Control of Forced Vibration Using Multi-Electrode Electro-Rheological Fluid Dampers

1997 ◽  
Vol 119 (4) ◽  
pp. 527-531 ◽  
Author(s):  
F. Gordaninejad ◽  
A. Ray ◽  
H. Wang
Keyword(s):  
Vibration Control ◽  
Control Systems ◽  
Forced Vibration ◽  
Electrode Surface ◽  
Closed Loop ◽  
Damping Capacity ◽  
In Series ◽  
On Line ◽  
Fluid Dampers ◽  
Proportional Controller

Vibration control of cylindrical, electro-rheological fluid (ERF) dampers were studied. Single- as well as multi-electrode cylindrical ERF dampers were designed, built and tested under a forced vibration motion. Closed-loop, on-line control systems utilizing bang-hang and linear proportional controller were implemented to control the damping capacity of the ERF dampers. In addition, the designs were modified to reduce the required activation voltage. These modifications include increasing the electrode surface area as well as the number of electrodes. The damping ability of the dampers was further enhanced by using two identical dampers in series connection.

Reliability-Based Analysis of Frequency of Closed-Loop Vibration Control Systems with Interval Parameters

2014 ◽  
Vol 644-650 ◽  
pp. 53-57
Author(s):  
Jin Gang Liu ◽  
Shi Peng Wang ◽  
Zhong Jun Zhang ◽  
Da Wei Jin ◽  
Feng Xiao Huang ◽  
...  
Keyword(s):  
Distribution Function ◽  
Vibration Control ◽  
Control Systems ◽  
Present Method ◽  
Closed Loop ◽  
Uncertain Parameters ◽  
Convex Model ◽  
Interval Parameters ◽  
Closed Loop Systems ◽  
Random Eigenvalues

Using the convex model theory, the reliability-based analysis of frequency of the vibration control problem of structures with Interval parameters is discussed. Based on the theory of perturbation method, reliability analysis, and PNET method, the method of reliability-based analysis of eigenvalues of closed-loop vibration control systems with uncertain parameters is studied. And the distribution function of the random eigenvalues will not be computed other than their means and variances. The standard deviations of eigenvalues of the uncertain closed-loop systems can be used to estimate the reliability of frequency. The numerical results show that the present method is effective.

Closed-loop on-line process identification using a proportional controller

1998 ◽  
Vol 53 (9) ◽  
pp. 1713-1724 ◽  
Author(s):  
Jin Hyun Park ◽  
Heung Il Park ◽  
In-Beum Lee
Keyword(s):  
Closed Loop ◽  
Process Identification ◽  
On Line ◽  
Line Process ◽  
Proportional Controller

Variable Damping and Stiffness Vibration Control With Two Magnetorheological Fluid Dampers in Series

2005 ◽  
Author(s):  
Yanqing Liu ◽  
Hiroshi Matsuhisa ◽  
Hideo Utsuno ◽  
Jeong Gyu Park
Keyword(s):  
Vibration Control ◽  
Vibration Isolation ◽  
Degree Of Freedom ◽  
Structural Vibration ◽  
Small Current ◽  
Mr Dampers ◽  
In Series ◽  
Variable Damping ◽  
Fluid Dampers ◽  
Two Degree Of Freedom

Vibration isolation methods that vary damping and stiffness have demonstrated excellent authority over system vibration, thus, potentially making them attractive for many applications. However, conventional devices for controlling variable stiffness are typically complicated and difficult to implement in most applications. To address this issue, a new method is proposed that requires two magnetorheological (MR) fluid dampers placed in series. With this configuration, variable damping and stiffness vibration control is simultaneously achieved by varying a small current to the MR dampers. This paper presents a theoretical and experimental analysis of a two degree-of-freedom system that is controlled by the MR dampers. Five different control schemes involving the variable damping and stiffness are explored. The time and frequency responses of the two degree-of-freedom system to a random input show that combined variable damping and stiffness control provides the best vibration isolation over a frequency range spanning the system’s two structural vibration modes. The experimental results agree well with the theoretical analysis.

Control Strategies for a Highly Loaded Biological Ammonia Elimination Process

1993 ◽  
Vol 28 (11-12) ◽  
pp. 531-538 ◽  
Author(s):  
B. Teichgräber
Keyword(s):  
Closed Loop ◽  
Control Strategies ◽  
Level Control ◽  
Sludge Dewatering ◽  
Loop Control ◽  
Reject Water ◽  
Line Measurement ◽  
Control Pattern ◽  
On Line ◽  
Treatment Facilities

A nitrification/denitrification process was applied to reject water treatment from sludge dewatering at Bottrop central sludge treatment facilities of the Emschergenossenschaft. On-line monitoring of influent and effluent turbidity, closed loop control of DO and pH, and on-line monitoring of nitrogen compounds were combined to a three level control pattern. Though on-line measurement of substrate and product showed substantial response time it could be used to operate nitrification/denitrification within process boundaries.

EEG-FES-Force-MMG closed-loop control systems of a volunteer with paraplegia considering motor imagery with fatigue recognition and automatic shut-off

2021 ◽  
Vol 68 ◽  
pp. 102662
Author(s):  
Paulo Broniera Junior ◽  
Daniel Prado Campos ◽  
André Eugenio Lazzaretti ◽  
Percy Nohama ◽  
Aparecido Augusto Carvalho ◽  
...  
Keyword(s):  
Control Systems ◽  
Motor Imagery ◽  
Closed Loop ◽  
Closed Loop Control ◽  
Loop Control
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