Study for Efficient Simulation of a Full Vehicle System in Mid Frequency Range Using Modal Synthesis Method

Component Modal Synthesis Methods Based on Hybrid Models, Part II: Numerical Tests and Experimental Identification of Hybrid Models

Journal of Applied Mechanics ◽

10.1115/1.2901384 ◽

1994 ◽

Vol 61 (1) ◽

pp. 109-116 ◽

Cited By ~ 11

Author(s):

L. Jezequel ◽

H. D. Setio

Keyword(s):

Synthesis Method ◽

Hybrid Models ◽

Synthesis Methods ◽

Mass Loading ◽

Frequency Range ◽

Compatibility Conditions ◽

Experimental Identification ◽

Numerical Tests ◽

Modal Synthesis ◽

Vibration Tests

A double modal synthesis method in which compatibility conditions at substructure interfaces are ensured by the introduction of loaded modes is presented in this study. These loaded modes, which are obtained by introducing mass loading or stiffness loading along the boundaries, are used to define generalized boundary coordinates. Thus the hybrid models presented in the first part of this study are developed so that they can be derived from test data as results of independent modal identifications. Unlike in classical modal synthesis methods, in this double modal synthesis method, it is not necessary to clamp the interfaces, which is always difficult to carry out during vibration tests. By introducing loaded modes, generalized boundary coordinates which represent boundary deformability in the frequency range under study can be defined.

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Development of an Experimental Modal Synthesis Method for Coupled Acoustic-Structural Systems

10.4271/922089 ◽

1992 ◽

Cited By ~ 1

Author(s):

Akinori Iwama ◽

Haruki Yashiro ◽

Tesshin Sakata

Keyword(s):

Synthesis Method ◽

Structural Systems ◽

Modal Synthesis

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Modal synthesis method of lateral vibration analysis for rotor-bearing system

Computers & Structures ◽

10.1016/s0045-7949(02)00294-8 ◽

2002 ◽

Vol 80 (32) ◽

pp. 2537-2549 ◽

Cited By ~ 10

Author(s):

Chun-Ping Zou ◽

Hong-Xing Hua ◽

Duan-Shi Chen

Keyword(s):

Vibration Analysis ◽

Synthesis Method ◽

Lateral Vibration ◽

Modal Synthesis ◽

Rotor Bearing ◽

Bearing System

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Contact Modeling Technique of a Flexible Piston and Cylinder Using Modal Synthesis Method

Volume 6: 5th International Conference on Multibody Systems, Nonlinear Dynamics, and Control, Parts A, B, and C ◽

10.1115/detc2005-84721 ◽

2005 ◽

Author(s):

W. K. Kim ◽

S. H. Sohn ◽

H. J. Cho ◽

D. S. Bae ◽

J. H. Choi

Keyword(s):

Contact Force ◽

Synthesis Method ◽

Normal Modes ◽

Modeling Technique ◽

Mode Shapes ◽

Dynamics Analysis ◽

Contact Modeling ◽

Static Correction ◽

Modal Synthesis ◽

Contact Surfaces

In this paper, contact modeling technique and dynamics analysis of piston and cylinder system are presented by using modal synthesis method. It is very important to select mode shapes representing a global or local behavior of a flexible body due to a specified loading condition. This paper proposes a technique to generate the static correction modes which are nicely representing a motion by a contact force between a piston and cylinder. First normal modes of piston and cylinder under a boundary condition are computed, and then static correction modes due to a contact force applied at contacted nodes are added to the normal modes. Also, this paper proposes an efficient dynamics analysis process while changing the shape of the piston and cylinder. In optimization process or design study, their geometric data can be changed a bit. The slight changes of their contact surfaces make a high variation of the magnitude of a contact force, and it can yield the different dynamic behavior of an engine system. But, since the variations of the normal and correction modes are very small, the re-computation of their normal and correction modes due to the change of contact surfaces can be useless. Until now, whenever their contact surfaces are changed at a design cycle, the modes have been recomputed. Thus, most engineers in industries have been spent many times in very tedious and inefficient design process. In this paper, the normal and correction modes from the basic geometry of the piston and cylinder are computed. If the geometry shape is changed, nodal positions of the original modal model are newly calculated from an interpolation method and changed geometry data. And then the updated nodes are used to compute a precise contact force. The proposed methods illustrated in this investigation have good agreement with results of a nodal synthesis technique and proved that it is very efficient design method.

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Alternating Stress Dynamics Analysis of Harmonic Gear Flexible Wheel

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.546-547.102 ◽

2012 ◽

Vol 546-547 ◽

pp. 102-109

Author(s):

Xue Feng Han ◽

Yang Bai ◽

Ming Li ◽

Hong Guang Jia

Keyword(s):

Synthesis Method ◽

Drive System ◽

Dynamics Simulation ◽

Theoretical Simulation ◽

Gear Drive ◽

Modal Synthesis ◽

Change Trend ◽

Simulation Results ◽

To Come ◽

Stress Simulation

This article is the study of alternating stress of flexible wheel in harmonic gear drive system. Firstly, according to elasticity theory to theoretically analyze flexible wheel stress; then, based on the basic principle of sub-structure modal synthesis method , use the software of UG、PATRAN and ADAMS to carry out co-simulation; Finally, based on the dynamics simulation, to analyze the alternating stress simulation results of flexible wheel and compare theoretical results and simulation results to come conclusion. The results show that: altering stress simulation results of flexible wheel are coincident with theoretical simulation results, have a deeper understand the stress change trend in the drive process of flexible wheel, lay a foundation for further carrying out dynamics simulation of harmonic gear drive system.

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