Resonant dynamics of a single degree-of-freedom mechanical system under stiffness switching control with time-delay

2019 ◽  
Vol 8 (2) ◽  
pp. 396-403
Author(s):  
Ranit Senapati ◽  
S. Chatterjee
Keyword(s):  
Time Delay ◽  
Mechanical System ◽  
Switching Control ◽  
Degree Of Freedom ◽  
Single Degree Of Freedom ◽  
Single Degree ◽  
Resonant Dynamics

Analytical research on a single degree-of-freedom semi-active oscillator with time delay

2012 ◽  
Vol 19 (12) ◽  
pp. 1895-1905 ◽  
Author(s):  
Yong-Jun Shen ◽  
Shao-Pu Yang ◽  
Hai-Jun Xing ◽  
Cun-Zhi Pan
Keyword(s):  
Time Delay ◽  
Degree Of Freedom ◽  
Single Degree Of Freedom ◽  
Single Degree ◽  
Analytical Research

Resonances of a Nonlinear Single-Degree-of-Freedom System with Time Delay in Linear Feedback Control

2010 ◽  
Vol 65 (5) ◽  
pp. 357-368 ◽  
Author(s):  
Atef F. El-Bassiouny ◽  
Salah El-Kholy
Keyword(s):  
Steady State ◽  
Time Delay ◽  
Feedback Control ◽  
Fixed Points ◽  
Multiple Scales ◽  
Degree Of Freedom ◽  
Linear Feedback ◽  
Single Degree Of Freedom ◽  
Single Degree ◽  
Subharmonic Resonances

The primary and subharmonic resonances of a nonlinear single-degree-of-freedom system under feedback control with a time delay are studied by means of an asymptotic perturbation technique. Both external (forcing) and parametric excitations are included. By means of the averaging method and multiple scales method, two slow-flow equations for the amplitude and phase of the primary and subharmonic resonances and all other parameters are obtained. The steady state (fixed points) corresponding to a periodic motion of the starting system is investigated and frequency-response curves are shown. The stability of the fixed points is examined using the variational method. The effect of the feedback gains, the time-delay, the coefficient of cubic term, and the coefficients of external and parametric excitations on the steady-state responses are investigated and the results are presented as plots of the steady-state response amplitude versus the detuning parameter. The results obtained by two methods are in excellent agreement

Loop Shaping for Transparency and Stability Robustness in Time-Delayed Bilateral Telemanipulation

2004 ◽  
Vol 126 (3) ◽  
pp. 650-656 ◽  
Author(s):  
Kevin B. Fite and ◽  
Michael Goldfarb ◽  
Angel Rubio
Keyword(s):  
Time Delay ◽  
Communication Channels ◽  
Smith Predictor ◽  
Degree Of Freedom ◽  
Single Degree Of Freedom ◽  
Single Degree ◽  
Stability Robustness ◽  
Loop Shaping ◽  
And Performance ◽  
Control Methodology

This paper presents a control methodology that provides transparency and stability robustness in bilateral telemanipulation systems that include a significant time delay in the communication channels. The method utilizes an adaptive Smith predictor to compensate for the time delay, and incorporates a previously published loop shaping approach to design a compensator for transparency and stability robustness of the loop. The method is experimentally demonstrated on a single degree-of-freedom telemanipulation system, and is shown to effectively provide stability and performance robustness.

Optimization of PID controller parameters for active control of single degree of freedom structures

2019 ◽  
Vol 5 (4) ◽  
pp. 130
Author(s):  
Serdar Ulusoy ◽  
Sinan Melih Niğdeli ◽  
Gebrail Bekdaş
Keyword(s):  
Time Delay ◽  
Active Control ◽  
Pid Controller ◽  
Structural Model ◽  
Degree Of Freedom ◽  
Control Force ◽  
Single Degree Of Freedom ◽  
Single Degree ◽  
Near Fault ◽  
Optimum Parameters

In active control of structures, the parameters of controllers used application must be perfectly tuned. In that case, a good vibration reduction performance can be obtained without a stability problem. During the tuning process, the limit of control force and time delay of controller system must be considered for applicable design. In the study, the optimum parameters of Proportional-Derivative-Integral (PID) type controllers that are proportional gain (K), integral time (Ti) and derivative time (Td) were optimized by using teaching learning-based optimization (TLBO). TLBO is a metaheuristic algorithm imitating the teaching and learning phases of education in classroom. The optimization was done according to the responses of the structure under a directivity pulse of near fault ground motions. In the study, time delay was considered as 20 ms and the optimum parameters of PID controller for a single degree of freedom (SDOF) structural model was found for different control force limits. The performances and feasibility of the method were evaluated by using sets of near fault earthquake records.

A Numerical Model to Reproduce Vortex Induced Vibrations of a Circular Cylinder

2006 ◽  
Author(s):  
Marco Belloli ◽  
Giorgio Diana ◽  
Ferruccio Resta ◽  
Sara Muggiasca
Keyword(s):  
Numerical Model ◽  
Circular Cylinder ◽  
Mechanical System ◽  
Wind Velocity ◽  
Experimental Tests ◽  
Degree Of Freedom ◽  
Single Degree Of Freedom ◽  
Single Degree ◽  
Vortex Induced Vibrations ◽  
Linear Mechanical System

This article describes a numerical model to reproduce vortex induced vibrations of a circular cylinder. It consists in a single degree of freedom non linear mechanical system, with characterizing parameters identified on the basis of experimental tests in order to reproduce the main features of VIV, in particular vibration amplitudes as function of wind velocity and the energy introduction by the blowing fluid into the mechanical system.

ADAMS-Based Vibrating Subsoiler System Simulation Analysis

2011 ◽  
Vol 128-129 ◽  
pp. 42-45
Author(s):  
Li Li Xin ◽  
Ji Hui Liang ◽  
Li Chun Qiu
Keyword(s):  
Dynamic Analysis ◽  
Mechanical System ◽  
Vibration Frequency ◽  
Simulation Analysis ◽  
System Simulation ◽  
Degree Of Freedom ◽  
Single Degree Of Freedom ◽  
Single Degree ◽  
Acting Force ◽  
Advance Speed

For the vibrating subsoiler, considering the material acting force, the system is simplified as a single degree of freedom weight-spring-damp model which will simulate the vibrating subsoiler system based on Automatic Dynamic Analysis of Mechanical System (ADAMS). The analysis result shows that the vibrating subsoiler can not perform well under conditions of high vibration frequency and advance speed.

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