Log in

Relevant bibliographies by topics / Nozzle-flapper / Journal articles

To see the other types of publications on this topic, follow the link: Nozzle-flapper.

Journal articles on the topic 'Nozzle-flapper'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Nozzle-flapper.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

2

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

3

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

4

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

5

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

6

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

7

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

8

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

9

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

11

Arafa, H. A., S. A. Kassem, and T. A. Osman. "Performance of four-nozzle flapper hydraulic servovalves." Mechanism and Machine Theory 22, no. 3 (January 1987): 243–51. http://dx.doi.org/10.1016/0094-114x(87)90008-5.

Full text

APA, Harvard, Vancouver, ISO, and other styles

12

Wang, Xin Hua, Jia Qing Chang, Shu Wen Sun, and Gang Zheng. "Theoretical and Simulative Study on Hydraulic Bridge of Water Hydraulic Servo Valve." Advanced Materials Research 181-182 (January 2011): 305–9. http://dx.doi.org/10.4028/www.scientific.net/amr.181-182.305.

Full text

Abstract:

An analysis has been conducted on the hydraulic bridge of the water hydraulic servo valve with annular clearance between sleeve and spool land as its first hydraulic resistance. Through some formula deductions, the simplified hydraulic bridge is drawn and the relationship between flapper displacement and differential pressure of spool ends, which is demonstrated by the subsequent simulation works, is extracted. By the CFD(computational fluid dynamics) simulation, firstly, the pressure distributions of the flapper face and the fore end face of the nozzle are obtained. Results show that the flapper has an annular area where the existing pressure is negative. Secondly, the relationship between flapper displacement and flow force acting on flapper is also acquired, which is much beneficial to the steady-state and dynamic analysis of the water hydraulic servo valve.

APA, Harvard, Vancouver, ISO, and other styles

13

Kang, Jian, Zhaohui Yuan, and Muhammad Tariq Sadiq. "Numerical Simulation and Experimental Research on Flow Force and Pressure Stability in a Nozzle-Flapper Servo Valve." Processes 8, no. 11 (November 3, 2020): 1404. http://dx.doi.org/10.3390/pr8111404.

Full text

Abstract:

In the nozzle flapper servo valve, the transient flow force on the flapper is the fundamental reason that affects the pressure stability. The pressure pulsation in the pilot stage causes forced vibration of the flapper, and its deviation will directly influence the control pressure difference, which will make the pressure appear unstable. In order to grasp the principle and characteristics of transient flow force and its influence on pressure stability, a mathematical model of flapper displacement and control pressure is derived. For collecting the dynamic changes of the transient flow force and recording the motion behavior of the flapper, a three-dimensional model of the pilot-stage is established. Numerical simulations of turbulence phenomenon analysis are conducted with a variation of flapper displacement ranging from 5 μm to 20 μm. It can be concluded that the change trend of the flapper displacement is similar to the steady-state flow force and the transient flow force pulsation amplitude. Under the same structural parameters, the pulsating frequency of the flow force remains basically constant. The fluctuation of the flow force of the pilot stage will cause the pressure of the servo valve control cavity to vibrate to a certain extent, which is a factor that cannot be ignored that affects the output stability of the servo valve.

APA, Harvard, Vancouver, ISO, and other styles

14

Prsic, D., C. Fragassa, N. Nedic, and A. Pavlovic. "Describing function of the pneumatic flapper-nozzle valve." Mechanical Systems and Signal Processing 124 (June 2019): 696–714. http://dx.doi.org/10.1016/j.ymssp.2019.01.043.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Liaw, Chong-Jer, and F. T. Brown. "Nonlinear Dynamics of an Electrohydraulic Flapper Nozzle Valve." Journal of Dynamic Systems, Measurement, and Control 112, no. 2 (June 1, 1990): 298–304. http://dx.doi.org/10.1115/1.2896139.

Full text

Abstract:

A nonlinear model of an electrohydraulic flapper-nozzle valve is developed, using an energy-based approach. Nonlinearities are found in the resistances, compliances, and the inertances; the latter produce state-dependent coupling terms. The model is applied to a valve designed for pulse-width modulation (PWM). Most model parameters are derived from a priori design parameters, but some were found from a series of experiments which also served to confirm the model. The valve and its model responded satisfactorily to PWM signals up to 500 Hz.

APA, Harvard, Vancouver, ISO, and other styles

16

Bokov, Vladimir. "Nozzle-flapper sensor mechanistic and statistical concurrent modeling." Measurement 37, no. 1 (January 2005): 47–61. http://dx.doi.org/10.1016/j.measurement.2004.08.001.

Full text

APA, Harvard, Vancouver, ISO, and other styles

17

Burrows, C. R., C. Mu, and J. Darling. "A Dynamic Analysis of a Nozzle-Flapper Valve With Integral Squeeze Film Damper." Journal of Dynamic Systems, Measurement, and Control 113, no. 4 (December 1, 1991): 702–8. http://dx.doi.org/10.1115/1.2896478.

Full text

Abstract:

An analysis of the dynamic response of a nozzle-flapper valve with integral squeeze film damper (SFD) is presented. An expression for oil film forces, including the effect of fluid inertia, has been derived using a first-order perturbation method. The nonlinear effect of flow control orifices is included in the simulation model. The effects of the squeeze film damper geometric coefficients have been examined and the flapper response to a step current input is modeled. The analysis also focuses on the relationships between output control pressure, input current, and supply pressure.

APA, Harvard, Vancouver, ISO, and other styles

18

Krivts, Dr Igor L. "Optimization of Performance Characteristics of Electropneumatic (Two-Stage) Servo Valve." Journal of Dynamic Systems, Measurement, and Control 126, no. 2 (June 1, 2004): 416–20. http://dx.doi.org/10.1115/1.1771693.

Full text

Abstract:

Servo valve is the key element in electropneumatic servomechanism. In this study, an electropneumatic two-stage servo valves were investigated in order to improve their static and dynamic characteristics. These servo valves consist of a pilot stage and a power stage. The paper discusses three different pilot stages: the jet pipe pilot stage, the supply (side) flapper nozzle pilot stage and the exhaust (side) flapper nozzle pilot stage. The static and dynamic characteristics of the devices were investigated analytically and by computer simulation. For the three pilot stage types it was found that the optimal value of the static and dynamic characteristics could be obtained if the ratio between the effective areas of the supply channel and exhaust port of the pilot stage has a definite value (depending on the pilot stage type).

APA, Harvard, Vancouver, ISO, and other styles

19

Pan, Xu Dong, Wen Dong Zhu, and Guang Lin Wang. "Servo Valve Nozzle Fuzzy Clustering Analysis Pairing Algorithm." Key Engineering Materials 667 (October 2015): 476–80. http://dx.doi.org/10.4028/www.scientific.net/kem.667.476.

Full text

Abstract:

Electro-hydraulic servo valve is the key component of an electro-hydraulic servo control system, and double nozzle flapper valve is the main type of electro-hydraulic servo valve. Nozzles are the important part of a double nozzle flapper valve, the pairing quality is directly related to the performance of the servo valve .Servo valve is of symmetrical structure, and the use of nozzles is also in pairs. The process of nozzles matched in pairs is called pairing process. Because the orifice diameter of the nozzle is only about 0.2 to 0.3 mm, it is difficult to pair with the method of direct measurements. Besides, as a kind of hydraulic components, nozzles are usually paired by flow rate measured under differential pressure. Two nozzles will be matched to a pair if their pressure-flow rate characteristic curve is within the allowed tolerance. To ensure the success rate of pairing, it usually needs a large number of machined nozzles to be sifted. According to the principle of clustering analysis, we propose a new paring algorithm which can match nozzles efficiently and automatically.

APA, Harvard, Vancouver, ISO, and other styles

20

Yang, Shu Zhen, Rui Qian, and Yu Jie Bai. "Study on the Control System of Grinding the Nozzle of Twin Flapper-Nozzle Valve." Applied Mechanics and Materials 644-650 (September 2014): 62–66. http://dx.doi.org/10.4028/www.scientific.net/amm.644-650.62.

Full text

Abstract:

In this paper, neural network and grey fuzzy control technology are applied in Abrasive Flow Machining (AFM) to grind the mico-hole in th nozzle of the twin flapper-nozzle valve. An intelligent control system with fine tuning working pressure is established that can predict the process parameters automatically before machining and forcast the flow to adjust the working pressure in machining.The result of experiment indicates that this system has high level of intelligent and can get very high machining accuracy.

APA, Harvard, Vancouver, ISO, and other styles

21

Wang, Xiao Hong, Qiu Xi Li, and Ya Li Feng. "Research of Double Nozzle Flapper Valve Accelerated Degradation Test." Applied Mechanics and Materials 532 (February 2014): 18–21. http://dx.doi.org/10.4028/www.scientific.net/amm.532.18.

Full text

Abstract:

This paper selected the double nozzle flapper type electro-hydraulic servo valve as the research object. Through to analys the wear failure mechanism of electro-hydraulic servo valve to determine the test stress and to select the Pressure gain and leakage as the Degradation performance indicators. So it makes the detail Accelerated degradation test project . and it designs a test system for the pollution wear test. Then, by modeling the degradation process as a drift Brown Motion of which the first passage time follow inverse Gaussian distribution, this paper generated the reliability model of the electro-hydraulic servo valve. Finally, the maximum likelihood combined with least square of accelerated degradation testing data is used to estimate the degradation data of leakage from the test.

APA, Harvard, Vancouver, ISO, and other styles

22

ZHANG, Yalin, Toshiharu KAGAWA, Toru YAMAMOTO, and Takeshi NAKATA. "Influences of Flow Jet Force on Nozzle Flapper Systems." TRANSACTIONS OF THE JAPAN FLUID POWER SYSTEM SOCIETY 34, no. 3 (2003): 55–61. http://dx.doi.org/10.5739/jfps.34.55.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

STEFANSKI, Frederik. "Pneumatic single flapper nozzle valve driven by piezoelectric tube." PRZEGL�D ELEKTROTECHNICZNY 1, no. 1 (January 5, 2015): 15–21. http://dx.doi.org/10.15199/48.2015.01.03.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

Yun, J. S., and H. S. Cho. "Steady State Characteristics of a Flapper-Nozzle Relief Valve." Proceedings of the Institution of Mechanical Engineers, Part A: Power and Process Engineering 201, no. 2 (May 1987): 135–44. http://dx.doi.org/10.1243/pime_proc_1987_201_015_02.

Full text

Abstract:

The static and dynamic characteristics of flapper-nozzle type electromagnetic relief valves have not so far been investigated analytically in depth, although they have been widely used for hydraulic load pressure control. In this paper a non-linear model of the relief valve is formulated explicitly, based upon rigid-body motion and fluid dynamics. Model parameters such as discharge coefficients, effective area of the nozzle and the electromagnetic constant were identified from the steady state characteristics and physical dimensions of the valve. Based upon this constructed model the static characteristics such as the pressure override and the relationship between input current and main pressure were obtained analytically and compared with those obtained experimentally. The comparison shows that this constructed analytical model can precisely predict such characteristics.

APA, Harvard, Vancouver, ISO, and other styles

25

Zhang, Shengzhuo, Nay Zar Aung, and Songjing Li. "Reduction of undesired lateral forces acting on the flapper of a flapper–nozzle pilot valve by using an innovative flapper shape." Energy Conversion and Management 106 (December 2015): 835–48. http://dx.doi.org/10.1016/j.enconman.2015.10.012.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

ARAKI, Kenji, Naike CHEN, and Yuji ISHINO. "Characteristics of a Force-balance Nozzle-flapper Type Pneumatic Pressure Control Proportional Valve. Part 1. Output Pressure versus Nozzle-Flapper Clearance Characteristics." Hydraulics & Pneumatics 26, no. 2 (1995): 184–90. http://dx.doi.org/10.5739/jfps1970.26.184.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Yang, Qingjun, Nay Zar Aung, and Songjing Li. "Confirmation on the effectiveness of rectangle-shaped flapper in reducing cavitation in flapper–nozzle pilot valve." Energy Conversion and Management 98 (July 2015): 184–98. http://dx.doi.org/10.1016/j.enconman.2015.03.096.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

Zhang, Wei, and Song Jing Li. "Dynamic Analysis of Flapper/Nozzle Electrohydraulic Servovalve Considering the Influence of the First-Stage Parameters." Applied Mechanics and Materials 687-691 (November 2014): 316–21. http://dx.doi.org/10.4028/www.scientific.net/amm.687-691.316.

Full text

Abstract:

The mathematic model of flapper/nozzle electrohydraulic servovalves is rearranged, many factors are reconsidered which have been omitted in the past analysis which are for the purposes of convenience or on the assumption that they are of no particular significance. According to the rearranged mathematic model, the simulation model of the servovalve is established using the Matlab/simulink software, dynamic response characteristics of the servovalve is simulated when the parameters of the discharge coefficient of nozzles and the viscous damping constant of torque motor and flapper are changed. Simulation results show that the change of the parameters influence the dynamic response of the spool displacement.

APA, Harvard, Vancouver, ISO, and other styles

29

Maksoud, T. M. A., A. A. Mokbel, and J. E. Morgan. "In-process detection of grinding wheel truing and dressing conditions using a flapper nozzle arrangement." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 211, no. 5 (May 1, 1997): 335–43. http://dx.doi.org/10.1243/0954405971516310.

Full text

Abstract:

The spatial distribution of sharp cutting edges around the active periphery of a grinding wheel has an important effect on the surface finish of ground components. In addition, random protrusion of sharp edges can result in a random distribution of grinding forces acting on the ground surface. A uniformly dressed and accurately trued wheel is essential for successful grinding. Since these conditions will alter during use, monitoring of them during grinding must be a requirement for critical grinding operations. This paper describes a new system for achieving on-line detection of the grinding wheel condition. The system uses a small air flapper nozzle-transducer arrangement which detects in-process changes of the grinding wheel surface topography, where external triggering of the data-acquisition system ensures a highly accurate identification of the wheel's surface topography irrespective of wheel speed. The benefits of this system are illustrated by experimental results that correlate the measurement of wheel topography by two means: flapper nozzle and stylus.

APA, Harvard, Vancouver, ISO, and other styles

30

Wang, Chuanli. "CONTROL PRESSURE CHARACTERISTICS OF NOZZLE FLAPPER VALVE BASED ON GMA." Chinese Journal of Mechanical Engineering 41, no. 05 (2005): 127. http://dx.doi.org/10.3901/jme.2005.05.127.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

WANG, Chuanli. "DYNAMIC CHARACTERISTICS OF NOZZLE FLAPPER SERVO VALVE BASED ON GMA." Chinese Journal of Mechanical Engineering 42, no. 10 (2006): 23. http://dx.doi.org/10.3901/jme.2006.10.023.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

MU, Dongjie. "Nonlinear Simulation and Linearization of Twin Flapper-nozzle Servo Valve." Journal of Mechanical Engineering 48, no. 02 (2012): 193. http://dx.doi.org/10.3901/jme.2012.02.193.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Wang, Xiao Hong, Yu Jie Yan, and Qiu Xi Li. "Contaminant Lock Life Prediction of Double Flapper-Nozzle Servo Valve." Advanced Materials Research 933 (May 2014): 953–58. http://dx.doi.org/10.4028/www.scientific.net/amr.933.953.

Full text

Abstract:

The thesis first analyzes the failure mechanism of contaminant lock, then the contaminant sensitivity theory or the Omega theory, which is first put forward by the Oklahoma state university hydrodynamic research center, is introduced and being applied to the servo valve contaminant lock life analysis and the contaminant sensitivity test method of servo valve is presented. After that, the value of servo valve contaminant lock sensitivity as well as the contaminant lock life can be calculated. It turned out that this method can accurately evaluate servo valves resistance on pollution lock and contaminant lock life, which can offer guidance on servo valve selecting and reliability analysis.

APA, Harvard, Vancouver, ISO, and other styles

34

Hayashi, Kousuke, Takeshi Nakada, Toshiharu Kagawa, and Keizo Otani. "Study on characteristics of nozzle flapper system considering flow force." Proceedings of the JSME annual meeting 2000.1 (2000): 221–22. http://dx.doi.org/10.1299/jsmemecjo.2000.1.0_221.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Zhu, Yuchuan, and Shangshu Fei. "Design criterion involving comprehensive performance characteristics of nozzle–flapper valves." Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 230, no. 5 (February 21, 2016): 452–66. http://dx.doi.org/10.1177/0959651816628718.

Full text

APA, Harvard, Vancouver, ISO, and other styles

36

Akers, A., and S.-C. J. Lin. "Squeeze-Film Damping of the Motion of a Control Flapper-Nozzle." Proceedings of the Institution of Mechanical Engineers, Part C: Mechanical Engineering Science 204, no. 2 (March 1990): 109–15. http://dx.doi.org/10.1243/pime_proc_1990_204_084_02.

Full text

Abstract:

A squeeze film used in a flapper-nozzle affords stand-alone properties to the flapper motion, meaning that it behaves in a dynamically stable manner. The device constitutes the first stage of a new family of two-stage electrohydraulic control valves. Successful mathematical modelling of it has been reported by Lin and Akers (1,2). Because of the expense of maintaining close manufacturing tolerances within the damper, the investigation included the extent of deterioration of dynamic response when the dimensions of the damper are varied, when the tolerances on the squeeze-film annular area are relaxed and when the annular clearance is increased. As a result of the investigation, the dimensions and other variables, chosen by trial-and-error procedures, appeared to be optimum from the point of view of dynamic performance, convenience of installation and cost.

APA, Harvard, Vancouver, ISO, and other styles

37

OHUCHI, Hidetoshi, Koutarou ASANO, and Tasuku OSADA. "801 A study of flow force compensation in a nozzle-flapper valve : Reduction of hysteresis of PZT flapper." Proceedings of Yamanashi District Conference 2004 (2004): 227–28. http://dx.doi.org/10.1299/jsmeyamanashi.2004.227.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Xuan Hong Son, Pham, and Tran Thien Phuc. "Comparison of jet pipe servo valve with flapper nozzle servo valve." Science and Technology Development Journal 20, K1 (March 31, 2017): 78–83. http://dx.doi.org/10.32508/stdj.v20ik1.418.

Full text

Abstract:

Electro-hydraulic servo valves (EHSVs) serve as an interface between electrical devices and hydraulic systems. They are capable of converting low power electrical input into movement of a spool to control precisely high power, low speed hydraulic actuators. Nowadays, jet pipe electro-hydraulic servo valve and flapper nozzle electro-hydraulic servo valve are typical two-stage control flow servo valve and are the most popular in use. This paper recommends and compares characteristics, working principle and structure for two kinds of servo valve. Besides, the simulation was carried out in a commercially software of Ansys, hence some features of jet pipe servo valve such as outstanding advantages of working feature or reliability are analysed.

APA, Harvard, Vancouver, ISO, and other styles

39

URATA, Eizo, and Yohichi NAKAO. "Study of a Flapper-Nozzle System for a Water Hydraulic Servovalve." Transactions of the Japan Society of Mechanical Engineers Series B 63, no. 610 (1997): 2062–69. http://dx.doi.org/10.1299/kikaib.63.2062.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

OHUCHI, Hidetoshi, and Ryouhei KAMIYA. "A Study of Flow Force Compensation in a Nozzle-Flapper Valve." Proceedings of Yamanashi District Conference 2002 (2002): 237–38. http://dx.doi.org/10.1299/jsmeyamanashi.2002.237.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Wang, Chuanli, Qipeng Li, and Fan Ding. "Design, Analysis and Experiment of GMM-Based Nozzle-Flapper Servo Valve." Advanced Science Letters 4, no. 6 (July 1, 2011): 2426–30. http://dx.doi.org/10.1166/asl.2011.1566.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

URATA, Eizo, and Yohichi NAKAO. "Study of a Flapper-Nozzle System for a Water Hydraulic Servovalve." JSME International Journal Series B 41, no. 2 (1998): 270–77. http://dx.doi.org/10.1299/jsmeb.41.270.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

Yang, He, Wen Wang, Keqing Lu, and Zhanfeng Chen. "Cavitation reduction of a flapper-nozzle pilot valve using continuous microjets." International Journal of Heat and Mass Transfer 133 (April 2019): 1099–109. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2019.01.008.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

Yang, He, Yufan Xu, Zhanfeng Chen, Wen Wang, Nay Zar Aung, and Songjing Li. "Cavitation suppression in the nozzle-flapper valves of the aircraft hydraulic system using triangular nozzle exits." Aerospace Science and Technology 112 (May 2021): 106598. http://dx.doi.org/10.1016/j.ast.2021.106598.

Full text

APA, Harvard, Vancouver, ISO, and other styles

45

Wang, Xin Hua, Jian Zheng, Wei Li, and Shu Wen Sun. "Design and Analysis of Hydraulic Full-Bridge Network for Water Hydraulic Servo Valve." Advanced Materials Research 181-182 (January 2011): 377–82. http://dx.doi.org/10.4028/www.scientific.net/amr.181-182.377.

Full text

Abstract:

Annular gap throttle has been used in water hydraulic slide valve which makes the hydraulic full-bridge network of the water hydraulic servo valve different from that of traditional hydraulic servo valve with fixed orifice. Based on liquid resistance theory and hydraulic bridge theory, the load pressure characteristics, pressure sensitivity and static characteristic parameters have been analyzed by the research of hydraulic full-bridge network constituted by annular gap throttle and clearance throttle between flapper and nozzle. The results show that the load pressure characteristics of the hydraulic full-bridge in water hydraulic servo valve keep fine linear relationship with flapper displacement, but the pressure sensitivity decreases in the normal working range of servo valve. However, the pressure sensitivity can achieve a reasonable value by the improvement of hydraulic full-bridge.

APA, Harvard, Vancouver, ISO, and other styles

46

Razminia, Abolhassan, and Dumitru Baleanu. "Fractional Order Models of Industrial Pneumatic Controllers." Abstract and Applied Analysis 2014 (2014): 1–9. http://dx.doi.org/10.1155/2014/871614.

Full text

Abstract:

This paper addresses a new approach for modeling of versatile controllers in industrial automation and process control systems such as pneumatic controllers. Some fractional order dynamical models are developed for pressure and pneumatic systems with bellows-nozzle-flapper configuration. In the light of fractional calculus, a fractional order derivative-derivative (FrDD) controller and integral-derivative (FrID) are remodeled. Numerical simulations illustrate the application of the obtained theoretical results in simple examples.

APA, Harvard, Vancouver, ISO, and other styles

47

Watton, J. "The Effect of Drain Orifice Damping on the Performance Characteristics of a Servovalve Flapper/Nozzle Stage." Journal of Dynamic Systems, Measurement, and Control 109, no. 1 (March 1, 1987): 19–23. http://dx.doi.org/10.1115/1.3143812.

Full text

Abstract:

The effect of a return line orifice on the steady-state performance and dynamic characteristics of a servovalve flapper/nozzle stage is investigated. Generalized design characteristics are initially developed and a specific application is then pursued by including torque motor dynamics. The possible cause of high frequency whistle within such systems is then discussed. A sufficient condition for valve whistle is established and shown to be critically dependent upon the supply pressure.

APA, Harvard, Vancouver, ISO, and other styles

48

Zhang, Li, Jing Luo, Rui-Bo Yuan, and Min He. "The CFD Analysis of Twin Flapper -nozzle Valve in Pure Water Hydraulic." Procedia Engineering 31 (2012): 220–27. http://dx.doi.org/10.1016/j.proeng.2012.01.1015.

Full text

APA, Harvard, Vancouver, ISO, and other styles

49

Kawashima, Kenji, Chongho Youn, and Toshiharu Kagawa. "Development of a Nozzle-Flapper-Type Servo Valve Using a Slit Structure." Journal of Fluids Engineering 129, no. 5 (November 6, 2006): 573–78. http://dx.doi.org/10.1115/1.2717617.

Full text

Abstract:

Pneumatic servo valves play a significant role in power transmission and system control using a pressurized gas. When pressurized air passes through servo valves, noise and pressure fluctuations are often experienced at the downstream side, and such fluctuations limit the value’s efficiency. In this paper, a novel four-port nozzle-flapper-type servo valve using a slit structure instead of an orifice plate is proposed. The slit structure maintains a laminar flow condition, and this provides an opportunity for the minimization of the noise and pressure fluctuations. The slit structure is fabricated using etching technology. The flow characteristics of the slit are investigated theoretically and experimentally in order to evaluate the design specifications and characteristics of the valve. The experimental results indicated that the noise level decreased by approximately 15dB and could reduce the pressure fluctuation by 75%, compared with the previous valve. It is felt that the valve is more effective than many current valves.

APA, Harvard, Vancouver, ISO, and other styles

50

Tang, Jie, Dian Rong Gao, and Li Wen Wang. "Research on Influence of Parameters Variation on the Fixed Orifice Performance of the Servo-Valve." Applied Mechanics and Materials 157-158 (February 2012): 612–16. http://dx.doi.org/10.4028/www.scientific.net/amm.157-158.612.

Full text

Abstract:

In this paper, The finite element analysis software is applied to compute the flow field in the fixed orifice with different structural parameter combinations, the pressure distribution curve, the velocity distribution curve, flow rate characteristic, power loss are obtained. By analyzing simulation results, the influence of the orifice parameters on the performance of the orifice is clear. The research is important for the design and optimization of the fixed throttle orifice of the nozzle-flapper valve.

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!