol 30 (1) ◽  
pp. 25-44 ◽  
Author(s):  
Piotr Barszcz
Keyword(s):  
Atmospheric Corrosion ◽  
Field Tests ◽  
Research Process ◽  
Technical Condition ◽  
Corrosion Process ◽  
Corrosion Products ◽  
Physical Parameters ◽  
Atmospheric Conditions ◽  
The Impact

Field tests of atmospheric corrosion [7, 14, 15] are understood as investigation that are carried out in the Earth atmosphere at the ambient temperature in order to determine corrosion resistance of metals and pollution of environment by corrosion products, efficiency of corrosion protection or corrosion aggressiveness of environment [9, 11]. The investigation dedicated to prolongation of the technical service time of aircrafts as well implementation of their operation according to their actual technical condition are closely connected to investigation of corrosion processes under natural atmospheric conditions where specimens of materials are exposed to the impact of ambient factors and periodically subjected to tests that assume visual inspection, scheduled determination of weight and volume loss due to corrosion, appearance of specimens and alteration of their physical parameters [4]. Investigation results are obtained as measurements of weight and thickness of corroded specimens, photographs of specimen surfaces after withdrawing them back from the corrosion stations and removing corrosion products. On the basis of information acquired from investigations on corrosion it is possible to calculate parameters that are specific for the corrosion process that takes place within the region where a permanent corrosion station is located. The calculated parameters have been sourced from standards that are effective in Poland and worldwide [5, 6, 8, 10] but own specifications have also been developed based on the gained experience (Table 3). The research process involves also monitoring of atmospheric conditions that exist on the area where corrosion specimens are exposed [4]. Information related to atmospheric conditions is sourced from the Hydrometeorological Centre of Polish Army along with information that is published on the Internet by the Inspectorate of Environmental Protection. These information that reflect the atmospheric conditions make it possible to seek for the correlation between the parameters that are specific for the corrosion process and meteorological conditions.

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