An alternative feedback structure for the adaptive active control of time‐varying periodic or time‐varying narrow‐band disturbance

1997 ◽  
Vol 101 (5) ◽  
pp. 3122-3122
Author(s):  
Martin Bouchard ◽  
Bruno Paillard
Keyword(s):  
Active Control ◽  
Narrow Band ◽  
Time Varying ◽  
Feedback Structure

Real-Time Tuning of Delayed Resonator-Based Absorbers for Spectral and Spatial Variations

2018 ◽  
Vol 141 (2) ◽  
Author(s):  
Ryan Jenkins ◽  
Nejat Olgac
Keyword(s):  
Real Time ◽  
Active Control ◽  
Design Guidelines ◽  
Spatial Variations ◽  
Time Varying ◽  
Vibration Absorption ◽  
Spatial Tuning ◽  
System Components ◽  
Hybrid Concept ◽  
Time Variations

This paper offers two interlinked contributions in the field of vibration absorption. The first involves an active tuning of an absorber for spectral and spatial variations. The second contribution is a set of generalized design guidelines for such absorber operations. “Spectral” tuning handles time-varying excitation frequencies, while “spatial” tuning treats the real-time variations in the desired location of suppression. Both objectives, however, must be achieved using active control and without physically altering the system components to ensure practicality. Spatial tuning is inspired by the concept of “noncollocated vibration absorption,” for which the absorber location is different from the point of suppression. This concept is relatively under-developed in the literature, mainly because it requires the use of part of the primary structure (PS) as the extended absorber—a delicate operation. Within this investigation, we employ the delayed resonator (DR)-based absorber, a hybrid concept with passive and active elements, to satisfy both tuning objectives. The presence of active control in the absorber necessitates an intriguing stability investigation of a time-delayed dynamics. For this subtask, we follow the well-established methods of frequency sweeping and D-subdivision. Example cases are also presented to corroborate our findings.

Active Control of Fabricating Nanofibrous Wavy/Helical Arrays Using Near-Field Electrospinning

2018 ◽  
Author(s):  
Xiangyu You ◽  
Ping Guo
Keyword(s):  
Active Control ◽  
Process Parameters ◽  
Electric Field Distribution ◽  
Structural Parameters ◽  
Near Field ◽  
Stretchable Electronics ◽  
Time Varying ◽  
Photovoltaic Devices ◽  
Feature Size ◽  
Experimental Process

A novel and simple near-field electrospinning (NFES) method has been developed to fabricate wavy or helical nanofibrous arrays. By alternating the electrostatic signals applied on auxiliary-electrodes (AE), the structural parameters of deposited patterns can be actively controlled. Compared with the traditional electrospinning methods based on the bending and buckling effects or collector movement, the proposed method shows advantages in the controllability, accuracy, and minimal feature size. Forces operating on the electrospinning jet and the time-varying electric field distribution were analyzed to explain the kinematics of the jet. Nanoscale wavy and helical patterns with various structural parameters were fabricated. The effects of experimental process parameters on structural parameters of deposited patterns were analyzed to demonstrate the controllability of our method in fabricating wavy or helical nanofibrous structures. It is envisioned that this method will benefit the applications in the field of photovoltaic devices, sensors, transducers, resonators, and stretchable electronics.

scholarly journals Benchmark on adaptive regulation—rejection of unknown/time-varying multiple narrow band disturbances

2013 ◽  
Vol 19 (4) ◽  
pp. 237-252 ◽  
Author(s):  
Ioan Doré Landau ◽  
Abraham Castellanos Silva ◽  
Tudor-Bogdan Airimitoaie ◽  
Gabriel Buche ◽  
Mathieu Noe¨
Keyword(s):  
Narrow Band ◽  
Time Varying ◽  
Adaptive Regulation

Narrow‐band and broadband active control in an enclosure using energy density sensors

1998 ◽  
Vol 104 (3) ◽  
pp. 1756-1756
Author(s):  
John W. Parkins ◽  
Jiri Tichy ◽  
Scott D. Sommerfeldt
Keyword(s):  
Energy Density ◽  
Active Control ◽  
Narrow Band

scholarly journals Indirect adaptive regulation strategy for the attenuation of time varying narrow-band disturbances applied to a benchmark problem

2013 ◽  
Vol 19 (4) ◽  
pp. 313-325 ◽  
Author(s):  
Tudor-Bogdan Airimiţoaie ◽  
Abraham Castellanos Silva ◽  
Ioan Doré Landau
Keyword(s):  
Narrow Band ◽  
Time Varying ◽  
Benchmark Problem ◽  
Adaptive Regulation
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