Stability Analysis of a Direct‐Operated Seawater Hydraulic Relief Valve under Deep Sea

Wu, Siyu; Li, Chao; Deng, Yipan

doi:10.1155/2017/5676317

Cited by 13 publications

(7 citation statements)

References 23 publications

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“…26 The relief valve will be stable within the depth 0–4000 m according to the stability analysis results that it always keep enough positive phase and magnitude margin. 26 However, the overshoot would be 75.3% at the depth of 2500 m indicting bad time domain performance. Suzukia and Urataa, developed a pilot SWHRV in order to prevent cavitation and improve its stability and static characteristic.…”

Section: Introductionmentioning

confidence: 99%

“…Yinshui et al, analyzed the influence of sea depths on the fit clearance between damping spindle and sleeve resulting from material deformation, the results indicated that the optimal fit clearances after deformation under deep-sea condition should be maintained in 0.019–0.045 mm and the SWHRV has well working performance under the condition within the depth of 1700 m. 25 Wu et al, researched the stability of a direct acting SWHRV taking into account the deformation in deep-sea environment through time and frequency analysis. 26 The results indicated that the fit clearance between damping sleeve and spindle reaches to 0 mm at the depth of 4000 m making the valve spool stuck and invalid. 26 The relief valve will be stable within the depth 0–4000 m according to the stability analysis results that it always keep enough positive phase and magnitude margin.…”

Section: Introductionmentioning

confidence: 99%

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Research on the dynamic characteristic of a Seawater-Hydraulic-Relief-Valve with a damping orifice

Zhang

Bao

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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Seawater-Hydraulic-Relief-Valve (SWHRV) is a significant control component for Seawater-Hydraulic-System in underwater equipment. It makes the Seawater-Hydraulic-System operate within the relief pressure range and ensure the safety of the whole Seawater-Hydraulic-System. The performance of a SWHRV with an orifice and damping chamber is researched in this paper. The nonlinear mathematic model is built based on the operation principal and the visualization graphic simulation model is built by use of AMESim software. The simulation results indicates it has well static performances and satisfies the industrial requirements. Its rated opening pressure is 100 bar, and the releasing flowrate reaches 100 l/min when the pressure increase to 107 bar. The pressure adjusting range is between 100 bar and 205 bar. And the maximum releasing flowrate is as high as 1600 l/min at the pressure of 205 bar. Due to the damping orifice and chamber, a damping force would generate accompanying with the dynamitic motion of the spool. The opening dynamic characteristic is evidently improved though the shutting time becomes longer in comparison with the relief valve without orifice. The pressure oscillation is eliminated and it could reach the steady state ultimately. Furthermore, the effect of the damping orifice and chamber’s structure parameters on the dynamitic characteristic is analyzed. The orifice’s cross-sectional area is the main effect factor and the influence of the initial chamber volume can be neglected. Finally, the relief valve achieves well dynamic characteristic with the peak time 0.003 s and the transition time 0.015 s. The overshoot is about 20%. It has well performance with fast response, small overshoot and strong robustness.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on the dynamic characteristic of a Seawater-Hydraulic-Relief-Valve with a damping orifice

Zhang

Bao

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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show abstract

“…27 Wu et al obtained the transfer function of a seawater direct-acting relief valve, and analyzed its stability using the Routh criterion. 28 Zhang et al studied the stability of a valvistor cartridge valve and found that the stability of the main valve was related to the opening and area gain of the pilot valve and the volume of the control chamber. 29 People also used the Lyapunov direct method and absolute stability theory to solve stability problem.…”

Section: Introductionmentioning

confidence: 99%

Novel resonance stability criterion for the 2D magnetically levitated servo-proportional valve

Meng

Zhu

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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The leakage of the pilot stage of the 2D valve mainly depends on the size of its initial opening. According to the Routh criterion, the pilot stage of the two-dimensional magnetically levitated servo-proportional valve (2D-MSP valve) needs to be designed to have certain positive values to increase the damping ratio to improve valve stability, which leads to the leakage flow representing a non-negligible power loss. In order to reduce leakage flow and achieve goal of energy saving, this paper presents a novel resonance stability criterion by considering nonlinear characteristics of the fluid dynamic system. First, the 2D-MSP valve is regarded as a three-way valve-controlled differential cylinder system. Based on the frequency response of the resonance state, the energy conservation method is used to solve the flow “backfilling” area, the motion equation of the cylinder piston (valve spool displacement) and the pressure waveform of the sensing chamber under different opening and pressure amplitude ratio. Then, the analytical expression of the resonance peak amplitude is obtained and the resonance stability criterion is deduced. The result is compared with the Routh stability criterion, which illustrates that the positive openings of the pilot stage can be reduced to one-third of the original value. The prototype valve is then designed and manufactured based on the resonance stability criterion. The dynamic and static characteristics under different system pressures are measured. Experimental results show that the prototype valve is an over-damped system without any overshoot, which has excellent working stability, and its static and dynamic performance can meet the demands of the industry servo-proportional control system. The research work validates the effectiveness of the proposed resonance stability criterion.

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“…Direct-acting relief valve is widely applied for pressure adjustment in fuel pump [1][2][3][4][5]; when it is used underwater for torpedo, its stability is generally affected by the ocean environment. Specifically, as there is pressure fluctuation at the relief valve due to the influences of water depth, the valve element can lose its stability via Hopf bifurcation [6][7][8] and can further enter into chaos via grazing bifurcation due to the axial impact between the valve element and valve seat [6,[9][10][11][12][13][14]. Based on the previous investigations, the contact nonlinearity [15][16][17][18] is the match point for understanding the dynamic behaviors of this or similar systems.…”

Section: Introductionmentioning

confidence: 99%

Mathematical Modelling and Dynamic Analysis of a Direct‐Acting Relief Valve Based on Fluid‐Structure Coupling Analysis

Song¹,

Yang²,

Zhang³

2021

Shock and Vibration

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To explain the sudden jump of pressure as the variation of water depth for a direct-acting relief valve used by torpedo pump as the variation of water depth, a 2-DOF fluid-structure coupling dynamic model is developed. A nonlinear differential pressure model at valve port is applied to model the axial vibration of fluid, and a nonlinear wake oscillator model is used to excite the valve element in the vertical direction; meanwhile, the contact nonlinearity between the valve element and valve seat is also taken into consideration. Based on the developed dynamical model, the water depths for the sudden jumps of pressure can be located precisely when compared with the experimental signals, and the corresponding vibration conditions of the valve element in both the axial and vertical directions are explored. Subsequently, in order to eliminate the sudden jumps of pressure, different pump inlet pressure was tested experimentally; when it was decreased to 0.4 MPa, the pressure jumps ever appeared during the dropping and lifting processes were removed, and the numerical simulation based on the developed mathematical model also verified the experimental measurements.

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Stability Analysis of a Direct‐Operated Seawater Hydraulic Relief Valve under Deep Sea

Cited by 13 publications

References 23 publications

Research on the dynamic characteristic of a Seawater-Hydraulic-Relief-Valve with a damping orifice

Research on the dynamic characteristic of a Seawater-Hydraulic-Relief-Valve with a damping orifice

Novel resonance stability criterion for the 2D magnetically levitated servo-proportional valve

Mathematical Modelling and Dynamic Analysis of a Direct‐Acting Relief Valve Based on Fluid‐Structure Coupling Analysis

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