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Journal articles on the topic 'Stand-by operation'

Author: Grafiati

Published: 30 June 2021

Last updated: 29 July 2025

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1

Dal, Mehmet, and Ralph M. Kennel. "A Dynamic Modeling Approach: Simplifying DFIG Theory, Simulation, and Analysis." Energies 18, no. 2 (2025): 282. https://doi.org/10.3390/en18020282.

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The operation and modelling of doubly fed induction generators (DFIGs) are quite different in grid-connected and stand-alone operated wind energy conversion systems (WECSs). Researchers usually simulate DFIGs in these operations using the pre-built models provided in commercial software, which are built using complex modeling techniques that most researchers in the field are unfamiliar with. In this paper, a simple and easy-to-use modeling approach based on the basic dynamic voltage equations of an induction machine (IM) is proposed to provide a more physical and practical understanding of the

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Brazeau, Randi H., and Marc A. Edwards. "OPTIMIZATION OF ELECTRIC HOT WATER RECIRCULATION SYSTEMS FOR COMFORT, ENERGY AND PUBLIC HEALTH." Journal of Green Building 8, no. 2 (2013): 73–89. http://dx.doi.org/10.3992/jgb.8.2.73.

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Hot water recirculation systems (RECIRC) are labeled green and are sometimes mandated in local plumbing codes. Previous work conducted under non-optimized operation schemes demonstrated that these systems actually waste energy and water versus standard (STAND) water heater counterparts. Optimization of RECIRC system operation by minimizing pump operation did improve energy efficiency 6–60%, saving consumers 5–140% annually in associated utility costs. However, STAND systems were still more energy efficient than any of the RECIRC systems. With respect to factors that might influence pathogen gr

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Yamashita, Takahiro, Tetsuya Fujimoto, and Koichiro Ishibashi. "Power Valve: for low power operation and low stand-by power." IEICE Electronics Express 2, no. 3 (2005): 64–69. http://dx.doi.org/10.1587/elex.2.64.

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Ouyang, Jie, Changqing Zhu, Xiaowei Tang, and Jian Zhang. "Multi-Stand Grouped Operations Method in Airport Bay Area Based on Deep Reinforcement Learning." Aerospace 12, no. 5 (2025): 398. https://doi.org/10.3390/aerospace12050398.

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To address the trade-off between safety levels and operational efficiency in the Bay Area, this study proposes a Multi-Stand Grouped Operations method based on deep reinforcement learning under the consideration of the safety domain. The full-process operation of aircraft within the Bay Area is analyzed to identify key operational spots. Safety domains are then established based on path conflicts arising from aircraft movements and safety conflicts caused by minimum separation distances and wake vortex effects. These domains are used to define corresponding safe operating spaces and construct

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Mikhasek, Andrey, Maxim Rodionov, Nikolay Malyugin, and Artem Klimov. "Stand-by spillways in phreatic dams." MATEC Web of Conferences 196 (2018): 02008. http://dx.doi.org/10.1051/matecconf/201819602008.

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Hydraulic structures operation is always connected with accident risks. The authors analyzed emergency situations which affected dams located on the territory of the USA and Russia. This analysis showed that the most dangerous accident which took place at hydroelectric complexes is an overfall through the crest of the dam accompanied with the formation of washouts and blow-out waves. The most striking example here is the accident at St. Francis dam. According to most researchers, its main cause was the human factor. To reduce economic losses which are due to an accident on the hydro-technical

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Rachmanov, S. R., S. V. Belodedenko, V. V. Povorotnii, and V. T. Vyshinskii. "Estimation of reliability of the TPA 350 mill working stand housing after a long operation." Ferrous Metallurgy. Bulletin of Scientific , Technical and Economic Information 76, no. 1 (2020): 59–67. http://dx.doi.org/10.32339/0135-5910-2020-1-59-67.

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Among the processes, taking place at the shells rolling at automatic mill, the least studied are a working stand housing behavior, which becomes apparent in the form of its dynamic shifting. It can be explained by the fact, that the shell interacting with the rollers and the mandrel is effected by rod mechanism of the mandrel holding at the rolling axis. The possibility of the non-controlled deformed state can be explained also by deviation from the regulation state of anchor bolts fastening system and various defects in the stand housing. It made a foundation to accomplish monitoring of the s

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Kędzierski, Piotr, Tadeusz Niezgoda, and Grzegorz Sławiński. "Development of Stand for Rock Material Fracturing in Laboratory Conditions." Solid State Phenomena 240 (August 2015): 94–97. http://dx.doi.org/10.4028/www.scientific.net/ssp.240.94.

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The paper presents a description of the stand for rock material fracturing in laboratory conditions. Requirements to be met by fracturing stands were formulated. Proper operation of the test stand was verified by marble sample fracturing. Many of technical details of the developed stand were given, which may be useful for readers designing their own stands.

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Wróbel, Nikodem, Michał Rejek, and Grzegorz Królczyk. "Testing of beveled crimp connections made on a prototype stand." Archives of Mechanical Technology and Materials 38, no. 1 (2018): 15–22. http://dx.doi.org/10.2478/amtm-2018-0003.

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Abstract The purpose of this study is to form and test inseparable tight joints, commonly used in the construction of heat exchangers, by crimping operation on designed prototype stand. Crimped joints are made by tools in form of cones with two types of shapes, each of the designed tools have got identical forming angle. This study uses two types of connecting blocks and plates, differing in diameters of hole and flange. Elaboration contains a case study of joints being made by the stand, which in addition to the crimping operations for some cases were glued or brazed. The article presents the

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DROŹDZIEL, Paweł, and Paweł KORDOS. "PROPOSITION OF NEW SINGLE TEST CYCLE OF INTERNAL COMBUSTION ENGINE DURING STAND RELIABILITY TESTS." Scientific Journal of the Military University of Land Forces 159, no. 1 (2011): 50–57. http://dx.doi.org/10.5604/01.3001.0002.2860.

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A test-stand reliability evaluation of automotive internal combustion engines is carried out so as to determine the selected reliability parameters, such as an average occurrence of defects, an average frequency of part exchange, an average frequency of engine regulation or the wear of selected engine components. The values of these indicators make it possible to estimate the durability of components used as well as of the whole structure of the engine. During reliability test-stand research, the engine is run according to multiple repeated cycles of operation. The conditions of engine operati

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Lyashuk, Oleg, Ruslan Zaverukha, Yuriy Pyndus, Yuriy Vovk, and Alexander Pyndus. "Experimental and analytical study of petrol engine electromagnetic injectors control system." Scientific journal of the Ternopil national technical university 100, no. 4 (2020): 97–105. http://dx.doi.org/10.33108/visnyk_tntu2020.04.097.

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A laboratory stand for the study and diagnostics of the fuel supply system functional elements and for the education process efficiency improvement of laboratory research has been developed. The laboratory stand design is an illustrative one and can be used for the general assessment of the ICE selected control system quality. The assessment of parameters characterizing the fuel injection efficiency by separate injectors of the engine in several operation modes has been made using the stand under discussion. The experimental research has been conducted and main characteristics of the fuel supp

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Ivanovа, V. R., and L. V. Fetisov. "DEVELOPMENT OF TRAINING BENCH FOR EFFECTIVE AND SAFE OPERATION OF BACKUP POWER AT INDUSTRIAL ENTERPRISES." Proceedings of the higher educational institutions. ENERGY SECTOR PROBLEMS 20, no. 9-10 (2019): 120–28. http://dx.doi.org/10.30724/1998-9903-2018-20-9-10-120-128.

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The paper suggests the description and development of the demonstration stand «Automatic switch of stand-by power supply" for possibility of visual study and understanding of the multi-purpose power supply to ensure the reliability of electricity supply to consumers.

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Huang, S. C., J. Y. Yeh, C. T. Chen, and J. C. Chen. "STUDY ON THE EXPLAINABLE ABILITY BY USING AIRBORNE LIDAR IN STAND VALUE AND STAND COMPETITION." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B1 (June 2, 2016): 19–23. http://dx.doi.org/10.5194/isprs-archives-xli-b1-19-2016.

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Forest canopy structure is composed by the various species. Sun light is a main factor to affect the crown structures after tree competition. However, thinning operation is an appropriate way to control canopy density, which can adjust the competition conditions in the different crown structures. Recently, Airborne Light Detection and Ranging (LiDAR), has been established as a standard technology for high precision three dimensional forest data acquisition; it could get stand characteristics with three-dimensional information that had develop potential for the structure characteristics of fore

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Belov, Igor, Maksim Vabischevich, Oleg Dedov, and Olga Krivenko. "TESTING OF EXPERIMENTAL SAMPLES OF PROFILED DECKING BY AN EXPERIMENTAL STAND." Management of Development of Complex Systems, no. 49 (April 11, 2022): 52–58. http://dx.doi.org/10.32347/2412-9933.2022.49.52-58.

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Testing building structures and their elements is a mandatory step in their development. This will prevent possible dangers to people during its operation and provide a positive image of the manufacturing company. Each design parameter is subject to testing. The test results are conclusions and recommendations, confirmed by the state certificate of Ukraine on the compliance of each of the studied parameters and the whole design with it. Experimental methods for studying the operation of any structure play an important role not only for assessing the stability and strength of a structure, but a

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Huang, S. C., J. Y. Yeh, C. T. Chen, and J. C. Chen. "STUDY ON THE EXPLAINABLE ABILITY BY USING AIRBORNE LIDAR IN STAND VALUE AND STAND COMPETITION." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B1 (June 2, 2016): 19–23. http://dx.doi.org/10.5194/isprsarchives-xli-b1-19-2016.

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Forest canopy structure is composed by the various species. Sun light is a main factor to affect the crown structures after tree competition. However, thinning operation is an appropriate way to control canopy density, which can adjust the competition conditions in the different crown structures. Recently, Airborne Light Detection and Ranging (LiDAR), has been established as a standard technology for high precision three dimensional forest data acquisition; it could get stand characteristics with three-dimensional information that had develop potential for the structure characteristics of fore

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15

Shabovta, Mykhailo, Oleksandr Besarab, and Valerii Plis. "Development of the Experimental Stand for Studying and Testing Digital Protection Terminals." Problems of the Regional Energetics, no. 1(57) (February 2023): 17–27. http://dx.doi.org/10.52254/1857-0070.2023.1-57.02.

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However, the approach to designing laboratory stands for training students and electrical personnel on the specifics of using digital protections in most cases has remained the same, which does not allow for fully realizing their potential. The purpose of the work is to improve the quality of the knowledge and practical skills received by students in the work with digital protection blocks. To achieve the goal, a specialized laboratory stand for testing digital security terminals has been developed. The stand consists of a mathematical model of the protected object, implemented in the form of

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Diniz, Carlos Cezar Cavassin, Felipe Martins de Oliveira, Romano Timofeiczyk Junior, Renato Cesar Gonçalves Robert, Miguel Pesch Tramontini, and Fabio Cordeiro de Brito. "DAMAGE CAUSED BY A WHEELED HARVESTER TO THE RESIDUAL TREES OF A PINUS STAND IN THE FIRST MECHANIZED MIXED THINNING." FLORESTA 50, no. 3 (2020): 1547. http://dx.doi.org/10.5380/rf.v50i3.64331.

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The objective of this study was to evaluate the damage caused to the remaining trees of a pinus stand submitted to mechanized thinning by a wheeled harvester. The data were obtained in the operational areas of timber harvesting in a forest company located in the city of Inácio Martins, in the state of Paraná, Brazil. The Pinus stand of the study was 11 years old, and was submitted to the first commercial thinning. The operation was performed by a harvester, characterized by the systematic removal of the 5th planting line to give access to the interior of the stand, followed by selective thinni

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Shirokov, A. D., D. A. Feoktistov, T. G. Оreshenko, M. S. Fedorov, and A. V. Chubar. "Automation of low-thrust engine testing." Spacecrafts & Technologies 7, no. 1 (2023): 44–50. http://dx.doi.org/10.26732/j.st.2023.1.05.

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The article discusses the key role of the use of automation in the stands, as well as the ignition system of the stand of low-thrust engines and the features of its operation as part of the stand. The ignition system scheme was developed, assembled and worked out, on the basis of which the ignition of the components of the propulsion system mixture will be carried out. The ignition system was tested by directly connecting the power supply to the circuit, which during the tests showed its suitability for use due to the long and continuous operation of the system. The power was turned on by cont

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18

Lee, Ha-Lim, and Yeong-Han Chun. "Using Piecewise Linearization Method to PCS Input/Output-Efficiency Curve for a Stand-Alone Microgrid Unit Commitment." Energies 11, no. 9 (2018): 2468. http://dx.doi.org/10.3390/en11092468.

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When operating a stand-alone micro grid, the battery energy storage system (BESS) and a diesel generator are key components needed in order to maintain demand-supply balance. Using Unit Commitment (UC) to calculate the optimal operation schedule of a BESS and diesel generator helps minimize the operation cost of the micro grid. While calculating the optimal operation schedule for the microgrid, it is important that it reflects the actual characteristics of the implanted devices, in order to increase the schedule result accuracy. In this paper, a piecewise linearization, on the actual power con

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Ursúa, Alfredo, Idoia San Martín, Ernesto L. Barrios, and Pablo Sanchis. "Stand-alone operation of an alkaline water electrolyser fed by wind and photovoltaic systems." International Journal of Hydrogen Energy 38, no. 35 (2013): 14952–67. http://dx.doi.org/10.1016/j.ijhydene.2013.09.085.

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20

Ma, Minhai, and Lei Yong. "Design of Active Display Stand Combing the Pressure Sensor and Kinematics Algorithm." Journal of Sensors 2022 (July 23, 2022): 1–8. http://dx.doi.org/10.1155/2022/9275062.

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To solve the trouble of cervical vertebra disease caused by long working hours, this work is aimed at designing an active monitor stand to achieve the best dynamic trajectory planning. The stand operation system consists of image input, face positioning, and robotic arm. According to the user’s face positioning, the inverse kinematics method is used to calculate the steering angle in each direction, and the height and angle are adjusted to make the corresponding selection for the user’s display position on the screen. The C++ is used to program the algorithm, and its core is to control the rot

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Jagtap, Roshan, Tejas Yadav, and Abhishek Kadam. "Smart Electric Dashboard for 2-Wheeler." International Journal for Research in Applied Science and Engineering Technology 12, no. 10 (2024): 386–91. http://dx.doi.org/10.22214/ijraset.2024.64452.

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Abstract: This paper aims to enhance the efficiency of manual actuation and automation for sliding of side-stand to increase the safety of the rider. In the modern developing world, automobile plays an important role especially two-wheeler i.e. (motorcycles& bikes) plays a major role. The purpose of the Automatic Side Stand Slider project is to design, develop, and implement an automated system for deploying and retracting the side stand of a motorcycle. The project aims to enhance safety, convenience, and stability for motorcycle riders by automating the side stand operation based on pred

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Sznajder, Joanna. "The Analysis of the Digital AC Motor Speed Control System Operation." Zeszyty Naukowe Akademii Marynarki Wojennej 212, no. 1 (2018): 125–36. http://dx.doi.org/10.2478/sjpna-2018-0007.

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Abstract The article presents the analysis of the automatic alternate current motor control system, carried out by the author. The automatic control system has been implemented on the existing laboratory stand, containing: the squirrel-cage asynchronous motor and the frequency inverter. The existing stand imposed one of the available speed control methods for the motor and the necessity of the appropriate elements selection for the automatic control system [1]. The automatic control system has been designed and created as the constant value follow-up digital controller. To designate the parame

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Feitosa, Jardênia R., Haroldo C. Fernandes, Paulo R. Cecon, Daniel M. Leite, Filipe M. T. Nery, and Janielle S. Pereira. "Onion yield as a function of soil tillage system and soil water content." Revista Brasileira de Engenharia Agrícola e Ambiental 24, no. 2 (2020): 115–20. http://dx.doi.org/10.1590/1807-1929/agriambi.v24n2p115-120.

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ABSTRACT Excessive tillage operations under inadequate conditions can raise the cost of agricultural production and lead to soil degradation without adequate crop response. The objective of this study was to evaluate the onion crop response to soil water contents and tillage systems. Three tillage systems were evaluated: P1 (plowing + two harrowings + two seedbed raising operations), P2 (two harrowings + one seedbed raising operation), P3 (one harrowing + one seedbed raising operation); and four soil water contents: 12, 15, 23 and 26%. The experiment was conducted in the irrigated perimeter of

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AF, Salnikov, Bochkarev SV, and Zubko IA. "Experimental and theoretical studies of the influence of the bench elements on the transient operation of the turbine." Annals of Mathematics and Physics 6, no. 1 (2023): 029–35. http://dx.doi.org/10.17352/amp.000073.

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The energy parameters obtained during the tests of turbines of power units on the stand differ from those in the product. The research data, which results are presented in the materials of the paper, are aimed at analyzing the discrepancies between the parametric indicators of power units and bench tests of the turbines. The novelty of the obtained results reveals the direct and inverse relationship of changes in the amplitude-frequency characteristics of the elements of the stand (depending on the realized turbine power) with the obtained results of measuring the turbine power on the stand. W

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Noroozian, Reza, Gevorg Gharehpetian, Mehrdad Abedi, and Mishel Mahmoodi. "Grid-Tied and Stand-Alone Operation of Distributed Generation Modules Aggregated by Cascaded Boost Converters." Journal of Power Electronics 10, no. 1 (2010): 97–105. http://dx.doi.org/10.6113/jpe.2010.10.1.097.

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Dufo-López, Rodolfo, L. Alfredo Fernández-Jiménez, Ignacio J. Ramírez-Rosado, J. Sergio Artal-Sevil, José A. Domínguez-Navarro, and José L. Bernal-Agustín. "Daily operation optimisation of hybrid stand-alone system by model predictive control considering ageing model." Energy Conversion and Management 134 (February 2017): 167–77. http://dx.doi.org/10.1016/j.enconman.2016.12.036.

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Kreimer, Joseph, and Abraham Mehrez. "An optimal operation policy for real-time n-server stand-by systems involving preventive maintenance." European Journal of Operational Research 69, no. 1 (1993): 50–54. http://dx.doi.org/10.1016/0377-2217(93)90089-6.

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Tavankar, Farzam, Rodolfo Picchio, Rachele Venanzi, Francesco Latterini, and Mehrdad Nikooy. "Restoring Soil Features and Biodiversity Indicators in Managed Forests to the Levels of Protected Forests: After One Silvicultural Rotation Period." Forests 16, no. 2 (2025): 274. https://doi.org/10.3390/f16020274.

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This study examines the provision of ecosystem services in natural mixed broadleaf forests located in the Hyrcanian region of Iran. These services include habitat conservation, soil preservation, timber production, and carbon storage (C-stock). The forests are managed under three different silvicultural methods: shelterwood, selection cutting, and protection, allowing for a comparative analysis of their impact on these critical services. The time since the last cutting operation varied among the forest stands. In the shelterwood stand, 25 years had passed since the previous operation, while in

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Siddharth, S. Chavan Digvijay K. Chandel Sanket M. Dafal Pratik B. Gawade Prof. Vishvajeet C. Shinde. "Electronic Operated Moped Main Stand." International Journal of Advanced Innovative Technology in Engineering 9, no. 3 (2024): 191–94. https://doi.org/10.5281/zenodo.12608394.

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This paper presents the design and development of an automatic bike stand utilizing a linear actuator integrated with a throttle switch mechanism. The proposed system aims to enhance convenience and safety for motorcycle riders by providing an automated stand deployment feature. The design incorporates a linear actuator controlled by a throttle switch, enabling riders to activate the stand with a simple throttle gesture, eliminating the need for manual operation. Through iterative prototyping and testing, the system ensures robust performance and compatibility with various motorcycle models. T

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Song, Seungjeong, Minseok S. Kim, Jaeyeon Lee, and Sungyoung Choi. "A continuous-flow microfluidic syringe filter for size-based cell sorting." Lab on a Chip 15, no. 5 (2015): 1250–54. http://dx.doi.org/10.1039/c4lc01417k.

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Rédei, Károly, Zsolt Keserű, Imre Csiha, János Rásó, Csaba Kovács, and Borbála Antal. "Tending operation model for red oak stands." Acta Agraria Debreceniensis, no. 72 (May 16, 2017): 133–36. http://dx.doi.org/10.34101/actaagrar/72/1604.

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Red oak (Quercus rubra L.) is our most important exotic oak species, that possesses growing culture with almost one hundred years in our country. Plantation character of red oak growing predominates principally by applied regeneration method (mostly artificial), regular planting space, applying defined method and planting space regulation system. Forest tending model for red oak, that considered stopgap in the native literature is intended to serving the latter. Especially important equation in the viewpoint of stand growing, that describes relationship of stem number (N, in hectare) and diame

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Schweier, Janine, and Christian Ludowicy. "Comparison of A Cable-Based and a Ground-Based System in Flat and Soil-Sensitive Area: A Case Study from Southern Baden in Germany." Forests 11, no. 6 (2020): 611. http://dx.doi.org/10.3390/f11060611.

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The results of this study showed that the application of cable-based systems in flat terrain must not necessarily be more cost intensive than its application in other terrains. In recent years, criteria other than purely economic ones have been taken into account in forest management decisions, with the aim of avoiding ecosystem damage and promoting better ecosystem services. Since precipitation in winter is becoming more intensive and weeks with frozen soils are becoming rare, one option might be the use of cable-based instead of ground-based extraction systems. Both vary in terms of economy

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Doubrava, Karel, and Jiří Kuželka. "Turbine Blade Loading and Experimental Verification." Applied Mechanics and Materials 486 (December 2013): 273–76. http://dx.doi.org/10.4028/www.scientific.net/amm.486.273.

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The paper describes process of verification of FEM model of turbine rotor blade fatigue tests. Design of new turbine blade is tested on experimental stand, where load situation is similar to load of rotor blade of steam turbine during operation. Real load of blade and boundary condition on experimental stand was monitored by means of strain gauges set. Experimental data were compared with the computed results of several FEM models.

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Żyluk, Andrzej, Krzysztof Cur, Justyna Tomaszewska, and Tomasz Czerwiński. "Analysis of Aircraft Operation System Regarding Readiness—Case Study." Aerospace 9, no. 1 (2021): 14. http://dx.doi.org/10.3390/aerospace9010014.

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The aim of the study was to develop a model of the readiness and reliability of an aircraft to perform an air task. The applied research method uses quantitative statistical methods and Markov processes in order to create a mathematical algorithm to exploit a selected aircraft type. The paper presents a case study of the TS-11 “Iskra” aircraft. The results show that even if the probability of being on stand-by is low, the tasks can be completed by operating the entire fleet properly.

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Waterford, Stephen D., and Niv Ad. "Surgery for Cardiac Arrhythmias: Past, Present, Future." Rambam Maimonides Medical Journal 15, no. 1 (2024): e0002. http://dx.doi.org/10.5041/rmmj.10516.

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There is a rich history of surgery for cardiac arrhythmias, spanning from atrial fibrillation and Wolff–Parkinson–White syndrome to inappropriate sinus tachycardia and ventricular tachycardia. This review describes the history of these operations, their evolution over time, and the current state of practice. We devote considerable time to the discussion of atrial fibrillation, the most common cardiac arrhythmia addressed by surgeons. We discuss ablation of atrial fibrillation as a stand-alone operation and as a concomitant operation performed at the time of cardiac surgery. We also discuss the

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Matsumoto, Ken. "A Guide to Response Evaluation for Oil Spill Combat in Japan." International Oil Spill Conference Proceedings 1991, no. 1 (1991): 87–91. http://dx.doi.org/10.7901/2169-3358-1991-1-87.

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ABSTRACT There are many ways to evaluate the overall performance of an oil spill response operation. There is, or there should be, however, a common standpoint for looking at such operations, irrespective of the size of the spill. Lessons learned through an incident, however trivial, can provide valuable clues to the future improvement of the operation in refineries and oil terminals. But the number of incidents at one location is too few to stand the test of analysis. Evaluation by a variety of methods is now possible based on information and data available through the worldwide news and repo

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Tărăbîc, Cornel Mihai, Grigore Cican, Cristian Olariu, Gabriel Dediu, and Răzvan Marius Catană. "Test Stand for Microjet Engine Prototypes." Machines 12, no. 10 (2024): 688. http://dx.doi.org/10.3390/machines12100688.

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To investigate the functionality and performance of a prototype microjet engine, we constructed a versatile test stand tailored to the specifications of a 400 N prototype. This test stand facilitated a comprehensive study by enabling real-time recording of 45 essential parameters for analysis, encompassing temperatures, pressures, speed, fuel flow, thrust, vibration, and various other monitored metrics. All parameters and control elements were seamlessly integrated via a data acquisition and control system, utilizing a compactDAQ (Data Acquisition) system from National Instruments and a custom

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Szurgacz, Dawid. "Analysis characteristics determination of electrohydraulic control system operation to reduce the operation time of a powered roof support." E3S Web of Conferences 29 (2018): 00007. http://dx.doi.org/10.1051/e3sconf/20182900007.

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The article discusses basic functions of a powered roof support in a longwall unit. The support function is to provide safety by protecting mine workings against uncontrolled falling of rocks. The subject of the research includes the measures to shorten the time of roof support shifting. The roof support is adapted to transfer, in hazard conditions of rock mass tremors, dynamic loads caused by mining exploitation. The article presents preliminary research results on the time reduction of the unit advance to increase the extraction process and thus reduce operating costs. Conducted stand tests

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Prokopovich, V. V., G. A. Podshivalov, L. A. Martynova, I. V. Pashkevich, and V. S. Bykova. "Assessment of motion safety of a large autonomous underwater vehicle." Podvodnye issledovaniia i robototehnika, no. 1 (March 29, 2024): 86–95. http://dx.doi.org/10.37102/1992-4429_2024_47_01_07.

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The problems of ensuring the safe motion of a large autonomous underwater vehicle (AUV) when it passes through sections with different environmental conditions are considered by the example of the development of the Northern Sea Route. An analysis was made of the influence of various environmental conditions - open and coastal water, fast ice and ice conditions - on the safety of the operation of a large AUV. An approach is proposed to assess the vehicle safety in various environments using a dynamic Bayesian network and conditional probability tables. To test the algorithms for controlling th

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Tavankar, F., B. Majnounian, and A. E. Bonyad. "Felling and skidding damage to residual trees following selection cutting in Caspian forests of Iran." Journal of Forest Science 59, No. 5 (2013): 196–203. http://dx.doi.org/10.17221/53/2012-jfs.

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The felling and skidding damage to residual trees was investigated in a selectively cutting operation in the Caspian forest of Iran. The logging operation was performed by chainsaw and cable skidder. Prelogging, after felling and skidding operations residual tree injuries (species, DBH and damage) were inventoried by systematic plot sampling. Two types of tree damage were observed: destroyed and injured. In this study felling operations mainly injured trees whereas skidding was the main cause of destruction. The percentage of destroyed and injured residual trees by felling operations was 1.4%

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Verbovskyi, Orest, Ihor Popadyuk, Vadym Orel, and Vitalii Makarchuk. "Experimental test-bed for test of pumps with frequency regulation." Problems of Water supply, Sewerage and Hydraulic, no. 44 (October 4, 2023): 11–18. http://dx.doi.org/10.32347/2524-0021.2023.44.11-18.

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A literature review was conducted to develop an experimental stand for testing pumps. It was established that frequency regulation is one of the quantitative energy-saving methods of controlling the operation of the pumping unit. At the same time, the influence on the pump unit is carried out by changing the operating point by means of variable pump curve. The hydraulic schemes for experimental study of frequency-controlled pumps presented in the article have certain disadvantages: 1) the location of the pump relative to the tank is ambiguous regarding the operation of the pump under flooded s

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Shibata, T., K. Ohkoshi, K. Shinto, K. Nanmo, K. Ikegami, and H. Oguri. "Soundness evaluation of J-PARC RF ion source after 5-month continuous operation." Journal of Physics: Conference Series 2244, no. 1 (2022): 012041. http://dx.doi.org/10.1088/1742-6596/2244/1/012041.

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Abstract In the J-PARC user operation from Nov. 2020 – Apr. 2021, continuous operation of J-PARC Radio Frequency (RF) negative hydrogen ion (H-) source up to 3,651 hours (5 months) has been achieved. The ion source was operated with the output H- current of 60 mA, the duty factor (for plasma generation) 2% and the input RF power up to 30 kW. After the operation, phase space diagrams at the Radio Frequency Quadrupole linac (RFQ) entrance were measured by the emittance monitor at the ion source test stand (IS-TS) under the same operation condition as in the J-PARC Linac. Comparison of the phase

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Xue, Mingchen, and Ruiqi Wang. "Abnormal Vibration Test and Cause Analysis of Bogie Brake Test Stand." Journal of Physics: Conference Series 2553, no. 1 (2023): 012071. http://dx.doi.org/10.1088/1742-6596/2553/1/012071.

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Abstract In this paper, the abnormal vibration of the bogie brake test stand during its operation is tested and analyzed. The vibration test and modal test were carried out for the test stand, and the radial runout test was carried out for the wheels of the bogie and the rollers of the test stand. By analyzing the results of the stability test, modal test, and Fourier transform method, the time-frequency spectrum of the bearing pedestal is obtained. The degree of the wheel polygon is obtained by analyzing the wheel out of roundness through the radial runout test results. The comprehensive comp

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Samonov, Sergii, and Vitalii Dubovyk. "The use of a frequency converter for the activation of a stand-by diesel generator of a ship’s powerplant." Computational Problems of Electrical Engineering 9, no. 1 (2019): 27–32. http://dx.doi.org/10.23939/jcpee2019.01.027.

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The paper considers the ways of accelerating the activation of a ship's stand-by diesel generator by using advantages of a vector controlled frequency converter during the activation for obtaining additional power reserve in ship's automated electrical powerplants. The activation of the stand-by generator and putting it into operation can often be needed for startup of ship’s powerfull consumer, in the cases of failures in running equipment, accidents, in an emergency, or changes in navigation conditions, as well as while fixing the vessel location during the dynamic positioning. The main obst

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Gilpin, Matthew R., Will A. McGehee, N. Ivan Arnold, Michael R. Natisin, and Zachary A. Holley. "Dual-axis thrust stand for the direct characterization of electrospray performance." Review of Scientific Instruments 93, no. 6 (2022): 065102. http://dx.doi.org/10.1063/5.0087716.

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A dual-axis torsional thrust stand was successfully demonstrated at the Air Force Research Laboratory, enabling direct simultaneous thrust and mass loss measurement for the Air Force Electrospray Thruster Series 2 passively fed electrospray thruster. The dual-axis system is effectively two nulled torsional thrust stands sharing a single dual-axis gimbal with a thrust and mass resolution of ±0.2 µN and ±0.04 mg, respectively. The development of this system was inspired by a need for direct efficiency characterization of electrosprays via in situ mass measurements, and performance was compared t

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Hoffman, Benjamin F., David C. Wedge, and Charles J. Gadzik. "Scandinavian Thinning Techniques in a Natural Northeastern Softwood Stand." Northern Journal of Applied Forestry 4, no. 1 (1987): 38–42. http://dx.doi.org/10.1093/njaf/4.1.38.

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Abstract The applicability of Scandinavian thinning techniques to small-diameter northeastern softwood stands was tested in a hemlock stand in central Maine. Cutting used motormanual techniques in which the cutter felled, limbed, bucked and piled 8-ft bolts for extraction to trailside by a small tractor and winch. Sixteen-foot lengths were also cut in order to compare the relative merits of the two sizes. To simulate radio control, the winch was activated by a retractable nylon line that permitted the operator to control it remotely from within the stand. A small, tracked forwarder transported

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Peters, Willi, Sakthivel Mariappan, and Jean-Francois Drillet. "Coupling of Offshore & Offgrid Wind Power & PtX-Processes, Supported by a MWh-Scale Battery for Safety, Stand-By Energy & PtX-Process Support." ECS Meeting Abstracts MA2024-02, no. 1 (2024): 81. https://doi.org/10.1149/ma2024-02181mtgabs.

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A promising path for long-term energy storage is the production of e-fuels via Power-to-X processes (PtX). “Green” hydrogen is generated via water electrolysis and serves as a basic feedstock for the synthesis of chemicals and fuels such as methane, ammonia, methanol and other synthetic hydrocarbons. These fuels offer the advantage of an existing storage infrastructure and furthermore allow for the coupling of all energy sectors, e.g. transportation, industry, heating etc., to wind and solar power. Within the German flagship project H2Mare the consortium PtX-Wind is developing experimental, re

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Liu, Tianyi, and Hai Bao. "A Two-Stage PV Accommodation Optimization in Jinzhai County, Anhui Province with Hydropower as Stand-By Unit." E3S Web of Conferences 252 (2021): 01017. http://dx.doi.org/10.1051/e3sconf/202125201017.

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In respond to the national “Photovoltaic Poverty Alleviation” and renewable energy accommodation policy, this paper proposes a two-stage PV accommodation optimization strategy based on improved PSO, PV forecast, and hydropower dispatch to tackle with the instability caused by distributed PV, since Jinzhai County, Anhui Province has both sufficient hydropower and photovoltaic. In the first stage, the hydropower reserve capacity of each period of the next day is optimized according to the PV forecast. In the second stage, real-time online optimization is carried out using the operation data to d

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Kang, Jie, Jian Hui Di, and Jin Peng Kang. "Study on a Testing Device of Automobile Brake Drum Running-In and Braking Force." Applied Mechanics and Materials 321-324 (June 2013): 1583–86. http://dx.doi.org/10.4028/www.scientific.net/amm.321-324.1583.

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This paper introduces a kind of testing device for automobile brake drum running-in stand and braking force, this device combines the existing car drum brake with braking force by means of increasing the frequency conversion speed control device and redesigning control system. Using this device will reduce the occupied site and realize the conversion between two functions in situ and save the operation time of function conversion. It can completely replace the original car drum brake running-in stand and braking force test bench.

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Oțăt, O. V., I. Dumitru, D. Tutunea, L. Matei, and G. Marinescu. "Theoretical and experimental considerations regarding the airbag system operation." IOP Conference Series: Materials Science and Engineering 1311, no. 1 (2024): 012048. http://dx.doi.org/10.1088/1757-899x/1311/1/012048.

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Abstract The concept of Passive Safety aims to reduce the harmful effects on vehicle occupants and pedestrians in the event of an accident. Intelligent car bodies and restraint systems have been designed. Thus, side, front, knee and head airbag systems have been introduced, as well as pre-strained seat belts and force limiters. The objectives of car manufacturers are not only to reduce injuries that can cause death, but also a significant reduction of those that can result in permanent damage such as a whiplash. Advanced airbag systems are currently introduced, which offer protection to the oc

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