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Journal articles on the topic 'Fuel assembly vibrations'

Author: Grafiati

Published: 4 June 2025

Last updated: 1 August 2025

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1

Perevezentsev, V. "FEATURES OF THE FORMATION OF HYDRODYNAMIC LOADS ON THE FUEL RODS DEPENDING ON THE STRUCTURE OF THE COOLANT FLOW AT THE ENTRANCE TO THE FUEL ASSEMBLY WWER." PROBLEMS OF ATOMIC SCIENCE AND TECHNOLOGY. SERIES: NUCLEAR AND REACTOR CONSTANTS 2021, no. 3 (2021): 136–42. http://dx.doi.org/10.55176/2414-1038-2021-3-136-142.

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Experimental studies of hydrodynamic induced of fuel rods vibrations WWER-440 tweers using a full-scale mock-up with lead imitators of fuel tablets have been carried out. It is shown that the speed of the turbulent flow in the fuel rods beam cannot be the only hydrodynamic characteristic that determines the vibrational characteristics of the fuel rods beams. The presence of indignant flow of various elements of the tract of the coolant to the fuel rods beams inlet significantly affects the intensity of their vibrations. An energy model of the balance of pulsating energy of turbulent flow and e

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2

Verma, V., D. Chionis, A. Dokhane, and H. Ferroukhi. "MODELLING AND ANALYSIS OF FUEL ASSEMBLY VIBRATIONAL MODES IN PWRS USING SIMULATE-3K." EPJ Web of Conferences 247 (2021): 21008. http://dx.doi.org/10.1051/epjconf/202124721008.

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Some of the KWU pre-KONVOI PWRs operating across Europe saw a systematic increase in the neutron noise levels over several cycles in the last decade, and subsequently, core internals’ movements, especially vibrations of fuel assemblies with specific designs were identified as one of the plausible causes. Therefore, it is important to develop computational methods that can allow to investigate and predict the reactor noise response to fuel assemblies vibrations. To this aim, the 3D nodal reactor dynamics code SIMULATE-3K is used at PSI with a special module called the ‘assembly vibration model’

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3

Viebach, M., C. Lange, M. Seidl, Y. Bilodid, and A. Hurtado. "NEUTRON NOISE PATTERNS FROM COUPLED FUEL-ASSEMBLY VIBRATIONS." EPJ Web of Conferences 247 (2021): 02015. http://dx.doi.org/10.1051/epjconf/202124702015.

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The neutron flux fluctuation magnitude of KWU-built PWRs shows a hitherto unexplained correlation with the types of loaded fuel assemblies. Also, certain measured long-range neutron flux fluctuation patterns in neighboring core quadrants still lack a closed understanding of their origin. The explanation of these phenomena has recently revived a new interest in neutron noise research. The contribution at hand investigates the idea that a synchronized coolant-driven vibration of major parts of the fuel-assembly ensemble leads to these phenomena. Starting with an assumed mode of such collective v

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4

Carpenter, Chris. "Bottomhole-Assembly Dynamics Software Helps Mitigate Twistoffs While Drilling." Journal of Petroleum Technology 74, no. 12 (2022): 72–74. http://dx.doi.org/10.2118/1222-0072-jpt.

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_ This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 202174, “Mitigating Twistoffs While Drilling With the Help of Bottomhole-Assembly Dynamics Software,” by Mario A. Rivas, SPE, Andres A. Ramirez, and Bader S. Al‑Zahrani, SPE, Saudi Aramco, et al. The paper has not been peer reviewed. _ A major challenge during drilling operations is the occurrence of twistoffs on bottomhole assembly (BHA) components. To overcome this challenge, a study was performed of twistoffs experienced on BHA components. Based on the findings, drilling operations and recomme

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5

Dyk, Štěpán, and Vladimír Zeman. "Impact vibrations of guide thimbles in nuclear fuel assembly." Archive of Applied Mechanics 87, no. 2 (2016): 231–44. http://dx.doi.org/10.1007/s00419-016-1189-6.

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6

Kalinina, Elena, Doug Ammerman, Carissa Grey, Gregg Flores, Sylvia Saltzstein, and Nicholas Klymyshyn. "Full-Scale Assembly 30 cm Drop Test." MRS Advances 5, no. 5-6 (2019): 265–74. http://dx.doi.org/10.1557/adv.2019.477.

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ABSTRACTCan Spent Nuclear Fuel withstand the shocks and vibrations experienced during normal conditions of transport? This question was the motivation for the multi-modal transportation test (MMTT) (Summer 2017), 1/3-scale cask 30 cm drop test (December 2018), and full-scale assembly 30 cm drop tests (June 2019). The full-scale ENSA ENUN 32P cask with 3 surrogate 17x17 PWR assemblies was used in the MMTT. The 1/3-scale cask was a mockup of this cask. The 30 cm drop tests provided the accelerations on the 1/3-scale dummy assemblies. These data were used to design full-scale assembly drop tests

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7

Zoia, Andrea, Amélie Rouchon, Baptiste Gasse, Christophe Demazière, and Paolo Vinai. "Analysis of the neutron noise induced by fuel assembly vibrations." Annals of Nuclear Energy 154 (May 2021): 108061. http://dx.doi.org/10.1016/j.anucene.2020.108061.

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8

Vidal-Ferràndiz, A., A. Carreño, D. Ginestar, C. Demazière, and G. Verdú. "Neutronic Simulation of Fuel Assembly Vibrations in a Nuclear Reactor." Nuclear Science and Engineering 194, no. 11 (2020): 1067–78. http://dx.doi.org/10.1080/00295639.2020.1756617.

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9

Yong, Han, Huang Shiyong, Han MengXuan, et al. "The Experimental Validation of a Digital Filter Mathematical Modelling for Nuclear Fuel Vibration Monitoring System." Journal of Function Spaces 2022 (June 4, 2022): 1–11. http://dx.doi.org/10.1155/2022/9741419.

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Aiming at vehicles will produce shocks and vibrations for various reasons in the process of transportation and handling, any shock and vibration that exceeds the regulations would cause damage to the nuclear fuel being transported. In order to monitor and analyze the shock and vibration data scientifically, a monitoring system based on MEMS acceleration sensor technology is developed to measure shocks and vibrations. The measured result involves some noise caused by the sensitivity of the sensor and the electrical noise, and a digital filter mathematical modelling is introduced to reduce noise

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10

Yao, Junqi, Yan Yin, Fan Zhang, Zhikun Qin, and Ting Guo. "Numerical simulation of the effect of fixation type on random vibration of fuel cell stacks in various vehicles." Journal of Physics: Conference Series 2903, no. 1 (2024): 012026. https://doi.org/10.1088/1742-6596/2903/1/012026.

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Abstract During vehicle operation, the fuel cell stack onboard inevitably experiences vibration loads due to uneven road surfaces and internal system vibrations. Therefore, this paper conducts a mechanical response analysis of metal plate fuel cell stacks under random vibration loads for various vehicles (passenger vehicles, buses, trailers, and logistics vehicles) and different fixation types (fixing with 14 bolts, fixing with four corner bolts, fixing blind end plates, fixing short sides of both end plates, fixing long sides of both end plates). The stress distribution of the membrane electr

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11

Demazière, C., A. Rouchon, and A. Zoia. "Understanding the neutron noise induced by fuel assembly vibrations in linear theory." Annals of Nuclear Energy 175 (September 2022): 109169. http://dx.doi.org/10.1016/j.anucene.2022.109169.

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12

Vinai, P., H. Yi, C. Demazière, et al. "On the simulation of neutron noise induced by vibrations of fuel pins in a fuel assembly." Annals of Nuclear Energy 181 (February 2023): 109521. http://dx.doi.org/10.1016/j.anucene.2022.109521.

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13

Dareing, D. W. "Vibrations Increase Available Power at the Bit." Journal of Energy Resources Technology 107, no. 1 (1985): 138–41. http://dx.doi.org/10.1115/1.3231153.

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Drillstring vibrations are generally considered to be detrimental to downhole drilling equipment because they produce cyclic or fatigue loading. Tool joint failures, tubular washouts, and bit breakage are often fatigue related. On the positive side, dynamic forces applied to roller cone rock bits have the potential to increase penetration rate. This paper quantifies the available vibration energy at the bit and shows how to control the level of energy through bottom hole assembly design and rotary speed.

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14

Lamirand, Vincent, Pavel Frajtag, Daniel Godat, et al. "The COLIBRI experimental program in the CROCUS reactor: characterization of the fuel rods oscillator." EPJ Web of Conferences 225 (2020): 04020. http://dx.doi.org/10.1051/epjconf/202022504020.

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The present article presents the mechanical characterization of the fuel rods oscillator developed for the purposes of the COLIBRI experimental program in CROCUS. COLIBRI aims at investigating the radiation noise related to fuel vibrations. The main motivation is the increased amplitudes in the neutron noise distributions recorded in ex- and in-core detectors that have been observed in recent years in Siemens pre-Konvoi type of pressurized water reactors. Several potential explanations have been put forward, but no definitive conclusions could yet be drawn. Among others, changes in fuel assemb

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15

Yalçın, Barıs Can, Muhammet Balcılar, and Ahmet Koyun. "Design and Implementation of Kalman Filter for Fuel Pipe Damping Test Machine Working Based on Variable Frequency Vibration Principle." Measurement and Control 50, no. 9-10 (2017): 199–205. http://dx.doi.org/10.1177/0020294017738196.

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Fuel pipes popularly used in automotive industry applications carry fuel from the fuel tank to the engine and work under variable vibrations having different magnitude and frequency parameters due to the engine’s rotation frequency and road profile’s spontaneous change. Considering that the transfer of the fuel to the engine in the desired way has a crucial importance on the driving performance, any problem that may exist because of the vibrations cannot be acceptable in the pipe assembly. Because of this reason, all manufactured fuel pipes have to be well tested in terms of some industrial st

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16

Reinhardt, A. K., J. R. Kadambi, and R. D. Quinn. "Laser Vibrometry Measurements of Rotating Blade Vibrations." Journal of Engineering for Gas Turbines and Power 117, no. 3 (1995): 484–88. http://dx.doi.org/10.1115/1.2814121.

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One of the most important design factors in modern turbomachinery is the vibration of turbomachinery blading. There is a need for developing an in-service, noncontacting, noninterfering method for the measurement and monitoring of gas turbine, jet engine, and steam turbine blade vibrations and stresses. Such a technique would also be useful for monitoring rotating helicopter blades. In the power generation industry, blade failures can result in millions of dollars of downtime. The measurement of blade vibrations and dynamic stresses is an important guide for preventive maintenance, which can b

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17

Chionis, D., A. Dokhane, L. Belblidia, H. Ferroukhi, G. Girardin, and A. Pautz. "Development and verification of a methodology for neutron noise response to fuel assembly vibrations." Annals of Nuclear Energy 147 (November 2020): 107669. http://dx.doi.org/10.1016/j.anucene.2020.107669.

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18

Ferrari, Giovanni, Giulio Franchini, Luca Faedo, et al. "Nonlinear vibrations of a 3 × 3 reduced scale PWR fuel assembly supported by spacer grids." Nuclear Engineering and Design 364 (August 2020): 110674. http://dx.doi.org/10.1016/j.nucengdes.2020.110674.

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19

Kamkar, A., M. Abbasi, and O. Safarzadeh. "Modeling and simulation of neutron noise triggered by fuel assembly vibrations in 3D hexagonal geometry." Nuclear Engineering and Design 414 (December 2023): 112532. http://dx.doi.org/10.1016/j.nucengdes.2023.112532.

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20

Demazière, C., A. Mylonakis, P. Vinai, et al. "NEUTRON NOISE-BASED ANOMALY CLASSIFICATION AND LOCALIZATION USING MACHINE LEARNING." EPJ Web of Conferences 247 (2021): 21004. http://dx.doi.org/10.1051/epjconf/202124721004.

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A methodology is proposed in this paper allowing the classification of anomalies and subsequently their possible localization in nuclear reactor cores during operation. The method relies on the monitoring of the neutron noise recorded by in-core neutron detectors located at very few discrete locations throughout the core. In order to unfold from the detectors readings the necessary information, a 3-dimensional Convolutional Neural Network is used, with the training and validation of the network based on simulated data. In the reported work, the approach was also tested on simulated data. The s

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21

Tran, Hoai-Nam, Imre Pázsit, and Henrik Nylén. "Investigation of the ex-core noise induced by fuel assembly vibrations in the Ringhals-3 PWR." Annals of Nuclear Energy 80 (June 2015): 434–46. http://dx.doi.org/10.1016/j.anucene.2015.01.045.

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22

Torres, L.A., D. Chionis, C. Montalvo, A. Dokhane, and A. García-Berrocal. "Neutron noise analysis of simulated mechanical and thermal-hydraulic perturbations in a PWR core." Annals of Nuclear Energy 126 (December 3, 2018): 121–252. https://doi.org/10.5281/zenodo.1886859.

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KWU-PWR plants show a high level of neutron noise that usually represents added problems in their operation. The frequency region of interest is below 1 Hz, so that thermohydraulic oscillations seem to be one of the main reasons behind. Nevertheless, recently, the neutron noise has experienced an increase in its normalized root mean square that coincide in time with the introduction of a new design of fuel assembly. This fact points out that there should be some relationship between neutron noise spectral characteristics and fuel assemblies’ performance. In order to advance in understand

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23

Srinivasan, A. V., and D. G. Cutts. "Aerodynamically Excited Vibrations of a Part-Span Shrouded Fan." Journal of Engineering for Gas Turbines and Power 107, no. 2 (1985): 399–407. http://dx.doi.org/10.1115/1.3239740.

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The structural response of a part-span shrouded fan due to an aerodynamic excitation was measured using strain gages. The excitation was provided by means of a 4-lobed distortion screen mounted upstream of the rotor. Vibration measurements made with tuned and mistuned conditions at integral order speeds have been analyzed to determine the aeromechanical response charcteristics of the assembly. The results from the experimental investigation are presented and discussed.

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24

Rouchon, Amélie, Malkiel Vadée Le Brun, and Andrea Zoia. "ANALYSIS AND COMPARISON OF APOLLO3® AND TRIPOLI-4® NEUTRON NOISE SOLVERS." EPJ Web of Conferences 247 (2021): 21002. http://dx.doi.org/10.1051/epjconf/202124721002.

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Neutron noise analysis addresses the description of small time-dependent flux fluctuations in reactor cores, induced by small global or local perturbations of the macroscopic cross sections due to density fluctuations of the coolant, to vibrations of fuel elements, control rods, or structural materials. The general noise equations are obtained by assuming small perturbations around a steady-state neutron flux and by subsequently taking the Fourier transform in the frequency domain. Recently, new neutron noise solvers have been implemented in diffusion and transport theory in APOLLO3®, the mult

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25

Gad-el-Hak, Ibrahim, Njuki Mureithi, and Kostas Karazis. "Vibrations of PWR fuel assembly under axial coolant flow and oblique impingement of jet cross-flow from LOCA holes." Nuclear Engineering and Design 429 (December 2024): 113586. http://dx.doi.org/10.1016/j.nucengdes.2024.113586.

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26

Balaji Mariyappan, Livin J, Pradeep U, Sachin Pirabhu R, and Viswak V S. "IoT BASED DESIGN AND DEVELOPMENT OF SOLAR ASSISTED PESTICIDE SPRINKLER." international journal of engineering technology and management sciences 7, no. 3 (2023): 228–34. http://dx.doi.org/10.46647/ijetms.2023.v07i03.029.

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Pesticide spraying is an important agricultural task that preserves crops from pests, diseases, and insect infestation and controls weeds. This conventional sprayer causes user fatigue because of its huge and bulky construction. We make this design and fabrication of a model that is a solar sprinkler, this will ergonomically eliminate the back attachment of the sprayer, reducing the user's fatigue level. Solar panels generate electricity by converting sunlight into electrical energy. This energy is used to power the entire system and the energy is stored in a battery which can be used to power

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27

Wu, Licun, Daogang Lu, and Yu Liu. "Experimental Investigation on Flow-Induced Vibration of Fuel Rods in Supercritical Water Loop." Science and Technology of Nuclear Installations 2014 (2014): 1–9. http://dx.doi.org/10.1155/2014/769432.

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The supercritical water-cooled reactor (SCWR) is one of the most promising Generation IV reactors. In order to make the fuel qualification test for SCWR, a research plan is proposed to test a small scale fuel assembly in a supercritical water loop. To ensure the structure safety of fuel assembly in the loop, a flow-induced vibration experiment was carried out to investigate the vibration behavior of fuel rods, especially the vibration caused by leakage flow. From the experiment result, it can be found that: the vibration of rods is mainly caused by turbulence when flow rate is low. However, th

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28

Mensa-Wilmot, Graham. "Technology Focus: Bits and Bottomhole Assemblies (December 2020)." Journal of Petroleum Technology 72, no. 12 (2020): 52. http://dx.doi.org/10.2118/1220-0052-jpt.

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Achieving and sustaining performance drilling’s intended benefits - improved drilling efficiency with minimal down-hole tool failures and the associated reductions in project cycle time and operational costs - requires new protocols in drilling-system analysis. Drilling-system components [bits, reamers, bottomhole assemblies (BHAs), drive systems, drilling parameters, and hydraulics] must be analyzed independently for their relevance on the basis of application types and project challenges. Additionally, the drilling system must undergo holistic evaluations to establish functional compatibilit

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29

Sorokin, F. D., V. V. Perevezentsev, and E. S. Krutko. "The Effect of Spacer Grids on the Formation of Added Mass under the Bending Vibrations of a Fuel-Element Bundle in a Covered Fuel-Element Assembly of a VVER-440 Reactor." Journal of Machinery Manufacture and Reliability 48, no. 2 (2019): 104–10. http://dx.doi.org/10.3103/s1052618819020146.

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30

Forshaw, Matthew. "Case Study: Automated Stringer Detection Boosts Drilling Efficiency With Less Downtime." Journal of Petroleum Technology 74, no. 09 (2022): 39–43. http://dx.doi.org/10.2118/0922-0039-jpt.

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_ Horizontal drilling has evolved over decades to become a trusted well construction technique in mature oil-producing regions. However, many challenges remain in geologically complex drilling environments. One challenging drilling scenario arises when the drill bit encounters hard stringers interbedded within softer formations like sandstone. The sudden change in rock mechanics in moving from the formation to the stringer often results in deflection of the drill bit and a deviation in the well path known as a dogleg. The rapid directional changes caused by doglegs lower drilling efficiency by

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31

Carpenter, Chris. "Improvement Plan Using Fatigue Analysis Minimizes Jar Twistoff." Journal of Petroleum Technology 75, no. 12 (2023): 77–79. http://dx.doi.org/10.2118/1223-0077-jpt.

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_ This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 210723, “Service Quality Improvement Plan Using FEA Fatigue Analysis Minimizes Jar Twistoff in Challenging Applications,” by Chaouki Boufama, SPE, Baozhong Yang, and Sultan Alfaraedhi, Schlumberger, et al. The paper has not been peer reviewed. _ Jar twistoff is a well-known service quality issue for some applications, especially in relatively large borehole sizes such as 22 and 16 in. The jar is one of the weakest points in the drillstring because of moving parts, which include complex shapes, re

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32

Au-Yang, M. K., and B. Brenneman. "Flow-Induced Vibration Analysis of an Integral Economizer Once-Through Steam Generator." Journal of Pressure Vessel Technology 111, no. 4 (1989): 501–6. http://dx.doi.org/10.1115/1.3265708.

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The integral economizer once-through steam generator is a second-generation steam generator used in B&W’s 205-fuel assembly nuclear power plants. Besides having an integral economizer, this steam generator differs from the first generation units, sixteen of which have been operating with B&W’s 177 fuel assembly nuclear power plants for more than ten years, in having a much higher flow rate. This higher flow rate induces a correspondingly higher fluid-dynamic load on all of the steam generator internal components, particularly the tube bundle. This paper describes the flow-induced vibra

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33

Mensa-Wilmot, Graham. "Technology Focus: Bits and Bottomhole Assemblies (December 2022)." Journal of Petroleum Technology 74, no. 12 (2022): 67–68. http://dx.doi.org/10.2118/1222-0067-jpt.

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Drilling-efficiency improvements must guarantee consistent reductions in project cost. The industry continues to pursue this critical requirement through different approaches—rate of penetration (ROP) maximization or cycle-time improvement. Recent advancements in technology, drilling processes, and applications characterization have begun to crystallize the differences and implications of the two methods. Most importantly, these efforts also identify crucial requirements and considerations that must be resolved as the move toward drilling analytics and automation gathers momentum. Consideratio

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34

Choi, Young T., Norman M. Wereley, and Gregory J. Hiemenz. "Three-Axis Vibration Isolation of a Full-Scale Magnetorheological Seat Suspension." Micromachines 15, no. 12 (2024): 1417. http://dx.doi.org/10.3390/mi15121417.

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This study examines the three-axis vibration isolation capabilities of a full-scale magnetorheological (MR) seat suspension system utilizing experimental methods to assess performance under both single-axis and simultaneous three-axis input conditions. To achieve this, a semi-active MR seat damper was designed and manufactured to address excitations in all three axes. The damper effectiveness was tested experimentally for axial and lateral motions, focusing on dynamic stiffness and loss factor using an MTS machine. Prior to creating the full-scale MR seat suspension, a scaled-down version at o

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35

Kanareykin, Alexandr. "Friction and wear of elements of nuclear reactors." E3S Web of Conferences 402 (2023): 05024. http://dx.doi.org/10.1051/e3sconf/202340205024.

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Fuel elements (fuel rods) and spacer grids are the main elements of the fuel assembly of a nuclear reactor. Friction forces affect the strength of the fuel assembly at all stages of its life cycle. The paper presents methods and results of pre-reactor experimental studies of static and dynamic processes involving friction forces. These include the assembly of the fuel assembly at the manufacturer’s factory, hydrodynamic vibration of fuel rods and fretting corrosion in the “fuel cell” nodes of the spacing grid, movement of the control and protection system controls in the guide channels of the

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36

Kupriyanov, Ivan, and Anatoly Lukyanov. "Mathematical and Natural Modeling of Oscillations in Induction Motors with Static Rotor Eccentricity." System Analysis & Mathematical Modeling 5, no. 4 (2023): 425–41. http://dx.doi.org/10.17150/2713-1734.2023.5(4).425-441.

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The article discusses the issues of improving the quality of diagnostics of induction motors in the presence of static rotor eccentricity (uneven air gap). In the process of assembly and repair of an induction electric drive, violations of the manufacturing and assembly technology may occur, in particular, the displacement of the rotor axis relative to the stator axis. This defect can also occur when the rotor bearings are worn. When operating and repairing asynchronous electric motors according to the actual state, reliable diagnostic information plays an important role, in particular, on vib

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37

Zeman, Vladimír, and Zdeněk Hlaváč. "Prediction of the Nuclear Fuel Rod Abrasion in the Probability Sense." Applied Mechanics and Materials 821 (January 2016): 317–24. http://dx.doi.org/10.4028/www.scientific.net/amm.821.317.

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The paper deals with the upper and lower limits estimation of the friction work and fretting wear in the contact of nuclear fuel rods with fuel assembly (FA) spacer grid cells. The friction work is deciding factor for the prediction of the fuel rod cladding abrasion caused by FA vibration. Design and operational parameters of the FA components are understood as random variables defined by mean values and standard deviations. The gradient and three sigma criterion approach is applied to the calculation of the upper and lower limits of the friction work and fretting wear in particular contact su

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38

Chen, Sitong, Xueke Wang, and Tong Zhu. "Effect of Mechanical Vibration on the Durability of Proton Exchange Membrane Fuel Cells." Nanomaterials 13, no. 15 (2023): 2191. http://dx.doi.org/10.3390/nano13152191.

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To study the durability of proton exchange membrane fuel cells (PEMFCs), the experiments were performed by using a 300 h accelerated stress test under vibration and non-vibration conditions. Before and after chronic operation, the polarization curve, impedance spectra and cyclic voltammogram were measured at regular intervals. The voltage under vibration shows a small decline at the current density of 400 mA cm−2 and decreases quickly along the time in high current density. Meanwhile, the pavement vibration dramatically impacts the contact resistance of the membrane electrode assembly to the b

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39

Sychev, Yu A., A. N. Nazarychev, and G. V. Dyachenok. "Improving the Labor Safety of Mining Dump Truck Drivers by Reducing the Risk of Failure of the Functional Units of the Traction Electric Drive under Operating Conditions." Occupational Safety in Industry, no. 9 (September 2023): 52–58. http://dx.doi.org/10.24000/0409-2961-2023-9-52-58.

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The results are presented concerning the analysis of statistical data on failures of the functional units of traction electric drives of the mining dump trucks. It is established that the costs of failure recovery in the synchronous generator are higher than in a control cabinet and an asynchronous traction motor, and one of the causes of defects in the bearing assembly of the generator is the effect of self-supporting axial shock vibrations. And in addition to the effect of vibrations on the reliability of the synchronous generator, they are also the cause of the development of professional n

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40

Pauzi, Anas Muhamad, Hector Iacovides, and Andrea Cioncolini. "Pragmatic modelling of axial flow-induced vibration (FIV) for nuclear fuel rods." IOP Conference Series: Materials Science and Engineering 1285, no. 1 (2023): 012001. http://dx.doi.org/10.1088/1757-899x/1285/1/012001.

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Abstract Flow-induced vibration (FIV) at the spacer grid in the fuel assembly of a Light Water Reactor (LWR) is the leading cause of fuel failure. This project aims to produce a simulation benchmark on the experimental campaign at MACE on axial FIV of a cantilever beam in an annular tube, that mimics the configuration and environment of a typical LWR. The nuclear fuel rod, which consists of fuel pellets filled in Zirconium alloy cladding is modelled in the experiment as a steel rod filled with lead shots that closely approximates the filling density of the fuel pellet. To reduce the complexity

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41

Li, Delun, Lou Zhong, Wei Zhu, Zhipeng Xu, Qirong Tang, and Wenhao Zhan. "A Survey of Space Robotic Technologies for On-Orbit Assembly." Space: Science & Technology 2022 (September 1, 2022): 1–13. http://dx.doi.org/10.34133/2022/9849170.

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The construction of large structures is one of the main development trends of the space exploration in the future, such as large space stations, large space solar power stations, and large space telescopes. It is one of important development tendency, which aims to make full use of space robots to assemble space structures autonomously in the aerospace industry. Considering that on-orbit assembly is an effective method to solve the problem of construction of large-scale spatial structures, it is necessary to motivate and facilitate the research of space robotics technologies for on-orbit assem

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42

Song, Sixuan, Tianxin Zhang, Zhongxing Wang, Renzhong Pei, Shichu Yan, and Kai Chen. "Full waveform vibration and shock measurement tool for measurement-while-drilling." AIP Advances 12, no. 8 (2022): 085114. http://dx.doi.org/10.1063/5.0090505.

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The bottom hole assembly during the drilling process is prone to fatigue and damage under the influence of alternating stress, particularly the drill bit and bottom part of the bottom hole assembly. The vibration and shock data are normally used to estimate the working status of the drill collars and for data post-processing of a particular logging method. The recent developments in drilling technology have increased investigations into continuous vibration and shock information measurement. However, existing tools store only the results of signal processing and cannot determine the raw full w

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Azoulay, Michel, Alexander Veprik, Vladimir Babitsky, and Neil Halliwell. "Distributed Absorber for Noise and Vibration Control." Shock and Vibration 18, no. 1-2 (2011): 181–219. http://dx.doi.org/10.1155/2011/617589.

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An approach to a wide-band frequency passive vibration attenuation is introduced in this paper. This aims to suppress noise and vibration of extended multimode objects like plates, panels and shells. The absorber is arranged in the form of a single-layer assembly of small inertial bodies (balls) being distributed and moulded within the light visco-elastic media (e.g. silicone resin). The absorber as a whole is embedded into object face covering the critical patches of the system surface. For the purpose of characterization, the authors introduced the complex frequency response function relatin

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Liu, Zhe, Mingjie Wang, Pengbo Guo, Dawei Gao, and Yunkai Gao. "Numerical and Experimental-Based Framework for Fuel Cell System Fatigue Analysis in Frequency Domain." Machines 13, no. 1 (2024): 18. https://doi.org/10.3390/machines13010018.

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New energy vehicles have emerged as a prominent focus in the automotive industry. This study develops a comprehensive modeling specification for fuel cell systems in new energy vehicles and establishes a framework for fatigue life analysis in the frequency domain. First, a finite element model of the fuel cell system was created in accordance with established standards, followed by grid convergence analysis and grid quality correction to enhance model accuracy. Next, random vibration analysis was performed to determine the root mean square (RMS) stress distribution of the fixed plate assembly

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Wei, Yi, Yanfeng Xing, Xiaobing Zhang, Ying Wang, Juyong Cao, and Fuyong Yang. "A Review of Sealing Systems for Proton Exchange Membrane Fuel Cells." World Electric Vehicle Journal 15, no. 8 (2024): 358. http://dx.doi.org/10.3390/wevj15080358.

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The sealing technology of proton exchange membrane fuel cells (PEMFCs) is a critical factor in ensuring their performance, impacting driving safety and range efficiency. To guarantee the safe operation of PEMFCs in complex environments, it is essential to conduct related sealing research. The structure of the fuel cell sealing system is complex, with components in close contact, and identifying factors that affect its sealing performance is crucial for the development and application of the cells. This paper briefly describes the sealing mechanism of PEMFCs and introduces four typical sealing

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Dyk, Štěpán, and Vladimír Zeman. "Bifurcations in Mathematical Model of Nonlinear Vibration of the Nuclear Fuel Rod." Applied Mechanics and Materials 821 (January 2016): 207–12. http://dx.doi.org/10.4028/www.scientific.net/amm.821.207.

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The paper deals with nonlinear phenomena that occurs during vibration of nuclear fuel rod (FR). The FR is considered as a system consisting of two impact-interacting subsystems FR cladding (zircalloy tube) and fuel pellets stack placed inside FR cladding. Between both subsystems, there is a small radial clearance. The FR is bottom-end-fixed, and at eight equidistant levels, the FR cladding is supported by spacer grids (SG). Both subsystems are modelled by means of finite element method for one-dimensional Euler-Bernoulli continua. During fuel assembly (FA) motion caused by pressure pulsations

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Santarelli, F. J., A. F. Marsala, M. Brignoli, E. Rossi, and N. Bona. "Formation Evaluation From Logging on Cuttings." SPE Reservoir Evaluation & Engineering 1, no. 03 (1998): 238–44. http://dx.doi.org/10.2118/36851-pa.

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Abstract This paper presents an overview of a vast research project named Formation Evaluation 2000 that was undertaken by Agip SpA and was aimed at characterizing in real time the formations encountered during drilling by the mean of measurements on drill chips. To date, the project has demonstrated the feasibility to obtain representative values of the P and S wave velocities, rock strength and deformability, permeability, porosity, density, residual fluid content and saturation. Further work is underway in order to gain access to the pore size distribution, the thermal expansion and the con

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Yang, Chen, Yan Guo, Xiao Hu, and Yanhong Zhang. "A New Experimental Method for the Nonlinear Modal Parameter Identification of a Pressurized Water Reactor Fuel Assembly." Science and Technology of Nuclear Installations 2023 (May 25, 2023): 1–19. http://dx.doi.org/10.1155/2023/8892196.

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Establishing a dynamic model that accurately describes a realistic pressurized water reactor (PWR) fuel assembly is crucial to precisely evaluate the mechanical properties of the fuel assembly in seismic or loss of coolant accidents (LOCAs). The pluck test combined with the logarithmic decrement method has been widely applied in previous studies to extract fundamental modal parameters to calibrate dynamic models. However, most previous investigations focused on the first cycle of free vibration, which is strongly affected by stiction, baseline shift, drop conditions, and high-order mode interf

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Lee, Kang Hee, Heung Seok Kang, Kyung Ho Yoon, and Kee Nam Song. "Experimental Study on the Fluctuating Pressure Acting on a 5x5 Partial Fuel Assembly in a Parallel Flow." Key Engineering Materials 326-328 (December 2006): 1657–60. http://dx.doi.org/10.4028/www.scientific.net/kem.326-328.1657.

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A 5x5 partial fuel assembly was used for a comparative design evaluation test of a newly developed spacer grid from a mechanical/hydraulic vibration aspect. Axial flow pattern along this rod bundle in the test was very complex due to the intermediate spacers and the mixing vane; Understanding of this flow field of a dynamic pressure is a preliminary step for a theoretical analysis of a vibratory behavior of a partial fuel assembly. Since a fluctuating pressure induced by the randomly-varying flow turbulence cannot be accurately predicted by an analysis alone, it has to be measured directly on

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Vassenden, Frode, Torleif Holt, Amir Ghaderi, and Arild Solheim. "Foam Propagation on Semi-Reservoir Scale." SPE Reservoir Evaluation & Engineering 2, no. 05 (1999): 436–41. http://dx.doi.org/10.2118/58047-pa.

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Summary Foam propagation in co-injection of gas and surfactant solution has been studied in a 10-m-long flow apparatus, equipped with pressure ports and fluid sampling valves for every 1 m. The data have been compared to the results of a core scale foam flooding experiment with the same porous medium. The propagation experiments on the 10 m scale revealed that the foam front propagated significantly slower than the injected fluid front. It appeared that foam propagation was not limited by surfactant transport, but was delayed due to the presence of oil in the porous medium. The experiments hav

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