Gotowe bibliografie tematyczne / Hydraulic lock structures

Gotowa bibliografia na temat „Hydraulic lock structures”

Autor: Grafiati
Data publikacji: 4 czerwca 2021
Data aktualizacji: 20 lutego 2023

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Artykuły w czasopismach na temat "Hydraulic lock structures"

1

Frishter, Lyudmila, i Alexander Isaikin. "Pre-design inspection of the long-term operation lock". E3S Web of Conferences 97 (2019): 05018. http://dx.doi.org/10.1051/e3sconf/20199705018.

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For hydraulic structures of long-term operation, assessments of operating life, limit states and safety of structures are required. The design of reconstruction, restoration of functional parameters of structures is preceded by pre-design inspections of the structure. The relevance of pre-design inspections is the need to assess the characteristics of technical and operating state of the structure, to describe reasons for deviations from design parameters of operation, to obtain recommendations to justify the design of reconstruction, restoration or repair of structures. This article presents the results of a pre-design inspection of a high-pressure lock on the Ufa River. An analysis of the complex of effects on the stress-strain state of the structure, static calculation of the lock chamber wall is carried out considering design changes during the operation period – installation of additional buttresses, vibrodynamic inspection and calculation. The obtained calculation results are compared with data of instrumentation equipment. The purpose of the inspection is to obtain a preliminary design assessment of technical state of the hydraulic structure – lock, including an assessment of the possibility of further operation. The practical significance of the paper is determined by the fact that the results obtained can serve as baseline data for a design of reconstruction, restoration of a hydraulic structure and recommendations for ensuring its long-term safe operation.
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Riveros, Guillermo A., i Elias Arredondo. "Predicting Future Deterioration of Hydraulic Steel Structures with Markov Chain and Multivariate Samples of Statistical Distributions". Journal of Applied Mathematics 2014 (2014): 1–8. http://dx.doi.org/10.1155/2014/360532.

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Combined effects of several complex phenomena cause the deterioration of elements of steel hydraulic structures on the nation’s lock systems: loss of protective systems, corrosion, cracking and fatigue, impacts, and overloads. This paper presents examples of deterioration of steel hydraulic structures. A method for predicting future deterioration based on current conditions is also presented. This paper also includes a procedure for developing deterioration curves when condition state data is available.
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Syvko, Ivan, Rudolf Syvko, Anatoliy Selimov, Volodymyr Tytarenko, Liudmyla Zharko i Oleg Fesenko. "Peculiarities of structures inspection by the example of a three-chamber navigation lock in Zaporizhzhia city". ACADEMIC JOURNAL Series: Industrial Machine Building, Civil Engineering 2, nr 51 (12.10.2018): 132–38. http://dx.doi.org/10.26906/znp.2018.51.1304.

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Peculiarities of structures of hydro technical structures technical condition are considered. The problem concerning normative documentation on the inspection of hydraulic structures is considered, and the absence of standards for the inspection of this type structures is revealed. The issue of hydraulic structures inspection by the example of a three-chamber lockin Zaporizhzhia city is considered. The issue of the deformed state according to observations of past years are considered. The recommendations for the further exploitation, repair and completion of reconstruction of a three-chamber lockin Zaporizhzhia are given.
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Thomas and, Luis, i Beatriz Marino. "Lock-Exchange Flows in Non-Rectangular Cross-Section Channels". Journal of Fluids Engineering 126, nr 2 (1.03.2004): 290–92. http://dx.doi.org/10.1115/1.1677475.

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Lock-exchange flows driven by density differences in non-rectangular cross-section channels are investigated in situations that resemble estuaries, navigation canals and hydraulic engineering structures. A simple analytical model considering stratified flows suggests practical relationships corroborated by results of laboratory experiments carried out in a straight channel of triangular cross-section.
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Škvarka, Juraj, Emilia Bednárová, Ivan Slávik i Monika Takácová. "Monitoring of Elastic Deformations of the Hydraulic Structure Gabcíkovo". IOP Conference Series: Earth and Environmental Science 906, nr 1 (1.11.2021): 012106. http://dx.doi.org/10.1088/1755-1315/906/1/012106.

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Abstract The settlement and its calculations and monitoring are among the main factors influencing the structure and operability of hydraulic structures. Our paper focuses on the hydraulic structure Gabcíkovo which consists of the hydropower plant with an installed capacity of 720 MW and two navigation locks to ensure international ship transportation. Conventional geodetic methods of classical or very precise leveling with state-of-the-art measuring instruments are currently used to monitor deformations on navigation locks of hydraulic structure Gabcíkovo. In their subsoil, there are gravelly sediments to a depth of about 400 m. Under the gravel sediments, there are Neogene clays and silts. From the beginning of construction, deformations are measured on all structures using special tachymetric devices to monitor the elastic displacements. The obtained measured values are then processed in time dependences and compared with the limit values. During the current almost 30-year operation of the navigation locks, filling and emptying cycles, loading and unloading of the subsoil can be counted in the tens of thousands. The impact of the long-term operation, but especially the current innovation and modernization of navigation locks, aimed at increasing the safety and intensity of transport brings new knowledge and experiences. During the implementation of required improvement related to this project, the right navigation lock is empty for more than a year. The created technical conditions made it possible to monitor the influence of long-term unloading on the subsoil on the vertical displacements in detail. This unusual load condition is a motivation to present the results of measurements in the presented paper.
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Levachev, Stanislav Nikolaevich, i Tat’yana Sergeevna Fedorova. "Developmentof the safety monitoring system of hydraulic structuresof the Moscow canal". Vestnik MGSU, nr 5 (maj 2015): 73–85. http://dx.doi.org/10.22227/1997-0935.2015.5.73-85.

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The basis of the enterprise “Moscow Canal” in its present state is the canal Moscow - Volga constructed in 1937. Today “Moscow Canal” is the biggest water transport and water industry complex. It has 10 filiations and solves a substantial complex of tasks. One of the most important part of hydraulic structures operation is their observation or monitoring of their safety, which gives us timely and adequate picture of their work and helps to forecast and prevent emergency situations.The article is devoted to the development of the monitoring system of the water- works of the Moscow canal beginning with the moment of its construction to the present time, the observation analysis of the condition of the walls of canal locks chambers, lock no. 2 where destructive processes in the operation of the walls were first discovered and different methods of liquidation of their development were made. The main problems in the field of monitoring of hydrotechnical structures of the Moscow canal are identified basing on the analysis of the observations.
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Liu, Ming, Qing Zhang i Meng Gong. "Research on Improving Friction Compensation of Large Structure's Weighing System". Advanced Materials Research 255-260 (maj 2011): 551–55. http://dx.doi.org/10.4028/www.scientific.net/amr.255-260.551.

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Large structures weighing systemis upgrading the structure simultaneously using several jacks. After structure leaves the ground, the hydraulic control check valve is used for hydraulic lock, and pressure sensor that under each jack measures the jack cavity pressure. Data is collected by PLC system to obtain the force situation of each jack. With the moment of inertia calculation, center of gravity coordinates of the plane is obtained, the weighing system involves in the hydraulic system, control system, data acquisition and transmission. As the jack wall friction and the leakage factors, in the measuring process, pressure sensor reflects little, and measurement errors appear. In this research, experimental research data has been used to obtain empirical formula under varying pressures, error has also been corrected in weighing measurement system in order to get high precision weighing data. The results are in good agreement after comparing this theory with results measured by weight sensor.
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Bai, Jiawei, Chao Su, Heng Zhang i Shaopei Hu. "Structural Optimization Design of Ship Lock Heads on Soft Soil considering Time-Varying Effects of the Structure and Foundation". Mathematical Problems in Engineering 2021 (12.04.2021): 1–21. http://dx.doi.org/10.1155/2021/5517060.

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Over time, the uneven settlements of the structure and foundation are prominent in constructing ship lock heads on soft soil. These deformations endanger the safety of ship lock heads during construction. This research aimed to establish the ship lock head’s structural optimization procedure on soft soil, considering the time-varying effects of the structure and foundation. By comprehensively considering the linear viscoelastic creep of concrete and the elastoplastic consolidation characteristic of soft soil, a perfect time-dependent analysis method for the lock head on soft soil was proposed. Furthermore, a hybrid particle swarm optimization, enhanced whale optimization, and differential evolution (PSO-EWOA-DE) algorithm was proposed to optimize thirty-four design variables of a lock head. With the minimal volume of the lock head as the optimization objective, the finite element model was established. In the optimization process, three types of constraints were evaluated. The result showed that the optimized design could reduce 10.45% of structure volume. Through comparing and analysing the maximum principle stresses and vertical displacements of the lock head before and after optimization, some conclusions were drawn. The optimization procedure proposed in this paper provides a new perspective for the structural optimization of hydraulic structures on soft soil.
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Kizar, Ahmed Naeem, i Riyadh Z. Azzubaidi. "Utilizing the Main Outfall Drain-Addalmage Lake System for Hydroelectric Power Generation". Journal of Engineering 25, nr 7 (1.07.2019): 104–17. http://dx.doi.org/10.31026/j.eng.2019.07.06.

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The basic idea of the Main Outfall Drain, MOD, was to construct a main channel to collect saline drained water of the irrigation projects within central and southern parts of Iraq and discharge it down to the Arabian Gulf. The MOD has a navigation lock structures near Addalmage Lake at station 299.4km. This structure is designed to ensure navigation within the MOD. The water level difference upstream the cross regulator and the downstream conjugation structure is about 9m. This head difference can be used to generate electrical power by constricting a low head power plant. This study aimed to utilize the head difference in navigation lock structures for power generation. Different operation condition and locations plants were examined. Hydrologic and hydraulic simulations were used to analyze the system of the MOD-Addalmage Lake system. Results showed that the water level are kept below the dike level along the reaches in the all alternatives and the maximum average annual power generated vary between 3.41MW to 5.55MW depending on the selected alternative of operation and the site of the plant
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Sonebi, M., i K. H. Khayat. "Bétons à haute performance pour fabriquer des panneaux destinés à réparer des structures submergées". Canadian Journal of Civil Engineering 20, nr 4 (1.08.1993): 650–59. http://dx.doi.org/10.1139/l93-082.

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The field of repair of submerged hydraulic structures (dams, stilling basins, lock chambers, and so forth) is becoming more and more important given the economic worth of such structures. Damage caused by abrasion can make it difficult to maintain such structures in service. The purpose of the study described in this paper was to develop durable high-performance concretes that can be used for manufacture of board for repair of abrasion-damaged surfaces. The board might also be placed on surfaces already repaired with colloidal concrete poured underwater. Two types of cement (Type 30 and Type 10) and two high-performance coarse aggregates (granite and dolomitic limestone) were used. The eight concrete mixes developed included a variety of additives and admixtures such as silica fume, steel fibre, latex, and superplasticizer. For precise characterization of the mixes, hydraulic abrasion tests, compressive strength tests, and freeze–thaw cycle resistance tests were performed. In addition, shrinkage, thermal expansion coefficient, and permeability of the concretes were measured; in some cases, the board might be subject to freeze–thaw cycles in structures partially emptied for repair or maintenance. Results show that high-performance concretes with very low water: cement ratio, good workability, and improved freeze–thaw cycle resistance can be manufactured. Concretes made with Type-30 cement, silica fume, and granite or limestone aggregate offer excellent hydraulic abrasion resistance (depth of erosion on the order of 1 mm after 72 h), compressive strength greater than 115 MPa after 91 days, and a freeze–thaw durability factor of more than 100%. Key words: abrasion, concrete, durability, steel fibre, silica fume, freeze–thaw cycle, latex, board, underwater repair.
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Rozprawy doktorskie na temat "Hydraulic lock structures"

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Zigic, Sasha, i n/a. "A Methodology to Calculate the Time-Varying Flow Through a Hydraulic Structure Connecting Two Water Bodies". Griffith University. School of Engineering, 2005. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20060111.145655.

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Hydraulic lock structures have been used for hundreds of years to control and maintain water levels in waterways. The most common are gated water regulation structures used to catch and divert water, and form an essential and critical part of many flood control and agricultural schemes. Although there are clear economic advantages to building the structures, they can contribute to major water quality problems for the waterways they influence (i.e. increased residence times and a change in mixing ability). Further, in most cases, the methods previously used to assess how the structures and their operations influence the flow regimes between the two connected systems were limited, thus hydraulic designers rely on simple formulations, existing literature and experience. Consequently, the objectives of this thesis were to undertake a detailed field study and develop a methodology and computer simulation tool to calculate the flow through a hydraulic structure connecting two water bodies so that future designs can be undertaken based upon sound knowledge. To demonstrate the outcomes of this thesis, the methodology and model were applied to an existing hydraulic structure (referred to as Structure C). Structure C is used to connect and exchange water between the tidally dominated section of the Nerang River estuary and an artificial lake system (Burleigh Lakes) on the Gold Coast, Australia. The gates of this structure open four times each day (once during each semi-diurnal tidal phase) and remain open for a period of 2 hours, allowing alternative and partial exchange between the two water bodies. To gain a better understanding of the dynamics of each waterbody under the influence of the structure, a series of detailed field experiments were initially undertaken to understand and quantify the exchange of water and its mixing ability. Tide gauges deployed within the lake indicated a water level change during each opening of up to 22 cm, equating to 413,600 m3 of water entering the lake over the 2 hour discharge period. Salinity profiles showed that the structure permitted the exchange of saline and freshwater between the two systems, during each tidal cycle, in turn maintaining the lake system as a saline (brackish environment). However, the field study also revealed that the controlled exchange of water between the systems perpetuated a permanently stratified environment on both sides of the structure. To simulate the flow dynamics influenced by Structure C, new routines were incorporated into an existing hydrodynamic model (BFHYDRO) within the model's grid and computational code, as part of this thesis. To achieve this, the flow in and out of the hydraulic structure cell (used to represent the hydraulic structure's location within the model grid) was calculated entirely from the local water level gradients on either side of the structure at each time-step, and not prescribed. This was found to be essential for complex tidally-dominated systems, such as the Nerang River. Routines were also developed to replicate the opening and closing times of the gates. Following the development of the methodology, the hydraulic structure cells were tested and applied to simulate the flow through Structure C and the complex exchange between the estuary and lake, in 2 and 3-dimensions. Tests indicated that the opening and closing times of the gates and the calibration of the discharge coefficient (which forms part of the broad-crested weir formula) were the most sensitive parameters to ensure the correct volume of water exchange between the two systems. Statistically, the model-predicted results compared very well with available surface elevation data within the estuary and lake, and thus, quantified the ability of the hydraulic structure cells to simulate the flux between the estuary and lake for each opening. Following the model validation process, results from the existing configuration were compared with hypothetical design alternatives and are documented herein. Further, part of the thesis also explored a practical and effective computer based learning strategy to introduce and teach hydrodynamic and water quality modelling, to the next generation of undergraduate engineering students. To enhance technology transfer a computer based instructional (CBI) aid was specifically developed to assist with the setup, execution and the analysis of models' output, in small easy steps. The CBI aid comprised of a HTML module with links to recorded Lotus Screen cam movie clips. The strategy proved to be a useful and effective approach in assisting the students to complete the project with minimum supervision, and acquire a basic understanding of water quality modelling. Finally, it is anticipated that this new modelling capability and the findings detailed herein will provide managers with a valuable tool to assess the influence of these structures on water circulation for present and future operations within the region. This model can also be set up at other sites to pre-assess various design configurations by predicting changes in current flows, mixing and flushing dynamics that a particular design might achieve, and assist with the selection process before the final selection and construction.
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Zigic, Sasha. "A Methodology to Calculate the Time-Varying Flow Through a Hydraulic Structure Connecting Two Water Bodies". Thesis, Griffith University, 2005. http://hdl.handle.net/10072/365304.

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Hydraulic lock structures have been used for hundreds of years to control and maintain water levels in waterways. The most common are gated water regulation structures used to catch and divert water, and form an essential and critical part of many flood control and agricultural schemes. Although there are clear economic advantages to building the structures, they can contribute to major water quality problems for the waterways they influence (i.e. increased residence times and a change in mixing ability). Further, in most cases, the methods previously used to assess how the structures and their operations influence the flow regimes between the two connected systems were limited, thus hydraulic designers rely on simple formulations, existing literature and experience. Consequently, the objectives of this thesis were to undertake a detailed field study and develop a methodology and computer simulation tool to calculate the flow through a hydraulic structure connecting two water bodies so that future designs can be undertaken based upon sound knowledge. To demonstrate the outcomes of this thesis, the methodology and model were applied to an existing hydraulic structure (referred to as Structure C). Structure C is used to connect and exchange water between the tidally dominated section of the Nerang River estuary and an artificial lake system (Burleigh Lakes) on the Gold Coast, Australia. The gates of this structure open four times each day (once during each semi-diurnal tidal phase) and remain open for a period of 2 hours, allowing alternative and partial exchange between the two water bodies. To gain a better understanding of the dynamics of each waterbody under the influence of the structure, a series of detailed field experiments were initially undertaken to understand and quantify the exchange of water and its mixing ability. Tide gauges deployed within the lake indicated a water level change during each opening of up to 22 cm, equating to 413,600 m3 of water entering the lake over the 2 hour discharge period. Salinity profiles showed that the structure permitted the exchange of saline and freshwater between the two systems, during each tidal cycle, in turn maintaining the lake system as a saline (brackish environment). However, the field study also revealed that the controlled exchange of water between the systems perpetuated a permanently stratified environment on both sides of the structure. To simulate the flow dynamics influenced by Structure C, new routines were incorporated into an existing hydrodynamic model (BFHYDRO) within the model's grid and computational code, as part of this thesis. To achieve this, the flow in and out of the hydraulic structure cell (used to represent the hydraulic structure's location within the model grid) was calculated entirely from the local water level gradients on either side of the structure at each time-step, and not prescribed. This was found to be essential for complex tidally-dominated systems, such as the Nerang River. Routines were also developed to replicate the opening and closing times of the gates. Following the development of the methodology, the hydraulic structure cells were tested and applied to simulate the flow through Structure C and the complex exchange between the estuary and lake, in 2 and 3-dimensions. Tests indicated that the opening and closing times of the gates and the calibration of the discharge coefficient (which forms part of the broad-crested weir formula) were the most sensitive parameters to ensure the correct volume of water exchange between the two systems. Statistically, the model-predicted results compared very well with available surface elevation data within the estuary and lake, and thus, quantified the ability of the hydraulic structure cells to simulate the flux between the estuary and lake for each opening. Following the model validation process, results from the existing configuration were compared with hypothetical design alternatives and are documented herein. Further, part of the thesis also explored a practical and effective computer based learning strategy to introduce and teach hydrodynamic and water quality modelling, to the next generation of undergraduate engineering students. To enhance technology transfer a computer based instructional (CBI) aid was specifically developed to assist with the setup, execution and the analysis of models' output, in small easy steps. The CBI aid comprised of a HTML module with links to recorded Lotus Screen cam movie clips. The strategy proved to be a useful and effective approach in assisting the students to complete the project with minimum supervision, and acquire a basic understanding of water quality modelling. Finally, it is anticipated that this new modelling capability and the findings detailed herein will provide managers with a valuable tool to assess the influence of these structures on water circulation for present and future operations within the region. This model can also be set up at other sites to pre-assess various design configurations by predicting changes in current flows, mixing and flushing dynamics that a particular design might achieve, and assist with the selection process before the final selection and construction.
Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Engineering
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Mancilla, Alarcón Cristhian A. "Hydrodynamic loadings and responses of a floating guardwall a fluid-structure interaction problem /". Master's thesis, Mississippi State : Mississippi State University, 2005. http://library.msstate.edu/content/templates/?a=72.

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Książki na temat "Hydraulic lock structures"

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Nakato, Tatsuaki. Unconventional energy sources for ice control at lock and dam installations. Hanover, N.H: U.S. Army Corps of Engineers, Cold Regions Research & Engineering Laboratory, 1992.

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Greimann, Lowell. REMR management systems--navigation structures condition rating procedures for tainter dam and lock gates. [Champaign, Ill.]: US Army Corps of Engineers, Construction Engineering Research Laboratories, 1995.

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Will, Kenneth M. Comparison of barge impact experimental and finite element results for the lower miter gate of Lock and Dam 26. [Vicksburg, Miss: U.S. Army Engineer Waterways Experiment Station, 1995.

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Kearney, F. Life-cycle analysis of corroding sheet pile structures for a lock and dam. Champaign, Ill: US Army Corps of Engineers, Construction Engineering Research Laboratory, 1986.

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Portland District U.S. Army Corps of Engineers. Teacher's guide to Bonneville Dam. Portland, Or: The District, 1993.

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Ebeling, Robert M. Soil-structure-foundation interaction analysis of new roller-compacted concrete, north lock wall at McAlpine Locks. Vicksburg, Miss: U.S. Army Engineer Waterways Experiment Station, 1997.

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Gomez, Jesus E. Development of an improved numerical model for concrete-to-soil interfaces in soil-structure interaction analyses. Vicksburg, Miss: U.S. Army Engineer Waterways Experiment Station, 1999.

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Bullock, Rupert E. REMR management systems--navigation and reservoir structures, condition rating procedures for concrete in gravity dams, retaining walls, and spillways. [Champaign, Ill.]: US Army Corps of Engineers, Construction Engineering Research Laboratories, 1995.

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Daniel, Ryszard, i Tim Paulus. Lock Gates and Other Closures in Hydraulic Projects. Elsevier Science & Technology Books, 2018.

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Daniel, Ryszard, i Tim Paulus. Lock Gates and Other Closures in Hydraulic Projects. Elsevier Science & Technology, 2018.

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Części książek na temat "Hydraulic lock structures"

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Daniel, Ryszard, i Tim Paulus. "Auxiliary Structures and Systems". W Lock Gates and Other Closures in Hydraulic Projects, 621–69. Elsevier, 2019. http://dx.doi.org/10.1016/b978-0-12-809264-4.00009-4.

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Daniel, Ryszard, i Tim Paulus. "Structural Types of Hydraulic Gates". W Lock Gates and Other Closures in Hydraulic Projects, 35–282. Elsevier, 2019. http://dx.doi.org/10.1016/b978-0-12-809264-4.00003-3.

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Daniel, Ryszard, i Tim Paulus. "Structural Analysis☆". W Lock Gates and Other Closures in Hydraulic Projects, 461–530. Elsevier, 2019. http://dx.doi.org/10.1016/b978-0-12-809264-4.00007-0.

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Xu, W., Q. Ning, C. Li i Y. Shi. "Study on the influence of the miter gate thrust on the lock head structure". W Progress in Civil, Architectural and Hydraulic Engineering IV, 691–96. CRC Press, 2015. http://dx.doi.org/10.1201/b19383-141.

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Streszczenia konferencji na temat "Hydraulic lock structures"

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Voortman, Hessel, Tom Wijdenes, Henry Tuin, Wim van der Stelt, David van Goolen, Pieter van Lierop, Leon Lous i Wim Kortlever. "Hydraulic loads on a large lock gate". W ICE Coasts, Marine Structures and Breakwaters. ICE Publishing, 2018. http://dx.doi.org/10.1680/cmsb.63174.1267.

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Daniel, Ryszard A. "Control of Fatigue in Hydraulic Steel Structures". W IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2022. http://dx.doi.org/10.2749/prague.2022.1234.

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<p>Hydraulic Structures, like lock gates, movable river weirs, tide and flood barriers, are subject to varying loads that may lead to fatigue damage. These loads are primarily generated by differential water heads, but also by waves, gate drive forces, vibrations in flow and other actions. The existing guidelines in the field of fatigue did not sufficiently cover the specific operation conditions and demands that apply to hydraulic structures. An improvement in this matter was the investigation report by a Working Group of PIANC, the International Association for Waterborne Infrastructure. The intention of this paper is to describe the practices followed by designers, constructors and maintenance crews of hydraulic structures with respect to fatigue control; and to evaluate the applicability of existing codes and regulations in this regard. The discussed subject constitutes a challenge for both existing and prospective hydraulic steel structures.</p>
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Fattor, Claudio, Daniel Bacchiega i Santiago Arrigoni. "Hydrodynamic forces on the valves of the transfer system of the third set of locks of the Panama Canal". W 8th IAHR International Symposium on Hydraulic Structures ISHS2020. The University of Queensland, 2020. http://dx.doi.org/10.14264/uql.2020.596.

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Daniel, Ryszard A., i Timothy M. Paulus. "Handling Accidents and Calamities in Hydraulic Structures". W IABSE Congress, New York, New York 2019: The Evolving Metropolis. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2019. http://dx.doi.org/10.2749/newyork.2019.2181.

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<p>Hydraulic closures in dams, navigation locks and flood barriers belong to the most heavily loaded structures built by people. While ensuring their sufficient strength is the main engineers’ concern, one must also be prepared to adequately handle their failures. Identifying and reducing the risks of failures is an issue of wider scope than structural analysis alone. Once an accident happens, proper investigations, handling the losses and planning the repair become primary goals. This paper gives a general guidance on these issues reflecting the European (mainly Dutch) and American practice. The discussion includes both handling the situations immediately after the accidents, and the choice between repair and replacement of a damaged structure. Accidents are infrequent events of very diverse causes and consequences, therefore this discussion has an engineering rather than statistical character.</p><p>Both authors contributed to resolving accidents and failures of hydraulic structures, in the roles varying from investigation or design leader to repair manager. They were also consulted or made part of crisis teams in a number of other so-called “upset events”. This paper combines the highlights of their own experience and the practices being followed by the waterway administrations in the USA and the Netherlands. The selected examples are also from these countries, but can be seen as reflecting issues and concerns anywhere.</p>
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Harkness, Alexander W., i Richard E. Schwirian. "An Efficient Finite Element Method for the Representation of Fluid Structure Interaction in Large Structural Transient Dynamic Analyses". W ASME 1998 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/imece1998-0997.

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Abstract A finite element model method was developed to evaluate fluid structure interaction between core support structures and reactor coolant during rapid Loss Of Coolant Accident (LOCA) conditions in Pressurized Water Reactors (PWR’s). The hydraulic behavior of the reactor coolant was modeled using a series of contained fluid elements linked to the structural elements using linear constraint equations. An advantage of this method is the significant reduction in the number of contained fluid elements required to accurately represent the fluid structure interaction. A large volume of fluid may be modeled by a single contained fluid element without compromising detail in the finite element representation of the structure. This three-dimensional finite element method represents an expansion of the two-dimensional methods presented by Riddell and Schwirian (1983). To provide verification of the method, finite element analysis results produced for a benchmark analysis were compared directly to a series of hydraulic pressure pulse tests performed previously. The typical hydraulic pulse evaluated had a pressure ranging from 0 to 1200 psig with a duration of less than 40 msec. Good agreement was observed between test and analysis results.
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Chen, Song, Shengyong Li i Zhihua Zhang. "Study on Vehicle Instability Control Based on Hydraulic coordinator of Electronic Stability Program and Anti-lock Brake System". W Second International Conference on Mechanics, Materials and Structural Engineering (ICMMSE 2017). Paris, France: Atlantis Press, 2017. http://dx.doi.org/10.2991/icmmse-17.2017.72.

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Zhang, Yubin. "Numerical Analysis of Pressurized Thermal Shock in Reactor Pressure Vessel". W 2021 28th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/icone28-64737.

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Abstract One of the most important issues for the assessment of life time extension of a nuclear power plant is whether the Reactor Pressure Vessel (RPV) can maintain structural integrity under Pressurized Thermal Shock (PTS) phenomenon. The most critical scenario takes places during cold water injection in the cold legs after a postulated Loss of Coolant Accident (LOCA). In the present study, a deterministic method has been conducted. The thermal-hydraulic system analysis program CATHARE, the Computational Fluid Dynamics (CFD) software STAR-CCM+ and the mechanical structure analysis software ABAQUS are used to simulate the Small Break and Intermediate Break Loss of Coolant Accident (SB-LOCA and IB-LOCA). As a result, the SB-LOCA and IB-LOCA accident transients are both simulated and the thermal stratification during the injection is demonstrated. The analysis results give the lowest temperature of SB-LOCA under vertical injection. Because of the bigger injection flow rate, the thermal shock is severer in IB-LOCA than SB-LOCA. According to the mechanical structural analysis results from ABAQUS, the thermal stresses are mainly concentrated on the both sides of the bottom of the inlet nozzle and the beginning of the downcomer of Reactor Pressure Vessel (RPV).
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Pourgol-Mohammad, Mohammad, Ali Mosleh i Mohammad Modarres. "IMTHUA Methods for Thermal-Hydraulics Code Structure Uncertainty Assessment". W 16th International Conference on Nuclear Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/icone16-48075.

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A successful treatment of model uncertainty results in an expression of uncertainty that includes the true value at some stated level of confidence. Code structure uncertainties (model uncertainty) are a crucial source of uncertainty quantification for thermal-hydraulics (TH) system codes such as RELAP5, TRAC, and recently consolidated TRACE code. These codes are an assembly of models and correlations for simulation of physical phenomena and behavior of system component. In some cases there are alternative sub-models, or several different correlations for calculation of a single phenomenon of interest. There are also “user options” for choosing one of several models or correlations in performing a specific code computation. Dynamic characteristics of TH add more complexity to the code calculation, meaning for example, that specific code models and correlations invoked are sequence-dependent, and based certain (dynamic) conditions being satisfied. This paper discusses the techniques developed in the Integrated Methodology for Thermal-Hydraulics Uncertainty Analysis (IMTHUA), specifically for the treatment of uncertainties due to code structure and models. The methodology comprehensively covers various aspects of complex code uncertainty assessments for important accident transients. It considers the TH code structural uncertainties explicitly by treating internal sub-model uncertainties, and by propagating such model uncertainties in the code calculations (including uncertainties about input parameters.) Structural uncertainty assessment (model uncertainty) for a single model will be discussed by considering “correction factor”, “bias”, and also through sub-model output updating with available experimental evidence. In case of multiple alternative models, techniques of dynamic model switching, user controlled model selection, model mixing, and model maximization/minimization will be discussed. Examples from different applications including, Marviken test facility blowdown, LOFT LBLOCA and a typical PWR LOCA scenario calculations will be provided for greater clarification of the proposed techniques.
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Li, Shengqiang, Yin Xiong, Yalei Hao i Shengyao Jiang. "Scaling for Different Containment Passive Cooling Design Under LOCA Conditions". W 2013 21st International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/icone21-15143.

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The containment passive cooling feature is one important indicator for advanced Pressurize Water Reactors (PWRs). Several innovative passive cooling designs have been proposed in industries, such as double steel cooling structure (DSS) in AP1000, the Vertical Heat exchanger in VVER, the water cooling wall in High Temperature Reactor (HTR), and ice cooler in some Generation II PWR plants. A universal passive cooling experimental facility is under design and construction. The object of this facility is performance testing and optimization of new passive cooling facilities. Considering of the diverse characteristics of the different passive cooling system, include mechanism of heat and mass transfer, conditions for operation and facility structures, a theoretical scaling study is necessary to be applied before a technical design process. Some general passive cooling models were made based on existing industrial designs. To enhance the compatibility of these models and future designs, pivotal and common parameters for these passive cooling designs were provided by scaling study. The main test facility will be built based on these parameters. For every different design, special appurtenances will be added to the main facility to complete the test device for special purposes. Time scale, facility height and physical properties were the most important parameters for the main test facility. Heat transfer area ratio, hydraulic diameter, volume flow rate and wall thickness of DSS was defined for appurtenances design.
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Schmidt, Lasse, Anders H. Hansen, Torben O. Andersen i Henrik C. Pedersen. "An Analytic Approach to Cascade Control Design for Hydraulic Valve-Cylinder Drives". W 9th FPNI Ph.D. Symposium on Fluid Power. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/fpni2016-1521.

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Motion control design for hydraulic drives remains to be a complicated task, and has not evolved on a level with electrical drives. When considering specifically motion control of hydraulic drives, the industry still prefers conventional linear control structures, often combined with feed forward control and possibly linear active damping functionalities. However difficulties often arise due to the inherent and strong nonlinear nature of hydraulic drives, with the more dominant being nonlinear valve flow- and oil stiffness characteristics, and furthermore the volume expansion/retraction when considering cylinder drives. A widely used approach with electrical drives is state controlor cascade control, that may by successfully applied to manipulate the drive dynamics in order to achieve high bandwidths etc., due to the nearly constant parameter-nature of such drives. Such properties are however, unfortunately not present in valveoperated hydraulic drives. This paper considers a cascade control approach for hydraulic valve-cylinder drives motivated by the fact that this may be applied to successfully suppress nonlinearities. The drive is pre-compensated utilizing a pressure updated inverse valve flow relation, ideally eliminating the system gain variation, and the linear model equations for the pre-compensated system is used for the cascade control design. The cascade design does not utilize e.g. bode plots, root loci etc., and is based on an analytic approach, emphasizing the exact influence of each control parameter, resulting in an easily comprehensible control structure. Two versions of this cascade control approach is presented, with the first utilizing pressure-, piston velocity- and piston position feedback, and the second utilizing only pressure- and piston position feedback. The latter may be especially interesting in an industrial context, as this does not use the velocity feedback, which is rarely available here. Furthermore, the position control loop is designed analytically to guarantee a user defined gain margin. The proposed control design approach is verified through simulations, and results demonstrate the announced properties.
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