Closed-loop scheduling and control of waterborne AGVs for energy-efficient Inter Terminal Transport

2017 ◽  
Vol 105 ◽  
pp. 261-278 ◽  
Author(s):  
Huarong Zheng ◽  
Rudy R. Negenborn ◽  
Gabriël Lodewijks
Keyword(s):  
Energy Efficient ◽  
Closed Loop ◽  
Loop Scheduling ◽  
And Control

scholarly journals Stability of Optimal Closed-Loop Cleaning Scheduling and Control with Application to Heat Exchanger Networks under Fouling

Processes ◽  
2020 ◽  
Vol 8 (12) ◽  
pp. 1623
Author(s):  
Federico Lozano Santamaria ◽  
Sandro Macchietto
Keyword(s):  
Heat Exchanger ◽  
Closed Loop ◽  
Operating Cost ◽  
Optimization Procedure ◽  
Loop Model ◽  
Loop Scheduling ◽  
Loop Optimization ◽  
Trade Offs ◽  
Heat Exchanger Networks ◽  
And Control

Heat exchanger networks subject to fouling are an important example of dynamic systems where performance deteriorates over time. To mitigate fouling and recover performance, cleanings of the exchangers are scheduled and control actions applied. Because of inaccuracy in the models, as well as uncertainty and variability in the operations, both schedule and controls often have to be revised to improve operations or just to ensure feasibility. A closed-loop nonlinear model predictive control (NMPC) approach had been previously developed to simultaneously optimize the cleaning schedule and the flow distribution for refinery preheat trains under fouling, considering their variability. However, the closed-loop scheduling stability of the scheme has not been analyzed. For practical closed-loop (online) scheduling applications, a balance is usually desired between reactivity (ensuring a rapid response to changes in conditions) and stability (avoiding too many large or frequent schedule changes). In this paper, metrics to quantify closed-loop scheduling stability (e.g., changes in task allocation or starting time) are developed and then included in the online optimization procedure. Three alternative formulations to directly include stability considerations in the closed-loop optimization are proposed and applied to two case studies, an illustrative one and an industrial one based on a refinery preheat train. Results demonstrate the applicability of the stability metrics developed and the ability of the closed-loop optimization to exploit trade-offs between stability and performance. For the heat exchanger networks under fouling considered, it is shown that the approach proposed can improve closed-loop schedule stability without significantly compromising the operating cost. The approach presented offers the blueprint for a more general application to closed-loop, model-based optimization of scheduling and control in other processes.

Closed-Loop Scheduling and Control for Precision Irrigation

2019 ◽  
Vol 58 (26) ◽  
pp. 11485-11497 ◽  
Author(s):  
Jannatun Nahar ◽  
Su Liu ◽  
Yawen Mao ◽  
Jinfeng Liu ◽  
Sirish L. Shah
Keyword(s):  
Closed Loop ◽  
Loop Scheduling ◽  
And Control ◽  
Precision Irrigation

Payload sway suppression in rotary cranes by digital filtering of the commanded inputs

2003 ◽  
Vol 217 (2) ◽  
pp. 99-109 ◽  
Author(s):  
G Glossiotis ◽  
I Antoniadis
Keyword(s):  
Energy Efficient ◽  
Degrees Of Freedom ◽  
Closed Loop ◽  
Finite Impulse Response ◽  
Dynamic Modelling ◽  
Practical Application ◽  
Loop Control ◽  
Rotary Crane ◽  
Time And Energy ◽  
And Control

A method is proposed for the suppression of the sway of rotary crane payloads. In contrast to closed-loop control methods which encounter significant practical application problems, the proposed method is based simply on the preprocessing of all the commanded crane inputs by a properly designed finite impulse response (FIR) filter. A four-degrees-of-freedom (4DOF) model for the rotary crane system is considered, incorporating both the hoisting and the slewing motions and thus able to handle cases where hoisting can be simultaneously applied to the rotary motion. Although the resulting dynamic system is strongly non-linear and time varying, the method is shown effectively to suppress, in a quite robust, time and energy efficient way, both the transient as well as the residual sway of the payload. Moreover, additional advantages of the proposed method are that no dynamic modelling of the crane is required, and that the applicability of the method is quite easy and general, without the need for any additional instrumentation and control equipment.

scholarly journals Design, Construction, and Control for an Underwater Vehicle Type Sepiida

Robotica ◽  
2020 ◽  
pp. 1-18
Author(s):  
M. Garcia ◽  
P. Castillo ◽  
E. Campos ◽  
R. Lozano
Keyword(s):  
Embedded System ◽  
Closed Loop ◽  
Underwater Vehicle ◽  
Mathematical Representation ◽  
Closed Loop System ◽  
Vehicle Type ◽  
Mathematical Equations ◽  
And Control ◽  
Design Construction

SUMMARY A novel underwater vehicle configuration with an operating principle as the Sepiida animal is presented and developed in this paper. The mathematical equations describing the movements of the vehicle are obtained using the Newton–Euler approach. An analysis of the dynamic model is done for control purposes. A prototype and its embedded system are developed for validating analytically and experimentally the proposed mathematical representation. A real-time characterization of one mass is done to relate the pitch angle with the radio of displacement of the mass. In addition, first validation of the closed-loop system is done using a linear controller.

scholarly journals Closed-loop Scheduling in a canned food factory

2020 ◽  
Vol 53 (2) ◽  
pp. 10791-10796
Author(s):  
C.G. Palacín ◽  
C. Vilas ◽  
A.A. Alonso ◽  
José L. Pitarch ◽  
C. de Prada
Keyword(s):  
Closed Loop ◽  
Loop Scheduling ◽  
Canned Food
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