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Journal articles on the topic 'Hydraulic analysis'

Author: Grafiati

Published: 4 June 2021

Last updated: 11 September 2023

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1

Windisch, Étienne J. "The hydraulics problem in slope stability analysis." Canadian Geotechnical Journal 28, no. 6 (December 1, 1991): 903–9. http://dx.doi.org/10.1139/t91-107.

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Hydraulic pressures and forces are obtained on a typical slice, as used in current methods of slope stability analysis, under hydrostatic and flowing groundwater conditions. It is shown that current methods do not satisfy some basic hydraulics and soil mechanics principles. The effective normal stress on the lower boundary of a slice is shown to be underestimated, and the resultant hydraulic force is not accounted for adequately. Key words: effective stress, hydraulic pressure, hydraulic gradient, hydraulic force, slope stability.

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2

Wang, Huan Yun, Li Ma, and Xiu Fen Liu. "Analysis and Elimination of Common Faults of Hydraulic System." Advanced Materials Research 694-697 (May 2013): 601–4. http://dx.doi.org/10.4028/www.scientific.net/amr.694-697.601.

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In order to ensure the normal operation of the hydraulic system, the faults must be found and eliminated promptly and accurately. Most of the faults of hydraulic system don’t happen suddenly. generally, there are signs such as noise, vibration, lash, pollution and leakage etc.. If these phenomena can be found, controlled and eliminated promptly and properly, the system faults can be reduced accordingly. This paper introduces several common faults of hydraulic system and the elimination methods. which the hydraulics technicians can refer to.

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3

Zhong, Xiang Qiang, and Li Dong Liang. "Mechanical-Hydraulic Coupling Simulation for Hydraulic Excavator Working Mechanism." Advanced Materials Research 538-541 (June 2012): 494–97. http://dx.doi.org/10.4028/www.scientific.net/amr.538-541.494.

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Hydraulic excavator is a typical and complicated engineering machine by combination of mechanical, control and hydraulic system. It is very important for coupling analysis by use of multiple simulation tools. Hydraulic excavator mechanical model was constructed based on Pro/E 4.0. Virtual prototype of hydraulic excavator was finished by use of ADAMS interface function and carried on a lot of kinematics and dynamics simulation analysis. Hydraulic cylinder circuit was derivated based on ADAMS/Hydraulics. Working principle of bucket arm hydraulic cylinder was analyzed. Mechanical and hydraulic simulation of bucket rod hydraulic cylinder was finished. Bucket rod hydraulic cylinder velocity was obtained. Simulation results show coupling simulations have certain theory value and practical significance. They can provide evidence for trial and optimization of physical prototype.

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4

Verspuy, C., and A. S. Tijsseling. "Hydraulic ram analysis." Journal of Hydraulic Research 31, no. 2 (March 1993): 267–78. http://dx.doi.org/10.1080/00221689309498849.

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5

Bayon-Barrachina, Arnau, and Petra Amparo Lopez-Jimenez. "Numerical analysis of hydraulic jumps using OpenFOAM." Journal of Hydroinformatics 17, no. 4 (March 13, 2015): 662–78. http://dx.doi.org/10.2166/hydro.2015.041.

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The present paper deals with a hydraulic jump study, characterization and numerical modeling. Hydraulic jumps constitute a common phenomenon in the hydraulics of open channels that increases the shear stress on streambeds, so promoting their erosion. A three-dimensional computational fluid dynamics model is proposed to analyze hydraulic jumps in horizontal smooth rectangular prismatic open-air channels (i.e., the so-called classical hydraulic jump). Turbulence is modeled using three widely used Reynolds-averaged Navier–Stokes (RANS) models, namely: Standard k − ɛ, RNG k − ɛ, and SST k − ω. The coexistence of two fluids and the definition of an interface between them are treated using a volume method in Cartesian grids of several element sizes. An innovative way to deal with the outlet boundary condition that allows the size of the simulated domain to be reduced is presented. A case study is conducted for validation purposes (FR1 ∼ 6.10, Re1 ∼ 3.5·105): several variables of interest are computed (sequent depths, efficiency, roller length, free surface profile, etc.) and compared to previous studies, achieving accuracies above 98% in all cases. In the light of the results, the model can be applied to real-life cases of design of hydraulic structures.

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6

Perrin, O., S. Christophe, F. Jacquinod, and O. Payrastre. "VISUAL ANALYSIS OF INCONSISTENCIES IN HYDRAULIC SIMULATION DATA." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLIII-B4-2020 (August 25, 2020): 795–801. http://dx.doi.org/10.5194/isprs-archives-xliii-b4-2020-795-2020.

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Abstract. We present our contribution to the geovisualization and visual analysis of hydraulic simulation data, based on an interdisciplinary research work undertaken by researchers in geographic information sciences and in hydraulics. The positive feedback loop between researchers favored the proposal of visualization tools enabling visual reasoning on hydraulic simulated data so as to infer knowledge on the simulation model. We interactively explore and design 2D multi-scale styles to render hydraulic simulated data, in order to support the identification over large simulation domains of possible local inconsistencies related to input simulation data, simulation parameters or simulation workflow. Models have been implemented into QGIS and are reusable for other input data and territories.

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7

Nakaznoy, Oleg A., and Alexander A. Tsipilev. "On calculational analysis of suspensions with hydraulic springs." Izvestiya MGTU MAMI 16, no. 2 (January 18, 2023): 135–48. http://dx.doi.org/10.17816/2074-0530-105257.

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BACKGROUND: The information about application of hydraulic springs in suspension systems of tanks and self-propelled artillery weapons may be found in domestic scientific and nonfiction literature. In addition, machines, which prototypes were equipped with this type of suspension, are known. For instance, possibility of hydraulic suspension implementation was proven on the T-34 tank prorotype, whereas application of this type of suspension with heavy tanks gave the most prospectivity. Complication of sealing build-up with sufficient life span, development of technologies of metal springs strengthening and shutdown of heavy tanks development did not allowed hydraulic suspensions to become widespread. At present, they are not used at all, whereas methods of analytical calculation are not in public access, despite of the interest of a group of scientists. AIMS: Development of the method of determination of main parameters of suspensions with hydraulic springs and analysis of properties of the T-34-76 Soviet middle tank prototype hydraulic suspension from the point of modern theory of nonlinear suspension systems. METHODS: Justification and confidence of given dependencies for properties calculation, conclusions and recommendations are confirmed with application of strict mathematical apparatus of mechanics, hydraulics and thermodynamics as well as scientifically justified theoretical backgrounds. RESULTS: Historic data on liquids compressibility researches, method of analytical determination of main properties of hydraulic springs with various design schemes, allowing restoring of properties of suspensions of existing tracked vehicles, synthesizing properties of other suspensions and, moreover, estimating reasonability of properties of suspension with hydraulic springs, are presented in the article. According to the method, proposed in the article, properties of the hydraulic spring from the T-34-76 Soviet middle tank prototype, equipped with hydraulic suspension, were restored and analyzed. In addition, suspension properties for the same vehicle were synthesized and used for a comparative analysis. CONCLUSIONS: The information, presented in the article, is helpful for research engineers, interested in study of elastic behavior of liquids in case of their application in suspension systems, whereas the proposed method, allowing synthesis of reasonable properties of hydraulic springs, gives an opportunity to study the ride comfort of tank propotypes, equipped with hydraulic suspension, with a good quality and, moreover, to synthesize hydraulic springs properties according to the demands, given to a design engineer.

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8

Wang, Ling Hua, Pan Hua Ning, and Chao Gan. "Hydraulic Elastic Vibration Analysis of Hydraulic Turbine Blade." Advanced Materials Research 354-355 (October 2011): 631–35. http://dx.doi.org/10.4028/www.scientific.net/amr.354-355.631.

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This paper analyses quantitatively mechanism that hydraulic turbine runner blade tail produces Carmen vortex column, and the blade hydraulic elastic vibration which is produced by Carmen vortex column, also analyses the harms of blade hydraulic resonance, puts forward corresponding preventative measures. For the stable operation of large Francis hydraulic turbine, these measures have reference meaning.

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9

Guo, Xiao Le, Zhi Ming Wang, and Zhi Hui Long. "Hydraulics Analysis System for Extended Reach Drilling in China and its Application." Applied Mechanics and Materials 241-244 (December 2012): 1349–53. http://dx.doi.org/10.4028/www.scientific.net/amm.241-244.1349.

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The extended reach drilling (ERD) is being adopted widely as an effective and economical way of developing oilfields in China. But it also brought a series of technical difficulties because of its own characteristics. Some progresses were made after several years of hard work in China about Hydraulics for extended reach drilling, which included cuttings transport models and rules, precise model of circulating system pressure loss calculation, hole cleaning calculating models and monitoring method, hydraulic extended limit calculation model and analysis, hydraulics design and optimization method for ERD. Based on the above studies, the author finally developed a system of hole cleaning monitoring and hydraulics design and its risk analysis which could provide theoretical support and useful tool for engineering design and risk assess before drilling. These researches are helpful to ERD and have enriched the hydraulic theory of ERD.

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10

Schick, Tobias, Jochen Hörer, Klaus Ellenrieder, Karl-Heinz Blum, and Katharina Schmitz. "Sensitivity analysis of operating parameters in hydraulic systems with respect to the aging of hydraulic fluids." Tribologie und Schmierungstechnik 69, eOnly Sonderausgabe (November 18, 2022): 25–29. http://dx.doi.org/10.24053/tus-2022-0028.

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In this work, a novel oil aging test-rig based on a real hydraulic system is introduced. This device allows an accelerated fluid-aging rate under high hydraulic loads. Furthermore, it is possible to vary the operating parameters to evaluate the different factors that influence the aging behavior of hydraulic fluids. Oil samples, which are aged under different conditions, are analyzed using FTIR to estimate the rate of aging using the degradation process of Zinc dialkyl dithiophosphate (ZDDP). The results show a clear aging behavior dependent on different operating parameters in hydraulics. In addition to the degradation of ZDDP, the depletion of the phenolic antioxidant (AO) and the formation of a varnish film on metallic surfaces can be observed.

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11

Zhang, Zeng Meng, and Yong Jun Gong. "Design Analysis of Water Hydraulic Digital Valve." Applied Mechanics and Materials 101-102 (September 2011): 148–53. http://dx.doi.org/10.4028/www.scientific.net/amm.101-102.148.

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Lubrication and sealing are the key research points in water hydraulic technology. A better seal is provided by the structure form of the poppet valve comparing to the spool valve, however, poorer linearity and control accuracy accompanies inevitably. Aiming at improving the control performance of poppet valves, the design of the water hydraulic digital valve is analyzed in this paper. A high speed digital valve is designed and controlled by PWM (Pulse-Width Modulation) and actuated by a piezoelectric ceramic stack with high frequency response and control stiffness. Another new design using poppet valves for digital bits is proposed to ensure enough seal ability and lower the cost of the valve, namely the multi-digit on-off valve. The simulation models of these two types of valves are built and the results show the different performances between the valves. The high speed digital valve is provided with high control accuracy and responsiveness. In contrast, large overshoot and oscillation are encountered during switching on the digits of the multi-digit on-off valve. Especially the switching process of the high digital bits requires to be regulated to reduce the large overshoot. The above analysis contributes to the improvement of lubrication and sealing in water hydraulic control valves and applications of water hydraulics in the industry.

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12

Holzhausen, Gary R., and William St. Lawrence. "Hydraulic fracture analysis method." Journal of the Acoustical Society of America 86, no. 2 (August 1989): 856. http://dx.doi.org/10.1121/1.398185.

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13

Yin, Ye, Dangwei Wang, Hantao Wang, Anjun Deng, and Shenghang Feng. "Error analysis of hydraulic radius evaluation in hydraulic calculation." E3S Web of Conferences 260 (2021): 03016. http://dx.doi.org/10.1051/e3sconf/202126003016.

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Hydraulic radius is an important parameter in hydraulic calculation. It is often deemed that hydraulic radius can be replaced by the cross-sectional average water depth when the width to depth ratio (B/H) is greater than a certain value in traditional. Based on the various artificial cross-section and natural ones, value-taking errors of hydraulic radius are studied in this paper. The results show that it is feasible to adopt the average water depth as the hydraulic radius when B/H of rectangular section is larger than 40 or B/H of isosceles triangular section is larger than 12. But for natural river, B/H is different when water level changes and there is no single-valued corresponding relationship between relative error and B/H. Therefore, we advise that hydraulic radius could not be replaced by other variables in hydraulic calculation of natural rivers.

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14

Shan, Fan, and Zeping Chen. "Hydraulic Simulation Analysis of Sonic Drilling Hydraulic Vibration Head." MATEC Web of Conferences 256 (2019): 02014. http://dx.doi.org/10.1051/matecconf/201925602014.

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The hydraulic vibration head is the core component of sonic drilling rig, and the performance of its hydraulic system influences the technology of sonic drilling directly. The structure and hydraulic system of the hydraulic vibration head are designed, and the AMESim model of the hydraulic system is established in the paper. The hydraulic vibration system is simulated and analyzed to find out the influence rule of vibration frequency on the system performance. The results show that the larger the vibration frequency f is, the smaller the amplitude H is, and the displacement response of the vibrating piston approximates the sine curve.The velocity and acceleration of the vibrating piston accordingly increased, and the exciting force F of the vibrating piston increased significantly.

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15

Mursinna, A., Erica McCormick, Katie Van Horn, Lisa Sartin, and Ashley Matheny. "Plant Hydraulic Trait Covariation: A Global Meta-Analysis to Reduce Degrees of Freedom in Trait-Based Hydrologic Models." Forests 9, no. 8 (July 25, 2018): 446. http://dx.doi.org/10.3390/f9080446.

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Current vegetation modeling strategies use broad categorizations of plants to estimate transpiration and biomass functions. A significant source of model error stems from vegetation categorizations that are mostly taxonomical with no basis in plant hydraulic strategy and response to changing environmental conditions. Here, we compile hydraulic traits from 355 species around the world to determine trait covariations in order to represent hydraulic strategies. Simple and stepwise regression analyses demonstrate the interconnectedness of multiple vegetative hydraulic traits, specifically, traits defining hydraulic conductivity and vulnerability to embolism with wood density and isohydricity. Drought sensitivity is strongly (Adjusted R2 = 0.52, p < 0.02) predicted by a stepwise linear model combining rooting depth, wood density, and isohydricity. Drought tolerance increased with increasing wood density and anisohydric response, but with decreasing rooting depth. The unexpected response to rooting depth may be due to other tradeoffs within the hydraulic system. Rooting depth was able to be predicted from sapwood specific conductivity and the water potential at 50% loss of conductivity. Interestingly, the influences of biome or growth form do not increase the accuracy of the drought tolerance model and were able to be omitted. Multiple regression analysis revealed 3D trait spaces and tradeoff axes along which species’ hydraulic strategies can be analyzed. These numerical trait spaces can reduce the necessary input to and parameterization of plant hydraulics modules, while increasing the physical representativeness of such simulations.

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16

Jegan, M. M., B. Pitchia Krishnan, Manoj Kumar Shanmugam, P. Infant Kebin Raj, and K. T. Bose. "Design and analysis of hydraulic fixture for hydraulic lift housing." Journal of Physics: Conference Series 1964, no. 7 (July 1, 2021): 072019. http://dx.doi.org/10.1088/1742-6596/1964/7/072019.

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17

Liu, Yifang. "Comparative Analysis of High Water Hydraulic Fluid for Hydraulic Support." International Journal of Oil, Gas and Coal Engineering 9, no. 1 (2021): 1. http://dx.doi.org/10.11648/j.ogce.20210901.11.

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18

Chimote, Ankita A. "Design and Analysis of Hydraulic Jack for Hydraulic Cylinder Assembly." International Journal for Research in Applied Science and Engineering Technology 7, no. 4 (April 30, 2019): 2027–30. http://dx.doi.org/10.22214/ijraset.2019.4368.

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19

Li, Xiao Gang, Wei Han Wang, Wei Fang Zhang, and Yu Fan Wang. "Reliability Analysis on the Chassis Hydraulic System in Hydraulic Loader." Applied Mechanics and Materials 299 (February 2013): 35–37. http://dx.doi.org/10.4028/www.scientific.net/amm.299.35.

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Hydraulic loader is a major equipment for the airport engineering, the high efficient excavation is closely related to the reliability of equipment. Due to severe environment in the construction site, the chassis hydraulic system has high failure rate in the loader. Based on the criticality matrix analysis, some fatal failure modes were traced, including the leakage of motor, the pollution of hydraulic oil, the suction air of pump. Through the reliability prediction analysis, the estimated reliability of the chassis hydraulic system is 0.27, and mean time between failures of the system is 183h, in addition, critical components in the system are also determined. The above result could be used as reference for the optimization designing.

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20

Chaney, DR, K. Demars, and PJ Fox. "Analysis of Hydraulic Gradient Effects for Laboratory Hydraulic Conductivity Testing." Geotechnical Testing Journal 19, no. 2 (1996): 181. http://dx.doi.org/10.1520/gtj10340j.

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21

Zakharov, Viacheslav, and Tatiana Minav. "Analysis of Field Oriented Control of Permanent Magnet Synchronous Motor for a Valveless Pump-Controlled Actuator." Proceedings 64, no. 1 (November 20, 2020): 19. http://dx.doi.org/10.3390/iecat2020-08491.

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Earlier research demonstrated that a pump-controlled hydraulic system combines the best properties of traditional hydraulics and electric intelligence. Thus, the new system has been proposed as a replacement for conventional valve-controlled systems, to improve the energy efficiency in non-road mobile machinery in particular. One of the pump-controlled systems can be realized via direct control of hydraulic pump/motor by varying speed of prime mover. Electric motor (EM) as a prime mover attract with higher efficiency (more than 90%) and a wide range of speed regulation. These advantages allow to improve the system efficiency and decrease the energy consumption in electric and hybrid non-road mobile machinery. Further EM's efficiency improvement can be achieved by using vector control systems, which provide rotor magnetic flux control proportionally to the shaft's speed. Considering all vector control’s benefits (high accuracy of speed control, smooth~start and smooth rotation of the motor in the entire frequency range, quick response to load changes, increased control range and accuracy of regulation), the electro-hydraulic systems and influence of electric part on hydraulic one is not investigated widely. Therefore, in this paper Field Oriented Control (FOC) is analyzed as One of the most perspective vector control systems for electro-hydraulic actuator application with a Permanent Magnet Synchronous Machine (PMSM) as a prime mover. In~this study, Direct-driven hydraulics (DDH) was considered as a study case. A detailed model of the PMSM control system with DDH was built in MATLAB/Simulink. The behavior of the DDH system was investigated by transient processes analysis of EM, pump, and cylinder in the normal and failure modes. The system demonstrates a difference between reference and simulated speed about 0.33% and 11.75% of average torque fluctuations. The behavior of the system in failure mode demonstrated multiple excesses of rated parameters.

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22

Guan, Enguang, Huihua Miao, Peibo Li, Jihao Liu, and Yanzheng Zhao. "Dynamic model analysis of hydraulic support." Advances in Mechanical Engineering 11, no. 1 (January 2019): 168781401882014. http://dx.doi.org/10.1177/1687814018820143.

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In view of the shortcomings of traditional hydraulic support system, such as poor mobility and limited range of adjustment, a new configuration with double parallelogram structure is proposed. Combining the kinematic diagram of the mechanism of the new support system and the relevant parameters of the balance moment, using the kinematic vector closed-loop modeling method and D’Alembert’s principle, the relationship equation between the generalized coordinates of the hydraulic support and the geometric position parameters is obtained, and the analysis model with plural-freedom is established. Dynamic response characteristics and natural frequencies of column hydraulic cylinder and balance hydraulic cylinder are analyzed. The results demonstrate that the natural frequencies of the improved balance hydraulic cylinder and column hydraulic cylinder have been greatly improved, and the safety performance of the hydraulic support has been greatly increased.

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23

Guo, Xiao Le, Zhi Ming Wang, and Zhi Hui Long. "Research Progresses of Hydraulics for Extended Reach Drilling in China, Part III: Hydraulics Design Method and Risk Analysis System." Advanced Materials Research 524-527 (May 2012): 1561–64. http://dx.doi.org/10.4028/www.scientific.net/amr.524-527.1561.

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The extended reach drilling (ERD) is being adopted widely in China. But it also brought a series of technical difficulties because of its own characteristics. Some progresses were made after several years of hard work in China about Hydraulics for ERD. In the paper of “Research Progresses and Perspectives of Hydraulics for Extended Reach Drilling in China, Part I” and “ Part II”, the author demenstrated part of these progresses including cuttings transport model, precise model of pressure loss calculation, hole cleaning monitoring method and hydraulic extended limit calculation model and analysis. In this paper, the rest were presented which inlcuding hydraulics design method and risk analysis system for ERD. Based on the above studies, the author finally developed a system of hole cleaning monitoring and hydraulics design and its risk analysis which could provide theoretical support and useful tool for engineering design and risk analysis before drilling. These researches are helpful to ERD and have enriched the hydraulic theory of ERD.

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24

Zublev, D. G., and V. D. Barsky. "Hydraulic Analysis of Coke Ovens." Coke and Chemistry 63, no. 4 (April 2020): 172–76. http://dx.doi.org/10.3103/s1068364x20040110.

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25

Biot, M. A., L. Masse, and W. L. Medlin. "Temperature Analysis in Hydraulic Fracturing." Journal of Petroleum Technology 39, no. 11 (November 1, 1987): 1389–97. http://dx.doi.org/10.2118/13228-pa.

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26

Hall, Jim W., Shawn A. Boyce, Yueling Wang, Richard J. Dawson, Stefano Tarantola, and Andrea Saltelli. "Sensitivity Analysis for Hydraulic Models." Journal of Hydraulic Engineering 135, no. 11 (November 2009): 959–69. http://dx.doi.org/10.1061/(asce)hy.1943-7900.0000098.

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27

Mikota, Gudrun. "Modal analysis of hydraulic pipelines." Journal of Sound and Vibration 332, no. 16 (August 2013): 3794–805. http://dx.doi.org/10.1016/j.jsv.2013.02.021.

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28

Golshani, Aliakbar, and Thanh Tran-Cong. "Energy analysis of hydraulic fracturing." KSCE Journal of Civil Engineering 13, no. 4 (June 24, 2009): 219–24. http://dx.doi.org/10.1007/s12205-009-0219-0.

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29

Salakhov, Ildar Ilgizarovich, Ildus Rifovich Mavleev, Vladimir Vladimirovich Voloshko, Ilnur Dinaesovich Galimyanov, and Rayaz Takhaviev Khalimovich. "Analysis Workflows Gear Hydraulic Machines." Biosciences, Biotechnology Research Asia 13, no. 2 (June 25, 2016): 779–84. http://dx.doi.org/10.13005/bbra/2097.

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30

Ide, T. "Analysis of hydraulic engine mount." JSAE Review 16, no. 3 (July 1995): 316. http://dx.doi.org/10.1016/0389-4304(95)95075-6.

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31

Xie, Miao, Jun Meng, Wen Xin Xu, Rong Bao Dong, and Jian Liang Wang. "Huge Forging Equipment Hydraulic System Dynamic Analysis." Advanced Materials Research 619 (December 2012): 459–62. http://dx.doi.org/10.4028/www.scientific.net/amr.619.459.

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In order to optimize the dynamic characteristic of hydraulic system of large forging equipment. It based on the model of one company of a certain aero-engine hydraulic system of hydraulic hammer forging, analysis the composition and working principle of hydraulic systems. Using simulation software AMESim, simulate the model of hydraulic systems and by changing the system pressure, flow and effect of the hammer-head stroke to explore this kind of switching characteristics of forging equipment’s hydraulic system. The result shows that this kind of simulation models can reflect the working status of hydraulic hammer well, and provide a technical reference for analysis and tuning equipment that with similar to forging equipment.

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32

Zhang, Li. "Analysis of Construction Machinery Hydraulic Control System." Applied Mechanics and Materials 401-403 (September 2013): 1590–95. http://dx.doi.org/10.4028/www.scientific.net/amm.401-403.1590.

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This article analyses the use requirement of construction machinery, introduce the main features of typical construction machinery hydraulic system, derived power control modes of hydraulic system form hydraulic power form, compares the advantages and disadvantages of each power control mode, gives the optimization solutions, at last, sum up the full text of the construction machinery hydraulic power and control modes and prospect of the hydraulic system to precision control.

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Sun, Wei, Cheng Yan Fan, and Zhi Peng Sun. "An Application and Analysis for Regulation of Hydraulic System." Advanced Materials Research 328-330 (September 2011): 2419–22. http://dx.doi.org/10.4028/www.scientific.net/amr.328-330.2419.

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In the actual application of the hydraulic system, a system often can’t be fully realized the design requirements, or some performance indicators are below the expectations of the system design. From some analyses, sometimes the reason is not a hydraulic system design, but the problem of regulation of the hydraulic system.It is frequently encountered problems in the hydraulic system of actual work that hydraulic system right regulation. Based on analysis of the hydraulic system by combined machine tool, hydraulic system of hydraulic elevator and special machine tool, explaining that the regulation of hydraulic system is essential to guarantee design requirements of system, reducing power loss, raise transmission efficiency and the further improvement for work properties. It should be paid sufficient attention to the regulation of system when the hydraulic system is running.

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34

Zhou, Yi Jun, and Jun Xu. "Design and Characteristic Analysis of Variable Speed Hydraulic System." Advanced Materials Research 591-593 (November 2012): 179–82. http://dx.doi.org/10.4028/www.scientific.net/amr.591-593.179.

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The motor variable frequency speed control technology applied to the traditional hydraulic system based on variable speed hydraulic transmission principle with The PLC technology, hydraulic control, detection technology and configuration of organic, it combine PLC as the core of the lower machine control components, PC as the control, researched the variable speed hydraulic test system hardware, software and control systems design. The experiments were performed, realized the variable speed hydraulic experimental platform for open loop control and variable speed hydraulic system parameters real-time monitoring and dynamic display. It overcomes some of the shortcomings of the conventional hydraulic system, improved the efficiency, the hydraulic system run more smoothly and reduce noise. The experiments show that the variable speed hydraulic test bench run well and achieve the purpose.

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35

Hotchkiss, Rollin H., Patrick J. Flanagan, and Kevin Donahoo. "Hydraulic Jumps in Broken-Back Culverts." Transportation Research Record: Journal of the Transportation Research Board 1851, no. 1 (January 2003): 35–44. http://dx.doi.org/10.3141/1851-04.

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A broken-back culvert has one or more changes in grade within the prismatic barrel profile. One section of a broken-back culvert is usually steep, with the steep slope contributing to high outlet velocities unless a hydraulic jump forms upstream from the culvert outlet. Predictive equations have been published for a wide range of experimental conditions but still do not describe the hydraulics of a jump as it traverses the steeply sloped section and the most downstream section of a broken-back culvert. A computer program, the Broken-Back Culvert Analysis Program (BCAP), analyzes the hydraulics of circular or box-shaped broken-back culverts and provides a comprehensive design tool for engineers. It predicts whether a hydraulic jump will occur and, if so, where it begins and ends. Analyses are performed for 10 discharges. Outputs include rating curves for headwater and outlet depths and outlet velocity and tabulations of hydraulic parameters for each discharge. The water surface profiles throughout the culvert, except through the hydraulic jump, are computed and are plotted on the screen. Experiments were performed with model culverts to assess the accuracy of the predictive equations in BCAP for headwater depth, the location of a hydraulic jump, and the hydraulic jump length. The predictions for the headwater depth at the culvert inlet matched the experimental observations well, but predictions for hydraulic jump location and length were less satisfactory. BCAP has been used for hundreds of design projects in Nebraska and has been downloaded almost 300 times from at least 22 different states. It is recommended that BCAP be improved as better experimental data become available.

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36

Yan, Bing Bing, Wen Bo Ren, Bao Lin Yin, and Yang Li. "Hydraulic System Simulation of 3-UPS Parallel Mechanism Based on ADAMS/Hydraulics." Key Engineering Materials 579-580 (September 2013): 430–33. http://dx.doi.org/10.4028/www.scientific.net/kem.579-580.430.

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In order to guaranty the work stability of the move-in-mud robot and movement relationship of wriggle turning joint, to use the 3-UPS parallel mechanism as the steering joint. Make full use of the characteristics flexibility, heavy force loading and small workspace of the parallel mechanism. Supporting link of the parallel mechanism driven by hydraulic cylinders, so a completely hydraulic system is an important factor to ensure the stationary work of parallel mechanism, provide the required power to go forward and ensure the forward speed of the move-in-mud robot. Establish the virtual prototype model of mechanical-hydraulic coupling system by using of Pro/E and ADAMS/Hydraulics software, do the dynamic simulation analysis of hydraulic control system based on Hydraulics module, the simulation process can be made more visual and vivid by three-dimensional visualization. Obtain the platform speed and hydraulic cylinder pressure curve after simulation, compare simulation results with theoretical calculations, and verify that the design is reasonable. The results show that it lays the foundation for the further optimization and research of the move-in-mud robot.

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Zeng, Qingliang, Yangyang Li, and Yang Yang. "Dynamic Analysis of Hydraulic Support with Single Clearance." Strojniški vestnik – Journal of Mechanical Engineering 67, no. 1-2 (February 24, 2021): 53–66. http://dx.doi.org/10.5545/sv-jme.2020.6998.

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Hydraulic support is a complex parallel mechanism composed of multiple kinematic pairs. In the work of hydraulic support, clearances between kinematic pairs are inevitable, which lead to the deterioration of the support’s working performance, and may even affect support’s normal work in serious cases. To study the influence of clearances on hydraulic support and simultaneously avoid the mutual interference between different clearances, the normal and tangential force models of kinematic pairs with clearance are established, based on the Lankarani-Nikravesh contact force model and the Coulomb friction model. Furthermore, the dynamic model of the hydraulic support with single clearance is established by adding a clearance between the rear link and base and, according to the dynamic model of the hydraulic support, the research about the influence of clearance on the movement and force of hydraulic support is carried out, which proves the need to study the clearance of hydraulic support. Moreover, the influence of clearance, clearance size, and different oil inlet drive modes of front and rear columns on the stability of hydraulic support are analysed, and then the change of hydraulic support posture caused by clearance and clearance size is considered. The results show that clearance causes the movement and force of the rear link to fluctuate, which affects the stability of the hydraulic support. The clearance size affects the fluctuation degree of the movement and force, which is an important factor in the instability of hydraulic support. Also, the hydraulic support posture is changed by the clearance and clearance size. Different column oil inlet drive modes have different impacts on the clearance and have different effects on the stability of hydraulic support.

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Manzana, Madalina Elena, Brandusa Ghiban, Ilare Bordeaşu, Nicolae Ghiban, Mihai Marin, and Florin Miculescu. "Structural Analysis of Steels by Cavitation Erosion." Key Engineering Materials 583 (September 2013): 28–31. http://dx.doi.org/10.4028/www.scientific.net/kem.583.28.

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Cavitation is an important factor in many areas of science and engineering, including acoustics, chemistry and hydraulics. In this paper the authors analyze the structural analysis of cavitation damages in two steel. The cavitation erosion tests were carried out in a magnetostrictive facility, in Timisoara Hydraulic Machinery Laboratory, in according with ASTM G32-85, using as cavitant liquid drink water at 20 10C. After quantitative and qualitative investigations structural features were put in evidence on experimental steel

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Chen, Jin Song, and Wen Bo Cheng. "Linear Analysis of Hydraulic Control System of an Electric-Hydraulic Proportion." Advanced Materials Research 898 (February 2014): 582–85. http://dx.doi.org/10.4028/www.scientific.net/amr.898.582.

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1780 mm hot rolling transport chain electro-hydraulic proportional hydraulic control system of Shanghai Meishan Iron and Steel Co., LTD. Of Baosteel is taken as an example in this paper. The features, the controlling method, the electro-hydraulic proportional directional valve selection and the decision of the specific circuits of this kind of metallurgical equipment are introduced in this paper.

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Chen, Wei Yang, and Lian Min Cao. "The Analysis of Electro-Hydraulic Valve Performance Based on AMESim Software." Advanced Materials Research 1049-1050 (October 2014): 901–7. http://dx.doi.org/10.4028/www.scientific.net/amr.1049-1050.901.

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The paper simulate electro-hydraulic valve hydraulic system through the study on hydraulic simulation research, research the response of accuracy and stability, using AMESim software build electro-hydraulic valve model, simulate the actual working conditions of the electro-hydraulic valve and column hydraulic system simulation, verify the correctness of dynamic simulation results. Reference simulation results,we present programs to improve electro-hydraulic valve to improve its stability. AMESim software has good dynamic simulation performance and simulation accuracy, which provides a new research idea for overall dynamic performances accurate analysis of the filling hydraulic support system.

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41

Omayu, Yukiyoshi, Nobuatsu Tanaka, and Michitsugu Mori. "ICONE15-10743 NUMERICAL ANALYSIS OF THERMAL-HYDRAULIC BEHAVIORS IN SI SYSTEM." Proceedings of the International Conference on Nuclear Engineering (ICONE) 2007.15 (2007): _ICONE1510. http://dx.doi.org/10.1299/jsmeicone.2007.15._icone1510_392.

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Bao, Jishi, Benke Qin, and Hanliang Bo. "ICONE19-43409 Analysis of Buffering Process of Control Rod Hydraulic Absorber." Proceedings of the International Conference on Nuclear Engineering (ICONE) 2011.19 (2011): _ICONE1943. http://dx.doi.org/10.1299/jsmeicone.2011.19._icone1943_169.

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TERADA, Atsuhiko, Hiroaki TAKEGAMI, Hiroki NOGUCHI, Yu KAMIJI, and Shuichi ISHIKURA. "ICONE19-43220 DEVELOPMENT OF HYDRAULIC ANALYSIS CODE FOR OPTIMIZING CERAMICS REACTORS." Proceedings of the International Conference on Nuclear Engineering (ICONE) 2011.19 (2011): _ICONE1943. http://dx.doi.org/10.1299/jsmeicone.2011.19._icone1943_88.

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44

David, Teresa S., Jorge S. David, Clara A. Pinto, Jan Cermak, Valery Nadezhdin, and Nadezhda Nadezhdina. "Hydraulic connectivity from roots to branches depicted through sap flow: analysis on a Quercus suber tree." Functional Plant Biology 39, no. 2 (2012): 103. http://dx.doi.org/10.1071/fp11185.

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The topology of the xylem network is likely to affect the transport of water, propagation of embolism and plant survival and growth. Few studies have been conducted on the hydraulics of the entire water pathway in trees. We evaluated the hydraulic connections from roots to branches in a mature Quercus suber L. tree, through sap flow responses upon branch severing. Sap flow was recorded in branches, stem and roots by the heat field deformation (HFD) method. Results showed that roots, except for the taproot, were hydraulically connected to all branches, but the rest of the tree (stem, branches and taproot) was highly sectored. In the large roots that showed an integrated response to branch severing, the outer xylem was preferentially connected to the same side branch and the inner xylem to the opposite branch. The hydraulic sectoriality in branches, stem and taproot may be regarded as an adaptive trait to water stress. The integrated hydraulic structure of roots is advantageous under patchy soil conditions, but may allow the spread of root diseases. The HFD sap flow method proved extremely useful to calculate xylem flux connectivity between different organs of a large tree, providing a comprehensive picture of its hydraulic architecture.

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Zhang, Xi, Jing Li, and Yao Bao Yin. "Thermal Analysis and Simulation of Aircraft Hydraulic System." Advanced Materials Research 204-210 (February 2011): 1984–89. http://dx.doi.org/10.4028/www.scientific.net/amr.204-210.1984.

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Thermal analysis of aircraft hydraulic systems is an important subject for system’s design. Heat generation and dissipation of aircraft hydraulic systems had been discussed in this article. Heat exchange was calculated based on heat transfer theory. A formula of temperature variation was derived based on the assumption that oil flow in the hydraulic system was one-dimension unsteady flow. Take the hydraulic system of a certain commercial aircraft for example, a model was established to simulate the temperature change of aircraft hydraulic systems based on AMESim. The simulation results are in consistent with test data.

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Feng, Jing Chang, Xiang Dong Kong, Jin Zhang, Li Juan Wang, and Chun Qing Liu. "Analysis of Hydraulic Press Servo System Based on Robust Controller." Applied Mechanics and Materials 644-650 (September 2014): 421–28. http://dx.doi.org/10.4028/www.scientific.net/amm.644-650.421.

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This paper researches and analyzes the modeling of electro-hydraulic proportional servo system to improve the characteristics of forging hydraulic servo control system and meet their requirements of forging a variety of materials. Based on robust compensator design, PID control strategy is proposed with uncertain disturbance of hydraulic press hydraulic servo system and the response characteristics of the system is simulated and analyzed. The results show that hydraulic press servo system which uses robust compensator has better performance than the traditional PID control and the chattering is eliminated. The test results and simulation results are compared by building simulation test system of 60MN hydraulic press electro-hydraulic proportional control system.

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Yue, Daling, Xiukun Zuo, Zengguang Liu, Yinshui Liu, Liejiang Wei, Jisu Sun, and Hongfei Gao. "Simulation Analysis of a Novel Digital Pump with Direct Recycling of Hydraulic Energy." Axioms 12, no. 7 (July 17, 2023): 696. http://dx.doi.org/10.3390/axioms12070696.

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There is a permanent and strong need for energy recovery to improve the efficiency of the hydraulic system in the field of the construction machinery. In addition, the digital pump will become powerful and versatile by employing different configurations and intelligent control of the flow distribution valves. Considering this case, we have proposed a novel digital pump in which every plunger is equipped with two flow distribution valves. By controlling these two valves, external hydraulic energy can be directly reused without other components. Based on the structure and working principle of the digital pump, the mathematical model is established and three working modes are detailed. To verify the feasibility and correctness of control methods, a performance simulation testing platform including a digital pump, load module, hydraulic energy to be recovered, and controller module was developed in AMESim R15 software. The pressure, flow rate, and torque simulations of the digital pump in three working modes were carried out. The simulation results have shown that the digital pump not only can be used as an ordinary pump but also has the function of recovery and immediate reutilization of another hydraulic energy. Meanwhile, the corresponding variable displacement control strategy is effective and the positive torque required to drive the digital pump can be reduced, which verified the energy-saving of this scheme. The ideas and contents in this paper can offer significant references for energy conservation technology of various engineering machineries and the intensive study of digital hydraulics.

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Kim, Jinman, Heuisoo Han, and Yoonhwa Jin. "Analysis of Pore Water Pressure and Piping of Hydraulic Well." Water 13, no. 4 (February 15, 2021): 502. http://dx.doi.org/10.3390/w13040502.

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This paper shows the results of a field appliance study of the hydraulic well method to prevent embankment piping, which is proposed by the Japanese Matsuyama River National Highway Office. The large-scale embankment experiment and seepage analysis were conducted to examine the hydraulic well. The experimental procedure is focused on the pore water pressure. The water levels of the hydraulic well were compared with pore water pressure data, which were used to look over the seepage variations. Two different types of large-scale experiments were conducted according to the installation points of hydraulic wells. The seepage velocity results by the experiment were almost similar to those of the analyses. Further, the pore water pressure oriented from the water level variations in the hydraulic well showed similar patterns between the experiment and numerical analysis; however, deeper from the surface, the larger pore water pressure of the numerical analysis was calculated compared to the experimental values. In addition, the piping effect according to the water level and location of the hydraulic well was quantitatively examined for an embankment having a piping guide part. As a result of applying the hydraulic well to the point where piping occurred, the hydraulic well with a 1.0 m water level reduced the seepage velocity by up to 86%. This is because the difference in the water level between the riverside and the protected side is reduced, and it resulted in reducing the seepage pressure. As a result of the theoretical and numerical hydraulic gradient analysis according to the change in the water level of the hydraulic well, the hydraulic gradient decreased linearly according to the water level of the hydraulic well. From the results according to the location of the hydraulic well, installation of it at the point where piping occurred was found to be the most effective. A hydraulic well is a good device for preventing the piping of an embankment if it is installed at the piping point and the proper water level of the hydraulic well is applied.

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Meng, Qing Rui, Shang Fei Lin, and Jian Wang. "Design and Analysis of Hydro-Viscous Winch Hydraulic System." Advanced Materials Research 605-607 (December 2012): 1317–21. http://dx.doi.org/10.4028/www.scientific.net/amr.605-607.1317.

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A hydro-viscous winch comprises a disc brake and a hydro-viscous brake. The hydraulic system is of utmost importance to the performance of the winch. To verify the validity of the hydraulic system, by using AMESim software, the simulation model of the hydraulic system was built and the performance analyzed. The results show that 1) the pressure and the flow rate of the disc brake hydraulic system are mainly affected by the energy accumulator; 2) Hydro-viscous brake hydraulic system pressure and lubricating oil flow rate are influenced by orifice diameter of the throttle valve; 3) during the braking period, the amplitude of the deceleration is rather small and the hydro-viscous winch hydraulic system can meet the requirements well. Research achievements of this work provides theoretical basis for optimal design of the hydro-viscous winch hydraulic system.

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Ding, Wen Si, Jian Yuan Liao, and Lin Yan Yuan. "Design and Simulation Analysis of the Multi-Stage Linear Synchronous Expanding and Contracting Hydraulic Cylinder." Applied Mechanics and Materials 779 (July 2015): 35–41. http://dx.doi.org/10.4028/www.scientific.net/amm.779.35.

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A double-action three-stage synchronous expanding and contracting hydraulic cylinder has been designed based on the principle of synchronous expanding and contracting hydraulics cylinder. The Principle of linear synchronous expanding and contracting hydraulics cylinder and the main points of design have been discussed. Modeling and simulation are conducted in AMESim system and the result shows that the multi-stage cylinder can expand and contract synchronously and smoothly. As long as the effective area is proportional, the multi-stage cylinder can move linearly.

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