BrainMap

Mr. Silviu-Marian Nastac

Prof.Dr.Eng.Hab.

Professor - UNIVERSITATEA "DUNAREA DE JOS"

Other affiliations

Researcher - INSTITUTULUI DE CERCETARI PENTRU ECHIPAMENTE SI TEHNOLOGII IN CONSTRUCTII – ICECON S.A. (Romania)

Associate Professor, Researcher - UNIVERSITATEA TRANSILVANIA BRASOV (Romania)

Researcher | Teaching staff | Scientific reviewer | PhD supervisor

Web of Science ResearcherID: https://publons.com/researcher/2844683/silviu-nastac/

Expertise & keywords

Qualitative, dynamic and acoustic analysis of anisotropic systems with modified interfaces Call name: P 4 - Proiecte de cercetare exploratorie - PCE-2021
PN-III-P4-PCE-2021-0885 2022 - 2024

Role in this project:

Coordinating institution: UNIVERSITATEA TRANSILVANIA BRASOV

Project partners: UNIVERSITATEA TRANSILVANIA BRASOV (RO)

Affiliation:

Project website: https://acadia.unitbv.ro

Abstract:

The project "Qualitative, dynamic and acoustic analysis of anisotropic systems with modified interfaces ACADIA", with the current violin and heritage violin cases, aims the exploration of mechanical, dynamic and acoustic properties of wood in the construction of stringed musical instruments, both anisotropic systems with structures and different interfaces due to the texture and design of the wood, as well as multi-body systems whose complex geometry give the musical instrument its special acoustic qualities. The novelty of the project consists in the frontier and interdisciplinary research of resonant wood whose structural characteristics have been influenced by climate change in the last 50 years compared to assortments of aged wood (naturally aged), as well as wood treated by surface treatments and dynamics in concordance with the recipes of the old violin makers (Stradivari/Amati/Guarnieri). The operational objectives of the project will be materialized through application experimental investigations, with high-tech equipment and through an interdisciplinary research team in the field of earth sciences (forest), chemistry and materials science, engineering sciences, humanities (music), ensuring the transfer of knowledge from experienced researchers to young researchers. The added value of the project is the reaffirmation of Romanian research in a niche field (production of musical instruments) in which over 90% is export.

INNOVATIVE AND SUSTAINABLE STRATEGIES TO OBTAIN HEMICELLULOSES BASED COATINGS WITH APPROPRIATE PROPERTIES TO DEVELOP ACTIVE AGRO-FOOD PACKAGING PAPER Call name: P 4 - Proiecte de cercetare exploratorie - PCE-2021
PN-III-P4-PCE-2021-0714 2022 - 2024

Role in this project:

Coordinating institution: UNIVERSITATEA "DUNAREA DE JOS"

Project partners: UNIVERSITATEA "DUNAREA DE JOS" (RO)

Affiliation:

Project website: https://susthc-coatpack.ugal.ro/

Abstract:

SustHC_CoatPack proposal is aiming to develop the innovative strategies to obtain new functional coatings based on hemicellulose polysaccharides which will be applied by wet lamination on paper/board surface to improve their performances according to requirements of agro foods packaging. Two innovative strategies to obtain a sustainable paper packaging which can compete with plastic market references and perfectly integrated in the paper and cardboard waste value chain, are proposed: (i) Developing of biopolymer coatings with barrier properties for fatty food packaging paper: this strategy is based on obtaining of tailored xylan hemicelluloses (XyHCs) derivatives by esterification reactions using ionic liquids (ILs) which will be used as single polymer or as polyelectrolyte complexes by ionic interactions with cationic/amphoteric/amphyphylic biopolymers (e.g. chitosan or starch) in multilayer coatings on paper surface in order to obtain optimum barrier properties (water, water vapour, oxygen and oil and grease) and (ii) Design of biopolymer composite coatings based on the incorporation of active/functional additives (i.e. plant extracts and mineral oxides: ZnO, CuO nanoparticles ) for fresh vegetables paper packaging, with the aim to improve specific properties of coated paper and/or create active antimicrobial functionalities which request an equilibrium barrier (adsorption/desorption of humidity).

Models of innovative violins acoustically and aesthetically comparable to heritage violins Call name: P 2 - SP 2.1 - Proiect experimental - demonstrativ
PN-III-P2-2.1-PED-2019-2148 2020 - 2022

Role in this project:

Coordinating institution: UNIVERSITATEA TRANSILVANIA BRASOV

Project partners: UNIVERSITATEA TRANSILVANIA BRASOV (RO); INSTITUTUL NATIONAL DE CERCETARE-DEZVOLTARE PENTRU FIZICA TEHNICA-IFT IASI (RO); GLIGA INSTRUMENTE MUZICALE SA (RO)

Affiliation: UNIVERSITATEA TRANSILVANIA BRASOV (RO)

Project website: https://minovis.unitbv.ro/

Abstract:

The project “Models of innovative violins acoustically and aesthetically comparable to heritage violins - MINOVIS '' aims to demonstrate the acoustical, aesthetical and technological quality of violins with modified geometrical and structural parameters considered to be innovative models, by increasing interaction and synergy between different disciplines.

The demonstrative model is an innovative product that consists in changing the thickness of the top and back plates of the violins, in correlation with the structural characteristics of the wood, bringing, in addition to the current models, modulation of the violin tone to a performance level similar to that of heritage violins. At least 60 finished violins, belonging to the four quality classes (maestro, professional, student and school) will be manufactured, analyzed, tested and validated, in comparison to at least 4 heritage violins that will be investigated by the same methods. Moreover, the innovative models will further demonstrate, at international level, the quality of the Romanian violins through all what they represent as cultural identity - the raw material, the craftsmanship and the artistry of the Romanian carpenters, product research and innovation.

The implementation of the project and the achievement of the objectives will be reached both through the experimental stand developed for capturing the modal parameters (eigenfrequencies, natural modes, frequency spectrum, damping factor) and acoustic parameters (sound spectrum - harmonics, acoustic intensity), as well as through opinion polls among performers (violin players) regarding the quality of the demonstrative violins from a psycho-acoustic point of view. the novelty of the project compared to the numerous studies in reference literature consists in demonstrating the acoustic quality of the violin models made by Romanian manufacturers from Romanian resonance wood, with Romanian craftsmanship and Romanian technical culture-all preserved in Reghin.

Mixed damping support group, in modular design, to dynamically insulate the bridges and viaducts for seismic actions Call name: Joint Applied Research Projects - PCCA 2013 - call
PN-II-PT-PCCA-2013-4-0392 2014 - 2017

Role in this project:

Coordinating institution: INSTITUTULUI DE CERCETARI PENTRU ECHIPAMENTE SI TEHNOLOGII IN CONSTRUCTII – ICECON S.A.

Project partners: INSTITUTULUI DE CERCETARI PENTRU ECHIPAMENTE SI TEHNOLOGII IN CONSTRUCTII – ICECON S.A. (RO); UNIVERSITATEA TEHNICA DE CONSTRUCTII BUCURESTI (RO); CENTRUL DE CERCETARE - INCERCON S.R.L. (RO); CITCON NOVA S.R.L. (RO); SOCIETATE PENTRU REABILITAREA ECHIPAMENTELOR SI CONSTRUCTIILOR - SORECON S.R.L. (RO)

Affiliation: CITCON NOVA S.R.L. (RO)

Project website: http://icecon.ro/Proiecte Nationale/Programul Parteneriate/Contract 235/2014/detalii

Abstract:

This project includes an innovative solution of a mixed damping support group, in modular design, to dynamically insulate the bridges and viaducts for seismic actions, which is to fulfil the functions of the insulation devices currently in use and, in addition, it should have the following characteristics:

- dampens all six components of the bridge superstructure movement arising from the seismic action (three translations and three rotations);

- achieves the optimal damping;

- allows the superstructure rebound after the end of the seismic action.

The support and anti-seismic insulation group will be formed of:

1. HDRB or LRB elastomeric isolator;

2. FPS friction isolator or spherical bearing;

3. system consisting of six hydraulic dampers, arranged in a geometrical configuration, according to the Stewart platforms kinematic schemes;

4. connecting elements.

All the component elements of the group having insulation and damping role are stand-alone products, under the current production of companies with experience and expertize in the field, with individual features, regularly used and checked in the dynamic insulation practice of viaducts and bridges.

According to this project, the support and anti-seismic insulation group, can be achieved in two embodiments, each version representing a systemic product in terms of concept, constructiveness and functionality.

In the first embodiment, “series group”, the friction shperical/isolator damper is assembled in parallel with the hidraulic damper system, arranged in Stewart configuration and such subassembly is mounted in series with the elastomeric device HDRB/LRB. In the second embodiment, “parallel group”, the friction shperical/isolator damper, is assembled in series with the elastomeric device HDRB/LRB forming a subassembly, which in its turn is mounted in parallel with the hidraulic damper system, arranged in Stewart configuration.

The optimal damping for the support and anti-seismic insulation group will be achieved by the interlocking of the three types of devices in its componence, by combining the three types of dampings specific to each device and alos by weighting the dampings specific to each device in the group’s total damping.

Project objectives are as follows:

a) Obtaining a support group with dynamic insulation performances and combined dissipative effect through the individual or simultaneous effect of the dry friction mechanism, the viscoelastic or viscous effect, intended for anti-seismic insulation of bridges and viaducts, at experimental model level.

b) Underlying and developing a mathematical model for these types of support groups and anti-seismic insulation.

c) Designing constructive and innovative embodiments, with defined and measurable performance so as to be compatible with the types of bridges and viaducts, located in recognized seismic zones.

d) Exploitation of the results of the research carried out through a dynamic analysis model on the viaduct-support group interlocking, under the conditions of dynamic actions generated by seismic shocks and loads.

Project outcomes will be as follows: mixed damping support group, in modular design, to dynamically insulate the bridges and viaducts for seismic actions, at experimental model level; mathematical model for dynamic actions related behaviour of the mixed damping support group; dynamic study on the viaduct assembly-support group interlocking, under the conditions of dynamic actions generated by seismic shocks and loads.

FILE DESCRIPTION	DOCUMENT
List of research grants as project coordinator
List of research grants as partner team leader
List of research grants as project coordinator or partner team leader
Significant R&D projects for enterprises, as project manager
R&D activities in enterprises
Peer-review activity for international programs/projects