Optimum Pulse Control of Flexible Structures

1981 ◽  
Vol 48 (3) ◽  
pp. 619-626 ◽  
Author(s):  
S. F. Masri ◽  
G. A. Bekey ◽  
T. K. Caughey
Keyword(s):  
Control Method ◽  
Flexible Structures ◽  
Open Loop ◽  
Response Threshold ◽  
Distributed Parameter ◽  
Open Loop Control ◽  
Pulse Control ◽  
Loop Control ◽  
Pulse Characteristics ◽  
Active Control Method

A simple yet efficient active control method is presented for reducing the oscillations of distributed parameter systems subjected to arbitrary dynamic environments. Following determination that some specified response threshold has been exceeded, an open-loop control pulse is applied. The optimum pulse characteristics are determined analytically so as to minimize a non-negative cost function related to the structure energy. The proposed control method is shown to be reliable in consistently mitigating the response of realistic multidegree-of-freedom systems, whether linear or nonlinear, subject to arbitrary stochastic or deterministic excitation.

Positioning of Pneumatic Actuator Using Open-Loop System

2015 ◽  
Vol 816 ◽  
pp. 160-164
Author(s):  
Ivan Virgala ◽  
Michal Kelemen ◽  
Erik Prada ◽  
Tomáš Lipták
Keyword(s):  
Mathematical Model ◽  
Control Method ◽  
Open Loop ◽  
Pneumatic Actuator ◽  
Open Loop Control ◽  
Open Loop System ◽  
Precise Positioning ◽  
Loop Control ◽  
Experimental Stand ◽  
Loop Control System

In the paper, we experimentally analyze a pneumatic actuator and possibilities of piston positioning. Paper shows mathematical model of pneumatic actuator. Actuator is experimentally tested and therefor experimental stand is assembled for the purposes of positioning of actuator piston. The changing parameters during the experiment are weight of load and pneumatic pressure. The results show how these parameters can have influence on precise positioning of pneumatic actuator. For experiment there is purposely used open loop control system. The aim of the study is not to show control method for positioning but to show influence of mentioned parameters.

On the Accuracy of End-Point Trajectory Tracking for Flexible Arms by Noncausal Inverse Dynamic Solutions

1991 ◽  
Vol 113 (2) ◽  
pp. 320-324 ◽  
Author(s):  
H. Moulin ◽  
E. Bayo
Keyword(s):  
Flexible Structures ◽  
Open Loop ◽  
Open Loop Control ◽  
Inverse Dynamic ◽  
Element Discretization ◽  
Loop Control ◽  
End Point ◽  
Flexible Arm ◽  
Single Link ◽  
Flexible Arms

The problem of open-loop control of the end-point trajectory of a single-link flexible arm by an inverse dynamic solution is addressed in this paper. A finite element discretization of the system is used to obtain a set of ordinary differential equations describing the motion. Theoretical difficulties pertaining to the inverse problem for flexible structures are exposed, and it is shown that a noncausal solution for the actuating torque enables a tracking of an arbitrary tip displacement with any desired accuracy.

Melnikov-Based Open-Loop Control of Escape for a Class of Nonlinear Systems

1997 ◽  
Vol 119 (3) ◽  
pp. 590-594 ◽  
Author(s):  
Emil Simiu ◽  
Marek Franaszek
Keyword(s):  
Stochastic Systems ◽  
Control Method ◽  
Open Loop ◽  
Heteroclinic Orbits ◽  
Time Interval ◽  
Open Loop Control ◽  
Loop Control ◽  
Random Forcing ◽  
Scale Factors ◽  
System Properties

The performance of certain nonlinear stochastic systems is deemed acceptable if during a specified time interval, the systems have sufficiently low probabilities of escape from a preferred region of phase space. We propose an open-loop control method for reducing these probabilities. The method is applicable to stochastic systems whose dissipation- and excitation-free counterparts have homoclinic or heteroclinic orbits. The Melnikov relative scale factors are system properties containing information on the frequencies of the random forcing spectral components that are most effective in inducing escapes. Numerical simulations show that substantial advantages can be achieved in some cases by designing control systems that take into account the information contained in the Melnikov scale factors.

Asymptotic Solution and Trajectory Planning for Open-Loop Control of Mobile Robots

2017 ◽  
Vol 139 (5) ◽  
Author(s):  
Alan Whitman ◽  
Garrett Clayton ◽  
Alexander Poultney ◽  
Hashem Ashrafiuon
Keyword(s):  
Mobile Robots ◽  
Trajectory Planning ◽  
Control Method ◽  
Open Loop ◽  
Order Correction ◽  
Reference Trajectory ◽  
Open Loop Control ◽  
Loop Control ◽  
First Order ◽  
First Order Correction

A novel open-loop control method is presented for mobile robots based on an asymptotic inverse dynamic solution and trajectory planning. The method is based on quantification of sliding by a small nondimensional parameter. Asymptotic expansion of the equations yields the dominant nonslip solution along with a first-order correction for sliding. A trajectory planning is then introduced based on transitional circles between the robot initial states and target reference trajectory. The transitional trajectory ensures smooth convergence of the robot states to the target reference trajectory, which is essential for open-loop control. Experimental results with a differential drive mobile robot demonstrate the significant improvement of the controller performance when the first-order correction is included.

Adaptive Open Loop Control for a Class of Distributed Parameter Systems

1977 ◽  
Vol 10 (5) ◽  
pp. 309-317
Author(s):  
Marcel Amouroux ◽  
Jean Pierre Babary ◽  
Abdelhaq El Jaï
Keyword(s):  
Distributed Parameter Systems ◽  
Open Loop ◽  
Distributed Parameter ◽  
Open Loop Control ◽  
Loop Control
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