✦ LIBER ✦

A NEW PERSPECTIVE FOR SEMI-AUTOMATED STRUCTURAL VIBRATION CONTROL

✍ Scribed by N. JALILI

Publisher: Elsevier Science
Year: 2000
Tongue: English
Weight: 241 KB
Volume: 238
Category: Article
ISSN: 0022-460X
DOI: 10.1006/jsvi.2000.3210

No coin nor oath required. For personal study only.

✦ Synopsis

The development of an innovative approach for optimum vibration suppression of #exible structures is presented. Utilizing concurrent use of semi-active and active subsections, an intelligent semi-automated alternative is suggested. By altering the adjustable structural properties (in semi-active unit) and control parameters (in active unit), a search is conducted to minimize an objective function subject to constraints, which may re#ect performance characteristics. In practice, a user-in-the-loop interprets the resulting performance. A number of options may then be initiated: altering the parameters of the semi-active unit, or re-tuning the control parameters in the active unit, or concurrently adjusting the two. An essential component of this strategy is handling the parametric variations within the system. In order to increase the absorber e$ciency against such variations an identi"cation process is utilized in sequence with an optimization for re-tuning the absorber. The feasibility of the re-tuning procedure and performance improvement is demonstrated via simulations for a singledegree-of-freedom (s.d.o.f.) system. It is shown that concurrent adjustment of structural properties and control re-tuning signi"cantly improves the vibration suppression quality.

📜 SIMILAR VOLUMES

A Semi-active Controller For Excessive T

A Semi-active Controller For Excessive Transient Vibrations Of Light Structures

✍ S. Cao; S.E. Semercigil 📂 Article 📅 1994 🏛 Elsevier Science 🌐 English ⚖ 529 KB

A semi-active controller for excessive transient vibrations of resonant flexible structures is presented. The suggested controller technique is based upon using an impact damper with a variable clearance. Numerical simulations were employed to investigate the design parameters. Simple experiments we

A Class of Semi-Active Suspension Scheme

A Class of Semi-Active Suspension Schemes for Vehicle Vibration Control

✍ F. Oueslati; S. Sankar 📂 Article 📅 1994 🏛 Elsevier Science 🌐 English ⚖ 524 KB

As a compromise between passive and active suspensions, a semi-active (SA) suspension scheme is suggested and demonstrated for both 1- and 4-degree-of-freedom (DOF) vehicle models. Because only limited number of vehicle aspects can be studied using a 1-DOF model, a more comprehensive 4-DOF model is

A NEW DUAL-REACTION MASS DYNAMIC VIBRATI

A NEW DUAL-REACTION MASS DYNAMIC VIBRATION ABSORBER ACTUATOR FOR ACTIVE VIBRATION CONTROL

✍ R.A. Burdisso; J.D. Heilmann 📂 Article 📅 1998 🏛 Elsevier Science 🌐 English ⚖ 250 KB

A new passive/active dynamic vibration absorber is proposed for structural vibration control. The device consists of two reaction-masses attached to the primary structure through elastic elements. The active force pair is applied between these two reaction masses. This configuration should be contra

New perspectives for ecological flow det

New perspectives for ecological flow determination in semi-arid regions: a preliminary approach

✍ Bernardo, J.M. ;Alves, M.H. 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 71 KB 👁 2 views

Streams in semi-arid regions, such as the south of Portugal, have highly seasonal flow regimes with a marked pattern of low or zero flow during summer and early autumn. As a result, throughout these months, most rivers have long dry reaches with occasional pools. The biotic communities have evolved

Stability of a Lyapunov Controller for a

Stability of a Lyapunov Controller for a Semi-active Structural Control System with Nonlinear Actuator Dynamics

✍ Jeffrey L. Kuehn; Harold L. Stalford 📂 Article 📅 2000 🏛 Elsevier Science 🌐 English ⚖ 156 KB

We investigate semi-active control for a wide class of systems with scalar nonlinear semi-active actuator dynamics and consider the problem of designing control laws that guarantee stability and provide sufficient performance. Requiring the semi-active actuator to satisfy two general conditions, we

Automated electron diffraction tomograph

Automated electron diffraction tomography – a new tool for nano crystal structure analysis

✍ U. Kolb; E. Mugnaioli; T. E. Gorelik 📂 Article 📅 2011 🏛 John Wiley and Sons 🌐 English ⚖ 389 KB

## Abstract Automated electron Diffraction Tomography (ADT) comprises an upcoming method for “ab intio” structure analysis of nano crystals. ADT allows fine sampling of the reciprocal space by sequential collection of electron diffraction patterns while tilting a nano crystal in fixed tilt steps ar