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Modal identification of multi-degree-of-freedom structures based on intrinsic chirp component decomposition method
Springer Science and Business Media LLC - Tập 40 - Trang 1741-1758 - 2019
Modal parameter identification is a mature technology. However, there are some challenges in its practical applications such as the identification of vibration systems involving closely spaced modes and intensive noise contamination. This paper proposes a new time-frequency method based on intrinsic chirp component decomposition (ICCD) to address these issues. In this method, a redundant Fourier m......
Effective data sampling strategies and boundary condition constraints of physics-informed neural networks for identifying material properties in solid mechanics
Springer Science and Business Media LLC - Tập 44 - Trang 1039-1068 - 2023
Material identification is critical for understanding the relationship between mechanical properties and the associated mechanical functions. However, material identification is a challenging task, especially when the characteristic of the material is highly nonlinear in nature, as is common in biological tissue. In this work, we identify unknown material properties in continuum solid mechanics vi......
Restudy of coupled field theories for micropolar continua (II) — Thermopiezoelectricity and magnetothermoelasticity
Springer Science and Business Media LLC - Tập 23 - Trang 249-258 - 2002
The theories of thermopiezoelectricity and magnetoelasticity for micropolar continua have been systematically developed by W. Nowacki. In this paper, the theories are restudied. The reason why they were restricted to linear cases is analyzed. The more general conservation principle of energy, energy balance equation and Hamilton principle of thermopiezoelectricity and magnetoelasticity for micropo......
Robust design of natural laminar flow supercritical airfoil by multi-objective evolution method
Springer Science and Business Media LLC - Tập 35 - Trang 191-202 - 2014
A transonic, high Reynolds number natural laminar flow airfoil is designed and studied. The γ-θ transition model is combined with the shear stress transport (SST) k-w turbulence model to predict the transition region for a laminar-turbulent boundary layer. The non-uniform free-form deformation (NFFD) method based on the non-uniform rational B-spline (NURBS) basis function is introduced to the airf......
Investigation of tensile deformation behavior of PC, ABS, and PC/ABS blends from low to high strain rates
Springer Science and Business Media LLC - Tập 33 - Trang 455-464 - 2012
This paper experimentally studies the tensile deformation behavior of polycarbonate (PC), acrylonitrile-butadiene-styrene (ABS), and PC/ABS blends (with the blending ratios of PC to ABS being 80:20, 60:40, 50:50, and 40:60) from low to high strain rates. Using the universal MTS-810 machine and the split Hopkinson tension bar (SHTB) testing system, the quasi-static and impact tension tests are carr......
Concepts of mechanical parameters transfer in solid medium and its application in engineerings
Springer Science and Business Media LLC - Tập 25 - Trang 143-151 - 2004
Based on investigation into four aspects of qualitative mechanical analysis, principle model experiments, engineering dynamic load tests and numerical calculation, it was discussed that the transfer of stresses and accelerations in stratum medium have a close relation with its relative rigidity. The concepts of stresses and accelerations transfer in solid medium and its corresponding generalized, ......
The derivation of exact static conditions at the corner points for the bending of thick rectangular plates
Springer Science and Business Media LLC - Tập 15 - Trang 595-600 - 1994
In this paper, exact static conditions at the corner points for the bending of thick rectangular plates are strictly derived from the theorem of minimum potential energy.
Road to chaos for a soft spring system under weak periodic disturbance
Springer Science and Business Media LLC - Tập 7 - Trang 111-116 - 1986
The Mel'nikov-Holmes method is used to discuss the road to chaos for an elastic system with soft spring constant and under weak periodic disturbance. It is found that according to how the disturbance is applied, forced vibration or parametric excitation, the response may pass to chaos through different sequences of subharmonic bifurcations, and that the orders in the sequences may be different for......
Lane-Emden equations of second kind modelling thermal explosion in infinite cylinder and sphere
Springer Science and Business Media LLC - Tập 34 - Trang 1439-1452 - 2013
We study a modified version of the Lane-Emden equation of the second kind modelling a thermal explosion in an infinite cylinder and a sphere. We first show that the solution to the relevant boundary value problem is bounded and that the solutions are monotone decreasing. The upper bound, the value of the solution at zero, can be approximated analytically in terms of the physical parameters. We obt......
The global bifurcation structure of a kind of digit mapping
Springer Science and Business Media LLC - Tập 12 - Trang 201-209 - 1991
The global structure of the mapping Tn:x→[x
2]n is studied. The symmetric unconnected substructures of T2 is coincident with [1] by computer, but for n=3 the symmetry of these substructures vanishes. As n is increasing, the global bifurcation structure of Tn is shown. Finally, similar results for the mapping Tn, μ:x→[μx
2]n are also proved..
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