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Hou J.♦, Xu D.♦, Jankowski Ł., Liu Y.♦, Constrained mode decomposition method for modal parameter identification,
STRUCTURAL CONTROL AND HEALTH MONITORING, ISSN: 1545-2255, DOI: 10.1002/stc.2878, Vol.29, No.2, pp.e2878-1-24, 2022Streszczenie: Many mode decomposition methods suffer from aliasing effects and modal distortion. This paper proposes a constrained mode decomposition (CMD) method that directly addresses these problems. The CMD is based on a linear combination of structural-free responses. The decomposed response is thus ensured to have a physical meaning and to satisfy the structural equation of motion, which improves the accuracy of mode decomposition and identification. The decomposition aim is to obtain a single-mode response. The CMD defines the corresponding natural frequency as the target frequency, while other natural frequencies are defined as constrained frequencies. The proposed method combines the measured physical responses in such a way that the constrained frequency components are selectively suppressed, while the amplitude of the target frequency component is selectively retained above a predefined level. The result is the intended single-mode free response, which can be used to clearly extract the corresponding modal parameters. For well-separated modes, the criterion for selective suppression is based on the fast Fourier transform (FFT) peak amplitude. For separation of closely spaced modes, a criterion based on FFT derivative is proposed to avoid modal distortion. The accuracy and applicability of the CMD method is tested in a numerical simulation and using a four-story lab frame structure. The experimental data are used to verify the effectiveness of the proposed CMD method and to compare it with two other widely used mode decomposition methods. Słowa kluczowe: frequency-domain response, linear combination, mode decomposition, peak characteristics, structural health monitoring (SHM) Afiliacje autorów:
Hou J. | - | Dalian University of Technology (CN) | Xu D. | - | Dalian University of Technology (CN) | Jankowski Ł. | - | IPPT PAN | Liu Y. | - | Forschugszentrum Jülich, Institute of Complex Systems (DE) |
| | 140p. |
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Liu Y.♦, Wang Q.♦, Liu X.♦, Nakielski P., Pierini F., Li X.♦, Yu J.♦, Ding B.♦, Highly adhesive, stretchable and breathable gelatin methacryloyl-based nanofibrous hydrogels for wound dressings,
ACS Applied Bio Materials, ISSN: 2576-6422, DOI: 10.1021/acsabm.1c01087, Vol.5, No.3, pp.1047-1056, 2022Streszczenie: Adhesive and stretchable nanofibrous hydrogels have attracted extensive attraction in wound dressings, especially for joint wound treatment. However, adhesive hydrogels tend to display poor stretchable behavior. It is still a significant challenge to integrate excellent adhesiveness and stretchability in a nanofibrous hydrogel. Herein, a highly adhesive, stretchable, and breathable nanofibrous hydrogel was developed via an in situ hybrid cross-linking strategy of electrospun nanofibers comprising dopamine (DA) and gelatin methacryloyl (GelMA). Benefiting from the balance of cohesion and adhesion based on photocross-linking of methacryloyl (MA) groups in GelMA and the chemical/physical reaction between GelMA and DA, the nanofibrous hydrogels exhibited tunable adhesive and mechanical properties through varying MA substitution degrees of GelMA. The optimized GelMA60-DA exhibited 2.0 times larger tensile strength (2.4 MPa) with an elongation of about 200%, 2.3 times greater adhesive strength (9.1 kPa) on porcine skin, and 3.1 times higher water vapor transmission rate (10.9 kg m–2 d–1) compared with gelatin nanofibrous hydrogels. In parallel, the GelMA60-DA nanofibrous hydrogels could facilitate cell growth and accelerate wound healing. This work presented a type of breathable nanofibrous hydrogels with excellent adhesive and stretchable capacities, showing great promise as wound dressings. Słowa kluczowe: nanofibrous hydrogels, hybrid cross-linking, adhesivity, stretchability, breathable capability Afiliacje autorów:
Liu Y. | - | Forschugszentrum Jülich, Institute of Complex Systems (DE) | Wang Q. | - | Donghua University (CN) | Liu X. | - | Imperial College London (GB) | Nakielski P. | - | IPPT PAN | Pierini F. | - | IPPT PAN | Li X. | - | Donghua University (CN) | Yu J. | - | Donghua University (CN) | Ding B. | - | Donghua University (CN) |
| | 20p. |
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Liu Y.♦, Bławzdziewicz J.♦, Cichocki B.♦, Dhont J.K.G.♦, Lisicki M.♦, Wajnryb E., Youngf Y.N.♦, Lang P.R.♦, Near-wall dynamics of concentrated hard-sphere suspensions: comparison of evanescent wave DLS experiments, virial approximation and simulations,
SOFT MATTER, ISSN: 1744-683X, DOI: 10.1039/c5sm01624j, Vol.11, pp.7316-7327, 2015Streszczenie: In this article we report on a study of the near-wall dynamics of suspended colloidal hard spheres over a broad range of volume fractions. We present a thorough comparison of experimental data with predictions based on a virial approximation and simulation results. We find that the virial approach describes the experimental data reasonably well up to a volume fraction of ϕ ≈ 0.25 which provides us with a fast and non-costly tool for the analysis and prediction of evanescent wave DLS data. Based on this we propose a new method to assess the near-wall self-diffusion at elevated density. Here, we qualitatively confirm earlier results [Michailidou, et al., Phys. Rev. Lett., 2009, 102, 068302], which indicate that many-particle hydrodynamic interactions are diminished by the presence of the wall at increasing volume fractions as compared to bulk dynamics. Beyond this finding we show that this diminishment is different for the particle motion normal and parallel to the wall. Afiliacje autorów:
Liu Y. | - | Forschugszentrum Jülich, Institute of Complex Systems (DE) | Bławzdziewicz J. | - | Texas Tech University (US) | Cichocki B. | - | Uniwersytet Warszawski (PL) | Dhont J.K.G. | - | Forschugszentrum Jülich, Institute of Complex Systems (DE) | Lisicki M. | - | inna afiliacja | Wajnryb E. | - | IPPT PAN | Youngf Y.N. | - | New Jersey Institute of Technology (US) | Lang P.R. | - | Forschugszentrum Jülich, Institute of Complex Systems (DE) |
| | 40p. |