Schwingungen mechanischer Antriebssysteme

Dresig, Hans; Fidlin, Alexander

doi:10.1007/978-3-662-59137-6

Cited by 13 publications

(8 citation statements)

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“…Caused by the present hexagonal tooth mesh, additional axial forces occur, which bend and axial squeeze the combination of shafts, bearings and freewheel. There can be additional non-linear effects at each coupling point within the system, e.g., due to clearance, displacement-variable stiffness, damping or even friction-based excitation [28].…”

Section: Excitation Effectsmentioning

confidence: 99%

“…Its strategy is to conclude towards a general calculation approach, which is valid for the used application. Contrary to this, deduction means starting with an oversized model and reducing it towards a simplified one by evaluating the system parameters and analysing its sensitivities [21,28].…”

Section: Model Development By Deduction and Inductionmentioning

confidence: 99%

“…Figure 7 illustrates and specifies the overall approach to develop and validate the simulation model derived from [28]. It mainly contains the process of modelling and simulation, physical testing, parameter comparison and model optimisation.…”

Section: Overall Approachmentioning

confidence: 99%

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A Novel Approach to Predict the Structural Dynamics of E-Bike Drive Units by Innovative Integration of Elastic Multi-Body-Dynamics

Steinbach,

Lechler,

Kraemer

et al. 2023

Vehicles

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This paper presents a novel approach to address noise, vibration, and harshness (NVH) issues in electrically assisted bicycles (e-bikes) caused by the drive unit. By investigating and optimising the structural dynamics during early product development, NVH can decisively be improved and valuable resources can be saved, emphasising its significance for enhancing riding performance. The paper offers a comprehensive analysis of the e-bike drive unit’s mechanical interactions among relevant components, culminating—to the best of our knowledge—in the development of the first high-fidelity model of an entire e-bike drive unit. The proposed model uses the principles of elastic multi body dynamics (eMBD) to elucidate the structural dynamics in dynamic-transient calculations. Comparing power spectra between measured and simulated motion variables validates the chosen model assumptions. The measurements of physical samples utilise accelerometers, contactless laser Doppler vibrometry (LDV) and various test arrangements, which are replicated in simulations and provide accessibility to measure vibrations onto rotating shafts and stationary structures. In summary, this integrated system-level approach can serve as a viable starting point for comprehending and managing the NVH behaviour of e-bikes.

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Section: Excitation Effectsmentioning

confidence: 99%

Section: Model Development By Deduction and Inductionmentioning

confidence: 99%

See 1 more Smart Citation

A Novel Approach to Predict the Structural Dynamics of E-Bike Drive Units by Innovative Integration of Elastic Multi-Body-Dynamics

Steinbach,

Lechler,

Kraemer

et al. 2023

Vehicles

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“…Dabei werden auf Basis des aktuellen Wissensstandes Annahmen über die Relevanz der Informationen getroffen, wodurch relevante Informationen vernachlässigt, als irrelevant angesehen oder nur oberflächlich abgebildet werden [11]. Bei der Modellerstellung kann grundsätzlich auf zwei Weisen vorgegangen werden -induktiv und deduktiv [5,12]. Bei der induktiven Vorgehensweise geht der Modellbildende von einfachen Modellen aus und erweitert diese stetig, beim einem deduktiven Vorgehen wird der Informationsgehalt auf Basis von Wissen und Annahmen kontinuierlich auf das wesentliche reduziert.…”

Section: Unsicherheiten Bei Der Modellierungunclassified

Modellierung einer Einscheibentrockenkupplung mithilfe des C&C2-Ansatzes zur Identifikation von kritischen Gestalt-Funktion-Zusammenhängen bezüglich des Schwingungsphänomens zwangserregtes Kupplungsrupfen

Tröster

Klotz

Rapp

et al. 2021

Forsch Ingenieurwes

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ZusammenfassungIn diesem Beitrag wird ein systematisches Vorgehen zur Identifikation von kritischen Gestalt-Funktion-Zusammenhängen mit Einfluss auf zwangserregtes Kupplungsrupfen entwickelt. Dazu wird am Beispiel einer Einscheibentrockenkupplung ein Modell mit dem C&C2-Ansatz erstellt und analysiert. Dadurch werden Entwickler bei der Auswahl kritischer Einflussfaktoren für das zwangserregte Kupplungsrupfen unterstützt. Zudem werden bisher vorhandene Lücken bei der Erklärung der Wirkzusammenhänge zwischen den Einflussfaktoren und zwangserregtem Kupplungsrupfen geschlossen. Hierzu werden C&C2-Modelle zur Erklärung dieser Wirkzusammenhänge über verschiedene Systemebenen hinweg gebildet und die Kritikalität von Modellelementen bezüglich Kupplungsrupfen eingeschätzt. Einflussfaktoren aus der Systemumgebung werden konsistent in die erstellten Modelle integriert, um die Wirkzusammenhänge systemebenenübergreifend darzustellen. Auf Basis der Modelle werden Hypothesen zu den Wirkzusammenhängen der Einflussfaktoren gebildet. Die Hypothesen legen die Grundlage für die Konzipierung eines Prüfaufbaus, mit dessen Hilfe die qualitativen Modelle validiert und im weiteren Verlauf des Forschungsvorhabens quantifiziert werden. Auf Basis der Modelle werden zukünftig systematisch Ideen zur Reduzierung von Kupplungsrupfen mit Elementen aus dem Modell der PGE abgeleitet und bezüglich ihres Potenzials bewertet.

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“…Therefore the possibility to avoid situations with high vibration amplitudes by choosing a suitable pretension or using custom path planning strategies considering the acting forces and the interaction between the belt and the surrounding structure play an important practical role. In [3] one can find the formula f i = i 2L T0 ρA for i = 1, 2, 3... to approximate the eigenfrequencies for constant belt lengths and slow belt speeds. In order to analyse the resulting amplitudes with numerical solutions from the derived model, the system must be suitably excited.…”

Section: Frequency Analysismentioning

confidence: 99%

Frequency analysis of transversal vibrations of belt drives with time‐varying belt lengths

Schnürer

Holl

2021

Proc Appl Math & Mech

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The dynamic positioning accuracy and the smoothness are key aspects of linear belt drives where vibrations have a negative impact. A FE-Model, based on a one-dimensional analytical model of the belt, is derived to study the respective effects for different parameters. The model considers the dominant transverse deflection and a quasi-static assumption for the longitudinal deformation. The possibility to consider various time-varying belt lengths, the belt mass, stiffness and tension force is an essential part of the modeling. The non-linear cable effect is demonstrated by comparison with the linearized solution.Vibrations for the cases of constant and variable belt length are investigated and compared to common in literature used approximation formulas for the resonance frequencies of such systems. The influence on positioning deviations and the use of vibration reduction techniques considering the different belt sections of the linear drive can be derived from the computed results and are topics for future research.

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Schwingungen mechanischer Antriebssysteme

Cited by 13 publications

References 0 publications

A Novel Approach to Predict the Structural Dynamics of E-Bike Drive Units by Innovative Integration of Elastic Multi-Body-Dynamics

A Novel Approach to Predict the Structural Dynamics of E-Bike Drive Units by Innovative Integration of Elastic Multi-Body-Dynamics

Modellierung einer Einscheibentrockenkupplung mithilfe des C&C2-Ansatzes zur Identifikation von kritischen Gestalt-Funktion-Zusammenhängen bezüglich des Schwingungsphänomens zwangserregtes Kupplungsrupfen

Frequency analysis of transversal vibrations of belt drives with time‐varying belt lengths

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