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1
Content available remote Preliminary research of a symmetrical controllable granular damper prototype
Mackojc Anna, Chilinski Bogumil, Zalewski Robert
Bulletin of the Polish Academy of Sciences. Technical Sciences
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2022
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Vol. 70, nr 3
art. no. e141002
EN
This paper concerns the problem of empirical investigation and mathematical modelling of a novel controllable damper using Vacuum Packed Particles. Vacuum Packed Particles tend to be placed among the group of so-called ‘smart structures’. The macroscopic mechanical features of such structures can be controlled by the partial vacuum parameter. The authors consider an application of Bouc-Wen model in order to represent the dynamic behaviour of the investigated device. The verification of the model response with experimental data is discussed. The Bouc-Wen model parameters identification is described.
2
Content available Possibilities of vacuum packed particles application in blast mitigation seats in military armored vehicles
Rodak Dominik, Żurawski Mateusz, Gmitrzuk Michał, Starczewski Lech
Bulletin of the Polish Academy of Sciences. Technical Sciences
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2022
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Vol. 70, nr 1
art. no. e138238
EN
Blast mitigation continues to be a popular field of research when military vehicles are concerned. The main problem is coping with the vehicle global motion consequences following an explosion. The paper presents a potential application of the linear vacuum packed particle (VPP) damper as a supplementation for a viscous shock absorber in a traditional blast mitigation seat design. The paper also presents field test results for the underbelly blast explosion, comparing them to the laboratory tests carried out on the impact bench. To collect accelerations, the anthropomorphic test device, i.e. the Hybrid III dummy, was used. A set of numerical simulations of the modified blast mitigation seat with the additional VPP linear damper were revealed. The VPP damper was modeled according to the Johnson–Cook model of viscoplasticity. The Hertzian contact theory was adopted to model the contact between the vehicle and the ground. The reduction of the dynamic response index (DRI) in the case of the VPP damper application was also proved.
3
Content available Preliminary study of the Vacuum Packed Particles torsional damper
Zalewski Robert, Rodak Dominik
Journal of Theoretical and Applied Mechanics
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2021
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Vol. 59 nr 1
173--178
EN
The paper presents a prototype of an innovatory controllable torsional damper. The device is composed of Vacuum Packed Particles. Such structures are made of granular materials placed in a hermetic soft encapsulation. Generating so called underpressure inside the system changes global dissipative properties of the granular structure. The partial vacuum value is a convenient way to control physical properties of the granular structure. The authors introduce an original prototype of a torsional vibration attenuator. In the experimental part, preliminary experimental results are presented and discussed. To capture the real response of the device, a Bouc-Wen rheological model is adopted.
4
Content available remote Parameter identification of Bouc-Wen model for vacuum packed particles based on genetic algorithm
Bartkowski Piotr, Zalewski Robert, Chodkiewicz Paweł
Archives of Civil and Mechanical Engineering
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2019
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Vol. 19, no. 2
322--333
EN
This paper investigates cylindrical samples made of vacuum packed particles. Such structures are composed of granular media placed in a hermetic encapsulation where, in the final stage, a partial vacuum is generated. The main advantage of such a structure is that the underpressure value makes it possible to control the global physical properties of granular systems. Materials with various grains are analyzed in the paper. A modified Bouc-Wen hysteresis model is adopted to describe the nonlinear properties of the tested specimens. To identify the model parameters, a genetic algorithm is applied. The proposed model is found to be in good agreement with the experimental data.
5
Content available The use of Vacuum Packed Particles with adaptable properties in acoustic applications
Zalewski R., Rutkowski M.
Journal of Theoretical and Applied Mechanics
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2018
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Vol. 56 nr 2
403--416
EN
The aim of this paper is to present possibilities of using a new type of granular media in acoustics as innovative sound absorbers. Most materials of this type have a porous or fibrous structure. It is constant, and once manufactured, does not easily change its configuration. The examined material – Vacuum Packed Particles (VPP) is of a changeable structure. It can be assumed that the acoustical absorption of such structures can be modified and partially adjusted by an external factor. First steps in an experimental approach have been made – the acquired results are optimistic. Additional tests are being planned to confirm the observed phenomenon and to apply VPP as novel materials in acoustics. Basing on the preliminary experimental tests, it can be concluded that the considered structures could become a significant part of a multilayered structure which would have controllable sound absorption properties.
6
Content available Semi-active linear vacuum packed particles damper
Zalewski R., Chodkiewicz P.
Journal of Theoretical and Applied Mechanics
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2016
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Vol. 54 nr 1
311--316
EN
In this paper, the authors focus on the proposition of an innovative semi-active linear damper prototype working on the basis of granular materials. Vacuum Packed Particles (VPP) belong to the class of materials whose mechanical (rheological, dissipative) properties may be quickly changed by applying a partial vacuum inside the system. The concept of an innovative linear damper based on VPP is presented in the paper. Typical experimental results are presented to reveal changeable damping characteristics of the device. Additionally, the mathematical model is proposed to capture extraordinary features of the investigated damper.
7
Content available remote Calibration of the Bodner-Partom Constitutive Model for Vacuum Packed Particles Using Simulated Annealing Algorithm
Zalewski R., Pyrz M., Chodkiewicz P.
Machine Dynamics Research
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2015
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Vol. 39, No. 3
93-101
EN
The work is related to the numerical modeling of Vacuum Packed Particles (VPP)-structures composed of grains enclosed in an elastic envelope and submitted to internal underpressure. The behavior of the material is modeled using viscoplastic law of Bodner-Partom. The inverse problem of constitutive model parameter identification is solved using the non deterministic optimization procedure based on simulated annealing algorithm. The results of numerical simulation are compared with experimental results.
8
Content available Vibration analysis for vehicle with vacuum packed particles suspension
Makowski M., Zalewski R.
Journal of Theoretical and Applied Mechanics
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2015
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Vol. 53 nr 1
109--117
EN
The paper concerns an effect of the damping force controlling a vehicle suspension system. The investigated vehicle suspension system consists of innovatory Vacuum Packed Particles controllable dampers which allow controlling the vehicle body vibration. The main objective of performed and presented in the paper studies is to determine properties of the Vacuum Packed Particles (VPP) damper and propose a preliminary control strategy. The control in the vehicle suspension system can be realized by controlling the underpressure resulting in various jamming mechanisms in the granular core. Some algorithms of vibration control are also proposed and discussed.
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