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  • 1
    Electronic Resource
    Electronic Resource
    Authors' reply
    Amsterdam : Elsevier
    Journal of Sound and Vibration 110 (1986), S. 163 
    Details
    ISSN: 0022-460X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0022-460X(86)80083-9
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  • 2
    Electronic Resource
    Electronic Resource
    Detection and simulation of small trasverse cracks in rotating shafts (1994)
    Springer
    Archive of applied mechanics 64 (1994), S. 206-222 
    Details
    ISSN: 1432-0681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Übersicht Die Erkennung kleiner, ebener Querrisse in Rotoren ist schwierig. Ein erweitertes Verfahren zur Schwingungs-überwachung wird in Laborsuchen erprobt. Es basiert auf einer winkelgebergesteuerten Aufnahme der Rotorschwingungs-signale und der Differenzbildung mit einem Referenzsignal des ungerissenen Rotors. Ein finites Rißelement wird aus räumlichen Finite-Elemente-Berechnungen entwickelt und zur numerischen Simulation des dynamischen Verhaltens angerissener Rotoren verwandt. Die Simulationsergebnisse werden mit den Meßergebnissen verglichen.
    Notes: Summary The detection of small transverse cracks in rotating shafts is difficult. An advanced vibration monitoring method is proved in laboratory tests. It bases on an angle dependent sampling of the vibrational data and the comparison with a reference signal of the undamaged rotor. A finite crack element is developed from a spatial finite element analysis and is used for numerical simulations of the dynamic behaviour of cracked rotors. The results of the numerical simulations are compared with experimental data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00806818
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  • 3
    Electronic Resource
    Electronic Resource
    Bifurcation and stability analysis for a non-smooth friction oscillator (1996)
    Springer
    Archive of applied mechanics 66 (1996), S. 301-314 
    Details
    ISSN: 1432-0681
    Keywords: non-smooth friction oscillator ; stick-slip vibrations ; bifurcation analysis ; chaos ; Lyapunov exponents
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary Friction-induced self-sustained oscillations, also known as stick-slip vibrations, occur in mechanical systems as well as in everyday life. On the basis of a one-dimensional map, the bifurcation behaviour including unstable branches is investigated for a friction oscillator with simultaneous self-and external excitation. The chosen way of mapping also allows a simple determination of Lyapunov exponents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00795247
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  • 4
    Electronic Resource
    Electronic Resource
    Bifurcation and stability analysis for a non-smooth friction oscillator (1996)
    Springer
    Archive of applied mechanics 66 (1996), S. 301-314 
    Details
    ISSN: 1432-0681
    Keywords: Key words non-smooth friction oscillator ; stick-slip vibrations ; bifurcation analysis ; chaos ; Lyapunov exponents
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary  Friction-induced self-sustained oscillations, also known as stick-slip vibrations, occur in mechanical systems as well as in everyday life. On the basis of a one-dimensional map, the bifurcation behaviour including unstable branches is investigated for a friction oscillator with simultaneous selfand external excitation. The chosen way of mapping also allows a simple determination of Lyapunov exponents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00795247
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  • 5
    Electronic Resource
    Electronic Resource
    Steady-state vibrations of an elastic beam on a visco-elastic layer under moving load (2000)
    Springer
    Archive of applied mechanics 70 (2000), S. 399-408 
    Details
    ISSN: 1432-0681
    Keywords: Key words Moving load ; wave radiation ; steady-state response ; dispersion curves ; critical velocity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary  The steady-state response of an elastic beam on a visco-elastic layer to a uniformly moving constant load is investigated. As a method of investigation the concept of “equivalent stiffness” of the layer is used. According to this concept, the layer is replaced by a 1D continuous foundation with a complex stiffness, which depends on the frequency and the wave number of the bending waves in the beam. This stiffness is analyzed as a function of the phase velocity of the waves. It is shown that the real part of the stiffness decreases severely as the phase velocity tends to a critical value, a value determined by the lowest dispersion branch of the layer. As the phase velocity exceeds the critical value, the imaginary part of the equivalent stiffness grows substantially. The dispersion relation for bending waves in the beam is studied to analyze the effect of the layer depth on the critical (resonance) velocity of the load. It is shown that the critical velocity is in the order of the Rayleigh wave velocity. The smaller the layer depth, the higher the critical velocity. The effect of viscosity in the layer on the resonance vibrations is studied. It is shown that the deeper the layer, the smaller this effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004199900071
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  • 6
    Electronic Resource
    Electronic Resource
    Non-smooth mechanical systems – an overview (1998)
    Springer
    Forschung im Ingenieurwesen 64 (1998), S. 223-229 
    Details
    ISSN: 1434-0860
    Source: Springer Online Journal Archives 1860-2000
    Topics: Technology
    Description / Table of Contents: Zusammenfassung Die folgende Übersicht über nichtglatte dynamische Systeme erfolgt ausgehend von einem anwendungsorientierten Standpunkt. Ziel ist es zu zeigen, daß reale technische Fragestellungen häufig zu nichtglatten Systemen führen und deshalb die Notwendigkeit der Behandlung dieser Problemklasse besteht. Außerdem sollen durch das Aufzeigen konkreter praxisrelevanter Beispiele weiterführende Arbeiten stimuliert werden. Gegenwärtig stellen nichtglatte dynamische Systeme eine Herausforderung sowohl für Ingenieure als auch für Mathematiker dar.
    Notes: Abstract The following overview on non-smooth dynamical systems is given from an application point of view. The aim is to show that real world problems often lead to non-smooth systems and, thus, there is a need to deal with such problems. Moreover, further work shall be stimulated by demonstrating some examples of practical relevance. At present, non-smooth systems are a challenge to engineers and mathematicians as well.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00010860
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  • 7
    Electronic Resource
    Electronic Resource
    Untersuchungen zur Dynamik von Magnetschwebefahrzeugen auf elastischen Fahrwegen (1977)
    Springer
    Archive of applied mechanics 46 (1977), S. 1-19 
    Details
    ISSN: 1432-0681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Summary Methods are developed to investigate the dynamical behaviour of magnetically levitated vehicles on flexible guideways. Starting with the analysis of vehicle, suspension and guideway the mathematical model of the closed-loop system is obtained in a systematic way. The results are linear state equations with periodically time-varying coefficients and jumping states. They underlie the evaluation of stability conditions and steady-state responses as well as numerical simulation procedures. The efficiency of the methods is demonstrated by an example.
    Notes: Übersicht Es werden Methoden entwickelt, mit deren Hilfe man das dynamische Verhalten von Magnetschwebefahrzeugen auf elastischen Fahrwegen untersuchen kann. Ausgehend von einer Analyse des Fahrzeugs, der Magnetstellglieder und des Fahrwegs wird in systematischer Weise das mathematische Modell des Gesamtsystems aufgebaut. Es ergeben sich lineare Zustandsgleichungen mit periodisch zeitvariablen Koeffizienten und springenden Zustandsgrößen. Sie bilden die Grundlage für die Berechnung der Stabilitätsbedingungen und der stationären Lösung sowie für eine numerische Simulation. Die Leistungsfähigkeit der Methoden wird anhand eines Beispiels demonstriert.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00534956
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  • 8
    Electronic Resource
    Electronic Resource
    Näherungslösung für die Durchsenkungen eines Balkens unter einer Folge von wandernden Lasten (1977)
    Springer
    Archive of applied mechanics 46 (1977), S. 85-95 
    Details
    ISSN: 1432-0681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Summary An analytical approximation is presented for the deflections of a beam under a sequence of equal and equally spaced moving loads. The comparison with numerical simulation results shows an excellent agreement. The efficiency of the method is demonstrated by an explicitely solved special case.
    Notes: Übersicht Es wird eine analytische Näherungslösung für die Durchsenkungen von Einfeldträgern unter einer Folge von gleichen und gleichabständigen wandernden Lasten angegeben. Der Vergleich mit numerischen Simulationsergebnissen zeigt ausgezeichnete Übereinstimmung. Die Leistungsfähigkeit der Näherungsmethode wird anhand eines explizit gelösten Sonderfalles demonstriert.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00538742
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  • 9
    Electronic Resource
    Electronic Resource
    Berechnungsverfahren für stochastische Fahrzeugschwingungen (1980)
    Springer
    Archive of applied mechanics 49 (1980), S. 235-254 
    Details
    ISSN: 1432-0681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Summary The dynamic analysis of random vehicle vibrations and the consequences especially to human comfort requires an integrated investigation of guideway roughness, nonlinear vehicle dynamics and human response to vibration exposure. Therefore, the complete system is characterized in the frequency as well as in the time domain. Multi-axle excitation inputs are included in the vehicle dynamics. Nonlinearities are considered by statistical linearization techniques. Then, the variances of wheel load variation, car body acceleration and human perception are determined by spectral analysis in frequency domain as well as by covariance analysis in time domain. Comparing both methods the covariance analysis is favourable for linear and, particularly, for nonlinear problems. Its efficiency is illustrated by the random vibration analysis of a nonlinear automobile model.
    Notes: Übersicht Fahrzeuge auf unebenen Fahrwegen führen Zufallsschwingungen aus, durch die Fahrkomfort und Fahrsicherheit beeinträchtigt werden können. Die Analyse solcher Fahrweg-Fahrzeug-Mensch-Systeme bedarf einer umfassenden Untersuchung der zufälligen Fahrwegunebenheiten, der nichtlinearen Fahrzeugdynamik und der menschlichen Schwingungswahrnehmung. Hierfür werden sowohl im Frequenz- als auch im Zeitbereich mathematische Modelle für diese drei Teilsysteme angegeben. Bei mehrachsigen Fahrzeugen wird dabei die Erregung in mehreren Kontaktpunkten berücksichtigt. Eventuell auftretende Nichtlinearitäten werden mit Hilfe der Statistischen Linearisierung behandelt. Die Berechnung der interessierenden stochastischen Kennwerte, d. h. der Varianzen der dynamischen Radlasten, der Fahrzeugaufbaubeschleunigungen und der menschlichen Schwingungswahrnehmung, geschieht mit der Spektraldichtemethode im Frequenzbereich oder der Kovarianzmethode im Zeitbereich. Die Gegenüberstellung der beiden Methoden ergibt Vorteile der Kovarianzmethode sowohl bei linearen als auch insbesondere bei nichtlinearen Problemen. Die dargestellten Rechenverfahren für stochastische Fahrzeugschwingungen werden anhand eines nichtlinearen Automobilmodells beispielhaft veranschaulicht.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01351337
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  • 10
    Electronic Resource
    Electronic Resource
    Analyse von Systemen mit Impuls-Parametererregung (1981)
    Springer
    Archive of applied mechanics 50 (1981), S. 49-60 
    Details
    ISSN: 1432-0681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Summary By impulsive parametric excitation we mean those excitations which may be represented in a mathematical model by periodic coefficients consisting of periodic sequences of Dirac functions. Some examples for this typ of excitation are given. The aim of the paper is the analysis of periodic systems with impulsive parametric excitation regarding deterministic and stochastic disturbances. For that the common simulation techniques are used beside the methods based on Floquet's theory, which are extended to the given system typ. The benefit of the latter methods is a reduction of integration time to only one period.
    Notes: Übersicht Unter Impuls-Parametererregung versteht man eine Erregungsart, die im mathematischen Modell durch periodische Koeffizienten in Form periodischer Folgen von Dirac-Funktionen beschrieben werden kann. Einige Beispiele für diesen Erregertyp sind angegeben. Ziel der vorliegenden Arbeit ist die Analyse von periodischen Systemen mit Impuls-Parametererregung unter Berücksichtigung deterministischer und stochastischer Störungen. Neben den üblichen Simulationsmethoden dienen dazu die auf der Floquetschen Theorie basierenden Verfahren, die so erweitert werden, daß sie auf den gegebenen Systemtyp anwendbar sind. Der Vorteil der letztgenannten Methoden liegt in einer Verkürzung der Integrationszeit auf nur eine Periodendauer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00536307
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