scholarly journals Numerical Investigation on the Dynamic Characteristics of an Adjustable Power Turbine Used in Environmental Control System

Complexity ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Qihang Lu ◽  
Qi Zhang ◽  
Dalin Zhang ◽  
Zhihan Lv
Keyword(s):  
Control System ◽  
Environmental Control ◽  
Specific Change ◽  
Output Torque ◽  
System P ◽  
Power Turbine ◽  
Simulation Results ◽  
The Stability ◽  
Turbine Output ◽  
Nozzle Opening

In this paper, the environmental control system of aircraft driven by a power turbine is further analyzed. Through the numerical simulation of the change of the bleed state under different flight conditions and the change of the flow field under different nozzle opening, the simulation results are verified by the experimental results, and the specific change rules of the power turbine output torque, power, and bleed flow are obtained. It is analyzed quantitatively that adjusting the adjustable nozzle ring can keep the output power stable, widen the flight envelope, and improve the stability of the environmental control system.

The Optimum Adaptive Cooperative Control of the Vehicle Steering and Anti-Lock Braking System

2013 ◽  
Vol 387 ◽  
pp. 288-291
Author(s):  
Guo Li ◽  
Huan Liu
Keyword(s):  
Control System ◽  
Cooperative Control ◽  
Control Algorithm ◽  
Analytical Form ◽  
Error Model ◽  
Braking System ◽  
Simulation Results ◽  
Antilock Braking ◽  
The Stability

In this paper, a new two-level cooperative control system is proposed for the vehicles steering antilock braking stability fields. The architecture is composed with the execution layer with anti-lock brake control system and the cooperation layer developed on a new cooperative error model. It is quite feasible because of its analytical form. Finally, the stability and the validity of the control algorithm are validated by simulation results.

Design of PI Controller With Three-Loop Structure for Power Balance of Turboshaft

2014 ◽  
Author(s):  
Chao Yang ◽  
Xi Wang ◽  
Mengni Liu ◽  
Ruijun Shi ◽  
Shihuang Gao
Keyword(s):  
Control System ◽  
Inequality Constraints ◽  
Pi Controller ◽  
Pole Placement ◽  
Linear Matrix ◽  
Control Loops ◽  
Output Torque ◽  
Pi Controllers ◽  
The Stability ◽  
Regional Pole Placement

Turboshaft control systems are designed to keep the stability of helicopter, which requires that the powerturbine rotor speed remains constant. Furthermore, the power provided by each engine on the same aircraft is probably not equal if the control system provides the same fuel to each one. In this paper, a control loop aiming at balancing engine output torque and load system demand torque was added in the traditional speed-control system. Then a new structure of PI controller was developed with three control loops. Besides, the research showed this control system could be improved to keep the output torque of each engine equal to deal with the different performance degradations of different engines. Finally, the parameters of PI controllers in this control system were achieved by constructing and solving linear matrix inequality constraints based on the theory of regional pole placement for closed-loop system.

Simulation and Application of Fuzzy Control System with Integrator

2011 ◽  
Vol 418-420 ◽  
pp. 1825-1828
Author(s):  
Ping Li ◽  
Chang Feng Yan ◽  
Ling Ke Zeng ◽  
Xiao Su Cheng
Keyword(s):  
Control System ◽  
Fuzzy Control ◽  
Control Systems ◽  
Practical Experience ◽  
System Stability ◽  
Static Error ◽  
Fuzzy Control System ◽  
Simulation Results ◽  
The Stability

This article simulated fuzzy control system by using MATLAB and compared the normal fuzzy control system with the fuzzy control system which has an integrator. Further more, the influence of quantize factors, proportional factors and integral constants on system was studied. The simulation results show that static error always exists in normal fuzzy control systems and proportional factors influence the stability of the system greatly. Put an integrator into a fuzzy control system, and static error can be eliminated and the system stability can be improved. The conclusion of simulation and practical experience, use fuzzy control system with integrator in reality. It can get good results.

scholarly journals Principle of Stable Running of an Unicycle Robot

2002 ◽  
Vol 14 (1) ◽  
pp. 37-45
Author(s):  
Takayuki Tanaka ◽  
◽  
Hisanobu Suzuki ◽  
Kazuo Tanaka
Keyword(s):  
Control System ◽  
Postural Stability ◽  
Control Method ◽  
Power Source ◽  
Motor Drives ◽  
Direction Control ◽  
Simulation Results ◽  
Electric Cables ◽  
The Stability ◽  
Extension Cable

In previous papers, we reported the world's first success in the driving of a human-riding-type unicycle with postural stability. However, the robotic unicycle was connected with a computer, motor drives, and a power source through electric cables. It was made clear by our experiments that the stability and dynamic behavior of the unicycle were largely affected by these extension cables, and the driving distance was also limited. This paper reports the development of an extension cable-less unicycle including the design of its control system and the principle of unicycle running. Firstly, an improved unicycle without extension cables is designed. Secondly, the principle of unicycle running is elucidated by simulations and experiments using the developed robot. Lastly, we propose a new control method including yaw-direction control. Experimental and simulation results show that the proposed method is effective for the developed unicycle robot to realize human-like stable motions.

Study on Range of the Sampling Period of the Electro-Hydraulic Position Sampling Control System Based on PLC

2010 ◽  
Vol 152-153 ◽  
pp. 58-62
Author(s):  
He Ying Bian ◽  
Yan Hui Wang
Keyword(s):  
Control System ◽  
Closed Loop ◽  
Simulation Analysis ◽  
Sampling Period ◽  
System Stability ◽  
Practical Significance ◽  
Theory Of Sampling ◽  
Actual Operation ◽  
Simulation Results ◽  
The Stability

The paper built electro-hydraulic position closed-loop sampling control system based on PLC, established mathematical model of this system by applying theory of sampling control and determines the range of the sampling period T under the stability of the system according to system stability theory. Then carried out simulation analysis and experimental verification in the range of T, provided with the method determined the range of sampling period. The results showed that simulation results of this model were consistent with the actual operation of the system , the method and sampling period be chosen have some practical significance.

The Research of Extruded Pressure Auto-Adjustment Method in Abrasive Flow Polishing

2014 ◽  
Vol 1027 ◽  
pp. 203-207
Author(s):  
Ming Yu Wu ◽  
Hang Gao
Keyword(s):  
Control System ◽  
Pressure Difference ◽  
Proportional Control ◽  
Abrasive Flow Machining ◽  
Small Pressure ◽  
Simulation Results ◽  
Set Up ◽  
The Stability ◽  
Abrasive Flow Polishing ◽  
Polishing Pressure

Aiming at the quality problems of ‘over polishing’ and ‘insufficient polishing’ in the process of traditional extrusion abrasive flow machining,An abrasive flow polishing method at the constantly small pressure difference is developed, the hydraulic proportional control system is designed, and the mathematical modeling of the hydraulic proportional control system for small pressure difference constant extrusion polishing abrasive flow machining is set up. The simulation results show that the polishing pressure can be well controlled and the stability of polishing velocity is improved, which will improve the extrusion abrasive flow polishing quality.

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