scholarly journals Unmanned cruciform winged glider dynamics and control

2018 ◽  
pp. 55-60
Author(s):  
M. A. Polishchuk ◽  
M. V. Polishchuk
Keyword(s):  
Control Structure ◽  
Longitudinal Axis ◽  
Operating Conditions ◽  
Flight Performance ◽  
Autonomous Flight ◽  
Flight Phase ◽  
Ratio Effect ◽  
Dynamics And Control ◽  
And Control ◽  
Wing Aspect Ratio

Tha paper focuses on the problems of unmanned cruciform winged glider dynamics and control in autonomous flight conditions, and studies the wing aspect ratio effect on its flight performance. The winged glider control structure in the longitudinal and lateral axes is proposed. We carried out a comparative analysis of the ballistic flight ranges of models of different configurations, as well as the flight ranges of models of different configurations in the operating conditions of the control system of the proposed structure. As a result, the structure of the unmanned winged glider targeting system is proposed. The targeting system in the longitudinal axis, unlike the samples used in currently operating models, consists of two subsystems responsible for the unmanned winged glider best range gliding at the first flight phase and the direct aimpoint guidance at the second, i.e. final, flight stage

Autonomous Flight Control of Unmanned Small Hobby-Class Helicopter Report 2: Modeling Based on Experimental Identification and Autonomous Flight Control Experiments

2003 ◽  
Vol 15 (5) ◽  
pp. 546-554 ◽  
Author(s):  
Kensaku Hazawa ◽  
◽  
Jinok Shin ◽  
Daigo Fujiwara ◽  
Kazuhiro Igarashi ◽  
...  
Keyword(s):  
Flight Control ◽  
Position Control ◽  
Control Structure ◽  
Controller Design ◽  
Autonomous Flight ◽  
Velocity Models ◽  
Single Output ◽  
Hover Control ◽  
Function Models ◽  
And Control

We developed a small autonomous hobby-class unmanned helicopter that weighs about 9 kg, focusing on attitude and velocity models and controller design. Simge Input Single Output (SISO) transfer function models are derived from brief kinematical analysis and system identification for each of the helicopter dynamics of pitch, roll, yaw, and three direction velocities. We designed six separate controllers based on derived models using LQG and LQI control theory. The models and control structure are verified by experimental results. Accurate position control, namely, hover control and trajectory-following control, is achieved by a simple control algorithm using a designed attitude and velocity control structure. Robustness of the controller against wind was confirmed in a windy-day experiment. To verify robustness against the perturbation of physical helicopter parameters, the controller is applied to a larger helicopter.

Dynamics and control of the Czochralski process II. Objectives and control structure design

1988 ◽  
Vol 91 (1-2) ◽  
pp. 199-217 ◽  
Author(s):  
Michael A. Gevelber ◽  
George Stephanopoulos ◽  
Michael J. Wargo
Keyword(s):  
Control Structure ◽  
Structure Design ◽  
Dynamics And Control ◽  
And Control ◽  
Czochralski Process

scholarly journals Dynamics and Control of a Free-Piston Diesel Engine

2003 ◽  
Vol 125 (3) ◽  
pp. 468-474 ◽  
Author(s):  
Tor A. Johansen ◽  
Olav Egeland ◽  
Erling Aa. Johannessen ◽  
Rolf Kvamsdal
Keyword(s):  
Diesel Engine ◽  
Control Structure ◽  
Piston Motion ◽  
Free Piston ◽  
Control Approach ◽  
Engine Design ◽  
Dynamics And Control ◽  
Scale Test ◽  
Freely Moving ◽  
And Control

Free-piston diesel engines are characterized by freely moving pistons without any crankshaft or camshaft connected to the pistons. This allows a compact and efficient engine design, but requires automatic control of the piston motion. This paper present a dynamic mathematical model of a free-piston diesel engine, and a control oriented dynamic analysis leading to a piston motion control structure. Experimental results using a full scale test cylinder are included and show feasibility of the suggested control approach.

From Research to Didactics: The Course of Dynamics and Control of Fluid Machines for Automation Engineering Students

2008 ◽  
Author(s):  
M. Venturini ◽  
M. Morini
Keyword(s):  
Dynamic Behavior ◽  
Engineering Students ◽  
Student Evaluation ◽  
Operating Conditions ◽  
Student Feedback ◽  
System Control ◽  
Control Logic ◽  
Dynamics And Control ◽  
The University ◽  
And Control

The paper deals with the course “Dynamics and Control of Fluid Machines”, which has been held at the Faculty of Engineering of the University of Ferrara (Italy) since the academic year 2002/2003 for the Second-Level Degree Course in Computer Sciences and Automation Engineering. The aim of the course is the study of fluid machines, by combining base knowledge with physical-mathematical analysis of the unsteady behavior and of off-design operating conditions. The first characteristic aspect of the course is the study of the dynamic behavior of fluid machines. The second relevant aspect is the analysis of system control. In this paper, course characteristics are presented and discussed. In particular, as a part of the final examination, students are asked to develop an individual project, whose results are also reported in this paper. The project consists of the simulation of the dynamic behavior of an industrial system for compressed air production by means of a multistage centrifugal compressor. Students are required to properly design the controller and to discuss the adopted control logic. Student feedback is evaluated by means of a survey conducted to evaluate the quality of the didactic activity. The analysis of student feedback reveals that student evaluation towards the course proves higher than the “average” evaluation for the didactic activity held at the University of Ferrara, at the Faculty of Engineering or within the same Degree Course.

Study of the Control Systems of a Distillation Process Equipped with Heat Pump

2018 ◽  
Vol 69 (9) ◽  
pp. 2535-2540
Author(s):  
Cristian Patrascioiu ◽  
Marian Popescu
Keyword(s):  
Control Systems ◽  
Dynamic Simulation ◽  
Heat Pump ◽  
Control Structure ◽  
Operating Conditions ◽  
Modelling And Simulation ◽  
Distillation Process ◽  
Industrial Control ◽  
Starting Point ◽  
And Control

The paper presents the results of the researches on the modelling and simulation of the propylene-propane mixture distillation process equipped with heat pump. Industrial data regarding the process structure, operating data and control structure are presented. Modelling and simulation of the process was accomplished using the resources of the Unisim Design simulator. Because the simulator does not include a mathematical model associated with the distillation process equipped with heat pump, the distillation column model was replaced with the Reboiled Absorber model from the simulation environment library. An analysis of the multivariable character of the distillation process revealed discrepancies between the structure determined by the Relative Gain Array analysis and the industrial control structure. The design of the control systems requires dynamic simulation of the process, so the authors� research was focused on the dynamic simulation of the absorption process. The obtained dynamic model was the starting point for testing the propylene quality control system. Finally, the optimal operating conditions for this process were analyzed.

Nonlinear dynamics and control of helicopter ground resonance

2021 ◽  
pp. 107754632199693
Author(s):  
Jayachandran Warrier ◽  
Shaikh Faruque Ali
Keyword(s):  
Control Strategies ◽  
Operating Conditions ◽  
Magnetorheological Damper ◽  
Mechanical Instability ◽  
Logic Control ◽  
Ground Resonance ◽  
Dynamics And Control ◽  
Bang Bang Control ◽  
And Control ◽  
Lag Dampers

Ground resonance is an aero-mechanical instability in helicopters that use soft in-plane rotors. Traditionally, ground resonance is mitigated by using passive lead–lag dampers that provide sufficient in-plane damping. However, these dampers because of their passive nature cannot adapt to all operating conditions. In this work, a magnetorheological fluid–based semi-active lead–lag damper is proposed to offer controllable damping. Two nonlinear control strategies are reported to operate the voltage to be supplied to the magnetorheological damper. The first strategy is a model-based control using dynamic inversion. The second is a fuzzy logic control integrated with a particle swarm optimization algorithm to optimize the control parameters. Both control strategies are shown to be effective in eliminating ground resonance. Unlike bang–bang control, the prescribed control algorithms can make use of complete voltage level available in the magnetorheological damper with smooth voltage updates. A comparative study of the controller performances is made through appropriate performance indices and system responses. Finally, the most optimum control strategy to mitigate ground resonance is inferred.

scholarly journals Dynamics and Control Structure for NPID Controller

2021 ◽  
Vol 1116 (1) ◽  
pp. 012141
Author(s):  
Aditi Saxena ◽  
Jitendra Kumar ◽  
Reeya Agrawal
Keyword(s):  
Control Structure ◽  
Dynamics And Control ◽  
And Control
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