BrainMap

Mrs. Daniela Susan-Resiga

associate professor

Associate Professor - UNIVERSITATEA DE VEST TIMISOARA

Researcher | Teaching staff

Web of Science ResearcherID: O-1620-2018

Curriculum Vitae (17/01/2019)

Expertise & keywords

Seismic protection of engineering structures through dissipative braces of nano-micro magnetorheological fluid dampers Call name: Joint Applied Research Projects - PCCA 2013 - call
PN-II-PT-PCCA-2013-4-1656 2014 - 2017

Role in this project: Key expert

Coordinating institution: UNIVERSITATEA POLITEHNICA TIMIŞOARA

Project partners: UNIVERSITATEA POLITEHNICA TIMIŞOARA (RO); ROSEAL S.A. (RO); INSTITUTUL DE MECANICA SOLIDELOR (RO); ACADEMIA ROMANA FILIALA TIMISOARA (RO); TITAN ECHIPAMENTE NUCLEARE SA (RO)

Affiliation: UNIVERSITATEA POLITEHNICA TIMIŞOARA (RO)

Project website: http://www.ct.upt.ro/centre/cemsig/semnal-mrd.htm

Abstract:

There are three strategies that can be used for seismic protection of structures: 1) reduce seismic demands; 2) enhance structural damping and 3) use active or semi-active structural control. Present project is framed in the third strategy focusing on semi-active systems. A semi-active device has properties that can be adjusted in real time but cannot inject energy into the controlled system. Many of them can operate on battery power alone, proving advantageous during seismic events when the main power source to the structure may fail. One of the most promising devices suitable for implementation into a semi-active control appears to be magneto-rheological (MR) dampers, which succeed in overcoming many of the expenses and technical difficulties associated with other types of semi-active devices. Response characteristics of magneto-rheological devices can be changed by varying the magnetic field through different current inputs. In addition to its small power requirement, the MR damper can generate large forces at low velocities. Currently there are MR dampers with capacities up to 200 kN and research results proved the possibility to obtain capacities up to 400-500 kN.

Present project intends to apply the nano-micro composite magnetizable fluids (MRF), whose properties may be tailored for the use in semi-active MR devices, with expectation to obtain appropriate and easy controllable performance for seismic protection applications, characterized by random low frequency motions of significant amplitudes. Previous experience (patents) of partners in the project consortium on using this technology to produce high pressure rotating seals already exists and offers a good starting base for present application. The possibility of fine tuning of the magneto-rheological response is a highly attractive feature of the nano-micro composite MR fluids, and that will be fully investigated and exploited. The MR response is dependent on the mean size and volume fraction of multi-domain ferromagnetic particles, but also on the volume fraction (saturation magnetization) of the magnetic nano-fluid carrier. The parameters of composition ensure manifold controlling mechanisms of the MR behavior of the nano-micro MR fluids and their fine tuning to the requirements of the envisaged MR damping devices for seismic protection of structures under different seismic motion characteristics. One MR damper of low capacity will be designed, fabricated and tested under different loading conditions (triangular, sinusoidal and random excitations). Numerical hysteretic models will be calibrated on the tested MR damper enabling modeling of structural response. Since the dampers in structural systems will be installed coupled with braces, both single damper and brace-damper assembly tests will be performed. With a numerically simulated control unit, structural systems equipped with brace-damper assemblies will be numerically tested in order to observe and characterize their behavior. The main outcomes of the project are: 1.Micro-nano composite MR fluid recipes for seismic semi-active dampers ; 2.Technical solutions for MR dampers; 3. A 10t MR damper prototipe; 4.Validation tests of brace-damper systems; 5.Numerical evaluation of effectiveness of MR dampers in reducing seismic effects in structural applications. Some of these results ((1) and (2)) might be patented. Moreover, the project will develop and provide an implementation plan, with the further research needs and technological developments aiming at implement in the current fabrication the MR nano-fluid dampers by the industrial partners. A consortium composed by two research centers of PU Timisoara, two research institutions of Romanian Academy, experienced in seismic engineering, complex ferro-fluid applications and structural control, and two industrial partners, with experience and capabilities for fabrication of MR fluids and dampers will be able to achieve the objectives of the project.

High magnetization magnetic nanofluids and nano-micro composite magnetizable fluids: applications in high pressure and heavy duty rotating seals and magnetorheological controller device Call name: Joint Applied Research Projects - PCCA-2011 call, Type 2
PN-II-PT-PCCA-2011-3.2-0538 2012 - 2016

Role in this project: Key expert

Coordinating institution: ACADEMIA ROMANA FILIALA TIMISOARA

Project partners: ACADEMIA ROMANA FILIALA TIMISOARA (RO); UNIVERSITATEA POLITEHNICA TIMIŞOARA (RO); ROSEAL S.A. (RO); INSTITUTUL NATIONAL DE CERCETARE-DEZVOLTARE PENTRU INGINERIE ELECTRICA ICPE - CA BUCURESTI (RO)

Affiliation: ACADEMIA ROMANA FILIALA TIMISOARA (RO)

Project website: http://acad-tim.tm.edu.ro/magnanomicroseal/

Abstract:

To reach the overall goal of developing and scaling-up nanotechnology based magnetofluidic lab-scale methods as innovative micropilot scale technologies, the MagNanoMicroSeal project consortium brings together the high level scientific and technological expertise, skills and know-how of four research groups from two research institutes and a technical university, as well as from a medium sized entreprise partner. A multidisciplinary approach will be dedicated to develop new magnetically controllable fluids, as well as leakage-free rotating seal and adaptive motion controlling devices for electronuclear and hydraulic power units. The workflow is organized along the following main directions: lab-scale and micropilot scale synthesis of high magnetization and radiation resistant magnetic nanofluids and nano-micro composite fluids for heavy duty (high pressure and /or rotation speed, contaminated medium) rotating seal and semi-active magnetorheological motion control applications; advanced structural, magnetic, rheological, magnetorheological characterization of the new magnetizable fluids; accelerated (irradiation) ageing and sealing capacity tests; design, manufacturing and experimental testing of leakage-free rotating seals for nuclear equipments and magnetorheological rotation speed controller devices for hydraulic turbomachines. The strong link to market needs is assured through the midsize company ROSEAL SA participating with major contributions in the project. The new rotating seal and motion control systems for nuclear and hydraulic equipments offer better quality than usual solutions have, will help to gain new market shares and open technological advantages over traditional manufacturing routes. The seal systems proposed for nuclear equipments offer much higher level of environmental protection over traditional sealing units due to the leakage- free property of magnetic fluid rotating seals, increasing the commercial value of the solutions proposed.

FILE DESCRIPTION	DOCUMENT
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