Information-measuring control system of active vibration protection RED

Лысенко, А. В.; Goryachev, N. V.; Yurkov, N. К.; Telegin, Aleksei M.; Trusov, V. A.

doi:10.1109/ewdts.2016.7807740

Cited by 8 publications

(5 citation statements)

References 5 publications

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“…To choose the type of correlation, with the closest approximation to the data in the form of experimental graphs, the dependency is approximated using the following models [7], [9]- [11]:…”

Section: Stress Concentration Modelmentioning

confidence: 99%

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Models of Printed Circuit Boards Conductive Pattern Defects

Danilova

Кочегаров

Yurkov

et al. 2018

Applied Computer Systems

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A number of PCB defects, though having passed successfully the defect identification procedure, can potentially grow into critical defects under the influence of various external and (or) internal influences. The complex nature of the development of defects leading to PCB failures demands developing and updating the data measuring systems not only for detection but also for the prediction of future development of PCB defects considering the external influences. To solve this problem, it is necessary to analyse the models of defect development, which will allow predicting the defect growth and working out the mathematical models for their studies. The study uses the methods of system analysis, theory of mathematical and imitation modelling, analysis of technological systems. The article presents four models for determining the theoretical stress concentration factor for several types of common defects, considering the strength loss of PCB elements. For each model the evaluation of parameters determining its quality is also given. The formulas are given that link the geometry of defects and the stress concentration factor, corresponding to four types of defects. These formulas are necessary for determining the number of cycles and time to failure, fatigue strength coefficient. The chosen models for determining the values of the stress concentration factor can be used as a database for identifying PCB defects. The proposed models are used for software implementation of the optical image inspection systems.

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“…To choose the type of correlation, with the closest approximation to the data in the form of experimental graphs, the dependency is approximated using the following models [7], [9]- [11]:…”

Section: Stress Concentration Modelmentioning

confidence: 99%

“…Defect: Pit in the form of a circular hole (Fig. 4) in the centre of the conductor [11], [15]. True for the whole range of change .…”

Section: Models For Determining the Theoretical Stress Concentramentioning

confidence: 99%

Models of Printed Circuit Boards Conductive Pattern Defects

Danilova

Кочегаров

Yurkov

et al. 2018

Applied Computer Systems

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“…The said systems reduce vibrations and noise by dissipating the energy as heat [25]. Such a system consists of a spring (elastic element) and an energy damper [26,27]. Elastomers, liquids or negative stiffness elements may be used as well.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Research on Low-frequency Vibration Isolation Tables

Viselga

Turla

Tetsman

et al. 2023

mech

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In the paper, an establishment of dynamic characteristics of tabletops of the newly-developed optical tables is being discussed upon. Low-frequency vibration isolation systems are reviewed. Theoretical and experimental tests have been performed. Dynamic models of an optical table on a vibrating platform at different excitations have been developed, the dynamic displacement and the resonance frequencies of the system have been established and vibration transmissibility curves have been presented. The obtained dynamic characteristics of the mechanical passive low-frequency vibration isolation system show that such a system is able to isolate the vibrations effectively. The results of the performed experimental tests confirm the data of the theoretical research.

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“…Advances in construction methods and materials have led to more flexible structures, thereby raising the demand on reducing vibrations caused by natural hazards. Such vibrations can be mitigated through the incorporation of supplemental damping devices, including passive [1,2], semi-active [3,4,5] and active [6,7] systems. Of interest to this paper are passive systems, which have been widely accepted by the field due to their mechanical robustness and mitigation performance without necessitating external power [8].…”

Section: Introductionmentioning

confidence: 99%

Development and validation of a nonlinear dynamic model for tuned liquid multiple columns dampers

Cao

Gong

Ubertini

et al. 2020

Journal of Sound and Vibration

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The tuned liquid column damper (TLCD), a passive damping device consisting of a large U-tube with oscillating liquid, has been shown to be effective at mitigating structural responses under natural hazards. Aside from their bandwidth-limited mitigation capabilities, a key limitation of TLCDs is in their large geometries that occupy large space often at prime locations. A solution is to implement multicolumned versions, termed tuned liquid multiple columns dampers (TLMCDs), which have the potential to be tuned to multiple frequencies and occupy less space by leveraging the multiple columns to allow fluid movement. However, mathematical models characterizing their dynamic behavior must be developed enabling proper tuning and sizing in the design process. In this paper, a new analytical model characterizing a TLMCD as a multiple degrees-of-freedom coupled nonlinear system is presented. The frequencies of free vibration and vibration modes of a TLMCD are identified in closed-form formulations. Results are validated using computational fluid dynamics simulations, and show that the analytical model can predict the damper's liquid surface movements as well as its capability to reduce structural vibration when the structure is subjected to harmonic excitations. A parametric study is conducted to investigate the effect of head loss coefficients, column spacing, cross-section area ratios, and column numbers on mitigating structural response. It is found that, while TLMCDs are less effective than traditional TLCDs under an equal liquid mass, they can provide enhanced performance under geometric restrictions.

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Information-measuring control system of active vibration protection RED

Cited by 8 publications

References 5 publications

Models of Printed Circuit Boards Conductive Pattern Defects

Models of Printed Circuit Boards Conductive Pattern Defects

Dynamic Research on Low-frequency Vibration Isolation Tables

Development and validation of a nonlinear dynamic model for tuned liquid multiple columns dampers

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