Untitled

Shabana, Ahmed A.

doi:10.1023/a:1008072517368

Cited by 145 publications

(13 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In order to find a more meaningful list of keywords for each community, the keywords 'multibody', 'multibody dynamics', 'multibody system' and 'multibody system dynamics' were excluded. (24) railway vehicle (36) large deformation (38) contact force (43) vehicle dynamics (19) optimization (24) finite element method (23) railway dynamics (33) dynamics (29) impact (42) simulation (19) crashworthiness (23) model reduction (23) wear (32) finite element method (27) contact (35) real-time simulation (17) topology optimization (17) model order reduction (20) vehicle dynamics (32) simulation (25) clearance (26) redundant constraints (14) vehicle dynamics (16) simulation (18) derailment (27) absolute nodal coordinate (24) dynamics (26) constrained multibody system (14) simulation (16) modal analysis (15) finite element method (25) finite element (18) contact dynamics (25) numerical integration (12) parameter identification (15) rigid-flexible coupling (14) vehicle-track interaction (25) modeling (15) joint clearance (25) subsystem synthesis method (11) dynamics (12) dynamic stiffening (13) simulation (21) large displacements (14) revolute clearance joint…”

Section: Detection Of Thematic Communitiesmentioning

confidence: 99%

“…The formulation in absolute nodal coordinates, the absolute nodal coordinate formulation (ANCF) [17,25,26], also uses a set of coordinates defined in an inertial reference frame. This formulation was originally developed using a local reference frame to measure the deformations of the finite elements [17,27], so it could be considered as a co-rotational method.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Detection of Communities within the Multibody System Dynamics Network and Analysis of Their Relations

et al. 2019

View full text Add to dashboard Cite

Multibody system dynamics is already a well developed branch of theoretical, computational and applied mechanics. Thousands of documents can be found in any of the well-known scientific databases. In this work it is demonstrated that multibody system dynamics is built of many thematic communities. Using the Elsevier’s abstract and citation database SCOPUS, a massive amount of data is collected and analyzed with the use of the open source visualization tool Gephi. The information is represented as a large set of nodes with connections to study their graphical distribution and explore geometry and symmetries. A randomized radial symmetry is found in the graphical representation of the collected information. Furthermore, the concept of modularity is used to demonstrate that community structures are present in the field of multibody system dynamics. In particular, twenty-four different thematic communities have been identified. The scientific production of each community is analyzed, which allows to predict its growing rate in the next years. The journals and conference proceedings mainly used by the authors belonging to the community as well as the cooperation between them by country are also analyzed.

show abstract

Section: Detection Of Thematic Communitiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Detection of Communities within the Multibody System Dynamics Network and Analysis of Their Relations

et al. 2019

View full text Add to dashboard Cite

show abstract

“…The ANCF is a non-incremental, finite-element method that can be used to describe large rotations and large deformations in applications of multibody system dynamics [24][25][26]. The formulation uses a position vector and gradient vectors as the nodal coordinates.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Absolute Nodal Coordinate Formulation in a Pre-Stressed Large-Displacements Dynamical System

Skrinjar

Slavič

Boltežar

2017

Stroj. vest. - Jour. Mech. Eng.

View full text Add to dashboard Cite

The design process for dynamical models has to consider all the properties of a mechanical system that have an effect on its dynamical response. In multi-body dynamics, flexible bodies are frequently modeled as rigid, resulting in non-valid Keywords: ANCF, pre-stress, multibody system, measurement Highlights • A numerical model of a rigid-flexible multibody system is used in the analysis of kinematic properties during switch-off. • A flexible body is modeled with the Absolute Nodal Coordinate Formulation to include the pre-stress effect. • The influence of different parameters on the switch-off time and the contact distance is investigated. • The numerical model was validated and shows good agreement with the experimental values. INTRODUCTIONWhen modeling dynamical systems the proper material and contact properties of the numerical model are crucial for simulating an accurate dynamic response. One of the properties to be considered is the effect of pre-stress on rigid and flexible bodies, as it can have a significant impact on the dynamical response of multibody mechanical systems.The modeling of deformable bodies in a multibody system can be done using a floating frame of reference (FFR) [1], which is based on the classic finite element (FE) method that is widely used in a variety of applications [2] and [3]. While in a floating frame of reference formulation a mixed set of absolute reference and local elastic coordinates are used, in the absolute nodal coordinate formulation (ANCF) only absolute coordinates are used, which include global displacement and global vector gradients [4]. The ANCF is a non-incremental method and it has been used for solving many different problems in mechanics, such as vehicle components [5] and [6], the modeling of belt drives [7], railroad applications [8], bio-mechanics [9] and also in the field of digital image correlation (DIC) [10]. The main features of the ANCF are a constant mass matrix, zero centrifugal and Coriolis inertia forces and the possibility for exact modeling of rigid-body movement.The modeling of the pre-stress effect on bodies in mechanical systems is an interesting research topic in civil-engineering applications [11], where the static [12] and dynamic responses of structural elements are considered [13]. The effect of pre-stress is introduced to the ANCF finite elements to create an accurate model of a leaf spring, where pre-stress is evaluated based on the known geometrical states in the undeformed and deformed configurations that define the vector of absolute nodal coordinates [14]. In [15] the effect of the non-dimensional axial pre-stress of eigenfrequencies on a simply supported beam is researched. The pre-stress effect is included in the model of a flexible multibody belt-drive [16], where the belt-drive is modeled with ANCF two-dimensional shear deformable beam elements that account for the longitudinal and shear deformations.When modeling mechanical systems [17-20] a validation is needed to evaluate the results from the numerical model, this can be ...

show abstract

“…However, it is not possible with the floating frame of reference approach to efficiently consider large nonlinear deformations. In contrast, the absolute nodal coordinate formulation (ANCF) is proposed in [27] to accurately model large nonlinear deformations and rotations. The ANCF is applied to describe the motion of cables, flexible pendulums [11], rubber chains [16] and tyres [31].…”

Section: Introductionmentioning

confidence: 99%

Application of Stable Inversion to Flexible Manipulators Modeled by the ANCF

Drücker¹,

Seifried²

2022

Preprint

View full text Add to dashboard Cite

Compared to conventional robots, flexible manipulators offer many advantages, such as faster end-effector velocities and less energy consumption. However, their flexible structure can lead to undesired oscillations. Therefore, the applied control strategy should account for these elasticities. A feedforward controller based on an inverse model of the system is an efficient way to improve the performance. However, unstable internal dynamics arise for many common flexible robots and stable inversion must be applied. In this contribution, an approximation of the original stable inversion approach is proposed. The approximation simplifies the problem setup, since the internal dynamics do not need to be derived explicitly for the definition of the boundary conditions. From a practical point of view, this makes the method applicable to more complex systems with many unactuated degrees of freedom. Flexible manipulators modeled by the absolute nodal coordinate formulation (ANCF) are considered as an application example.

show abstract

Untitled

Cited by 145 publications

References 14 publications

Detection of Communities within the Multibody System Dynamics Network and Analysis of Their Relations

Detection of Communities within the Multibody System Dynamics Network and Analysis of Their Relations

Absolute Nodal Coordinate Formulation in a Pre-Stressed Large-Displacements Dynamical System

Application of Stable Inversion to Flexible Manipulators Modeled by the ANCF

Contact Info

Product

Resources

About