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| 1 | 偏导射流伺服阀工作压力形成机理研究显示文摘偏转板射流是产生伺服阀工作压力的关键阶段。将接收腔作为恒压封闭容腔,对作用于接收腔的射流进行动量分析,提出一种基于射流反射假设的接收腔理论模型,解释了接收腔工作压力的形成机理,并给出了压力和压差计算的表达式。实验表明,当偏导板小范围运动时,该模型能够较好地反映2个接收腔压差的变化规律;而当力矩马达偏转角度较大,实际压力增益会有所下降,引起一定的计算误差。该模型简化了接收腔工作压力的计算,为偏导射流阀前置级液压放大器的设计提供了理论依据。 | 毛麒源 延皓 左哲清 刘金鑫 | 2020 | 液压与气动2020，44，10： | 7 |
| 2 | Theoretical and experimental investigation on novel 2D maglev servo proportional valve显示文摘This paper presents a novel two-dimensional maglev servo proportional cartridge valve(2 D maglev valve),where a contactless maglev coupling is introduced between electro-mechanical converter and valve body to realize functions of force transmission,spool position feedback and linear-rotary motion conversion.Such configuration can effectively reduce cost of both valve manufacturing and electro-mechanical converter,while still maintain features of 2 D valve such as null pilot leakage,high power-to-weight ratio and excellent anti-pollution capacity.Firstly,the characteristic equation of the valve is derived using linear theory,and the stability criterion is established for parameter determination.The influences of crucial structural parameters such as initial height of overlapping area,width of high-pressure and low-pressure holes,acting radius of magnetic force,pitch angle of maglev coupling,length of sensitive chamber and system pressure on the dynamic response are investigated based on AMESim numerical simulation.The prototype valve is then designed and manufactured and a special test rig is built.The no-load flow characteristic,load flow characteristic,leakage characteristic,amplitude and phase frequency characteristics and step response under different system pressures are measured.The experimental results are in a good agreement with the simulated analysis.As an over-damped system,the prototype valve has excellent working stability,which can reach a no-load flow rate of 105.9 L/min with hysteresis of 3.51%,amplitude bandwidth of 28.7 Hz and phase bandwidth of 42.8 Hz under 21 MPa.The research indicates that the 2 D maglev valve can be a potential solution of flow rate control valve for flight control surface system of civil aircraft with high pressure and large flow rate application. | Bin MENG Hao XU Jian RUAN Sheng LI | 2021 | Chinese Journal of Aeronautics2021，34，4： | 5 |
| 3 | Dynamic Characteristics of the Jet Force on the Flapper of the Pilot Stage in a Flapper Nozzle Servo Valve Under the Flow-Solid Interaction显示文摘Nowadays,more and more attention has been paid to improve the performance of the nozzle flapper servo valve.As a core part of nozzle flapper servo valve,the armature assembly is affected by electromagnetic force,jet force and feedback force at the same time.Due to the complex structure of the pilot stage flow field and the high jet pressure,the prediction of the jet force has always been difficult in modeling the transient motion of the servo valve.Whereupon,a numerical simulation method based on the flow-solid interaction(FSI)is applied to observe the variation of the jet force when the flapper is moving.Different parameters are employed to seek a suitable numerical simulation model which can balance the accuracy and computational cost.By comparing with the experiment results,the effectiveness of numerical simulation method in predicting the variation of the jet force and cavitation is verified.By this numerical simulation model,the distribution of flow field and the force on the flapper predicted by the moving and fixed flapper are compared.The results show that more dynamic details are achieved by the transient simulation.By analyzing the numerical simulation results of different inlet pressures and flapper vibration frequencies,the relationship between the movement of the flapper,the flow field distribution,the jet force and the inlet pressure is established,which provides a theoretical basis for the subsequent modeling of the armature assembly. | Xinbei Lü Jinghui Peng Songjing Li | 2020 | Journal of Beijing Institute of Technology2020，29，4： | 0 |
| 4 | Three-dimensional flow field mathematical model inside the pilot stage of the deflector jet servo valve显示文摘A new flow field mathematical model is proposed to describe accurately the flow field structure and calculate the static characteristics of the pilot stage in a deflector jet servo valve(DJSV). The flow field is divided into five regions, a 3D turbulent jet is adopted to describe the free jet region, and a velocity distribution expression of the jet is proposed. The jet entrainment model is put forward in the pressure recovery region to describe the coupling relationship between the pressure in the receiving chamber and the jet flow. The static characteristics, including pressure-flow characteristics, pressure characteristics,and flow characteristics of the pilot stage are obtained. The flow field structure and the static characteristics are verified by finite element analysis(FEA) and experiment, respectively, and the mathematical model results are in good agreement with the experimental and simulation results. | Shuang-lu LI Yao-bao YIN Jiang-yang YUAN Sheng-rong GUO | 2022 | Journal of Zhejiang University-Science A(Applied Physics & Engineering)2022，23，10： | 0 |
| 5 | Analysis and control optimization of positive pressure fluctuation in electromechanical oxygen regulator显示文摘The Electromechanical Oxygen Regulator(EMOR)is a new type of aviator oxygen equipment.Positive pressure refers to the pressure difference between the breath pressure and the ambient pressure during pressurized oxygen supply.The phenomenon of positive pressure fluctuation was believed to reduce the system performance.The current open-loop control method cannot solve this problem.In this paper,the mathematical model was established and main factors were analyzed.By combining experimental research and simulation calculation,it was determined that pressure fluctuation was caused by inlet pressure and diaphragm deformation together.With the increase of pulmonary ventilation volume,the influence of inlet pressure on fluctuation decreases gradually,while the proportion of diaphragm deformation increases rapidly.A closed-loop control strategy of Proportional Resonant with Feedforward Compensation(PRFC)was proposed to solve the problem and control parameters were obtained through co-simulation.The effectiveness of the control strategy was verified by experiments.The results show that the control strategy can enhance the anti-disturbance ability of the system and significantly reduce the pressure fluctuation range,which is beneficial to improving the overall system performance. | Rui PAN Guiping LIN Zhigao SHI Yu ZENG Xue YANG | 2021 | Chinese Journal of Aeronautics2021，34，5： | 0 |
| 6 | 射流放大器的不对称性对偏转板伺服阀零偏的影响显示文摘针对偏转板伺服阀前置级放大器结构不对称导致零偏的问题,考虑两个接收腔结构尺寸不一致以及劈尖相对射流口不对称等因素,基于二维紊动射流理论建立了偏导射流放大器压力特性数学模型,分析了两个接收腔圆角、内角、喉部宽度不一致性以及劈尖相对射流口的偏移量对放大器压力特性以及零偏位移的影响。分析结果表明:由于接收腔圆角和接收腔宽度直接决定射流流出接收腔的面积,故接收腔圆角和宽度的不对称会对放大器零件产生较大影响,两接收腔圆角差值每增大10μm,会近似产生0.33μm的零偏,而两接收腔宽度差值每增大10μm,会近似产生1μm的零偏,接收孔内角的对称性和劈尖相对射流口的偏移则对放大器的零偏影响很小。减小两接收孔圆角和宽度的加工公差可以显著降低射流放大器的零偏,并提高射流放大器的一致性。 | 张晓博 葛声宏 邹小舟 原佳阳 李双路 訚耀保 | 2024 | 阀门2024，，2： | 0 |
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