The Effects of Time Delay and Physical Motion on Manual Flight Control: An In-Flight and Ground-Based Simulation Experiment

2010 ◽  
Vol 20 (3) ◽  
pp. 221-248 ◽  
Author(s):  
Valerie J. Gawron ◽  
Grant R. McMillan ◽  
Randall E. Bailey
Keyword(s):  
Time Delay ◽  
Flight Control ◽  
Simulation Experiment ◽  
Physical Motion

Performance of Core Exit Thermocouple for PWR Accident Management Action in Vessel Top Break LOCA Simulation Experiment at OECD/NEA ROSA Project

2008 ◽  
Author(s):  
Mitsuhiro Suzuki ◽  
Takeshi Takeda ◽  
Hideo Nakamura
Keyword(s):  
Time Delay ◽  
Large Scale ◽  
Simulation Experiment ◽  
Three Dimensional ◽  
Test Facility ◽  
Large Temperature ◽  
Energy Agency ◽  
Pressurized Water ◽  
The Core ◽  
Accident Management

Presented are experiment results of the Large Scale Test Facility (LSTF) conducted at the Japan Atomic Energy Agency (JAEA) with a focus on core exit thermocouple (CET) performance to detect core overheat during a vessel top break loss-of-coolant accident (LOCA) simulation experiment. The CET temperatures are used to start accident management (AM) action to quickly depressurize steam generator (SG) secondary sides in case of core temperature excursion. Test 6-1 is the first test of the OECD/NEA ROSA Project started in 2005, simulating withdraw of a control rod drive mechanism penetration nozzle at the vessel top head. The break size is equivalent to 1.9% cold leg break. The AM action was initiated when CET temperature rose up to 623K. There was no reflux water fallback onto the CETs during the core heat-up period. The core overheat, however, was detected with a time delay of about 230s. In addition, a large temperature discrepancy was observed between the CETs and the hottest core region. This paper clarifies the reasons of time delay and temperature discrepancy between the CETs and heated core during boil-off including three-dimensional steam flows in the core and core exit. The paper discusses applicability of the LSTF CET performance to pressurized water reactor (PWR) conditions and a possibility of alternative indicators for earlier AM action than in Test 6-1 is studied by using symptom-based plant parameters such as a reactor vessel water level detection.

scholarly journals Enhanced Disturbance-Observer-Based Control for a Class of Time-Delay System with Uncertain Sinusoidal Disturbances

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Xinyu Wen
Keyword(s):  
Time Delay ◽  
Flight Control ◽  
Disturbance Observer ◽  
Delay System ◽  
Delay Systems ◽  
Flight Control System ◽  
Control Laws ◽  
Nonlinear Disturbance Observer ◽  
Dynamic Performances ◽  
Uncertain Disturbance

This paper is concerned with disturbance-observer-based control (DOBC) for a class of time-delay systems with uncertain sinusoidal disturbances. The disturbances are decomposed as precise and uncertain parts using nonlinear disturbance observer (DO) after appropriate coordinate transformation. And then the two parts can be compensated by corresponding controller, respectively, such that the classic DOBC method is extended to uncertain disturbance rejection. One novel feature of the proposed method is that even if the precise disturbance parameters are inaccessible, the merits of DOBC can be inherited. By integrating the disturbance observers with feedback control laws with time delay, the disturbances can be rejected and the desired dynamic performances can be guaranteed. Finally, simulations for a flight control system are given to demonstrate the effectiveness of the results.

The Effects of Simulator Delays on the Acquisition of Flight Control Skills: Control of Heading and Altitude

1987 ◽  
Vol 31 (11) ◽  
pp. 1286-1290 ◽  
Author(s):  
Gary E. Riccio ◽  
Jeffrey D. Cress ◽  
William V. Johnson
Keyword(s):  
Time Delay ◽  
Flight Control ◽  
Transfer Of Training ◽  
Delay Condition ◽  
Training Phase ◽  
Mean Square ◽  
Experimental Task ◽  
Performance Control ◽  
Control Behavior ◽  
Roll Rate

The effects of simulator delays on performance, control behavior, and transfer of training were investigated with a group of subjects who had no experience with flight control tasks. Two types of aircraft were simulated: one with highly responsive dynamics and one with sluggish dynamics. Subjects were assigned to one of four time-delay conditions and to one of the two aircraft types. In the first phase of the experiment, subjects participated in fifty trials (ten trials per day) with a particular time delay (50, 100, 200, or 400 milliseconds). After this “training” phase, all subjects “transferred” to the minimum time-delay condition (50 milliseconds) for another fifty trials. The experimental task required that the subjects maintain constant heading and altitude in the presence of pseudo-random roll-rate and pitch-rate disturbances. There were statistically significant effects of time delay on root-mean-square heading and altitude errors in both the training and transfer phases of the experiment. The effect of delay on transfer of training was greater for the aircraft with sluggish dynamics.

scholarly journals Robust Fault Tolerant Control for a Class of Time-Delay Systems with Multiple Disturbances

2013 ◽  
Vol 2013 ◽  
pp. 1-8
Author(s):  
Songyin Cao ◽  
Jianzhong Qiao
Keyword(s):  
Time Delay ◽  
Flight Control ◽  
Disturbance Rejection ◽  
Fault Tolerant ◽  
Fault Tolerant Control ◽  
Delay Systems ◽  
Actuator Faults ◽  
Flight Control System ◽  
Multiple Disturbances ◽  
Fault Accommodation

A robust fault tolerant control (FTC) approach is addressed for a class of nonlinear systems with time delay, actuator faults, and multiple disturbances. The first part of the multiple disturbances is supposed to be an uncertain modeled disturbance and the second one represents a norm-bounded variable. First, a composite observer is designed to estimate the uncertain modeled disturbance and actuator fault simultaneously. Then, an FTC strategy consisting of disturbance observer based control (DOBC), fault accommodation, and a mixedH2/H∞controller is constructed to reconfigure the considered systems with disturbance rejection and attenuation performance. Finally, simulations for a flight control system are given to show the efficiency of the proposed approach.

Fault Tolerant Flight Control Based on Time Delay Control

2005 ◽  
Vol 33 (12) ◽  
pp. 54-60
Author(s):  
Jae-Hyun Jin ◽  
Chang-Sun Yoo ◽  
Hyeok Ryu ◽  
Min-Jea Tahk
Keyword(s):  
Time Delay ◽  
Flight Control ◽  
Fault Tolerant ◽  
Time Delay Control ◽  
Delay Control

Design and Verification the Simulation System of UAS Flight Control Considering the Effects of Time Delay

2013 ◽  
Vol 278-280 ◽  
pp. 1746-1753
Author(s):  
Sheng Yi Yang ◽  
Sheng Jing Tang ◽  
Chao Liu ◽  
Jie Guo
Keyword(s):  
Control System ◽  
Time Delay ◽  
Real Time ◽  
Flight Control ◽  
Simulation System ◽  
Unmanned Aircraft ◽  
Flight Control System ◽  
The Real ◽  
The Stability ◽  
Hil Simulation

It had not been explored which real-time magnitude can meet the requirement of the simulation object in computer simulation system. Taking time delay into consideration, the influence of time delay on the stability of the low-altitude and low-speed small Unmanned Aircraft Systems (UAS) flight control system had been analyzed and the real-time magnitude of the miniature hardware-in-loop (HIL) simulation system was determined. Then a miniature HIL simulation system of the UAS flight control system was designed to prove the real-time magnitude feasibility. The result shows the real-time magnitude by time delay analysis can meet the requirements of flight control system.

Comparison of Time Delay during In-Flight and Ground Simulation

1989 ◽  
Vol 33 (2) ◽  
pp. 120-123 ◽  
Author(s):  
Valerie J. Gawron ◽  
Randall E. Bailey ◽  
Louis H. Knotts ◽  
Grant R. McMillan
Keyword(s):  
Time Delay ◽  
Flight Control ◽  
Visual Cues ◽  
Flight Time ◽  
Flight Control System ◽  
Motion Cues ◽  
Flight Experiment ◽  
Flying Qualities ◽  
Instrument Meteorological Conditions ◽  
Aerodynamic Simulation

An in-flight experiment was performed to investigate the effects of time delay on manual flight control and flying qualities. The experiment was conducted using the USAF/FDL variable-stability NT-33A aircraft. Pure time delay was added equally to the pitch and roll flight control system. Evaluation tasks were presented on a head-up display (HUD). Instrument meteorological conditions (IMC) were simulated which limited the visual cues available to the pilot to the 20 degree foveal scene provided by the HUD. The in-flight time delay data were generated with full fidelity, unlimited range of motion cues. Using the same cockpit and a digital aerodynamic simulation, the in-flight experiment was completely replicated as a fixed-based ground simulation. Thus, the effects of extreme conditions in motion cuing (i.e., full motion versus no-motion) were examined for constant visual cuing.

Sign in / Sign up

Export Citation Format

Share Document