A Direct Eigenanalysis of Multibody System in Equilibrium
This paper presents a direct eigenanalysis procedure for multibody system in equilibrium. The first kind Lagrange’s equation of the dynamics of multibody system is a set of differential algebraic equations, and the equations can be used to solve the equilibrium of the system. The vibration of the sy...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2012-01-01
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| Series: | Journal of Applied Mathematics |
| Online Access: | http://dx.doi.org/10.1155/2012/638546 |
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| author | Cheng Yang Dazhi Cao Zhihua Zhao Zhengru Zhang Gexue Ren |
| author_facet | Cheng Yang Dazhi Cao Zhihua Zhao Zhengru Zhang Gexue Ren |
| author_sort | Cheng Yang |
| collection | DOAJ |
| description | This paper presents a direct eigenanalysis procedure for multibody system in equilibrium. The first kind Lagrange’s equation of the dynamics of multibody system is a set of differential algebraic equations, and the equations can be used to solve the equilibrium of the system. The vibration of the system about the equilibrium can be described by the linearization of the governing equation with the generalized coordinates and the multipliers as the perturbed variables. But the multiplier variables and the generalize coordinates are not in the same dimension. As a result, the system matrices in the perturbed vibration equations are badly conditioned, and a direct application of the mature eigensolvers does not guarantee a correct solution to the corresponding eigenvalue problem. This paper discusses the condition number of the problem and proposes a method for preconditioning the system matrices, then the corresponding eigenvalue problem of the multibody system about equilibrium can be smoothly solved with standard eigensolver such as ARPACK. In addition, a necessary frequency shift technology is also presented in the paper. The importance of matrix conditioning and the effectiveness of the presented method for preconditioning are demonstrated with numerical examples. |
| format | Article |
| id | doaj-art-9ca1abdca97a4d549bcf6e853c6ea1c3 |
| institution | Kabale University |
| issn | 1110-757X 1687-0042 |
| language | English |
| publishDate | 2012-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Journal of Applied Mathematics |
| spelling | doaj-art-9ca1abdca97a4d549bcf6e853c6ea1c32025-02-03T06:44:44ZengWileyJournal of Applied Mathematics1110-757X1687-00422012-01-01201210.1155/2012/638546638546A Direct Eigenanalysis of Multibody System in EquilibriumCheng Yang0Dazhi Cao1Zhihua Zhao2Zhengru Zhang3Gexue Ren4School of Mathematical Sciences, Beijing Normal University, Beijing 100875, ChinaSchool of Aerospace, Tsinghua University, Beijing 100084, ChinaSchool of Aerospace, Tsinghua University, Beijing 100084, ChinaSchool of Mathematical Sciences, Beijing Normal University, Beijing 100875, ChinaSchool of Aerospace, Tsinghua University, Beijing 100084, ChinaThis paper presents a direct eigenanalysis procedure for multibody system in equilibrium. The first kind Lagrange’s equation of the dynamics of multibody system is a set of differential algebraic equations, and the equations can be used to solve the equilibrium of the system. The vibration of the system about the equilibrium can be described by the linearization of the governing equation with the generalized coordinates and the multipliers as the perturbed variables. But the multiplier variables and the generalize coordinates are not in the same dimension. As a result, the system matrices in the perturbed vibration equations are badly conditioned, and a direct application of the mature eigensolvers does not guarantee a correct solution to the corresponding eigenvalue problem. This paper discusses the condition number of the problem and proposes a method for preconditioning the system matrices, then the corresponding eigenvalue problem of the multibody system about equilibrium can be smoothly solved with standard eigensolver such as ARPACK. In addition, a necessary frequency shift technology is also presented in the paper. The importance of matrix conditioning and the effectiveness of the presented method for preconditioning are demonstrated with numerical examples.http://dx.doi.org/10.1155/2012/638546 |
| spellingShingle | Cheng Yang Dazhi Cao Zhihua Zhao Zhengru Zhang Gexue Ren A Direct Eigenanalysis of Multibody System in Equilibrium Journal of Applied Mathematics |
| title | A Direct Eigenanalysis of Multibody System in Equilibrium |
| title_full | A Direct Eigenanalysis of Multibody System in Equilibrium |
| title_fullStr | A Direct Eigenanalysis of Multibody System in Equilibrium |
| title_full_unstemmed | A Direct Eigenanalysis of Multibody System in Equilibrium |
| title_short | A Direct Eigenanalysis of Multibody System in Equilibrium |
| title_sort | direct eigenanalysis of multibody system in equilibrium |
| url | http://dx.doi.org/10.1155/2012/638546 |
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