Accurate Error Analysis of a Satellite Tracking Control Loop System†

This article considers the problem of trajectory tracking control for a micro fixed-wing unmanned air vehicle (UAV). With Bank-to-Turn (BTT) method to manage lateral deviation control of UAV, this paper discusses the outer loop guidance system, which separates the vehicle guidance problems into lateral control loop and longitudinal control loop. Based on the kinematic model of the coordinated turning of UAV, the aircraft can track a pre-specified flight path with desired error range. Flight test results on a fixed-wing UAV have indicated that the trajectory tracking control law is quite effective.

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Model predictive control of steering torque in shared driving of autonomous vehicles

Science Progress ◽

10.1177/0036850420950138 ◽

2020 ◽

Vol 103 (3) ◽

pp. 003685042095013

Author(s):

Chunjiang Bao ◽

Jiwei Feng ◽

Jian Wu ◽

Shifu Liu ◽

Guangfei Xu ◽

...

Keyword(s):

Model Predictive Control ◽

Predictive Control ◽

Tracking Control ◽

Control Method ◽

Path Tracking ◽

Hardware In The Loop ◽

Control Loop ◽

Vehicle Model ◽

Automatic Driving ◽

Steering Torque

The current path tracking control method is usually based on the steering wheel angle loop, which often makes the driver lose control of the automatic driving control loop. In order to involve the driver in the automatic driving control loop, and to solve the vehicle path tracking control problem with system robustness and model uncertainty, this paper puts forward a steering torque control method based on model predictive control algorithm. Based on the vehicle model, this method introduces the steering system model and the steering resistance torque model, and calculates the optimal control torque of the vehicle through the real-time vehicle status, so as to make up for the model mismatch, interference and other uncertainties, and ensure the real-time participation of the driver in the automatic driving control loop. To combine the nonlinear vehicle dynamics model with the steering column model, and to take the vehicle state parameters as the feedback variables of the model predictive controller model, then input the solution of the steering superposition control rate into the vehicle model, the design of the steering controller is realized. Finally, to carry out the simulation of lane keeping based on CarSim software and Simulink control model, and the hardware in-the-loop test on the hardware in-the-loop experimental platform of CarSim/LabVIEW-RT. The simulation and test results indicate that the designed torque loop path tracking control method based on model predictive control can help the driver track the target path better.

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High precision real-time FMCW-radar signal processing performed on a levitating sphere control loop system

2018 11th German Microwave Conference (GeMiC) ◽

10.23919/gemic.2018.8335105 ◽

2018 ◽

Author(s):

Alexander Orth ◽

Timo Jaeschke ◽

Lukas Piotrowsky ◽

Nils Pohl

Keyword(s):

Signal Processing ◽

Real Time ◽

High Precision ◽

Loop System ◽

Radar Signal ◽

Radar Signal Processing ◽

Control Loop ◽

Fmcw Radar

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H∞ Tracking Control of Fuzzy Dynamic Output for Nonlinear Networked System with Packet Dropouts

Mathematical Problems in Engineering ◽

10.1155/2018/5149518 ◽

2018 ◽

Vol 2018 ◽

pp. 1-10

Author(s):

Yang Wang ◽

Jinna Li ◽

Xiaolei Ji

Keyword(s):

Output Feedback ◽

Tracking Control ◽

Closed Loop ◽

Reference Model ◽

Sufficient Conditions ◽

Fuzzy Model ◽

Loop System ◽

Dynamic Output Feedback ◽

Closed Loop System ◽

Dynamic Output

The tracking control of H∞ dynamic output feedback is proposed for the fuzzy networked systems of the same category, in which each system is discrete-time nonlinear and is missing measurable data. In other words, the loss of data packet occurs randomly in both the uplink and the downlink. The independent variables that are called the Bernoulli random variables are considered to design the loss of data packets. The method of parallel distributed compensation (PDC) in terms of the T-S fuzzy model is applied to investigate the dynamic controller of tracking control on the systems. Then, it is presented that the analytical H∞ performance of the output error between the reference model and the fuzzy model for the closed-loop system containing dynamic output feedback controller is proven. Furthermore, the achieved sufficient conditions in terms of LMIs ensure that the closed-loop system is stochastically stable in the H∞ sense. Finally, a numerical system is offered to show the effectiveness of the established technique.

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The effect of zinc orthophosphate and pH-alkalinity adjustment on metal levels leached into drinking water

Canadian Journal of Civil Engineering ◽

10.1139/l99-047 ◽

2000 ◽

Vol 27 (1) ◽

pp. 33-43 ◽

Cited By ~ 4

Author(s):

D M Churchill ◽

D S Mavinic ◽

D G Neden ◽

D M MacQuarrie

Keyword(s):

Drinking Water ◽

Treatment Options ◽

Loop System ◽

Metal Leaching ◽

Control Loop ◽

Free Standing ◽

Standing Time ◽

Copper And Zinc ◽

Metal Levels ◽

Zinc Levels

A 12-month pilot plant study was conducted to evaluate a number of corrosion control treatments to reduce metal leaching from typical household plumbing materials. A pipe loop system was used to test six treatment options, with a control loop of the characteristically soft, acidic, Greater Vancouver Water District (GVWD) water. Four pH- alkalinity combinations and two concentrations of zinc orthophosphate (0.37 mg/L and 1.0 mg/L as Zn) were studied. at regular intervals, the flowing, treated, and control waters were allowed to stagnate in the pipe loop system for 8- and 16-h periods. Following the designated standing time, water samples taken from the lead/tin solder jointed, soft copper plumbing coils, the submerged, free standing coils of 50/50 lead/tin solder, and the brass faucets, were measured for lead, copper, and zinc levels. Overall, when compared to the control loop, the pH-alkalinity treatments appeared to exacerbate metal leaching in standing samples. The zinc orthophosphate treated loops were both effective at reducing lead and copper leaching to below control levels. In general, the two standing times showed little difference in the levels of leached metals. The exception to this occurred in the higher dose zinc orthophosphate loop, which had higher copper and zinc levels at the longer standing time. Key words: copper, corrosion, drinking water, lead, zinc orthophosphate.

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