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An approach for the reproduction of friction induced vibrations in shift gearboxes in audible frequency range is presented. The research's core is given by follower forces, which arise out of the sliding clutch and gear contact. Firstly, a multi-body dynamic system with few degrees of freedom is presented, which is extended step-by-step. Besides the pure analysis of the stationary solution's stability, dynamic solutions are presented and discussed.

reibungserregte Schwingungen --- friction induced vibrations --- Antriebsstrang --- Vibrationsanalyse --- drivetrain --- vibration analysis

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Calculation of vibrational frequencies. --- Diatomic molecules. --- Electronic spectra. --- Electronic spectroscopy. --- Group theory. --- Linear molecules. --- Molecular spectroscopy. --- Molecular symmetry. --- Polyatomic molecules. --- Quantum mechanics. --- Rotation-vibration spectra. --- Rotational energies. --- Vibration analysis. --- Vibrational energies.

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This book was proposed and organized as a means to present recent developments in the field of nondestructive testing of materials in civil engineering. For this reason, the articles highlighted in this editorial relate to different aspects of nondestructive testing of different materials in civil engineering—from building materials to building structures. The current trend in the development of nondestructive testing of materials in civil engineering is mainly concerned with the detection of flaws and defects in concrete elements and structures, and acoustic methods predominate in this field. As in medicine, the trend is towards designing test equipment that allows one to obtain a picture of the inside of the tested element and materials. From this point of view, interesting results with significance for building practices have been obtained

microstructure --- acoustic emission AE --- rebound hammer --- service life of a structure --- horizontal casting --- precipitation --- natural frequency --- reinforced concrete chimney --- diagnostic --- moisture safety --- adhesion assessment --- gantry crane --- stress wave --- materials research --- acoustic methods --- SEM-EDS analysis --- SilverSchmidt --- reinforced concrete grandstand stadium --- concrete strength --- autoclaved aerated concrete (AAC) --- concrete elements --- reinforced concrete tanks --- degree of degradation --- fatigue tests --- X-ray micro-computed tomography --- GPR method --- defects --- singular value truncation --- ultrasonic tomography --- cement-based composites --- SEM --- moisture of AAC --- sulphate corrosion --- damage --- strengthening --- masonry structures --- eddy-current method --- non-destructive evaluation --- non-destructive testing --- NDT methods --- Structural Health Monitoring --- mercury intrusion porosimetry --- temperature --- vibration analysis --- cesium --- rebar location --- nanoindentation --- monitoring of structures --- RMF technique --- machine learning --- lead --- viscoelastic parameters --- structural tuning --- diagnostics --- resistance measurement --- thermal contrast --- non-destructive method --- destruction process --- asphalt mixtures --- solid-state NMR spectroscopy --- quasi brittle cement composites --- fibre-cement boards --- adhesive joints --- compressive strength --- nondestructive testing --- defect detection --- location of inclusions --- active thermography --- concrete strength prediction --- concrete mix design --- building materials --- micro-computed tomography --- adsorption --- timber structures --- scanning laser vibrometry --- durability --- ultrasonic wave --- surface complexation --- artificial neural networks --- civil engineering --- ultrasonic testing --- ultrasound tests --- acoustic emission --- cellulose fibre cement boards --- concrete --- excitation frequency --- data mining --- crowd-induced excitation --- ultrasound measurements --- wood moisture sensing --- acoustic spectrum --- thermovision --- corrosion processes --- four point bending beam --- spun concrete --- structural damage --- X-ray computed tomography --- waste brick dust --- concrete slabs and floorings --- mathematical morphology --- Burgers model --- pattern recognition --- brittle fracture --- data noise --- drilling resistance --- damage detection --- fiber cement boards --- thermography --- non-destructive methods --- concrete corrosion --- ultrasound --- Lamb waves --- deconvolution --- ultrasonic tests --- creep test --- shape and size of specimen --- building partition --- multiple feedbacks