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Journal articles on the topic 'Turbo-unit'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

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1

Nelson, C. J., L. Stankovic, and B. Honary. "Partial unit memory-based turbo codes." Electronics Letters 45, no. 21 (2009): 1081. http://dx.doi.org/10.1049/el.2009.1699.

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2

Bernard, Akindade Adaramola. "A Systematic Approach of Turbo Generators Performance Evaluation Maintenance for Continuous Power Generation." J. of Advancement in Engineering and Technology 7, no. 4 (2020): 05. https://doi.org/10.5281/zenodo.3794868.

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Electricity demand in Nigeria far outstrips the supply which is epileptic in nature. The research presents to a systematic approach for maintenance of turbo generators to reduce power outages for continuous generation of electricity. Energy generated (MWH) is the summation of hourly MW generation on the turbo units multiplied by the number of hours the units are in operation. This is usually indicated on an energy integrator dependent on Unit Availblity (UA).  UA is the ratio of the number of hours a unit is available for operation to the number of hours in the period considered. Plant ev

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3

Isakov, Andrei N., Andrei V. Andrusich, and Igor E. Savraev. "Device for Reduction Sparking of Slip Ring of Turbo Generator." Environment. Technology. Resources. Proceedings of the International Scientific and Practical Conference 2 (August 8, 2015): 116. http://dx.doi.org/10.17770/etr2013vol2.851.

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Most modern power plants generating electric power equipped with synchronous generators. The correct operation of energy economy depends on reliability of such electrical machines. In this article issue of increasing reliability of turbo generator by increasing reliability of its brush contact unit is considered. Description of brush contact unit and its possible damages is given. Equivalent electrical circuit of contact layer of brush contact unit is performed. The equations are formed and the dynamical simulation model consisting of electric source and two brush contact units is created. Wit

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4

Jose A, Liji, and Sethu Raj. "Low Complexity Turbo Decoder with ACS Unit." International Journal of Engineering Trends and Technology 36, no. 8 (2016): 446–51. http://dx.doi.org/10.14445/22315381/ijett-v36p280.

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5

Nardón, Gustavo F., Guido F. Botta, Kojo A. Aikins, David Rivero, Fernando Bienvenido, and Diogenes L. Antille. "Seeding System Configuration Effects on Sunflower Seedling Emergence and Yield under No-Tillage." Soil Systems 5, no. 4 (2021): 72. http://dx.doi.org/10.3390/soilsystems5040072.

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No-tillage farming can improve crop productivity and the reliability of cropping compared with conventional tillage. The effects of three different seeding system configurations on surface residue handling, sunflower emergence and stand establishment, yield, and gross income were investigated over three cropping seasons. The seeding system configurations comprised of (1) turbo coulter blade, (2) notched disc row cleaner before turbo coulter blade, and (3) no residue handling unit installed in front of a double-disc opener. For all three seeding system configurations, crop residue cover on sown

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6

Lindberg, Mark B. "Fisher: A turbo pascal unit for optimal partitions." Computers & Geosciences 16, no. 5 (1990): 717–32. http://dx.doi.org/10.1016/0098-3004(90)90029-s.

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7

Yang, Yarang, and Yunpeng Li. "Research and Implementation of Turbo Coding Technology in High-Speed Underwater Acoustic OFDM Communication." Journal of Robotics 2022 (March 15, 2022): 1–11. http://dx.doi.org/10.1155/2022/2576303.

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It is demonstrated that the fully parallel turbo decoding algorithm can achieve an approximate error correction decoding performance when 36 iterations are used and when the log-map algorithm with 6 iterations is used. By comparison, it is shown that it can achieve much higher decoding rates than the log-map algorithm for various frame lengths of LTE standard turbo codes at the cost of higher hardware resource requirements. According to the fully parallel turbo decoding algorithm, this paper proposes a scheme for implementing a fully parallel turbo decoder on FPGA, detailing the overall struct

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8

Ferone, E., A. Pierallini, M. Bonamini, et al. "Utilità delle sequenze turbo-flair e analisi volumetrica della regione ippocampale nella valutazione del paziente con epilessia temporale farmaco-resistente." Rivista di Neuroradiologia 10, no. 2_suppl (1997): 54–56. http://dx.doi.org/10.1177/19714009970100s220.

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The aim of this study was to evaluate the hippocampal region using Fluid Attenuation Inversion Recovery sequences (Turbo-FLAIR) to detect signal intensity abnormalities, and volumetric sequences to detect cortical thickness changes, in patients with drug-resistant temporal epilepsy. We evaluated 30 patients with drug-resistant temporal epilepsy with a 1.5 Tesla unit (NT 15 Philips Gyroscan). Conventional SE, Turbo SE, IR, Turbo-FLAIR, volumetric 3D sequences on coronal plane, PD, T2weighted SE sequences on axial plane, T1-weighted SE on sagittal plane / were performed. Signal intensity and vol

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9

Gao, Jin Shui, and Guo Biao Gu. "Research on Taylor Vortices in the Wedge-Shaped Air Gap of Evaporation Cooling Turbo Generator." Applied Mechanics and Materials 187 (June 2012): 103–8. http://dx.doi.org/10.4028/www.scientific.net/amm.187.103.

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Cooling technique is one of the most important parts to improve the development of turbo generator. Turbo generator with evaporative cooling stator and water cooling rotor possesses many excellent qualities for mid unit. In this system the stator bars and core are immerged in evaporative coolant, which could be cooled fully. The rotor bars are cooled by water inner cooling mode. In this paper, we describe the Taylor Vortices in the Wedge-shaped air gap of Evaporation cooling Turbo Generator and present the research on gas-flow and heat-transfer with different features in the turbo generator. T

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10

Ma, Lyuzhou. "Troubleshooting of a 330MW turbo generator unit during commissioning." Journal of Physics: Conference Series 1748 (January 2021): 052051. http://dx.doi.org/10.1088/1742-6596/1748/5/052051.

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11

Fermoselli, N. E. G. "PREDICTING THE IMPACT OF A FCC TURBO EXPANDER ON PETROLEUM REFINERIES." Revista de Engenharia Térmica 9, no. 1-2 (2010): 40. http://dx.doi.org/10.5380/reterm.v9i1-2.61929.

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Implementing a turbo expander connected to a fluid catalytic cracking (FCC) unit in order to produce power from flue gas has already become a common practice in oil refineries worldwide. Despite of recovering energy which used to be wasted in an orifice chamber, the implementation of expander and its skids still requires high investment, which often begins with a third-stage cyclones installation to enhance flue gas cleanness. Moreover, machine and also pipes need to be made with special materials in order to resist high temperatures and erosion. Hence, there are some items to be checked befor

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12

He, Cheng Bing, Cheng Xing, and Jian Shen. "An Increment Transfer Matrix Method for the Torsional Vibration Response of Steam Turbo-Generator Shaft System." Applied Mechanics and Materials 34-35 (October 2010): 1082–87. http://dx.doi.org/10.4028/www.scientific.net/amm.34-35.1082.

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In order to solve nonlinear system torsion response of turbo-generator unit, an increment transfer matrix method based on step-by-step integration method and traditional transfer matrix method was put forward. The method can be directly used to analyze nonlinear differential equations. Combined with Riccati method, the increment transfer matrix method was used in a multi-mass model. And matrix equations calculating the responses of torsional vibrations were deduced. Torsional vibration resulted from the faults of short circuit and asynchronous synchronization of 600MW steam turbo-generator uni

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13

Liu, Shi, Cong Wang, Bing Li, Chang Chen, and Dan Mei Xie. "Sensitivity Analysis of 1000MW USC Units Shafting Torsional Vibration Based on ANSYS." Applied Mechanics and Materials 226-228 (November 2012): 162–65. http://dx.doi.org/10.4028/www.scientific.net/amm.226-228.162.

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To calculate a shaftings natural frequency of torsional vibration is one of the most important tasks in turbo-generators design, manufacture and frequency adjusting process. The sensitivity analysis of shafting structural parameters impact on the torsional vibration characteristics has important significance in reducing the amplitude of torsional vibration and ensuring the turbo-generators safe operation. In this paper, a 1000MW USC unit was taken as a research object to analyze the shaftings sensitivity to moment of inertia.

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14

Belkhode, Pramod. "Balancing Technique for Turbo Machinery Rotor." WSEAS TRANSACTIONS ON HEAT AND MASS TRANSFER 17 (May 10, 2022): 131–35. http://dx.doi.org/10.37394/232012.2022.17.14.

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Balancing process carried out in the thermal power station is very complex and complicated. The complete unit is to be cooled down for balancing this takes nearly 10 to 15 days. After cooling the unit is disassembled and the rotor is taken out for which again 10 to 15 days are required for balancing and assembly. Rotor is placed on the balancing machines for balancing which is carried out by Engineers of the testing department. Balancing of a bulky rotor is difficult and it is carried out step by step. After balancing, complete rotor is to be placed in the turbo machine which is a most difficu

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15

He, Cheng Bing, and Shi Chao Wang. "Study on the Coupled Bending and Torsional Vibrations of Turbo-Generator Unit with Rub-Impact." Applied Mechanics and Materials 246-247 (December 2012): 1273–77. http://dx.doi.org/10.4028/www.scientific.net/amm.246-247.1273.

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An increment transfer matrix equations based on step-by-step integration method and traditional transfer matrix method are deduced Combined with multi-mass model and Riccati method, the increment transfer matrix method is put forward, that can be directly used to analyze the dynamic response of the coupled bending and torsional vibrations of turbo-generator shafts with rub-impact. Taking a turbo-generator unit as example, the vibration character of rub-impact fault is analyzed when unit starts up. The research results show that rubbing will make vibration amplitude increase when the rotational

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16

He, Xi, and Yu Jiong Gu. "Analysis on Torsional Vibration Characteristics of Turbo-Generator Units Based on Finite Element Method." Advanced Materials Research 915-916 (April 2014): 22–25. http://dx.doi.org/10.4028/www.scientific.net/amr.915-916.22.

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The torsional vibration problems of turbo-generator shafts are increasing widespread and sever under the coupled action between the turbo-generator unit and the power grid because of the complicated power grid structure. Thus, the accurate solution of torsional vibration inherent characteristics of the shafts is of great significance to do the safety evaluation. The finite element method (FEM) with higher accuracy is adopted to calculate the torsional vibration inherent characteristics in this paper. A 1000 MW turbo-generator shaft is taken as a studying object and its torsional vibration fini

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17

Wahid, Abdul, and Ilham Maulana. "Optimation of Depropanizer Unit using Turbo Expander and Its Controller using Model Predictive Control." E3S Web of Conferences 67 (2018): 03014. http://dx.doi.org/10.1051/e3sconf/20186703014.

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In this study, Turbo expander (TE) and Model Predictive Control (MPC) is suggested for depropanizer unit to increase propane recovery and improve control performance of the unit. The model that used in the MPC is a first order plus dead time (FOPDT), which tested the control performance using set point (SP) and disturbance change test. The measurement of the performance is the integral of the absolute error (IAE). As a result, use of TE in the depropanizer able to increase the recovery of propane of 8.44% (from 82.11% to 90.55%). The control structure of the depropanizer unit using turbo expan

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18

Plokhov, Igor, Igor Savraev, Alexander Ilyin, Oksana Kozyreva, and Sergey Loginov. "Diagnostics and Forecasting of the Turbo-generators Sliding Current Collection Units Technical Condition." E3S Web of Conferences 216 (2020): 01064. http://dx.doi.org/10.1051/e3sconf/202021601064.

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The article is about assessing the reliability levels of the main diagnostic procedures, determining prognostic recommendations, developing a three-factor regression expert model, obtaining a generalized assessment of the turbo-generator sliding current collection unit functioning quality, and building a logical-analytical system for diagnostics and forecasting of the sliding current collection unit technical condition.

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19

Zhang, Rong Pei, and Sheng Yang Lu. "Characteristics and Elimination of Vibration Transfer on Small- and Medium-Sized Turbo Generators." Applied Mechanics and Materials 318 (May 2013): 120–24. http://dx.doi.org/10.4028/www.scientific.net/amm.318.120.

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Vibration control is important for the safe and stable operation of generator units. The vibration transfer characteristics of small- and medium-sized turbo generators are different from those of large capacity units due to differences in mechanical structures. We point out that the vibration on small- and medium-sized turbo generators propagates through their foundation from one bearing to another, rather than through the shafting. In particular, transmission of horizontal vibration measured on bearings is found to be more significant compared with vertical and axial vibration due to the heig

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20

Yuan, Rong Di, and Cao Bin Zhang. "A Hardware-in-Loop Simulation System for Crush Natural Gas Turbo Engine." Advanced Materials Research 466-467 (February 2012): 1368–72. http://dx.doi.org/10.4028/www.scientific.net/amr.466-467.1368.

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Real-time model is one of the key elements in Hardware In Loop (HIL) simulations. A new Crush Natural Gas (CNG) Turbo Engine model and HIL simulation platform are presented in this paper. The platform provides simulations of engine speed, torque, dynamic load, turbo, exhaust gas temperature and emissions conditions. The platform is based on Matlab/Simulink, Labview and can be seamlessly connected with a CNG engine control unit (ECU). Simulation results indicate that platform provide us higher development efficiency as well as lower reduce development expense of ECU.

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21

Passas, Georgios, and Steven Freear. "VLSI Architectures for Sliding-Window-Based Space-Time Turbo Trellis Code Decoders." Journal of Electrical and Computer Engineering 2012 (2012): 1–14. http://dx.doi.org/10.1155/2012/614259.

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The VLSI implementation of SISO-MAP decoders used for traditional iterative turbo coding has been investigated in the literature. In this paper, a complete architectural model of a space-time turbo code receiver that includes elementary decoders is presented. These architectures are based on newly proposed building blocks such as a recursive add-compare-select-offset (ACSO) unit, A-, B-, Γ-, and LLR output calculation modules. Measurements of complexity and decoding delay of several sliding-window-technique-based MAP decoder architectures and a proposed parameter set lead to defining equations

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22

Ovsyannik, A. V., and V. P. Kliuchinski. "Turbo-Expander Units on Low Boiling Working Fluids." ENERGETIKA. Proceedings of CIS higher education institutions and power engineering associations 64, no. 1 (2021): 65–77. http://dx.doi.org/10.21122/1029-7448-2021-64-1-65-77.

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The article examines the possibility of increasing the efficiency of the turbo-expander cycles on low-boiling working fluids using those methods that are used for steam turbines, viz. increasing the parameters of the working fluid before the turbo-expander and using secondary overheating. Thus, four schemes of the turbo-expander cycle are considered: the one without overheating of the low-boiling working fluid, the one with single overheating of low-boiling fluid, the one with double overheating and the one with double overheating at supercritical parameters. All the studied cycles were consid

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23

Thomas, Cornelius Temitope, Olalekan Ogunbiyi, Mudathir Funsho Akorede, and Jimi Benjamin Olufeagba. "Assessment of Failure and Repair Behaviours of the Jebba Hydroelectric Power Station." ELEKTRIKA- Journal of Electrical Engineering 17, no. 3 (2018): 13–19. http://dx.doi.org/10.11113/elektrika.v17n3.113.

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Nigeria power generation is circa 4000 MW as at October 2016, this is far less than the national required value.Jebba Hydroelectric Power Station (JHEPS) is one of the three major hydropower stations in the country which its maximumaverage generation value is still less than the rated value of 578.4 MW. This paper presented some basic concepts of analysisof failure and repair. An algorithm was set up to extract the contiguous set of up-times and down-times to determine time-tofail (TTR) and time-to-repair (TTR) events, these events were analyzed for stochastic study. It was observed that the l

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24

Pipitone, Emiliano, Salvatore Caltabellotta, Antonino Sferlazza, and Maurizio Cirrincione. "Hybrid Propulsion Efficiency Increment through Exhaust Energy Recovery—Part 2: Numerical Simulation Results." Energies 16, no. 5 (2023): 2232. http://dx.doi.org/10.3390/en16052232.

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The efficiency of hybrid electric vehicles may be substantially increased if the energy of exhaust gases, which do not complete the expansion inside the cylinder of the internal combustion engine, is efficiently recovered using a properly designed turbo-generator and employed for vehicle propulsion. Previous studies, carried out by the same authors of this work, showed a potential hybrid vehicle fuel efficiency increment up to 15% employing a 20 kW turbine on a 100 HP-rated power thermal unit. The innovative thermal unit proposed here is composed of a supercharged engine endowed with a properl

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25

Strzelecki, Stanisław. "EFFECT OF THE MISALIGNMENT OF JOURNAL AND SLEEVE AXIS ON THE OPERATION OF TURBO UNIT JOURNAL BEARINGS." Tribologia 293, no. 5 (2021): 73–84. http://dx.doi.org/10.5604/01.3001.0014.6961.

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In journal bearings the misalignment of the journal and sleeve axis causes a load concentration on their edges, mixed lubrication conditions, an increase in the bearing temperature, rotor instability, and intensive wear of mating parts. The rotating machines are controlled by means of the temperature and vibration transducers, which are placed in the middle plain of the bearing housing. This arrangement of transducers gives no information about the real distance between the journal surface and bearing edges, and, in case of misaligned shaft, it has crucial meaning for the correct operation of

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26

Deng, Xiao Wen, Yu Jiong Gu, Li Ping Fang, Zhao Xu Ren, and Ya Peng Han. "Study of Intelligent Fault Diagnosis Method for Turbo-Generator Unit Based on Support Vector Machine and Knowledge." Applied Mechanics and Materials 543-547 (March 2014): 1057–63. http://dx.doi.org/10.4028/www.scientific.net/amm.543-547.1057.

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For the low efficiency and poor accuracy of turbo-generator Unit s fault diagnosis, this paper divided the common 18 kinds of vibration fault into four categories, and took advantage of support vector machine to distinguish the fault cluster for early fault diagnosis according to the characteristics of vibration signal spectrum. For different fault cluster, different fault pattern recognition model was established. With the use of certain symptom group and weighted fuzzy logic, this article engaged in knowledge reasoning to obtain the specific fault recognition mode. Besides, the searching met

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27

Ovsyannik, A. V., and V. P. Kliuchinski. "Thermodynamic Analysis and Optimization of Secondary Overheating Parameters in Turbo-Expander Plants on Low Boiling Working Fluids." ENERGETIKA. Proceedings of CIS higher education institutions and power engineering associations 64, no. 2 (2021): 164–77. http://dx.doi.org/10.21122/1029-7448-2021-64-2-164-177.

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The paper presents a thermodynamic analysis of secondary overheating in turbo-expander plants on low-boiling working fluids. The possibility of optimizing the parameters of the working fluid in a secondary stem superheater has been studied. The research was carried out for two typical turbo-expander cycles: with a heat exchanger at the outlet of the turbo-expander, intended for cooling an overheated low-boiling working fluid, and without a heat exchanger. Cycles in T–s coordinates were constructed for the studied schemes. The influence of pressure and temperature in the intermediate superheate

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28

Belosludtsev, Viktor, Sergey Borovik, Valeriy Danilchenko, and Yuriy Sekisov. "Wear Diagnostics of the Thrust Bearing of NK-33 Turbo-Pump Unit on the Basis of Single-Coil Eddy Current Sensors." Sensors 21, no. 10 (2021): 3463. http://dx.doi.org/10.3390/s21103463.

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The problem of early wear diagnostics of the combined journal-and-thrust bearing of the turbo-pump unit (TPU) of the liquid-propellant rocket engine NK-33 is considered. A feature of the problem is the significant restriction on modifications of the power plant’s design. The original solution based on replacing the standard induction sensors of the turbo-pump rotational speed currently used in TPU by single-coil eddy current sensors (SCECS) with sensitive elements in the form of a segment of a linear conductor is proposed. The SCECS provide the monitoring of the axial displacement of the shaft

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29

Łapinski, Damian, and Janusz Piechna. "Improvements in the turbo-engine by replacement of conventional combustion chamber by a pulse combustion chamber." Archive of Mechanical Engineering 60, no. 4 (2013): 481–94. http://dx.doi.org/10.2478/meceng-2013-0029.

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Abstract This paper comprises description of the turbo engine and evaluation of its analytical model. The analytical model was created to establish a benchmark for further evaluation of a wave rotor combustor (at constant volume). The wave rotor combustor concept was presented and discussed. Advantages of combustion at constant volume were described as well as the basic turbo engine updates required to reflect pulse combustor application. The calculation results for analytical model of a basic engine, and that equipped with pulse combustor are included in this paper. The paper describes the re

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30

Platow, Michael J., and Roger Shave. "Scales: A Turbo Pascal 6.0 unit for presenting simple attitude scales." Behavior Research Methods, Instruments, & Computers 26, no. 3 (1994): 372. http://dx.doi.org/10.3758/bf03204649.

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31

Kim, Hyeji, Youngjoo Lee, and Ji‐Hoon Kim. "Low‐complexity CRC‐aided early stopping unit for parallel turbo decoder." Electronics Letters 51, no. 21 (2015): 1660–62. http://dx.doi.org/10.1049/el.2015.2262.

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32

Montazeri-Gh, Morteza, and Soroush Abyaneh. "Real-time simulation of a turbo-shaft engine's electronic control unit." Mechanics & Industry 18, no. 5 (2017): 503. http://dx.doi.org/10.1051/meca/2017025.

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33

Shcherbakov, Oleg, Leonid Plyatsuk, and Volodymyr Parafiynyk. "ENVIRONMENTAL ASPECTS OF DESIGNING TURBOCOMPRESSOR UNITS OF COMPRESSOR STATIONS OF MAIN GAS PIPELINES." Technogenic and Ecological Safety, no. 16(2/2024) (November 28, 2024): 61–68. https://doi.org/10.52363/2522-1892.2024.2.9.

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The article examines the environmental aspects of creating turbo-compressor units for compressor stations of main gas pipelines. The aim of the study is to identify and analyze the main sources of environmental pollution arising from the operation of turbo-compressor units, as well as to analyze modern technical solutions aimed at reducing their negative impact on the environment. This goal is achieved through an analysis of the operational processes of turbo-compressor units, a review of literature sources and applicable regulations, as well as the systematization of many years of experience

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34

Malykov, Aleksey, Aleksey Babushkin, Kirill Naginaev, Ludmila Kinash, and Artem Kalashnikov. "Study of change in 300 MW power unit efficiency operation under reduced loads." MATEC Web of Conferences 329 (2020): 03080. http://dx.doi.org/10.1051/matecconf/202032903080.

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The article presents the results of the study of technical and economic parameters of power unit’s operation under reduced turbine generator loading, related to the night power dip and wear of power plant units. Changes in fuel consumption under reduced loading, change in power unit efficiency and change in main specific characteristics of the power unit were investigated. Conclusions on the 300 MW power unit’s operation modes under different turbo-generator loads were drawn based on the results of the calculations and investigations.

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35

Wan, Shuting, and Yuling He. "INVESTIGATION ON STATOR AND ROTOR VIBRATION CHARACTERISTICS OF TURBO-GENERATOR UNDER AIR GAP ECCENTRICITY FAULT." Transactions of the Canadian Society for Mechanical Engineering 35, no. 2 (2011): 161–76. http://dx.doi.org/10.1139/tcsme-2011-0010.

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This paper investigates the stator and the rotor vibration characteristics of turbo-generator under the air gap eccentricity fault. Firstly the air gap magnetic flux density of the fault is deduced, and the formula of the magnetic pull per unit area acting on the stator and the unbalanced magnetic pulls of x-axis and y-axis acting on the rotor are respectively gotten. Then the static eccentricity, the dynamic eccentricity and the mixed eccentricity are respectively studied to analyze the stator and the rotor vibration characteristics. Finally experiments are done on a SDF-9 non-salient fault s

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36

Wan, Shuting, Yuling He, and Changgeng Zhan. "EFFECT OF INTERNAL POWER-ANGLE ON TURBO-GENERATOR ROTOR VIBRATION CHARACTERISTICS UNDER ECCENTRICITY FAULTS." Transactions of the Canadian Society for Mechanical Engineering 38, no. 1 (2014): 63–79. http://dx.doi.org/10.1139/tcsme-2014-0005.

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This paper investigates the effect of the turbo-generator internal power-angle on the rotor radial vibration characteristics under air gap eccentricity faults. Firstly the air gap magnetomotive force, the magnetic permeance and the magnetic flux density of the eccentricity faults is deduced, and the formula of the magnetic pull per unit area is obtained. Then the restrictive factors of the magnetomotive force and the internal powerangle are analyzed. The unbalanced magnetic pull (UMP) that acts on the rotor is further deduced, and the rotor vibration characteristics are given. Finally the expe

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37

Sandovsky, A. V., S. N. Gavrilov, L. A. Khomenok, A. V. Karpychev, and Z. F. Shorokhova. "Diagnosis of ring cracks on the shafting line of a turbo unit." Safety and Reliability of Power Industry 17, no. 3 (2024): 206–11. http://dx.doi.org/10.24223/1999-5555-2024-17-3-206-211.

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Due to the growing number of accidents associated with damage to turbine unit shafts, there is a pressing need to diagnose the occurrence and growth of ring cracks not only during planned repair work on the turbine unit, but also directly during its operation to prevent emergency failures and costly repairs of the machine. Ring cracks that develop in the shafting do not lead to an increase in the level of vibration of the rotor or its support bearings and, therefore, cannot be detected by standard operational vibrodiagnostic systems. In this paper we propose a method that allows for the diagno

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38

Cai, Wenfang, Guangyao Ying, Weijun Li, and Zaihua Wang. "The Analysis of a Generator Shaft Crack Cause by Torsional Vibration due to SSR." Journal of Physics: Conference Series 2101, no. 1 (2021): 012022. http://dx.doi.org/10.1088/1742-6596/2101/1/012022.

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Abstract Abstract.This paper introduces the serious crack accident of the rotor of a 600 MW turbo-generator unit in Vietnam, which leads to the rotor scrapped. After excluding the material and design reasons, it is considered that the electrical torque is the possibility. Through the operation parameters and theoretical calculation of the unit, the fault reason is positioned as Sub-synchronous resonance. The most important criterion is that the vibration of Unit 1 increases simultaneously with that of Unit 2, which is physically isolated from Unit 1. Further theoretical calculation shows that

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39

Plokhov, Igor, Igor Savraev, Alexander Ilyin, Oksana Kozyreva, and Alexander Dementiev. "RESONANT ELECTROMAGNETIC PROCESSES AT UNSTABLE OPERATION OF SLIDING CURRENT COLLECTOR UNITS OF TURBOGENERATOR." ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 3 (June 16, 2021): 281–85. http://dx.doi.org/10.17770/etr2021vol3.6530.

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The article is devoted to study of the resonance electromagnetic oscillations arising during unstable operation of the sliding current collection unit of turbo-generators. Mathematical modeling of these processes is carried out. It has been established that it is these processes that are the main cause of increased sparking and “ring fire” or “breakdown of commutation” on contact rings.

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WAKUI, Shinji, Toshiya TANAKA, and Kan AKATSU. "Application of Turbo Molecular Pump Using Magnetic Bearing to Vibration Suppression Unit." Journal of the Japan Society for Precision Engineering, Contributed Papers 71, no. 9 (2005): 1184–88. http://dx.doi.org/10.2493/jspe.71.1184.

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Yahya, Dr Fares. "Modal Analysis of Quill Shaft in Turbo-generator Unit Based on SolidWorks." AL-Rafdain Engineering Journal (AREJ) 24, no. 1 (2019): 55–66. http://dx.doi.org/10.33899/rengj.2019.163197.

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Yu, Xiangbin, and Guangguo Bi. "Unit-rate complex orthogonal space-time block code concatenated with turbo coding." Journal of Electronics (China) 23, no. 3 (2006): 346–49. http://dx.doi.org/10.1007/s11767-004-0149-4.

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Renoe, B. W., G. L. Combs, E. E. Coffee, and R. F. DeGrella. "Critical evaluation of the TDx Turbo Nephelometry System." Clinical Chemistry 34, no. 12 (1988): 2524–27. http://dx.doi.org/10.1093/clinchem/34.12.2524.

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Abstract We critically evaluated the Nephelometry System (TDx Turbo) for the TDx Analyzer (Turbo), as currently used for immunoglobulins (IgA, IgG, and IgM) and transferrin assays. We describe hardware, software, reagent, and procedural changes made since the original publication (Clin Chem 1985;31:1474) and the mathematical treatment of data. The unit-dose format of the reagents allows for batch or panel testing of the analytes, with a throughput of 40 tests per hour. Measurements are made at pseudo-equilibrium, with sample-blank correction. The formulation of reagents and the assay scheme ar

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Borovik, Sergey Yu, Valeriy P. Danilchenko, Marina M. Kuteynikova, and Yuriy N. Sekisov. "The errors of the shaft's axial movement measuring in the single-coil-eddy-current-sensors-based system for the monitoring the state of radial thrust bearing of the NK-33 liquid rocket engine’s turbopump unit." Vestnik of Samara State Technical University. Technical Sciences Series 32, no. 1 (2024): 86–101. http://dx.doi.org/10.14498/tech.2024.1.6.

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This article continues a series of publications devoted to the problems of early state diagnosis of the combined journal-and-thrust bearing of the turbo-pump unit of the liquid-propellant rocket engine NK-33, which is a critical node of the power plant under consideration. The proposed approach is based on the idea of replacing the standard induction sensors of the turbo-pump rotational speed currently used in turbo-pump unit by specially designed single-coil eddy current sensors with sensitive elements in the form of a segment of a linear conductor. The transducers are placed in the same moun

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Riana Mageles Lodia Panie, Putu Irma Wulandari, Triningsih Triningsih, and Anak Agung Ayu Meidiary. "Peranan Sekuen T1 SPACE Coronal Pada Pemeriksaan MRI Brain Dengan Klinis Epilepsi Lobus Temporal Di Unit Radiologi RSUP Prof. Dr. I.G.N.G. Ngoerah Denpasar." Jurnal Ilmu Kesehatan dan Gizi 2, no. 1 (2023): 53–58. http://dx.doi.org/10.55606/jikg.v2i1.2099.

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Background: Magnetic resonance imaging (MRI) is a cross-sectional imaging technique based on the principle of magnetic resonance of hydrogen atoms due to radio frequency (RF) signals with the same frequency as the precession frequency (lamor frequency). MRI at the beginning of its development used a semiconductor magnetic field with a power of 0.5-1.5 Tesla, but now MRI uses a superconductor magnetic field with a power of 1.5-3 Tesla. One of the advantages of brain MRI in epilepsy cases is that it can display clear information about the anatomy and pathology of the head in general in the tempo

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Wang, Hai Tao, and Yun Chun Xia. "The Thermal Stress of a Domestic 300MW Steam Turbo Unit during its Startup and Shutdown." Applied Mechanics and Materials 275-277 (January 2013): 87–93. http://dx.doi.org/10.4028/www.scientific.net/amm.275-277.87.

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The simulation system on the thermal stress of the rotor during startup & shutdown for a domestic 300MW steam turbo unit, by the simulation, the surface of the shaft was suffered a crushing stress, but it was a pulling stress when a unit shutdown. The max thermal stress & the max combined stress produced on the rotor of a medium pressure cylinder was about 16% bigger than those on the rotor of the high pressure cylinder when they had the same increase rate of temperature. When thought from economics & safety, the optimal temperature-increase-rate of the rotor was 1.6°C/min when the

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Egorov, A. V., Yu F. Kaizer, A. V. Lysyannikov, et al. "Purification of thermal power plant emissions from carbon dioxide by the liquefaction method as part of a turboexpander unit." Journal of Physics: Conference Series 2094, no. 5 (2021): 052019. http://dx.doi.org/10.1088/1742-6596/2094/5/052019.

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Abstract The purpose of this work is to estimate the energy costs for the utilization of carbon dioxide generated by thermal power plants operating on various types of fuel by the liquefaction method as part of a turbo-expander installation, as well as a general assessment of the efficiency of the TPP during the utilization of carbon dioxide. The energy costs for the liquefaction of carbon dioxide in the turbo-expander unit from the combustion products of thermal power plants running on coal, natural gas and heating oil differ slightly and amount to about 5 MJ/kg of fuel burned. The practical

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Guo, Yu Jie, Yong Wei Tian, Jing Yu Liu, Yan Wu Bai, and Wen Tao Zhang. "Bearing Elevation Monitoring Instrument and its Application on Multi-Support Turbo-Generator Unit." Applied Mechanics and Materials 141 (November 2011): 218–23. http://dx.doi.org/10.4028/www.scientific.net/amm.141.218.

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Based on the communicating vessel principle, we present a new instrument for the measurement of bearing elevation change. A number of cups are attached to the bearings. They are linked with pipes and joints together to constitute a measurement network. Special features of the instrument to make the measurement easily and reliable, such as cup design, are presented. The instrument is used to monitor and analyze the elevation change of a 1000MW turbo-generator during the vacuum setup process. We find that the influence of vacuum on the elevation of bearing located on the exhaust cylinder is larg

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Aslanov, Asvar, Vladimir Raznoschikov, and Alexey Stol’nikov. "Studying parameters of aircraft cryogenic turbo-pump unit by the aircraft flight cycle." Vestnik Moskovskogo aviatsionnogo instituta 27, no. 4 (2020): 124–32. http://dx.doi.org/10.34759/vst-2020-4-124-132.

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Hou, Rongtao. "STUDY ON FAULT DIAGNOSIS TECHNIQUE TO TURBO UNIT BASED ON MODERN NONLINEAR THEORIES." Chinese Journal of Mechanical Engineering 41, no. 02 (2005): 142. http://dx.doi.org/10.3901/jme.2005.02.142.

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