The State Key Laboratory of Fluid Power Transmission and Control

Hangzhou, China

The State Key Laboratory of Fluid Power Transmission and Control

Hangzhou, China

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Li S.,Zhejiang University | Wu P.,Zhejiang University | Cao L.,Zhejiang University | Wu D.,Zhejiang University | And 2 more authors.
Applied Thermal Engineering | Year: 2017

The transient flow and dynamic characteristics of a PWM-controlled solenoid valve are simulated by CFD to investigate the pressure control performance of the solenoid valve under PWM-controlled conditions. A group of cases with a constant valve opening but different pressure drops are used in the steady-state CFD simulations, which cover both sonic and subsonic flows. The mass flow rates obtained from CFD simulations are compared with theoretical results and show a good agreement, indicating that CFD is capable of handling the complex flows. The dynamic mesh technique is used to simulate the movement of the valve spool, and transient CFD simulations are conducted to analyze the dynamic characteristics. The responses of the control pressure and the mass flow rate to the duty-cycle variation are analyzed for 30%, 50%, and 80% duty cycles. The mean control pressure values are verified by experimental data. The flow force exerted on the spool is recorded and the transient force is compared with the steady force. The pressure wave transmission during the valve opening process is captured. The influence of the valve opening time on the control pressure is also investigated, and results show that the former can affect the mean control pressure. © 2016 Elsevier Ltd


Jiang H.-Y.,Harbin Institute of Technology | Jiang H.-Y.,The State Key Laboratory of Fluid Power Transmission and Control | Huo Y.-T.,Harbin Institute of Technology | Ren Y.-K.,Harbin Institute of Technology | And 3 more authors.
Harbin Gongye Daxue Xuebao/Journal of Harbin Institute of Technology | Year: 2011

To make up the deficiency of traditional ac electrohydrodynamics in explaining fluid flowing in opposite direction, a 3D point plane electrode system is devised to carry out microfluidic driving experiments, and the influence of electrochemistry and ac electro-thermal on microfluidic driving under low ac frequency has been analyzed. It is found that the flow direction under ac range of 10 Hz~3 MHz in the device is point to plane all the time, which is opposite to the prediction from theory of ac electro-osmotic (ACEO). The experiments verifies the leading role of electrochemical reaction under low ac frequency, and the result indicates that the leading influencing factor of the phenomenon of microfluidic under low ac frequency in point plane electrode system is electrochemistry.


Zhang C.,Yanshan University | Zhang C.,The State Key Laboratory of Fluid Power transmission and Control | Zhao J.,Yanshan University | Zhao J.,The State Key Laboratory of Fluid Power transmission and Control | And 3 more authors.
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2014

Aiming at the phenomenon of rolling over of an articulated dump truck when streering around, a semi-active hydro-pneumatic suspension system was designed based on fuzzy control with the function of anti-roll. The principles of the system were elaborated and the characteristic analysis was made with established mathematical model. It shows that the semi-active hydro-pneumatic suspension system meets the basic performance requirements in the condition of non fuzzy control. Based on this, the anti-roll analysis of the fuzzy control was also made and the simulation was applied using the fuzzy toolbox. Through simulation studies and field trials comparition, it can be concluded that the suspension system under the way of fuzzy control improves the system's anti-roll capability effectively, providing a new way of thinking for the domestic research and development of the hydro-pneumatic suspension system.


Zhao J.,Yanshan University | Zhao J.,The State Key Laboratory of Fluid Power Transmission and Control | Cheng F.,Yanshan University | Cheng F.,The State Key Laboratory of Fluid Power Transmission and Control | And 3 more authors.
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2014

A multi-domain physical model and a mathematical model were established based on analysis of the mechanical and hydraulic working mechanism of four suspensions synchronous driving system with self-propelled transporter. According to the coupling, nonlinear, model parameter uncertainty characteristics in the leveling system, a self-tuning PID-type fuzzy control based on multi-point output coupling synchronous driving algorithm was proposed, with the four suspensions cylinder actual displacement coupling value as a ideal output, by four independent fuzzy PID controller valve control cylinder was realized respectively to ideal dynamic and static real-time tracking control; The results of the test of synchronous lifting for rated load 1 MN self-propelled transporter show that four cylinder dynamic synchronization errors are within range of ±3 mm, steady synchronization errors range of ±1 mm, with the application of the new control strategy. The new control system has the higher control precision of synchronous driving and better adaptability and robustness from the contrast test.


Luan Y.,Nanjing University of Aeronautics and Astronautics | Wang H.,Nanjing University of Aeronautics and Astronautics | Wang H.,The State Key Laboratory of Fluid Power Transmission and Control | Zhao D.,Nanjing University of Aeronautics and Astronautics | And 2 more authors.
Jiqiren/Robot | Year: 2015

To accurately control a hopping robot with combustion powered linear actuator (CPLA), factors that influence the hopping-driving performance of CPLA are analyzed. Firstly, dynamic model is set up according to the working process of CPLA, and performance parameters are obtained. Nextly, how the mole ratio of oxidizer (nitrous oxide N2O) to fuel (propane C3H8) and injection pressures of the two gas influence the output performance of CPLA are analyzed by experiments. Results show that the influence do exist, when the mole ratio is 9.91, the hopping height of CPLA reaches a maximum, and a 3.17 kg hopping mechanism can hop as high as 3.2 m. CPLA energy efficiency is 8.4% and hopping efficiency is 7.01%. The CPLA outputs a high average power, and is of a large power-mass ratio during the driving hopping process. ©, 2015, Chinese Academy of Sciences. All right reserved.


Xu J.,Zhejiang University of Technology | Zhou Z.-Y.,Zhejiang University of Technology | Piao Z.-Y.,Zhejiang University of Technology | Piao Z.-Y.,The State Key Laboratory of Fluid Power Transmission and Control
Frontiers of Mechanical Engineering | Year: 2016

The accumulated damage process of rolling contact fatigue (RCF) of plasma-sprayed coatings was investigated. The influences of surface roughness, loading condition, and stress cycle frequency on the accumulated damage status of the coatings were discussed. A ball-ondisc machine was employed to conduct RCF experiments. Acoustic emission (AE) technique was introduced to monitor the RCF process of the coatings. AE signal characteristics were investigated to reveal the accumulated damage process. Result showed that the polished coating would resist the asperity contact and remit accumulated damage. The RCF lifetime would then extend. Heavy load would aggravate the accumulated damage status and induce surface fracture. Wear became the main failure mode that reduced the RCF lifetime. Frequent stress cycle would aggravate the accumulated damage status and induce interface fracture. Fatigue then became the main failure mode that also reduced the RCF lifetime. © 2016 Higher Education Press and Springer-Verlag Berlin Heidelberg


Chen H.,Fuzhou University | Chen H.,The State Key Laboratory of Fluid Power Transmission and Control | Du H.,Fuzhou University | Du H.,FUJIAN HAIYUAN
Applied Mechanics and Materials | Year: 2013

In order to improve the flow stability when wafer scans at high speed, immersion lithography with small flow-thickness is proposed for the high resolution lithography. By using the numerical methods, the immersion flow is investigated to analyze the behaviors of liquid flow. Based on the flow characteristics of typical structures with different liquid thickness and scanning speed, the liquid mean-velocity on account of thousand sample points in the exposure area are studied, and the appropriate parameters and method of effective renovation with small thickness are also given. © (2013) Trans Tech Publications, Switzerland.


Zheng J.,Zhejiang University | Zheng J.,High Pressure Equipment | Zheng J.,The State Key Laboratory of Fluid Power Transmission and Control | Zhou C.,Zhejiang University | And 9 more authors.
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | Year: 2015

An apparatus for hydrogen embrittlement testing under high-pressure gaseous hydrogen has been developed in P.R. China based on the studies on design of high-pressure hydrogen container, axial force self-balance method for the load rod, load measurement in high-pressure hydrogen, sealing in high-pressure hydrogen and systems for the refueling of hydrogen, and gas leak detection and monitoring. Slow strain rate tensile test, fatigue test, fracture toughness test, and fatigue crack growth test can be conducted under ultrahigh-pressure (140 MPa) gaseous hydrogen. The developed equipment is useful for materials selection, life prediction, and investigation on mechanism of hydrogen embrittlement. ©, 2015, Science Press. All right reserved.


Cheng F.,Yanshan University | Cheng F.,The State Key Laboratory of Fluid Power transmission and Control | Zhao J.Y.,Yanshan University | Zhao J.Y.,The State Key Laboratory of Fluid Power transmission and Control | And 3 more authors.
Applied Mechanics and Materials | Year: 2013

Noise is one of the common faults in hydraulic system. The correct analysis and deal with the noise will make for the normal operation and optimization of the system. In view of the noise of a new self-propelled transporter suspension hydraulic system produced in the debugging process of the heavy load lifting when suspension falling, by means of mechanism analysis, modeling and simulation analysis of the suspension hydraulic system, finding out the noise comes from the hydraulic component of system with SV type pilot check valve; The noise fault is caused by the improper circuit design of hydraulic system, the feasibility of the using the SL type pilot check valve to eliminate suspension hydraulic system noise proved by the simulation analysis, in the field test of the improved suspension hydraulic system, the suspension falling gentle and noise elimination, which shows that the analysis and simulation model is correct; Through the comparison and analysis on the SV type and SL type kinds of pilot check valve on the reasonable application in the hydraulic circuit isolation, that provides a theoretical basis for the correct selection two kinds of pilot check valve. © 2013 Trans Tech Publications Ltd, Switzerland.

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