Effect of Damping Length on Dynamic Performance of Two-Stage Two-Spool Electrohydraulic Servovalve

2016 ◽  
pp. 1213-1222 ◽  
Author(s):  
Nitesh Mondal ◽  
Biswanath Datta
Keyword(s):  
Dynamic Performance ◽  
Two Stage

The Influence of a Two-Stage Valve Stem on an SFEMV System

2009 ◽  
Author(s):  
H. C. Ho ◽  
W. S. Chiang ◽  
H. P. Chen ◽  
D. M. Tsay
Keyword(s):  
Mass Distribution ◽  
Shear Force ◽  
Dynamic Performance ◽  
Current Injection ◽  
Domain Modeling ◽  
Two Stage ◽  
Injection Period ◽  
Valve Stem ◽  
The Impact ◽  
Proper Energy

In the shear force electromechanical valve (SFEMV) system, to unify and simplify the assembling process, a two-stage valve is employed. Three factors, mass distribution between the two sub-valves, the valve lash, and the direction of starting stimulation, are concerned for valve dynamic performance in the two-stage valve SFEMV system. With multi-domain modeling, eighteen cases are simulated to survey the impact of these three factors. Besides, experiments for interpretation of proper energy from the actuator are shown. To keep the energy from the actuator only used in overcoming friction, the results show that the current injection period should be precisely given, the mass of two valve stems should be the same as much as possible, and the actuator should turn to the valve closing direction at the beginning.

Dynamic Simulation and Optimization of Two-Stage Extractive Alcoholic Fermentation Process: Design Impact on Controllability

2006 ◽  
Vol 1 (1) ◽  
Author(s):  
Jobrun Nandong ◽  
Yudi Samyudia ◽  
Moses O Tadé
Keyword(s):  
Fermentation Process ◽  
Dynamic Performance ◽  
Operating Conditions ◽  
Single Stage ◽  
Extractive Fermentation ◽  
Two Stage ◽  
Stage Design ◽  
Simulation And Optimization ◽  
The Face ◽  
Two Stage Design

In this paper, we address dynamic controllability of the two different designs of extractive fermentation process, namely one-stage and two-stage designs. The operating conditions that maximize yields and productivity for both designs are determined by optimization using the method of factorial design and response surface analysis. The results show that in terms of the achievable yield and productivity, the performance of the two-stage design is comparable to that of the single-stage, but the former design leads to a significant reduction in the fermentor size required. Furthermore, we analyze the dynamic controllability of the two designs of extractive fermentation process using a so-called control relevant metrics to examine their closed-loop dynamic performance in the face of uncertainty. This analysis reveals that the single-stage design has more favorable dynamic controllability than the two-stage design.

Research on Modeling and Control Strategy for Two-Stage Photovoltaic Grid-Connected System

2014 ◽  
Vol 1008-1009 ◽  
pp. 16-21
Author(s):  
Xia Dong ◽  
Li Na Zhang ◽  
Yu Ying Fu ◽  
Cui Lian Ji
Keyword(s):  
Control Strategy ◽  
High Performance ◽  
Dynamic Performance ◽  
Mathematic Model ◽  
Two Stage ◽  
Lcl Filter ◽  
Modeling And Control ◽  
Point Tracking ◽  
Power Point ◽  
And Control

This paper has built the mathematic model of the single-phase two-stage photovoltaic(PV) grid-connected system. The model consists of a boost DC/DC converter and a DC/AC inverter with LCL filter. On the basis of the variable step perturbation and observation method(P&O), the boost converter changes the output voltage of the PV array by adjusting the duty cycle to realize the PV maximum power point tracking(MPPT). The inverter system restrains the voltage fluctuation effectively by using feed-forward of the grid voltage and current tracking control technology, which has the high performance in both sinusoidal reference tracking and disturbance rejection. LCL filter improves the dynamic performance and restrains the high harmonics efficiently. The simulation with Matlab soft confirms the effectiveness of the model and control strategy.

Research on the New Missile Electro-Hydraulic Actuation System Based on Two-Stage Speed Control Mode

2014 ◽  
Vol 551 ◽  
pp. 555-561
Author(s):  
Hui Chen ◽  
Yong Ling Fu ◽  
Juan Chen ◽  
He Song Liu
Keyword(s):  
High Performance ◽  
Dynamic Performance ◽  
Speed Control ◽  
Development Trend ◽  
Control Mode ◽  
Practical Significance ◽  
Two Stage ◽  
Actuation System ◽  
Penetration Ability ◽  
The Development Trend

The performance of missile guidance and penetration ability is determined by the missile actuation system. According to the development trend of high performance and energy saving, the new missile electro-hydraulic actuation system based on two-stage speed control mode is presented in this paper, and then the operating principle and process are discussed in detail. Finally the accurate mathematical model of the new actuation system is established, and the influence of the different basic speed on the power loss and the dynamic performance are analyzed. The simulation results show that the purposes of maintaining the dynamic performance and reducing the zero-control current are achieved. Therefore, the new proposed scheme has a certain practical significance for the future development of the missile electro-hydraulic actuation system.

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