Program complex for estimation steadiness of mechanized support unit during movement on incline coal seams

V Zenzerov;  ; A Grebyonkina;

doi:10.15407/mining07.02.183

Analytical and Mining Experimental Studies about the Character of Interaction on the Mechanized Supports of ZQY3600/12/28 at the Quang Hanh Mine in the Quang Ninh Coal Basin

E3S Web of Conferences ◽

10.1051/e3sconf/20184101036 ◽

2018 ◽

Vol 41 ◽

pp. 01036

Author(s):

Thang Duc ◽

Huynh Ngoc

Keyword(s):

3D Model ◽

Experimental Studies ◽

Coal Seams ◽

Coal Basin ◽

Mechanized Support ◽

Deformation State ◽

Mining Works ◽

Roof Rocks ◽

Working Out ◽

Quang Ninh

Complex studies using measuring stations for working out inclined coal seams of medium thick with the use of longwall, combining in a certain extracting area of mining works and instruments for measuring the bearing rock pressure and the displacement of the roof rocks adjacent to the longwall. The parameters of stress intensity distribution were placed during the working out of the extracting area. Installation of reaction dynamics mechanized support along the strike of extracting area. Suggestion 3D-model shows stress-deformation state of the rock massif in all of extracting area.

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Mental health care in a Fleet Mental Health Support Unit.

PsycEXTRA Dataset ◽

10.1037/e475952004-001 ◽

1982 ◽

Author(s):

R. Blake Chaffee ◽

Ralph E. Bally

Keyword(s):

Mental Health ◽

Health Care ◽

Mental Health Care ◽

Support Unit ◽

Mental Health Support ◽

Health Support

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Study of the process of forming a hole for a thread at manufacturing a high nut

Ferrous Metallurgy Bulletin of Scientific Technical and Economic Information ◽

10.32339/0135-5910-2020-8-841-846 ◽

2020 ◽

Vol 76 (8) ◽

pp. 841-846

Author(s):

I. G. Shubin ◽

A. A. Kurkin

Keyword(s):

Metal Flow ◽

Nonlinear Dependence ◽

Geometrical Parameters ◽

Relative Height ◽

Forming Process ◽

Normal Height ◽

Accuracy Class ◽

Limit Values ◽

Program Complex ◽

Class B

During manufacturing nuts of increased height, a problem of obtaining correct cylindrical form of the hole for thread and overall geometrical parameters arises. To solve the problem it is necessary to know regularity of the blank forming process. Results of the study of a technological process of high hexahedral nuts forming presented. The nuts were M18 of 22 mm height, M16 of 19 mm height and M12 of normal height 10 mm according to GOST 5915–70, accuracy class B, steel grade 10 according to GOST 10702–78. The volumetric stamping was accomplished at the five-position automatic presses of АА1822 type. It was determined, that unevenness of the metal flow in the process of plastic deformation of blanks of increased height nuts was caused by different stress conditions by their sections. To simulate the mode of deformation, the program complex QForm-3D was chosen. The complex ensured to forecast with necessary accuracy the metal flow in a blank, as well as to define the deformation force and arising stress in the working instrument. The simulation showed the presence of regularity between preliminary formed buffle and deviation of dimensions and form of a blank wall after its finishing piercing, which can be expressed by a nonlinear dependence. The limit values of the relative height of the buffle С/D = 0.56–0.588 defined, exceeding which will result in rejection of the finished product. Accounting the limit values of the relative height of the buffle will enable to correct a mode of technological operations and technological instruments at stamping of high hexahedral nuts.

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OPERATIONAL STATE OF BRIDGES OF UKRAINE

Avtoshliakhovyk Ukrayiny ◽

10.33868/0365-8392-2019-2-258-57-68 ◽

2019 ◽

pp. 57-68

Author(s):

Larysa Bodnar ◽

Petro Koval ◽

Sergii Stepanov ◽

Liudmyla Panibratets

Keyword(s):

Management System ◽

The State ◽

Operating Conditions ◽

Bridge Management ◽

Bridge Management System ◽

Program Complex ◽

Operating Condition ◽

Software Complex ◽

Automatic Mode ◽

The Status

A significant part of Ukrainian bridges on public roads is operated for more than 30 years (94 %). At the same time, the traffic volume and the weight of vehicles has increased significantly. Insufficient level of bridges maintenance funding leads to the deterioration of their technical state. The ways to ensure reliable and safe operation of bridges are considered. The procedure for determining the predicted operational status of the elements and the bridge in general, which has a scientific novelty, is proposed. In the software complex, Analytical Expert Bridges Management System (AESUM), is a function that allows tracking the changes in the operational status of bridges both in Ukraine and in each region separately. The given algorithm of the procedure for determining the predicted state of the bridge using a degradation model is described using the Nassie-Schneidermann diagram. The model of the degradation of the bridge performance which is adopted in Ukraine as a normative one, and the algorithm for its adaptation to the AESUM program complex with the function to ensure the probabilistic predicted operating condition of the bridges in the automatic mode is presented. This makes it possible, even in case of unsatisfactory performance of surveys, to have the predicted lifetime of bridges at the required time. For each bridge element it is possible to determine the residual time of operation that will allow predict the state of the elements of the structure for a certain period of time in the future. Significant interest for specialists calls for the approaches to the development of orientated perspective plans for bridge inspection and monitoring of changes in the operational status of bridges for 2009-2018 in Ukraine. For the analysis of the state of the bridge economy, the information is available on the distribution of bridges by operating state related to the administrative significance of roads, by road categories and by materials of the structures. Determining the operating state of the bridge is an important condition for making the qualified decisions as regards its maintenance. The Analytical Expert Bridges Management System (AESUM) which is implemented in Ukraine, stores the data on the monitoring the status of bridges and performs the necessary procedures to maintain them in a reliable and safe operating condition. An important result of the work is the ability to determine the distribution of bridges on the public roads of Ukraine, according to operating conditions established in the program complex of AESUM, which is presented in accordance with the data of the current year. In conditions of limited funding and in case of unsatisfactory performance of surveys, it is possible to make the reasonable management decisions regarding the repair and the reconstruction of bridges. Keywords: bridge management system, operating condition, predicted operating condition, model of degradation, bridge survey plan, highway bridge.

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