Applied Mechanics and Materials Vol. 9

Abstract: Up to now a coherence between pain and technical systems has almost not been researched. Whereas some aspects of the nociceptive pain which serves human beings as a warning system and is also described as useful, can be transferred necessarily to technical systems. The idea of pain detection is an additional product of the Mesoscopic Particle Method [2-4]. Thereby the transformation of kinetic energy into heat energy caused by impact- and friction processes in the boundary layer of contact areas is described correctly with respect to thermodynamics. Between the properties of pain and heat there obviously exist analogies. Pain increases when certain external effects get higher and decreases smoothly, when the effect is taken off [5]. Generally pain is a vector of different phenomena. By means of the developed sensor concept the application of energy is detected including implicit frequency selective information about the jerk. It will experimentally and numerically be shown how e. g. a “hard-soft-detection” of surfaces can be evaluated by the developed sensor concept.

Abstract: This paper is a brief review of the axial transmission measurements methodology. Theoretical background and description of the methodology is presented. Simulations made to verify some of the statements found in the scientific literature about the subject matter are described. Simulation performed were meant to be a basis for specifying parameters of the experimental set up to be used in the future. Three dimensional finite difference code was used to simulate wave propagation in human radius. Two models have been prepared to compare the results. One was an idealized geometry of the diaphysis of human radius and second was a reconstructed anatomical geometry from scans acquired with Computed Tomography (CT). Conclusions about the wave propagation character and feasibility of low frequency measurements in medical diagnostics are discussed.

Abstract: The paper presents problems of modal testing of large civil engineering objects like bridges or viaducts. Authors placed here the practical information, which need to be taken into account while planning and performing this type of measurements. Descriptions of 3 modal experiments with their results are shown. All measurements and analysis were performed for the structural health monitoring and damage assessment purposes. Particularly interesting is the third case, where authors tried to assess a damage level in the road viaduct without undamaged structure model.

Abstract: Arbitrary Lagrangian Eulerian (ALE) methods provide a well established basis for the numerical analysis of rolling contact problems, the theoretical framework is well developed for elastic constitutive behavior. Special measures are necessary for the treatment of history dependent and explicitly time dependent material behavior within the relative–kinematic ALE– picture. In this presentation a fractional step approach is suggested for the integration of the evolution equation for internal variables. A Time–Discontinuous Galerkin (TDG) method is introduced for the numerical solution of the related advection equations. The advantage of TDG–methods in comparison with more traditional integration schemes is studied in detail. The practicability of the approach is demonstrated by the finite element analysis of rolling tires.