Influence of pre-stage cavitation on performance of double-nozzle flapper pressure servo valves

Zhang, Jian; Qi, Naiming; Qian, Zhansong; Jiang, Jihai

doi:10.1177/0954406221994879

Cited by 4 publications

(2 citation statements)

References 25 publications

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“…As a key component of the electro-hydraulic servo system, the DJSV is often exposed to operating conditions with a wide temperature range. [1][2][3] For instance, the oil temperature in ground hydraulic systems typically ranges from 40°C to 80°C, while in Airbus A320, it spans from 254°C to 121°C. 4 In military aircraft, the servo valve must function properly even at 255°C.…”

Section: Introductionmentioning

confidence: 99%

The modeling and analysis of operating characteristics and temperature drift of deflector jet servo valve under the wide temperature range

Xiaoxue,

Yaobao,

Shuwei

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part C:

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The Deflector Jet Servo Valve (DJSV) holds a crucial role within the electro-hydraulic servo system, as its performance directly influences the equipment reliability. DJSV operates within a wide temperature range, and the temperature fluctuations result in the magnetomotive force variations of the permanent magnets and changes in the working air gaps, which influence the operating characteristics of the torque motor and contribute to temperature drift. Consequently, a theoretical model is proposed to comprehensively analyze the impact of these factors on the operating characteristics and temperature drift of the DJSV. The results indicate that as the temperature increases, the magnetic flux of working air gap decreases, while the temperature drift increases. Additionally, among the five initial air gap errors discussed, a centrosymmetric error of less than 0.02 l can significantly reduce the temperature drift. The proposed modeling and analysis method of temperature drift can be used to guide the design and analysis of DJSV in wide temperature range.

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Section: Introductionmentioning

confidence: 99%

The modeling and analysis of operating characteristics and temperature drift of deflector jet servo valve under the wide temperature range

Xiaoxue,

Yaobao,

Shuwei

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

show abstract

“…[1][2][3] The reason is that the electro-hydraulic servo control technology has the advantages of high dynamic response and high control precision. 4 However, as a key component in the e electro-hydraulic servo technology, the servo valve requires high oil quality and machining accuracy. 5,6 The above reasons make electrohydraulic servo technology unable to meet the needs of the civilian field.…”

Section: Introductionmentioning

confidence: 99%

Multi-objective optimization design of two-dimensional proportional valve with magnetic coupling

Meng

Zhu

et al. 2022

Advances in Mechanical Engineering

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As a hydro-mechanical servo system, the whole performance of the two-dimensional proportional valve with magnetic coupling (2D-MC-PV) highly depend on certain structural parameters. To tradeoff good static/dynamic characteristics, good working stability and low leakage pilot stage, a multi-objective optimization is inevitable for preliminary design stage. Therefore, this paper proposes a multi-objective optimization method based on AMESim and Matlab/Simulink co-simulation model, which optimizes key structural parameters by adjusting weight coefficients (balancing static, dynamic, and pilot leakage performance). Considering that magnetic coupling (MC) is the key component for 2D-MC-PV to realize spool position feedback and translational motion conversion, the analytical equation of MC is derived based on the Coulomb’s law and the law of equivalent magnetic charge, and the Monte Carlo method is used to calculate. Finally, the prototype of 2D-MC-PV is designed and manufactured, and a special experimental platform is built to test the static/dynamic characteristics. The experimental results show that 2D-MC-PV has good working stability: under working pressure of 20 MPa, the maximum no-load flow rate is 108.8 L/min with the hysteresis of 3.36%, and the amplitude and phase frequency width is 27.8 and 36.6 Hz. It shows that the multi-objective optimization method proposed in this paper can be used as an optimization method for 2D-MC-PV.

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Comprehensive modeling of a deflector jet pressure servo valve and analysis of key influences on the front stage

Liang,

Yuan,

Jiang

et al. 2024

Review of Scientific Instruments

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The deflector jet pressure servo valve (DJPSV), a critical component of the aircraft brake servo system, requires a precise foundational model for performance analysis, optimization, and enhancement. However, the complexity of the jet process within the V-groove of the deflector plate presents challenges for accurate mathematical modeling. To address this issue, the paper takes the DJPSV as the research object, carries out detailed mathematical modeling of its components, analyzes the influencing factors of the performance of the key component—the front stage—and optimizes the design of the key factors. First, integrating FLUENT velocity field analysis, this study proposes a novel perspective to rationally simplify and parametrically model the injection process in 3D space. Subsequently, a systematic deduction of the mathematical model for DJPSV is undertaken. Employing the AMESim platform and the secondary development module AMESet, a comprehensive simulation model is constructed, facilitating the study of static-dynamic valve characteristics. Additionally, utilizing the Morris theory and an intelligent algorithm, sensitivity analysis, and structural optimization on the critical component, the pre-stage. The results reveal that the width of the receiving diverter wedge (M), the width of the V-groove outlet (b1), and the distance from the V-groove outlet to the receiving diverter wedge (h) exert the most significant influence on the differential pressure of the pre-stage, which are the key parameters affecting the output differential pressure of the pre-stage. The experiment verifies the accuracy of the simulation model, offering a vital theoretical foundation for valve development and related areas.

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Influence of pre-stage cavitation on performance of double-nozzle flapper pressure servo valves

Cited by 4 publications

References 25 publications

The modeling and analysis of operating characteristics and temperature drift of deflector jet servo valve under the wide temperature range

The modeling and analysis of operating characteristics and temperature drift of deflector jet servo valve under the wide temperature range

Multi-objective optimization design of two-dimensional proportional valve with magnetic coupling

Comprehensive modeling of a deflector jet pressure servo valve and analysis of key influences on the front stage

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