scholarly journals Exploratory analysis of an optimal variable speed control system for a recurrently congested freeway bottleneck

2014 ◽  
Vol 49 (2) ◽  
pp. 195-209 ◽  
Author(s):  
Xianfeng Yang ◽  
Yang Carl Lu ◽  
Gang-Len Chang
Keyword(s):  
Control System ◽  
Speed Control ◽  
Exploratory Analysis ◽  
Variable Speed ◽  
Speed Control System ◽  
Freeway Bottleneck ◽  
Variable Speed Control

Research on Power Regulation Schedule Control System for Turboprop Engine

2018 ◽  
Vol 0 (0) ◽  
Author(s):  
Tianqian Xia ◽  
Xianghua Huang
Keyword(s):  
Control System ◽  
Steady State ◽  
Fuel Consumption ◽  
Reference Model ◽  
Sliding Mode ◽  
Speed Control ◽  
Variable Speed ◽  
Turboprop Engine ◽  
Speed Control System ◽  
Variable Speed Control

Abstract A method of variable speed control system for turboprop engine is presented in this paper. Firstly, the steady operation state of turboprop engine is analyzed, and the operating line is figured out in the steady state characteristic diagram, which is the design basis of Engine Thrust Management System (ETMS). Secondly, the reference model sliding mode multivariable control is used to design the control law to follow the speed instructions given by ETMS. Finally, the optimization of the minimum fuel consumption operating curve is realized, and the control system designed is applied to a numerical model of a turboprop engine. The simulation results show that compared with the constant speed control system, the variable speed control system can reduce the specific fuel consumption by 2.37 % on average and 3.1 % in steady state conditions. Furthermore, the method can enable the pilot to manipulate the turboprop aircraft by using only one throttle lever, which can greatly reduce the pilot operation burden.

Variable Speed Control and Programming of Stepper Motor in Numerical Control System

2013 ◽  
Vol 860-863 ◽  
pp. 2682-2685
Author(s):  
Wang Xi ◽  
Yang Sun
Keyword(s):  
Control System ◽  
High Speed ◽  
Control Method ◽  
Speed Control ◽  
Pulse Frequency ◽  
Numerical Control ◽  
Stepper Motor ◽  
Numerical Control System ◽  
Variable Speed ◽  
Variable Speed Control

When Stepper motor was running at high speed, it often appears out of step phenomenon. For numerical control system can control feed pulse frequency by best way, two variable speed control method and programming are analyzed in this paper. There are uniform accelerated (decelerate) and variable accelerated (decelerate), and they can done change speed process automatically by software.

Speed Control System for Variable Speed Fixed-Pitch Wind Turbine Based on Internal Model Control

2015 ◽  
Vol 719-720 ◽  
pp. 330-335
Author(s):  
Gan Sheng Zhang ◽  
Wei Xie ◽  
Xiang Jun Li ◽  
Bo Li
Keyword(s):  
Control System ◽  
Wind Turbine ◽  
Internal Model ◽  
External Disturbance ◽  
Speed Control ◽  
Internal Model Control ◽  
Variable Speed ◽  
Model Control ◽  
Speed Control System ◽  
Fixed Pitch

The paper deals with speed control system design for variable speed fixed-pitch (VS-FP) wind turbine based on improved internal model control. The design procedure includes two steps: first nominal controller is considered that the VS-PF wind turbine works well around its operating point; second, a stable compensator is designed to reject the influence of external disturbance on the control performance when external disturbance occurs. Finally, a numerical simulation is presented to illustrate the efficiency of the proposed method.

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