Optimizing lightweight structures with particle damping using frequency based substructuring

Oltmann, Jan; Hartwich, Tobias S.; Krause, Dieter

doi:10.1017/dsj.2020.13

Cited by 8 publications

(2 citation statements)

References 19 publications

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“…Later, they used the FBS experimental method to obtain the 12-DOF rubber isolator models and performed parametric NVH design optimization of complex industry-relevant assemblies by the combination of FBS and blocked force TPA [109]. A similar problem was discussed in the design of a particle damper using the FBS method [110].…”

Section: Frequency-based Substructuring (Fbs) Methodsmentioning

confidence: 99%

Measurement, Modeling, and Analysis of the Dynamic Properties of Resilient Elements Used for Vibration Isolation

Sun,

Thompson

2023

Journal of Vibration and Acoustics

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Resilient elements are widely applied for vibration and noise control in many areas of engineering. Their complex dynamic stiffness gives fundamental information to describe their dynamic performance and is required for predicting structure-borne sound and vibration using dynamic modelling. Many laboratory measurement methods have been developed to determine the dynamic properties of resilient elements. This paper presents a review of recent developments of the measurement methods from the perspective of force-displacement relations of the resilient element assembly rather than of their material properties. To provide context, the review begins with an introduction to modelling methods for resilient elements, especially for rubber and rubber-like isolators, and three standardized measurement methods are introduced. Recent developments are then discussed including methods to extend the frequency range, which are mainly developments of the indirect method. Mobility methods, modal-based methods, recent active frequency-based substructuring (FBS) and inverse substructuring (IS) methods to study the dynamic properties of resilient elements are also described. Laboratory test rigs and the corresponding identification methods are outlined. Methods to evaluate nonlinear dynamic properties of resilient elements by laboratory measurements are also discussed. Finally, the review is concluded by discussing advantages and limitations of the existing methods and giving suggestions for future research.

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Section: Frequency-based Substructuring (Fbs) Methodsmentioning

confidence: 99%

Measurement, Modeling, and Analysis of the Dynamic Properties of Resilient Elements Used for Vibration Isolation

Sun,

Thompson

2023

Journal of Vibration and Acoustics

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“…Recently, particle damping has been utilized in order to prevent high vibration amplitudes in lightweight structures, as it only leads to a comparably little mass increase. Yet, the prediction of damping parameters is difficult and trial-and-error experiments are still common procedures [30]. Aside from this, sandwich structures-if applicable-can be stiff and lightweight components with high damping properties, if the material and structure of core and face sheets are ideally selected [26].…”

Section: Introductionmentioning

confidence: 99%

Diatom-Inspired Structural Adaptation According to Mode Shapes: A Study on 3D Structures and Software Tools

Andresen,

Ahmad Basri

2024

Biomimetics

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Diatoms captivate both biologists and engineers with their remarkable mechanical properties and lightweight design principles inherent in their shells. Recent studies have indicated that diatom frustules possess optimized shapes that align with vibrational modes, suggesting an inherent adaptation to vibratory loads. The mode shape adaptation method is known to significantly alter eigenfrequencies of 1D and 2D structures to prevent undesired vibration amplitudes. Leveraging this insight, the diatom-inspired approach to deform structures according to mode shapes was extended to different complex 3D structures, demonstrating a significant enhancement in eigenfrequencies with distinct mode shapes. Through extensive parameter studies, frequency increases exceeding 200% were obtained, showcasing the method’s effectiveness. In the second study part, the studied method was integrated into a user-friendly, low-code software facilitating swift and automated structural adjustments for eigenfrequency optimization. The created software tools, encompassing various components, were successfully tested on the example structures demonstrating the versatility and practicality of implementing biomimetic strategies in engineering designs. Thus, the present investigation does not only highlight the noteworthiness of the structural adaptation method inspired by diatoms in maximizing eigenfrequencies, but also originate software tools permitting different users to easily apply the method to distinct structures that have to be optimized, e.g., lightweight structures in the mobility or aerospace industry that are susceptible toward vibrations.

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Pulse mitigation in ordered granular structures: from granular chains to granular networks

Espinosa,

Calius,

Hall

et al. 2024

Nonlinear Dyn

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Ordered granular structures have garnered considerable attention across various fields due to their capacity to manipulate the transmission of mechanical energy and mitigate the adverse effects of impacts and vibrations. The ability to control wave propagation is crucial in the design of protective equipment, seismic isolation systems, aerospace vibroacoustic attenuation and shock-absorbing materials, among many other applications. Here, we delve into the myriad configurations of ordered granular systems: from one dimensional granular chains to granular chain networks, showcasing their significance for pulse mitigation. Given the unique behaviours that these granular structures can generate, they can be described as discrete or granular metamaterials. A detailed analysis of the wave behaviour in these structures is presented, encompassing the influence of heterogeneity, chain curvature, and dimensional complexity on energy dissipation. This discourse extends to encompass a comparison of analytical and numerical approaches used in the examination and application of these systems, along with an exploration of the implications of advances in manufacturing methods. Unlike other examinations, this comprehensive review underscores the multifaceted nature of our study, with a steadfast focus on their applicability to impact mitigation and wave control. We conclude with a summary on the current challenges and future outlook of engineered granular systems, emphasizing their transformative potential in safeguarding structures from dynamic forces and advancing the frontier of energy management technologies.

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Optimizing lightweight structures with particle damping using frequency based substructuring

Cited by 8 publications

References 19 publications

Measurement, Modeling, and Analysis of the Dynamic Properties of Resilient Elements Used for Vibration Isolation

Measurement, Modeling, and Analysis of the Dynamic Properties of Resilient Elements Used for Vibration Isolation

Diatom-Inspired Structural Adaptation According to Mode Shapes: A Study on 3D Structures and Software Tools

Pulse mitigation in ordered granular structures: from granular chains to granular networks

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