scholarly journals Modal-Energy-Based Neuro-Controller for Seismic Response Reduction of a Nonlinear Building Structure

2019 ◽  
Vol 9 (20) ◽  
pp. 4443 ◽  
Author(s):  
Seongkyu Chang ◽  
Deokyong Sung
Keyword(s):  
Control Algorithm ◽  
Structural Response ◽  
Control Signal ◽  
Control Technique ◽  
Active Mass ◽  
Active Mass Damper ◽  
Earthquake Effects ◽  
And Control ◽  
Nonlinear Behaviors ◽  
Neuro Controller

This study presents a neuro-control algorithm based on structural modal energy that outputs an optimal control signal to reduce vibration during earthquakes. The modal energy of a structure is used in the objective function during the training process of a neural network. The modal energy and control signal are then minimized by the proposed neuro-control technique. A three-story nonlinear building was installed with an active mass damper, which was used to verify the applicability of the proposed control algorithm. The El Centro earthquake was adopted to train the modal-energy-based neuro-controller. The six recorded earthquakes were employed to consider unknown earthquake effects after training. The results obtained from the proposed control algorithm were compared with those obtained from a non-controlled response and a multilayer perceptron. The numerical results show that the proposed control algorithm is quite effective in reducing the structural response and modal energy. While nonlinear hysteretic behaviors appear in the non-controlled responses, these nonlinear behaviors almost entirely disappear with control.

scholarly journals Swing-Up Problem of an Inverted Pendulum – Energy Space Approach

2020 ◽  
Vol 22 (1) ◽  
pp. 33-40
Author(s):  
Marek Balcerzak
Keyword(s):  
Numerical Simulation ◽  
Differential Evolution ◽  
Control Algorithm ◽  
Inverted Pendulum ◽  
State Constraints ◽  
Energy Space ◽  
Control Signal ◽  
And Control ◽  
Space Approach

AbstractThis paper describes a novel, energy space based approach to the swing-up of an inverted pendulum. The details of the swing-up problem have been described. Equations of the velocity-controlled have been presented. Design of the controller based on energy space notion has been elaborated. The control algorithm takes into account state constraints and control signal constraints. Parameters of the controller have been optimized by means of the Differential Evolution method. A numerical simulation of the inverted pendulum driven by the proposed controller has been conducted, its results have been presented and elaborated. The paper confirms that the proposed method results in a simple and effective swing-up algorithm for a velocity-controlled inverted pendulum with state constraints and control signal constraints.

scholarly journals Optimisation of Energy Use in Bioethanol Production Using a Control Algorithm

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 282
Author(s):  
Jarosław Knaga ◽  
Stanisław Lis ◽  
Sławomir Kurpaska ◽  
Piotr Łyszczarz ◽  
Marcin Tomasik
Keyword(s):  
Energy Consumption ◽  
Pid Controller ◽  
Control Algorithm ◽  
Control Signal ◽  
Control Algorithms ◽  
Signal Quality ◽  
Control Signals ◽  
And Control ◽  
Rectification Process

In this work, the possibility of limiting energy consumption in the manufacturing process of bioethanol to obtain biofuel was analysed. For this purpose, a control algorithm has been optimised while retaining the good quality of the control signals. New in this study is the correlation of the control algorithm not only with the signal’s quality, but also with the energy consumption in such an energy-intensive process as rectification. The rectification process in a periodic production system has been researched. The process was modelled on a test station with the distillation mixture capacity of 25 dm3. For the optimization, the following control algorithms have been applied: relay, PID and PID after modification to I-PD. The simulation was carried out on a transfer function model of the plant that has been verified on a real object, a rectification column. The simulations of energy consumption and control signal’s quality have been carried out in the Matlab®-Simulink environment after implementing the model of the research subject and control algorithms. In the simulation process, an interference signal with an amplitude of 3% and frequency of 2 mHz was used. The executed analyses of the control signal quality and the influence of the control algorithm on the energy consumption has shown some essential mutual relationships. The lowest energy consumption in the rectification process can be achieved using the I-PD controller—however, the signal quality deteriorates. The energy savings are slightly lower while using the PID controller, but the control signal quality improves significantly. From a practical point of view, in the considered problem the best control solution is the classic PID controller—the obtained energy effect was only slightly lower while retaining the good quality of the control signals.

scholarly journals On a feedback-feedforward identification control algorithm for feedback active controlled structures

2007 ◽  
Vol 29 (4) ◽  
pp. 507-516
Author(s):  
La Duc Viet ◽  
Nguyen Dong Anh
Keyword(s):  
Control Algorithm ◽  
Feedforward Control ◽  
Structural Response ◽  
Linear Quadratic Regulator ◽  
Identification Algorithm ◽  
Linear Quadratic ◽  
Lqr Control ◽  
Controlled Systems ◽  
Active Mass Damper ◽  
Feedback Algorithm

Linear quadratic regulator (LQR) is an effective method of feedback active control theory. However, the LQR control is not truly optimal because it is only a feedback algorithm, i.e. the external excitation term is ignored in the optimal equation. In a previous paper [1], the identification algorithm is presented for feedback active controlled systems to identify the excitation from the structural response measured. The aim of this paper is to propose a feedback-feedforward control algorithm using the identified excitation to improve the classical LQR control. A numerical simulation is applied to an eight story building subjected to base acceleration and controlled by active mass damper system.

Sign in / Sign up

Export Citation Format

Share Document