Integrated speed/synchrophasing control of turboprop engine

2018 ◽  
Vol 122 (1253) ◽  
pp. 1038-1050 ◽  
Author(s):  
X. Zhao ◽  
X. Huang ◽  
T. Zhang ◽  
Y. Wang
Keyword(s):  
Phase Fluctuation ◽  
Great Influence ◽  
Phase Control ◽  
Control Precision ◽  
Turboprop Engine ◽  
Control Scheme ◽  
Control Transformation ◽  
Reduction Effect ◽  
Control Accuracy ◽  
Speed Response

ABSTRACTPropeller synchrophasing control is an active method to reduce the noise and vibration of turboprop aircraft without additional weight and power. Phase control accuracy has a great influence on the noise reduction effect of synchrophasing. An integrated power/speed/synchrophasing control strategy is proposed to improve the control precision. Speed/phase control transformation logic based on a multi-blade phase plane is adopted which can take both the rapidity of speed response and phase control precision into account, but there exists switching oscillation during the mode transform process. In order to suppress the phase fluctuation due to exterior disturbance, a slave-slave control scheme is provided to take place of a master-slave scheme. Simulation results based on an integrated turboprop engine/propeller real-time non-linear model show that speed/phase integration logic can improve the response rapidity of both the speed and phase. The precision of the control system is verified to be in acceptable range.

Research on Control Precision of the Neutron Bandwidth Chopper

2012 ◽  
Vol 220-223 ◽  
pp. 1077-1083 ◽  
Author(s):  
Li Ru Zhao ◽  
Xiao Zhang Zhang ◽  
Kai Zhang ◽  
Tong Zhang
Keyword(s):  
Dynamic Balance ◽  
Tracking Error ◽  
Pulse Signal ◽  
Phase Tracking ◽  
Control Precision ◽  
Technical Requirements ◽  
Control Scheme ◽  
Precision Phase ◽  
Synchronous Pulse ◽  
Control Accuracy

Operation of neutron bandwidth limiting chopper requires high controlling precision. Phase difference between the chopper rotor and the synchronous pulse signal should be maintained to be fixed. Rotating frequency of the rotor needs to be very stable. To achieve the above technical requirements, control scheme, dynamic balance, and other means are made. Thus influences to control accuracy are effectively reduced, which are from rotor asymmetry and neutron absorbing materials. In the case described in this paper, phase tracking error was controlled under ±0.10752°with 90% confidence for the designed chopper.

scholarly journals A Novel Single-switch Phase Controlled Wireless Power Transfer System

Electronics ◽  
2018 ◽  
Vol 7 (11) ◽  
pp. 281 ◽  
Author(s):  
Xin Liu ◽  
Nan Jin ◽  
Xijun Yang ◽  
Khurram Hashmi ◽  
Dianguan Ma ◽  
...  
Keyword(s):  
Wireless Power Transfer ◽  
Phase Control ◽  
Constant Current ◽  
Power Transfer ◽  
Wireless Power ◽  
Effective Implementation ◽  
Active Rectifier ◽  
Switching Patterns ◽  
Control Scheme ◽  
Wireless Power Transfer System

Battery charging is a fundamental application of Wireless Power Transfer (WPT) systems that requires effective implementation of Constant Current (CC) and Constant Voltage (CV) power conduction modes. DC-DC converters used in WPT systems utilize large inductors and capacitors that increase the size and volume of the system in addition to causing higher DC losses. This work proposes a novel single-switch active rectifier for phase controlled WPT systems that is smaller in volume and weight as compared to conventional WPT topologies. The proposed method simplifies the control scheme using improved Digital Phase Control (DPC) and Analog Phase Control (APC) to realize the CC and CV power transfer modes. Furthermore, it prevents forward voltage losses in Silicon Carbide (SiC) switches and shoot through states with improved switching patterns. Simulation studies and experimental results are added to verify the effectiveness of the proposed methodology.

Design of a Microwave Applicator for Water Sterilization Using Multiobjective Optimization and Phase Control Scheme

2011 ◽  
Vol 47 (5) ◽  
pp. 1242-1245 ◽  
Author(s):  
Diogo B. Oliveira ◽  
Elson J. Silva ◽  
Jésus J. S. Santos ◽  
Oriane M. Neto
Keyword(s):  
Multiobjective Optimization ◽  
Phase Control ◽  
Control Scheme ◽  
Microwave Applicator

The Impact Analysis of Digital Controller Hardware Parameters of AMB on Control Precision

2012 ◽  
Vol 150 ◽  
pp. 111-115
Author(s):  
Yu Min Yang ◽  
Xi Ping Wang ◽  
Li Guo ◽  
Man Fan
Keyword(s):  
Digital Control ◽  
Impact Analysis ◽  
Control Model ◽  
Magnetic Bearing ◽  
Numerical Control ◽  
Digital Controller ◽  
Numerical Control System ◽  
Control Precision ◽  
The Impact ◽  
Control Accuracy

Digital control circuit for the hardware components, the impact of parameters on the control precision is analyzed. The digital control model is derived according to the requirements control of magnetic bearing system in this paper .Control accuracy and the prediction of control accuracy can be achieved by he theoretical estimates when numerical control system is given .For the future, it provides a simple and efficient method for estimating control accuracy of numerical controller.

scholarly journals Fuzzy Sliding Mode Control Method for AUV Buoyancy Regulation System

Complexity ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Wende Zhao ◽  
Decheng Wang ◽  
Zhenzhong Chu ◽  
Mingjun Zhang
Keyword(s):  
Sliding Mode Control ◽  
Autonomous Underwater Vehicle ◽  
Control Method ◽  
Sliding Mode ◽  
Regulation System ◽  
Fuzzy Sliding Mode Control ◽  
Mode Control ◽  
Control Scheme ◽  
Fuzzy Sliding Mode ◽  
Control Accuracy

This paper investigates the control problem of the buoyancy regulation system for autonomous underwater vehicle (AUV). There are some problems to be considered in the oil-water conversion-based buoyancy regulation system, including the external seawater pressure, the pressure fluctuations, and the slow switching speed of the ball valve. The control accuracy of the buoyancy regulation under the traditional PID controller cannot meet the requirements of the project. In this paper, a fuzzy sliding mode control scheme is developed for the buoyancy regulation system to solve the abovementioned problems. At first, a mathematical model of the buoyancy regulation system is established, and the stability of the system is analyzed. Then, the sliding mode control algorithm is combined with the fuzzy system to improve the control accuracy. Finally, the pool-experiment results on a prototype show that the developed control scheme can meet the requirements of the control accuracy for the buoyancy regulation system.

Research on Synchronous Control Technique of the Tube Hydroforming

2012 ◽  
Vol 233 ◽  
pp. 142-145
Author(s):  
Jin Yu ◽  
Deng Xu ◽  
Guo Qing Huang
Keyword(s):  
Control Strategy ◽  
Iterative Learning Control ◽  
Tube Hydroforming ◽  
Great Influence ◽  
Learning Control ◽  
Iterative Learning ◽  
Control Technique ◽  
Important Indicator ◽  
Synchronous Control ◽  
Control Accuracy

Synchronous control accuracy of side-cylinders of the hydroforming press is a very important indicator , it has a great influence on the quality of products. Generally, people take PID control strategy to improve the precision of hydroforming press. In this paper, a mathematical model of the side-cylinders’ hydraulic system is established and the PID and iterative learning control strategy is used, respectively, to find which one is better . The results show that the iterative learning control strategy has a higher synchronous control accuracy.

Feedback Control of a Flexible Micro-Displacement Manipulator

2011 ◽  
Vol 480-481 ◽  
pp. 1167-1172
Author(s):  
Hua Wei Ji ◽  
Yong Qing Wen ◽  
Chen Ming Fu
Keyword(s):  
Mathematical Method ◽  
Closed Loop ◽  
Input Voltage ◽  
Flexure Hinge ◽  
Output Displacement ◽  
Control Precision ◽  
Hysteresis Nonlinearity ◽  
Vibration Experiment ◽  
The Relationship ◽  
Control Accuracy

Micro-displacement manipulator consists of piezoelectric actuator and flexure hinge is being widely used in precision positioning technology for its high resolution of displacement, high stiffness and fast frequency response. However, the hysteresis nonlinearity of actuator and vibration limited its control accuracy. In order to improve the positioning precision, the relationship between input voltage and output displacement was studied, the hysteresis nonlinearity was described by mathematical method, and a closed-loop controller was proposed to control the hysteresis and vibration. Experiment results revealed the proposed closed-loop controller can enhance the control precision of micro-displacement manipulator.

A Dual-Fuzzy Pressure Compensation Based Symmetric Control Scheme of Single-Rod Electro-Hydraulic Actuator

2013 ◽  
Vol 816-817 ◽  
pp. 379-384
Author(s):  
Li Peng Wang ◽  
Jun Zheng Wang ◽  
Yu Dong He ◽  
Jiang Bo Zhao
Keyword(s):  
Fast Response ◽  
Open Loop ◽  
Hydraulic Actuator ◽  
Fuzzy Pid Controller ◽  
Control Precision ◽  
Compact Size ◽  
Control Scheme ◽  
Pressure Feedback ◽  
Pressure Compensation ◽  
Feedback Algorithm

In hydraulic robots, single-rod electro-hydraulic actuator is widely employed for fast response, small size-to-power ratio, large output force and compact size. The differences of open loop gains and other parameters make the dynamic characteristics of two moving directions asymmetric in symmetric valve controlled asymmetric cylinder system. To ensure robots moving smoothly and improve control precision, a novel pressure compensation based symmetric control scheme is proposed. Pressure feedback algorithm is mathematically proved feasible. Therefore, a displacement and pressure signals fused fuzzy PID controller is designed. Simulation results verify the feasibility and validity for compensating the asymmetric problems.

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