Results 41 to 50 of about 23,283 (202)
LAX TENSORS, KILLING TENSORS AND GEOMETRIC DUALITY [PDF]
, 1999 The solution of the Lax tensor equations in the case L-alpha beta gamma = -L-beta alpha gamma was analyzed. The Lax tensors on the dual metrics were investigated.
Karasu, A +3 more
core +2 more sources
Semi‐active ℋ∞ damping optimization by adaptive interpolation [PDF]
, 2020 In this work we consider the problem of semi‐active damping optimization of mechanical systems with fixed damper positions. Our goal is to compute a damping that is locally optimal with respect to the ℋ∞‐norm of the transfer function from the exogenous ...
Tomljanović, Zoran, Voigt, Matthias
core +1 more source
Karl Popper and the Mechanisms of Hydrogen Embrittlement
Advanced Engineering Materials, EarlyView.Representation of the beginning of loss of ductility rather than embrittlement. Small concentrations of hydrogen in a diffusible form within iron are well‐established to harm the mechanical integrity of steels. There are theories that attempt to explain the pernicious role of hydrogen.
H. K. D. H. Bhadeshia
wiley +1 more source
Smooth weight optimization in ℋ∞ loop-shaping design
, 2010 Smooth variation in the magnitude response of weights facilitates ℋ∞ loop-shaping design, as it prevents the cancellation of important modes of the system, for example, lightly damped poles/zeros of flexible structures, when the shaped plant is formed ...
Osinuga, M. +5 more
core +1 more source
Advanced Engineering Materials, EarlyView.Identified through the use of statistical design of experiments and metallographic investigation, this study exposes the stochastic origins of intergranular cracks in blown powder laser beam directed energy deposition additive manufacturing of pure molybdenum. It further demonstrates a successful crack mitigation approach with direct correlation to the
Nathaniel J. Lies +2 more
wiley +1 more source
ℋ-Matrix preconditioners in convection-dominated problems
, 2006 Hierarchical matrices provide a data-sparse way to approximate fully populated matrices. In this paper we exploit ℋ-matrix techniques to approximate the LU-decompositions of stiffness matrices as they appear in (finite element or finite difference ...
Grasedyck, Lars, Le Borne, Sabine
core
Stable ℋ∞ flow controller design using approximation of FIR filters
, 2010 Stable flow controllers are usually preferred since, compared with unstable flow controllers, they are less sensitive to any modelling imperfections. ℋ∞-optimal flow controllers involve finite impulse–response (FIR) filters due to the time delays which ...
Hakkι Ulaş Ünal, Altuğ İftar
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Advanced Engineering Materials, EarlyView.A two‐dimensional multiscale finite element analysis framework was established for the first‐generation MoSiBTiC alloy, and the mechanical and fracture‐related parameters of the constituent phases were calibrated through experiments and simulations. The framework provides a basis for analyzing crack propagation behavior in its complex microstructure ...
Junfeng Du +4 more
wiley +1 more source
Adaptive geometrically balanced clustering of ℋ-matrices
, 2004 In [8], a class of (data-sparse) hierarchical (ℋ-) matrices is introduced that can be used to efficiently assemble and store stiffness matrices arising in boundary element applications.
Grasedyck, Lars +2 more
core
Selection of a single uniquely specifiable ℋ∞ controller in the chain-scattering framework
, 2004 This paper studies the notion of central ℋ∞ controllers in the chain-scattering framework. Since in the chain-scattering framework the ℋ∞ control problem is equivalent to a factorisation problem that yields non-unique factors, it is important to somehow ...
Lanzon, Alexander +4 more
core +1 more source