scholarly journals An Experimental Tuning Approach of Fractional Order Controllers in the Frequency Domain

2020 ◽  
Vol 10 (7) ◽  
pp. 2379 ◽  
Author(s):  
Isabela Birs ◽  
Silviu Folea ◽  
Ovidiu Prodan ◽  
Eva Dulf ◽  
Cristina Muresan
Keyword(s):  
Fractional Order ◽  
Vibration Suppression ◽  
Experimental Tests ◽  
Closed Loop System ◽  
Control Engineering ◽  
Proportional Integral ◽  
Active Vibration Suppression ◽  
Smart Beam ◽  
Active Vibration ◽  
Set Up

Fractional calculus has been used intensely in recent years in control engineering to extend the capabilities of the classical proportional–integral–derivative (PID) controller, but most tuning techniques are based on the model of the process. The paper presents an experimental tuning procedure for fractional-order proportional integral–proportional derivative (PI/PD) and PID-type controllers that eliminates the need of a mathematical model for the process. The tuning procedure consists in recreating the Bode magnitude plot using experimental tests and imposing the desired shape of the closed loop system magnitude. The proposed method is validated in the field of active vibration suppression by using an experimental set-up consisting of a smart beam.

scholarly journals A Comparison between Integer and Fractional Order PDμ Controllers for Vibration Suppression

2016 ◽  
Vol 1 (1) ◽  
pp. 273-282 ◽  
Author(s):  
Isabela R. Birs ◽  
Cristina I. Muresan ◽  
Silviu Folea ◽  
Ovidiu Prodan
Keyword(s):  
Frequency Domain ◽  
Cantilever Beam ◽  
Fractional Order ◽  
Vibration Suppression ◽  
Fractional Order Control ◽  
Control Approach ◽  
Active Vibration Suppression ◽  
Derivative Type ◽  
Active Vibration ◽  
Airplane Wing

AbstractAlong the years, unwanted vibrations in airplane wings have led to passenger discomfort. In this study, the airplane wing is modeled as a cantilever beam on which active vibration suppression is tested. The paper details the tuning of both integer and fractional order Proportional Derivative type controllers based on constraints imposed in the frequency domain. The controllers are experimentally validated and the results prove once more the superiority of the fractional order control approach.

scholarly journals A simple and novel control strategy for semi-active vibration suppression by a magnetorheological damper

2021 ◽  
pp. 1045389X2110322
Author(s):  
Shuto Nagamatsu ◽  
Toshihiko Shiraishi
Keyword(s):  
Control Strategy ◽  
High Performance ◽  
Vibration Suppression ◽  
Experimental Tests ◽  
Magnetorheological Damper ◽  
Damping Force ◽  
Active Vibration Suppression ◽  
Small Structure ◽  
Active Vibration ◽  
Improved Performance

Conventional skyhook-based ON–OFF control switches the damping force on a vibration suppression target according to the sign of the product of the target and relative velocities (which is called the condition function). Here, we propose a control strategy that uses a novel condition function for improved performance. The proposed strategy is formulated based on the theory of forced vibration with base excitation. Its effect upon semi-active vibration performance is investigated via numerical simulations and experimental tests of the vibration suppression of a small structure equipped with a magnetorheological (MR) damper. In the simulations, the proposed control strategy can offer high-performance semi-active vibration suppression, even in the presence of force delays in the damper. The experiments show that the displacement response with the proposed control is lower than that with the conventional skyhook-based control over the entire frequency range; furthermore, the desired performance can be achieved when the proposed condition function is used with velocity-proportional control. The simplicity and high performance demonstrated by the proposed control strategy make it applicable to semi-active vibration suppression of practical systems, even in the presence of unavoidable force delays in controllable dampers.

scholarly journals Active Fractional-Order Sliding Mode Control of Flexible Spacecraft Under Actuators Saturation

2021 ◽  
Author(s):  
milad alipour ◽  
Maryam Malekzadeh ◽  
alireza ariaei
Keyword(s):  
Fractional Order ◽  
Attitude Control ◽  
Vibration Suppression ◽  
Sliding Mode ◽  
Fixed Time ◽  
Flexible Spacecraft ◽  
Terminal Sliding Mode ◽  
Damping Matrix ◽  
Active Vibration Suppression ◽  
Active Vibration

Abstract In this article, a novel multi-purpose modified fractional-order nonsingular terminal sliding mode (MFONTSM) controller is designed for the flexible spacecraft attitude control and appendages passive vibration suppression, assuming the control torque saturation in the system dynamics. Furthermore, an active FONTSM controller is proposed separately to perform active vibration suppression of the flexible appendages using piezoelectric actuators. The fixed-time stability of the closed-loop system for both the passive and active controllers is analyzed and proved using the Lyapunov theorem. Finally, the performance of the proposed controllers has been tested in the presence of uncertainties, external disturbances, and the absence of the damping matrix in order to study the effectiveness of the proposed method.

Sign in / Sign up

Export Citation Format

Share Document