Performance Evaluation of Centralized Control Algorithm for Channel Allocation in Pico-Cell System

2007 ◽  
Author(s):  
Kenya Yonezawa ◽  
Kosuke Yamazaki ◽  
Takashi Inoue
Keyword(s):  
Performance Evaluation ◽  
Control Algorithm ◽  
Channel Allocation ◽  
Cell System ◽  
Centralized Control

An automatic system for a helicopter autopilot performance evaluation

2019 ◽  
Vol 91 (6) ◽  
pp. 880-885 ◽  
Author(s):  
Antoni Kopyt ◽  
Sebastian Topczewski ◽  
Marcin Zugaj ◽  
Przemyslaw Bibik
Keyword(s):  
Performance Evaluation ◽  
Flight Control ◽  
Automatic System ◽  
Control Algorithm ◽  
Linear Quadratic Regulator ◽  
Algorithm Analysis ◽  
Evaluation Methodology ◽  
Reference Trajectory ◽  
Linear Quadratic ◽  
Content Type

Purpose The purpose of this paper is to elaborate and develop an automatic system for automatic flight control system (AFCS) performance evaluation. Consequently, the developed AFCS algorithm is implemented and tested in a virtual environment on one of the mission task elements (MTEs) described in Aeronautical Design Standard 33 (ADS-33) performance specification. Design/methodology/approach Control algorithm is based on the Linear Quadratic Regulator (LQR) which is adopted to work as a controller in this case. Developed controller allows for automatic flight of the helicopter via desired three-dimensional trajectory by calculating iteratively deviations between desired and actual helicopter position and multiplying it by gains obtained from the LQR methodology. For the AFCS algorithm validation, the objective data analysis is done based on specified task accomplishment requirements, reference trajectory and actual flight parameters. Findings In the paper, a description of an automatic flight control algorithm for small helicopter and its evaluation methodology is presented. Necessary information about helicopter dynamic model is included. The test and algorithm analysis are performed on a slalom maneuver, on which the handling qualities are calculated. Practical implications Developed automatic flight control algorithm can be adapted and used in autopilot for a small helicopter. Methodology of evaluation of an AFCS performance can be used in different applications and cases. Originality/value In the paper, an automatic flight control algorithm for small helicopter and solution for the validation of developed AFCS algorithms are presented.

Bio-electrochemical conversion of industrial wastewater-COD combined with downstream methanol synthesis – an economic and life cycle assessment

2018 ◽  
Vol 20 (12) ◽  
pp. 2742-2762 ◽  
Author(s):  
J. Streeck ◽  
C. Hank ◽  
M. Neuner ◽  
L. Gil-Carrera ◽  
M. Kokko ◽  
...  
Keyword(s):  
Life Cycle Assessment ◽  
Performance Evaluation ◽  
Life Cycle ◽  
Environmental Performance ◽  
Industrial Wastewater ◽  
Cell System ◽  
Electrolysis Cell ◽  
Microbial Electrolysis Cell ◽  
Electrochemical Conversion ◽  
Environmental Performance Evaluation

Herein, a techno-economic and environmental performance evaluation (i.e. Life Cycle Assessment (LCA)) of a 45 kW Microbial Electrolysis Cell system is presented in the context of industrial wastewater conversion.

Robust Control of Hydrogen Flow for an Automotive Fuel Cell System via Model Reference Adaptive Control

2019 ◽  
Author(s):  
Janghwan Hwang ◽  
Sangseok Yu
Keyword(s):  
Adaptive Control ◽  
Fuel Cell ◽  
Flow Control ◽  
Control Algorithm ◽  
Cell System ◽  
Pi Control ◽  
Pwm Control ◽  
Fuel Cell System ◽  
Hydrogen Flow ◽  
Automotive Fuel

Abstract Efficient hydrogen flow control is of great importance to ensure the reliable operation of an automotive fuel cell system because it is closely associated with the safety and the economic efficiency. In this study, an effective hydrogen flow control algorithm for hydrogen excess ratio control is addressed by pointing out the recovery speed and overshoot response. Unlike previous studies on the hydrogen management systems of an automotive fuel cell, this study presents an analytic hydrogen tank model which can present the characteristics of the discharge and charge of hydrogen from a type 4 hydrogen tank. To this end, a mode reference adaptive control (MRAC) based on proportional-integral (PI) control is introduced, to ensure robust hydrogen flow during the dynamic operation of fuel cell system. The MRAC was compared with the nominal PI control and PWM control in the hydrogen management system of an automotive fuel cell operating within normal conditions, under steady-state responses and transient. Based on these result, it can further demonstrate that the MRAC algorithm shows better recovery speed and tracking performance than the nominal PI, and PWM control algorithm with respect to the transient behaviors.

scholarly journals Performance Evaluation of Fuel Cell System for Marine Use

2020 ◽  
Vol 55 (6) ◽  
pp. 789-795
Author(s):  
Hiroyuki Murata ◽  
Taimei Miyagawa ◽  
Satoshi Hattanda
Keyword(s):  
Performance Evaluation ◽  
Fuel Cell ◽  
Cell System ◽  
Fuel Cell System
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