Relevant bibliographies by topics / Nozzle-flapper

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Nozzle-flapper'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Nozzle-flapper"

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Wang, Xiao Lu, Yu Chuan Zhu, Qing Feng Cheng, Yue Song Li, and Hong Xiang Xu. "Simulation Research on the Four-Nozzle Flapper Valve Based on GMA." Advanced Materials Research 287-290 (July 2011): 239–44. http://dx.doi.org/10.4028/www.scientific.net/amr.287-290.239.

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Nozzle-flapper type electro-hydraulic servo valve operated by torque motor has been widely used in industrial applications. As their bandwidths are limited, they are not suitable for high-speed applications. This paper presents a novel nozzle flapper valve driven by the giant magnetostrictive actuator, which has been designed and integrated into the four-nozzle flapper valve to replace the torque motor. And the influence of involved structural parameters on the dynamics of the actuator and the nozzle flapper valve is analyzed by AMESim. The simulation results can provide an important reference and basis for the optimization and design of the four-nozzle flapper valve.
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Lu, Liang, Shirang Long, and Kangwu Zhu. "A Numerical Research on Vortex Street Flow Oscillation in the Double Flapper Nozzle Servo Valve." Processes 7, no. 10 (October 11, 2019): 721. http://dx.doi.org/10.3390/pr7100721.

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The oscillating flow field of the double nozzle flapper servo valve pre-stage is numerically analyzed through Large Eddy Simulation (LES) turbulent modeling with the previous grid independence verification. The vortex street flow phenomenon can be observed when the flow passes through the nozzle flapper channel, the vortex alternating in each side produces the periodical flow oscillation. The structural and flow parameter effects on the oscillating flow are emphasized, and it could be determined that the pressure on the flapper is nearly proportional to the flow velocity and inversely proportional to the actual distance between the flapper and the nozzle. On the other hand, the main frequency of oscillation decreases with the velocity and increases with the distance between the nozzle flapper. The main stage movement is further considered with a User Defined Function (UDF), and it could be determined that the influences of the structural and flow parameters on the flow oscillation are rarely changed, but the main frequencies drop, generally.
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Lu, Xiang Hui, and Dian Rong Gao. "The Influence of the Damping Hole Parameters on the Performance of Double Nozzle Flapper Valve Basing on the Orthogonal Test." Applied Mechanics and Materials 233 (November 2012): 35–38. http://dx.doi.org/10.4028/www.scientific.net/amm.233.35.

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This paper analyses the flow of the double nozzle flapper valve. Three-dimensional model is established with software Pro/E, fluid analysis software is used for modeling and meshing, CFD method is applied for researching pressure, and flow characteristics of the fixed damping hole is researched when parameters of double nozzle flapper valve is varied. The results show that: the highest velocity through the fixed orifice hole is about 150m/s, the pressure is about 5.9MPa; Using orthogonal test to analyze the simulation results, it is obtained that the power losses of the double nozzle flapper with the change of the diameter, length and the angle of the fixed orifice, the influencing factors on the power losses are the diameter, length and the angle, and the best parameter combination through orthogonal table analysis is gained, which can provide the reference for the whole designing of the double nozzle flapper valve.
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Colin, S., A. Bonnet, and R. Caen. "A New High Supply Pressure Pneumatic Flapper-Nozzle With Linear Behavior." Journal of Dynamic Systems, Measurement, and Control 118, no. 2 (June 1, 1996): 259–66. http://dx.doi.org/10.1115/1.2802312.

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In order to optimize the devices which incorporate flapper-nozzle systems, the behavior of these systems must be completely modeled theoretically. However, the complexity of the flow between the nozzle and the flapper generally requires an empirical calibration of the discharge coefficients. In this article we will propose two types of flapper-nozzle designs which make completely theoretical determination of steady flow possible. This is required for device optimization. The second design makes it possible to obtain strictly linear behavior, which offers several advantages compared to classic devices. The results of experimental testing correspond closely to the theoretical predictions.
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Lin, S. J., and A. Akers. "A Dynamic Model of the Flapper-Nozzle Component of an Electrohydraulic Servovalve." Journal of Dynamic Systems, Measurement, and Control 111, no. 1 (March 1, 1989): 105–9. http://dx.doi.org/10.1115/1.3153006.

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An analysis has been conducted on the flapper-nozzle stage of a two-stage electrohydraulic controller that has been specifically designed to be a stable, stand-alone dynamic system. Calculations performed on equilibrium control pressures, stage gain, and frequency response characteristics agree with values obtained experimentally to within close limits. The analysis applies generally to a flapper-nozzle combination using any set of dimensions convenient for the designer. Flow-pressure equations and flapper dynamic properties have also been given to enable the designer to obtain full design characteristics.
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Chu, Yuanbo, Zhaohui Yuan, and Wenchao Chang. "Research on the Dynamic Erosion Wear Characteristics of a Nozzle Flapper Pressure Servo Valve Used in Aircraft Brake System." Mathematical Problems in Engineering 2020 (August 24, 2020): 1–13. http://dx.doi.org/10.1155/2020/3136412.

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The nozzle flapper pressure servo valve is a kind of high-precision hydraulic component that can be widely used in the aircraft brake system. In actual service, the dynamic erosion wear behavior will occur at the pilot stage because of the gradual contamination of oil and the variable distance between nozzle and flapper. For this purpose, the paper proposes a dynamic erosion wear characteristics analysis and service life prediction method in which firstly the structural feature and working principle of the nozzle flapper pressure valve are analyzed using the brake cavity as the load blind cavity. Secondly, the dynamics simulation model and the performance experiment system of the pressure valve are separately constructed, and then the validation of the constructed model is conducted by contrasting the results between simulation and experiment. Finally, the mathematical models of the degradation process induced by the dynamic erosion wear are established, and then the dynamic erosion wear characteristics under dynamic structural distance and contamination conditions are analyzed, which are combined with the failure threshold value determined by the dynamics simulation to finish the service life prediction of the nozzle flapper pressure servo valve.
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Bang, Y.-B., K.-I. Lee, C.-S. Joo, and J.-W. Hur. "Two-stage electrohydraulic servovalve using stack-type piezoelectric elements." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 218, no. 1 (January 1, 2004): 53–65. http://dx.doi.org/10.1243/095440604322786947.

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This paper presents a two-stage electrohydraulic servovalve with a nozzle-flapper pilot stage, which is controlled by stack-type piezoelectric elements. The flapper moving mechanism proposed in this research compensates for the thermal expansion of the piezoelectric elements and applies preload to the piezoelectric elements. The experimental result shows that this flapper moving mechanism has a frequency response of over 500 Hz without oil pressure, and a simplified servovalve system using this flapper moving mechanism has a frequency response of about 150 Hz at the supply pressure of 210 bar.
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Mchenya, Jacob M., Sheng Zhuo Zhang, and Song Jing Li. "Visualization of Flow-Field between the Flapper and Nozzle in a Hydraulic Servo-Valve." Advanced Materials Research 402 (November 2011): 407–11. http://dx.doi.org/10.4028/www.scientific.net/amr.402.407.

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In order to understand the mechanism and get rid of the high-frequency self-excited noise in a hydraulic servo-valve, in this paper, the flow field distribution in the pilot stage of a hydraulic flapper-nozzle servo-valve is investigated. An assembly is prepared representing the construction and working principle of the flow field inside the pilot stage of a hydraulic flapper-nozzle servo-valve. A method of visualization is developed by taking videos for the flow field inside the transparent assembly with a high speed video camera. In this study, at different inlet pressure the high speed video camera was utilized for flow visualization together with computer-assisted image measurement. The shape of the jet flow, the cavitations and vortex flow inside the flow field can be visualized clearly. The proposed method enables to analyze the flow-field in the pilot stage of a hydraulic flapper-nozzle servo-valve by giving useful information for better design.
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Kagawa, Toshiharu. "Heat Transfer Effects on the Frequency Response of a Pneumatic Nozzle Flapper." Journal of Dynamic Systems, Measurement, and Control 107, no. 4 (December 1, 1985): 332–36. http://dx.doi.org/10.1115/1.3140744.

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The dynamics of a pneumatic nozzle flapper are influenced by the heat transfer characteristics in the air chamber. In this paper the transfer function for a nozzle flapper is analytically derived considering the heat transfer. As a result it is shown that the system can be expressed as a second order time lag system. In the experiments, the frequency response tests have been conducted for different heat transfer conditions, and the heat transfer effect is clearly shown. The experimental data are in satisfactory agreement with the calculated frequency responses.
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10

Lin, S. J., and A. Akers. "Dynamic Analysis of a Flapper-Nozzle Valve." Journal of Dynamic Systems, Measurement, and Control 113, no. 1 (March 1, 1991): 163–67. http://dx.doi.org/10.1115/1.2896343.

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A previous analysis into the dynamic behavior of the flapper-nozzle component of the electrohydraulic servovalve was performed after linearization of the equations relating to control piston flow (Lin and Akers, 1989a). This paper reports results for first-stage gain and for dynamic behavior when linearization has not been performed. Good agreement has been achieved between results calculated from the nonlinear theory presented and experimental results.
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Dissertations / Theses on the topic "Nozzle-flapper"

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Plummer, Andrew. "Electrohydraulic servovalves – past, present, and future." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-200252.

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In 2016 it is 70 years since the first patent for a two-stage servovalve was filed, and 60 years since the double nozzle-flapper two-stage valve patent was granted. This paper reviews the many alternative servovalve designs that were investigated at that time, focusing on two-stage valves. The development of single-stage valves – otherwise known as direct drive or proportional valves – for industrial rather than aerospace application is also briefly reviewed. Ongoing research into alternative valve technology is then discussed, particularly focussing on piezoelectric actuation and the opportunities afforded by additive manufacturing.
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Book chapters on the topic "Nozzle-flapper"

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Vyas, J. Jaidev, Balamurugan Gopalsamy, and Harshavardhan Joshi. "Mathematical Modeling of Flapper Nozzle Valve." In Electro-Hydraulic Actuation Systems, 19–37. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-2547-2_2.

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Conference papers on the topic "Nozzle-flapper"

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Peng, Jinghui, Nay Zar Aung, and Songjing Li. "Structural optimization and characteristics analysis of innovative flapper shape in a flapper-nozzle pilot valve." In 2015 International Conference on Fluid Power and Mechatronics (FPM). IEEE, 2015. http://dx.doi.org/10.1109/fpm.2015.7337128.

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Lin, S. J., and A. Akers. "A Non-Linear Model of a Flapper-Nozzle Valve." In 1989 American Control Conference. IEEE, 1989. http://dx.doi.org/10.23919/acc.1989.4790427.

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Lv, Xinbei, Songjing Li, and Shengzhuo Zhang. "A numerical study of flow field in a flapper-nozzle pilot valve with a moving flapper." In 2016 IEEE/CSAA International Conference on Aircraft Utility Systems (AUS). IEEE, 2016. http://dx.doi.org/10.1109/aus.2016.7748127.

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Hongcheng, Yang, and Yao Xiaoxian. "Modeling and Simulation of Double Nozzle Flapper Gas Servo Valve." In 2017 International Conference on Computer Systems, Electronics and Control (ICCSEC). IEEE, 2017. http://dx.doi.org/10.1109/iccsec.2017.8446971.

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Chen, Yingchun, Xinhua Wang, Xuan Zhang, Yingchao Li, and Gang Zheng. "Simulation study on the parameters of hydraulic flapper-nozzle valve." In 2016 IEEE/CSAA International Conference on Aircraft Utility Systems (AUS). IEEE, 2016. http://dx.doi.org/10.1109/aus.2016.7748221.

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Tsai, S. T., A. Akers, and S. J. Lin. "Use of a Flapper-Nozzle Valve for Axial Piston Pump Control." In International Off-Highway & Powerplant Congress & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1991. http://dx.doi.org/10.4271/911817.

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Ren, Jinsheng, Xiaoyang Li, Tongmin Jiang, and Hong Wu. "Double-nozzle flapper-style hydraulic servovalve simulation based on sphere wear." In 2011 9th International Conference on Reliability, Maintainability and Safety (ICRMS 2011). IEEE, 2011. http://dx.doi.org/10.1109/icrms.2011.5979478.

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Du, Yihao, and Bin Wang. "An Electrohydraulic Actuation Scheme Using Novel Piezoelectrically-Actuated Nozzle Flapper Valve." In 2018 IEEE 18th International Power Electronics and Motion Control Conference (PEMC). IEEE, 2018. http://dx.doi.org/10.1109/epepemc.2018.8521958.

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Lin, S. J., and A. Akers. "The Predicted Performance of a Flapper-Nozzle Valve: Comparison with Experiment." In 1988 American Control Conference. IEEE, 1988. http://dx.doi.org/10.23919/acc.1988.4790043.

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Meng Chen, Lin Sun, Songjing Li, and Changfang Zou. "Experiment Study of Noise in a Flapper-Nozzle Valve under Pulsing Inlet Pressure of the Nozzle." In CSAA/IET International Conference on Aircraft Utility Systems (AUS 2018). Institution of Engineering and Technology, 2018. http://dx.doi.org/10.1049/cp.2018.0087.

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Journal articles
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