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Local connection stiffness identification for nonlinear structural systems
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Yan-song REN1, 2, Zhi-sai MA1, 2, Ya-nan LI3, Jia-hui YU3, Zhong ZHANG3, Qian DING1, 2
Journal of Vibration Engineering | 2024, 37(10) : 1698 - 1706
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Journal of Vibration Engineering | 2024, 37(10): 1698-1706
Local connection stiffness identification for nonlinear structural systems
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Yan-song REN1, 2, Zhi-sai MA1, 2, Ya-nan LI3, Jia-hui YU3, Zhong ZHANG3, Qian DING1, 2
Affiliations
  • 1School of Mechanical Engineering, Tianjin University, Tianjin 300350, China
  • 2Tianjin Key Laboratory of Nonlinear Dynamics and Control, Tianjin 300350, China
  • 3Beijing Institute of Structure and Environment Engineering, Beijing 100076, China
Published: 2024-10-28 doi: 10.16385/j.cnki.issn.1004-4523.2024.10.007
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Jointed structures are widely used in engineering applications，and local nonlinear characteristics at the connection interface have an important influence on their dynamic modeling and characteristic prediction. Aiming at the problem that local connection parameters of nonlinear structural systems are unknown or difficult to measure，this paper proposes an identification method of local linear connection stiffness based on the FRF transformation from the perspective of inverse dynamic problems. By further combining with the time-domain nonlinear subspace identification method，the local linear and nonlinear connection stiffness of nonlinear structural systems can be finally obtained. The numerical example and experimental setup of the three degrees-of-freedom structural system are designed and further built to validate the proposed method. The results demonstrate that the proposed method can separate and identify the underlying linear FRF and nonlinear parameters of the nonlinear structural system，and subsequently realize the joint identification of the local linear and nonlinear connection stiffness.

connection stiffness identification  /  jointed structure  /  nonlinear system  /  nonlinear subspace identification method
Yan-song REN, Zhi-sai MA, Ya-nan LI, Jia-hui YU, Zhong ZHANG, Qian DING. Local connection stiffness identification for nonlinear structural systems[J]. Journal of Vibration Engineering, 2024 , 37 (10) : 1698 -1706 . DOI: 10.16385/j.cnki.issn.1004-4523.2024.10.007
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Year 2024 volume 37 Issue 10
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Article Info
doi: 10.16385/j.cnki.issn.1004-4523.2024.10.007
  • Receive Date：2024-03-14
  • Online Date：2026-02-12
  • Published：2024-10-28
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  • Received：2024-03-14
  • Revised：2024-04-08
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Affiliations
    1School of Mechanical Engineering, Tianjin University, Tianjin 300350, China
    2Tianjin Key Laboratory of Nonlinear Dynamics and Control, Tianjin 300350, China
    3Beijing Institute of Structure and Environment Engineering, Beijing 100076, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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