Interface reduction for Hurty/Craig-Bampton substructured models: Review and improvements

Krattiger, Dimitri; Wu, Long; Zacharczuk, Martin; Buck, Martin; Kuether, Robert J.; Allen, Matthew S.; Tiso, Paolo; Brake, Matthew Robert

doi:10.1016/j.ymssp.2018.05.031

Cited by 76 publications

(22 citation statements)

References 23 publications

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“…The resulting reduced components are then assembled to create the final reduced system. A further reduction can follow the first local reductions to condense the so-called interface modes [17,21,28] or to create an equivalent rigid body model [19]. Here, a different approach based on global modes is employed.…”

Section: Global Modesmentioning

confidence: 99%

Global modes for the reduction of flexible multibody systems

Cammarata

2021

Multibody Syst Dyn

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Modeling a flexible multibody system employing the floating frame of reference formulation (FFRF) requires significant computational resources when the flexible components are represented through finite elements. Reducing the complexity of the governing equations of motion through component-level reduced-order models (ROM) can be an effective strategy. Usually, the assumed field of deformation is created considering local modes, such as normal, static, or attachment modes, obtained from a single component. A different approach has been proposed in Cammarata (J. Sound Vibr. 489, 115668, 2020) for planar systems only and involves a reduction based on global flexible modes of the whole mechanism. Through the use of global modes, i.e., obtained from an eigenvalue analysis performed on the linearized dynamic system around a certain configuration, it is possible to obtain a modal basis for the flexible coordinates of the multibody system. Here, the same method is extended to spatial mechanisms to verify its applicability and reliability. It is demonstrated that global modes can be used to create ROM both at the system and component levels. Studies on the complexity of the method reveal this approach can significantly reduce the calculation times and the computational effort compared to the unreduced model. Unlike the planar case, the numerical experiments reveal that the system-level approach based on global modes can suffer from slow convergence speed and low accuracy in results.

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Section: Global Modesmentioning

confidence: 99%

Global modes for the reduction of flexible multibody systems

Cammarata

2021

Multibody Syst Dyn

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“…This study used the finite element vehicle body built by Lin [16] and the flexible multi-body dynamic chassis model built by Yang [17], and incorporated both models into the commercial software, HyperWorks. All the rest model build, and settings of material properties for all components and boundary conditions were done in HyperWorks/Optistruct, and then utilized the Craig-Bampton substructure modal method [18,19] to create the flexible bodies which were then fed into HyperWorks/MotionView to set up all the joints and connections for all of the parts, as well as the tire model and the pseudo-road for the flexible multi-body dynamic analyses. The analyses were performed using HyperWorks/MotionSolve.…”

Section: Research Backgroundmentioning

confidence: 99%

Developing a Strategy to Improve Handling Behaviors of a Medium-Size Electric Bus Using Active Anti-Roll Bar

2020

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Electric vehicles are a major trend in research and development in the automobile industry. A vehicle’s handling ability is changed when the structure of the power system is altered, which is more obvious in medium-sized buses with higher load and a longer body whose body stiffness is relatively less stiff. In this context, flexible multi-body dynamic modeling, instead of rigid body modeling, is used to reflect the stiffness effects of the vehicle body and chassis systems. A control strategy is developed with an active variable stiffness anti-roll bar to improve vehicle handling characteristics by using the flexible body dynamic simulation with consideration of the step and single sinusoidal steering input tests. Through simulation, it was learned that the proposed control strategy could reduce the time of stabilization by 54.08% and suppress undesired handling behaviors in the step steering input test. Moreover, at high speed, the original unsteady condition became stabilized with little sacrifice in yaw velocity. In the single sinusoidal steering input test, the time of stabilization could be reduced by 8.43% and with 14.6% less yaw angle changes in the improved design. The overall handling was improved.

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“…Dynamic substructuring addresses this issue and encompasses several methodologies that aim to decompose the system into individual entities, treat them separately and finally assemble them properly to obtain the global response. A detailed overview of the notion is provided in [4], whereas recent advances are discussed in [5,6], including comparative assessments, experimental techniques and industrial applications. Most of the methodologies that adhere to dynamic substructuring can approximate each component's underlying physics separately by employing some form of fundamental modes.…”

Section: Introductionmentioning

confidence: 99%

On the Coupling of Reduced Order Modeling with Substructuring of Structural Systems with Component Nonlinearities

Vlachas

Tatsis

Agathos

et al. 2021

Conference Proceedings of the Society for Experimental Mechanics Series

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The emergence of digital virtualization has brought Reduced Order Models (ROM) into the spotlight. A successful reducedorder representation should allow for modeling of complex effects, such as nonlinearities, and ensure validity over a domain of inputs. Parametric Reduced Order Models (pROMs) for nonlinear systems attempt to accommodate both previous requirements [1]. Our work addresses a physics-based reduced representation of structural systems with localized nonlinear features. Via implementation of the approach described in [2], we achieve a substructuring formulation similar to Component Mode Synthesis. However, instead of individual component modes, reduction modes of a global nature are obtained from the corresponding linear monolithic system. In turn, this technique allows for a divide and conquer strategy that naturally couples the response between linear and nonlinear subdomains. A pROM able to exploit this modular formulation is developed as a next step. The framework treats each component independently, and individual projection bases are assembled by applying a Proper Orthogonal Decomposition (POD) on snapshots of each subdomain's response. Parametric dependencies on the boundary conditions and the structural and excitation traits are injected into the pROM utilizing clustering, following the methodology in [3]. To this end, a modified strategy is employed, relying on the Modal Assurance Criterion as a measure to indicate optimal training samples while defining regions with similar underlying dynamics on the domain of parametric inputs. A numerical case study of a 3D wind turbine tower featuring material nonlinearities exemplifies our approach. The derived pROM offers an accelerated approximation of the underlying high fidelity response and can be utilized for numerous tasks, including vibration control, residual life estimation, and condition assessment of hotspot locations.

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Interface reduction for Hurty/Craig-Bampton substructured models: Review and improvements

Cited by 76 publications

References 23 publications

Global modes for the reduction of flexible multibody systems

Global modes for the reduction of flexible multibody systems

Developing a Strategy to Improve Handling Behaviors of a Medium-Size Electric Bus Using Active Anti-Roll Bar

On the Coupling of Reduced Order Modeling with Substructuring of Structural Systems with Component Nonlinearities

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