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  • 1
    Electronic Resource
    Electronic Resource
    An Efficient General Purpose Contact Search Algorithm Using the Relative Coordinate System for Multibody System Dynamics (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 120 (Feb. 2007), p. 129-134 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Dynamic analysis of many mechanical systems is often involved with contacts amongbodies. This paper presents an efficient and general-purpose contact search algorithm for multibodydynamics in the context of the compliance contact force model. While many conventional collisiondetection algorithms are based on the absolute coordinate system, this paper proposes to use therelative coordinate system in detecting a contact. A boundary box of a defense surface geometry isdivided into many blocks. A contact reference frame is defined on the defense body of a contactpair. Since all geometric variables necessary to detect a contact are measured relative to the contactreference frame attached to the defense body, the variables belonging to the defense body areconstant, which significantly reduces computation time associated with the contact search.Therefore, the contact reference frame plays a key role in developing an efficient contact searchalgorithm. Contour of the defense body is approximated by many piecewise triangular patches,while contour of the hitting body is represented by hitting nodes along its boundary. Boundingboxes inside which contain each body of a contact pair are defined at a preprocessing stage toeliminate an exhaustive contact inspection when two bodies are in a distance. If two boundingboxes are turned out to be in a contact during the pre-search, each node on the hitting boundary isinspected to find out to which block the node belongs in the post-search. Since each block dividingthe boundary of the defense body has a list of patches, each node on the hitting boundary is testedfor a contact only with the patches in the block that the node belongs. Actual contact calculation isthen carried out to find the contact penetration used in calculating the compliant contact force.Numerical example is performed to demonstrate the validity of the proposed method
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.120.129.pdf
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A Relative Method for Finite Element Nonlinear Structural Analysis (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 505-507 (Jan. 2006), p. 577-582 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Nodal displacements are referred to the initial configuration in the totalLagrangian formulation and to the last converged configuration in the updatedLagrangian formulation. This research proposes a relative nodal displacement method to represent the position and orientation for a node in truss structures. Since the proposed method measures the relative nodal displacements relative to its adjacent nodal reference frame, they are still small for a truss structure undergoing large deformations for the small size elements. As a consequence, element formulations developed under the small deformation assumption are still valid for structures undergoing large deformations, which significantly simplifies the equations of equilibrium. A structural system is represented by a graph to systematically develop the governing equations of equilibrium for general systems. A node and an element are represented by a node and an edge in graph representation, respectively. Closed loops are opened to form aspanning tree by cutting edges. Two computational sequences are defined in the graph representation. One is the forward path sequence that is used to recover the Cartesian nodal displacements from relative nodal displacements and traverses a graph from the base node towards the terminal nodes. The other is the backward path sequence that is used to recover the nodal forces in the relative coordinate system from the known nodal forces in the absolute coordinate system and traverses from the terminal nodes towards the base node. One closed loop structure undergoing large deformations is analyzed todemonstrate the efficiency and validity of the proposed method
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/11/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.505-507.577.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Safety Diagnosis of Collided Subway Electric Multiple Units (EMUs) (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 297-300 (Nov. 2005), p. 1876-1881 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Engineering safety diagnosis of collided subway electric multiple units (EMUs) was conducted for safety assessment. Several advanced engineering analysis techniques including nondestructive evaluation (NDE) techniques and stress and structural analyses programs, were performed for better understandings and exploration of failure analysis and safety concerns. NDE techniques such as ultrasonic testing and magnetic particle testing, were used to detect manufactureinduced and/or in-service defects and collision-induced flaws, and measure the dimensions of deformed and non-deformed parts on damaged EMUs due to a rear-end collision. Moreover, stress and structural analyses using commercial I-DEAS software provided important information on stress distribution and load transfer mechanisms as well as the amount of damages during the crash. A good agreement has been found between structural analysis results and the results of actual damages in EMUs during crash. In this investigation, various advanced engineering analysis techniques for the safety analysis of subway EMUs have been introduced and the analysis results have been used to rovide the critical information for the safety assessment of collided EMUs
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.297-300.1876.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Damage Characterization of Ceramic Matrix Composites (CMCs) during Tensile Testing (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 297-300 (Nov. 2005), p. 2533-2538 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Nondestructive evaluation (NDE) techniques were used for the tensile damagecharacterization in ceramic matrix composites (CMCs). Ultrasonic testing (UT) and infrared (IR) thermography were employed to assess defects and/or damage evolution before and during mechanical testing. Prior to tensile testing, a UT C-scan and a xenon flash method were performed to obtain initial defect information in light of UT C-scans and thermal diffusivity maps, respectively. An IR camera was used for in-situ monitoring of progressive damages. The IR camera measured temperature changes during tensile testing. This paper has presented the feasibility of using NDE techniques to interpret structural performance of CMCs
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.297-300.2533.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    A decoupled flexible-relative co-ordinate recursive approach for flexible multibody dynamics (1991)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 32 (1991), S. 1669-1689 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: An extended kinematic graph concept and a variational-vector calculus approach are employed to develop a new recursive formulation for the dynamic analysis of flexible multibody systems. The extended graph concept introduced defines frames and transformations between frames as nodes and edges, respectively, rather than the more traditional body and joint convention. Kinematic relationships between adjacent flexible bodies are derived, using joint relative co-ordinates and a state vector notation that represents both translational and rotational components of velocity. Deformation kinematics are formulated in terms of modal co-ordinates, under small deformation assumptions. Joint relative co-ordinates are decoupled from deformation modal co-ordinates in both kinematic relations and in the recursive dynamics algorithm, leading to a significant reduction in the dimension of matrices that must be inverted. Dynamic analysis of a flexible closed-loop spatial robot is performed to illustrate the efficiency of the algorithm.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620320810
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  • 6
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    Design sensitivity analysis of dynamic responses for a BLDC motor with mechanical and electromagnetic interactions (2012)
    Elsevier
    Details
    Publication Date: 2012-04-01
    Print ISSN: 0022-460X
    Electronic ISSN: 1095-8568
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Elsevier
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    PAPER CURRENT
  • 7
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    A study of the kinematic characteristic of a coupling device between the buffer system and the flexible pipe of a deep-seabed mining system (2014)
    Elsevier
    Details
    Publication Date: 2014-09-01
    Print ISSN: 2092-6782
    Electronic ISSN: 2092-6790
    Topics: Architecture, Civil Engineering, Surveying
    Published by Elsevier
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    PAPER CURRENT
  • 8
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    A decoupled recursive approach for constrained flexible multibody system dynamics (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A variational-vector calculus approach is employed to derive a recursive formulation for dynamic analysis of flexible multibody systems. Kinematic relationships for adjacent flexible bodies are derived in a companion paper, using a state vector notation that represents translational and rotational components simultaneously. Cartesian generalized coordinates are assigned for all body and joint reference frames, to explicitly formulate deformation kinematics under small deformation kinematics and an efficient flexible dynamics recursive algorithm is developed. Dynamic analysis of a closed loop robot is performed to illustrate efficiency of the algorithm.
    Keywords: NUMERICAL ANALYSIS
    Type: Jet Propulsion Lab., California Inst. of Tech., Proceedings of the 3rd Annual Conference on Aerospace Computational Control, Volume 2; p 492-512
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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