Rami Faraj, M.Sc., Eng.

Department of Intelligent Technologies (ZTI)
position: doctoral student
telephone: (+48) 22 826 12 81 ext.: 432
room: 440
e-mail: rfaraj

Recent publications
1.Faraj R., Holnicki-Szulc J., Knap L., Seńko J., Adaptive inertial shock-absorber, SMART MATERIALS AND STRUCTURES, ISSN: 0964-1726, DOI: 10.1088/0964-1726/25/3/035031, Vol.25, pp.035031-1-9, 2016
Abstract:

This paper introduces and discusses a new concept of impact absorption by means of impact energy management and storage in dedicated rotating inertial discs. The effectiveness of the concept is demonstrated in a selected case-study involving spinning management, a recently developed novel impact-absorber. A specific control technique performed on this device is demonstrated to be the main source of significant improvement in the overall efficiency of impact damping process. The influence of various parameters on the performance of the shock-absorber is investigated. Design and manufacturing challenges and directions of further research are formulated.

Keywords:

adaptive impact absorption, adaptive inerter, semi-active control, shock-absorber

Affiliations:
Faraj R.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
Knap L.-Warsaw University of Technology (PL)
Seńko J.-Warsaw University of Technology (PL)

Conference papers
1.Faraj R., Popławski B., Suwała G., Jankowski Ł., Holnicki-Szulc J., Mitigation of dynamic response in frame structures by means of smart joints, SMART 2017, 8th Conference on Smart Structures and Materials, 2017-06-05/06-08, Madrid (ES), pp.138-144, 2017
Abstract:

This paper discusses passive and semi-active techniques of structural control by means of smart joints, and then it proposes a specific smart joints system for frame structures and tests its capability in mitigation of free vibrations. Basically, the proposed solution modifies frame beams by addition of truss-type hinges, and its effectiveness relies on the softening effect that occurs in compression due to geometric nonlinearities and which triggers the highly-damped high-frequency response modes of the structure. First, the finite element (FE) model of the specific frame structure with geometrical nonlinearities is derived, and the proposed passive joints are described and incorporated into the model. Then, their principle of operation and effectiveness is examined numerically for the first two natural modes of vibrations with various initial displacement amplitudes. An objective function is proposed to assess joints placement, based on the efficiency in mitigation of the excited vibrations.

Keywords:

Vibration Damping, Structure Response, Smart Structure, Structural Control

Affiliations:
Faraj R.-IPPT PAN
Popławski B.-IPPT PAN
Suwała G.-IPPT PAN
Jankowski Ł.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
2.Jankowski Ł., Graczykowski C., Pawłowski P., Mikułowski G., Ostrowski M., Popławski B., Faraj R., Suwała G., Holnicki-Szulc J., Adaptive Self-Protection against Shock and Vibration, Advances in Science and Technology, ISSN: 1662-0356, DOI: 10.4028/www.scientific.net/AST.101.133, Vol.101, pp.133-142, 2017
Abstract:

This contribution reviews the challenges in adaptive self-protection of structures. A proper semi-active control strategy can significantly increase structural ability to absorb impact-type loads and damp the resulting vibrations. Discussed systems constitute a new class of smart structures capable of a real-time identification of loads and vibration patterns, followed by a low-cost optimum absorption of the energy by structural adaptation. Given the always surging quest for safety, such systems have a great potential for practical applications (in landing gears, road barriers, space structures, etc.). Compared to passive systems, their better performance can be attributed to the paradigm of self-adaptivity, which is ubiquitous in nature, but still sparsely applied in structural engineering. Being in the early stages of development, their ultimate success depends on a concerted effort in facing a number of challenges. This contribution discusses some of the important problems, including these of a conceptual, technological, methodological and software engineering nature.

Keywords:

adaptive impact absorption, smart structures, semi-active control, safety engineering

Affiliations:
Jankowski Ł.-IPPT PAN
Graczykowski C.-IPPT PAN
Pawłowski P.-IPPT PAN
Mikułowski G.-IPPT PAN
Ostrowski M.-IPPT PAN
Popławski B.-IPPT PAN
Faraj R.-IPPT PAN
Suwała G.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN

Conference abstracts
1.Faraj R., Graczykowski C., Holnicki-Szulc J., Investigations on adaptable and adaptive impact absorption, ICAST2017, The 28th International Conference on Adaptive Structures and Technologies, 2017-10-08/10-11, Kraków (PL), pp.1, 2017
2.Faraj R., Graczykowski C., Holnicki-Szulc J., Knap L., Seńko J., Adaptable pneumatic shock-absorber, SMART 2017, 8th Conference on Smart Structures and Materials, 2017-06-05/06-08, Madrid (ES), pp.1, 2017
3.Faraj R., Holnicki-Szulc J., Knap L., Seńko J., Mitigation of the structure response based on inertial shock-absorber, EACS2016, 6th European Conference on Structural Control, 2016-07-11/07-13, Sheffield (GB), pp.1, 2016
Abstract:

The goal of this paper is to present further development of the inertial shock-absorber called SPINMAN. Application of the device in mitigation of structures response is investigated and selected case study is discussed. The specific construction and operation of the device is introduced and explained. In reference to the impact absorption problems, the SPIN-MAN is a concept of adaptive inerter device with two phases of operation. The first of them includes energy absorption and accumulation. External energy of the load is converted to kinetic energy of rotational motion of the mass. During the second phase, accumulated energy is dissipated by inverse spinning of the second mass powered by the remaining part of the impact energy. To obtain this type of operation, special switchable actuators are used. Applicability of the device in mitigation of impact-born structure response, especially in case of space systems, is investigated. General concept of the device construction and operation is adjusted to meet the requirements for space systems. This results in a fluidless, passive-like solution but adaptable to the load conditions. Tuning of the shock-absorber may be realized by manual or easily automated mechanical adjustments. Effectiveness of the solution is based on the specific on/off type of control, which is responsible for the optimal energy flow in the system and efficient dissipation of impact energy inside the SPIN-MAN. Results of numerical simulations confirmed quick and effective operation of this device.

Keywords:

structure response mitigation, adaptive impact absorption, adaptive inerter, semi-active control, shock-absorber

Affiliations:
Faraj R.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
Knap L.-Warsaw University of Technology (PL)
Seńko J.-Warsaw University of Technology (PL)
4.Faraj R., Holnicki-Szulc J., Adaptive inertial shock-absorber for vibration damping, ICoEV-2015, ICoEV 2015 : IFTOMM International Conference on Engineering Vibration 2015, 2015-09-07/09-10, Ljubljana (SI), pp.1, 2015
Keywords:

Adaptive Impact Absorption, shock-absorber, vibration damping

Affiliations:
Faraj R.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
5.Holnicki-Szulc J., Faraj R., Graczykowski C., Jankowski Ł., Mikułowski G., Mróz A., Ostrowski M., Pawłowski P., Wiszowaty R., Adaptive impact absorption - potential applications for safety engineering, SMART 2015, 7th ECCOMAS Thematic Conference on Smart Structures and Materials, 2015-06-03/06-05, Ponta Delgada (PT), pp.1-2, 2015
Keywords:

Smart And Adaptive Structures, Adaptive Impact Absorption, Safety Engineering

Affiliations:
Holnicki-Szulc J.-IPPT PAN
Faraj R.-IPPT PAN
Graczykowski C.-IPPT PAN
Jankowski Ł.-IPPT PAN
Mikułowski G.-IPPT PAN
Mróz A.-IPPT PAN
Ostrowski M.-IPPT PAN
Pawłowski P.-IPPT PAN
Wiszowaty R.-IPPT PAN

Patents
Numer/data zgłoszenia patentowego
Ogłoszenie o zgłoszeniu patentowym
Twórca / twórcy
Tytuł
Kraj i Nazwa uprawnionego z patentu
Numer patentu
Ogłoszenie o udzieleniu patentu
pdf
420831
2017-03-13
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Faraj R., Wołejsza Z.
Konstrukcja mechanizmu do pre-rotacji wirnika nośnego oraz sposób wprawiania wirnika nośnego w stan wstępnej rotacji z zastosowaniem mechanizmu z kołem zamachowym, zwłaszcza do kapsuł zrzutowych
PL, Instytut Podstawowych Problemów Techniki PAN
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419786
2016-12-13
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Holnicki-Szulc J., Faraj R., Pawłowski P., Wołejsza Z., Kaźmierczak K., Hinc K.
Rozkładana konstrukcja sterowca stratosferycznego i sposób zmiany objętości, zwłaszcza rozkładanej konstrukcji sterowca stratosferycznego
PL, Instytut Podstawowych Problemów Techniki PAN, Adaptronica Sp. z o.o.
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666285
2016-10-28
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Faraj R., Graczykowski C., Holnicki-Szulc J.
Absorber pneumatyczny o adaptowalnej charakterystyce odpowiedzi, wypełniony powietrzem atmosferycznym, zwłaszcza do łagodzenia przyziemienia zrzucanych ładunków
PL, Instytut Podstawowych Problemów Techniki PAN, Adaptronica Sp. z o.o.
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415131
2015-12-04
BUP 12/2017
2017-06-05
Holnicki-Szulc J., Knap L., Faraj R., Seńko J.
Amortyzator śrubowy z krótkimi łopatkami i amortyzator śrubowy z długimi łopatkami
PL, Instytut Podstawowych Problemów Techniki PAN, Adaptronica Sp. z o.o.
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414970
2015-11-26
BUP 12/2017
2017-06-05
Holnicki-Szulc J., Knap L., Faraj R., Seńko J.
Amortyzator śrubowo-rotacyjny z jednym wejściem i amortyzator śrubowo-rotacyjny z dwoma wejściami
PL, Instytut Podstawowych Problemów Techniki PAN, Adaptronica Sp. z o.o.
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414367
2015-10-14
BUP 9/2017
2017-04-24
Holnicki-Szulc J., Knap L., Seńko J., Faraj R.
Urządzenie do tłumienia udaru i sposób tłumienia udaru
PL, Instytut Podstawowych Problemów techniki PAN, Adaptronica Sp z o.o.
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411237
2015-02-11
BUP 17/2016
2016-08-16
Holnicki-Szulc J., Mróz A., Faraj R.
Sposób tłumienia drgań wywołanych udarem mechanicznym, oraz tłumik bezwładnościowy
PL, Instytut Podstawowych Problemów techniki PAN, Adaptronica Sp z o.o.
227058
WUP 10/2017
2017-10-31
410275
2014-11-27
BUP 12/16
2016-06-06
Holnicki-Szulc J., Faraj R., Mróz A.
Opakowanie amortyzujące uderzenia
PL, Instytut Podstawowych Problemów Techniki PAN, Adaptronica Sp. z o.o.
225398
WUP 04/17
2016-10-21
409600
2014-09-25
BUP 7/2016
2016-03-29
Holnicki-Szulc J., Mróz A., Faraj R.
Lądownik do bezpiecznych zrzutów z powietrza
PL, Instytut Podstawowych Problemów Techniki PAN, Adaptronica Sp. z o.o.
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