Structural Engineering and Mechanics

  • 제87권4호
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  • Pages.363-373
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  • 2023
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  • 1225-4568(pISSN)
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  • 1598-6217(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

A stability factor for structure-dependent time integration methods

  • 투고 : 2021.03.24
  • 심사 : 2023.07.18
  • 발행 : 2023.08.25
⟨ 이전 논문 다음 논문 ⟩

초록

Since the first family of structure-dependent methods can simultaneously integrate unconditional stability and explicit formulation in addition to second order accuracy, it is very computationally efficient for solving inertial problems except for adopting auto time-stepping techniques due to no nonlinear iterations. However, an unusual stability property is first found herein since its unconditional stability interval is drastically different for zero and nonzero damping. In fact, instability might occur for solving a damped stiffness hardening system while an accurate result can be obtained for the corresponding undamped stiffness hardening system. A technique of using a stability factor is applied to overcome this difficulty. It can be applied to magnify an unconditional stability interval. After introducing this stability factor, the formulation of this family of structure-dependent methods is changed accordingly and thus its numerical properties must be re-evaluated. In summary, a large stability factor can result in a large unconditional stability interval but also lead to a large relative period error. As a consequence, a stability factor must be appropriately chosen to have a desired unconditional stability interval in addition to an acceptable period distortion.

키워드

과제정보

The author is grateful to acknowledge that this study is financially supported by the Ministry of Science and Technology, Taiwan, R.O.C., under Grant No. MOST-109-2221-E-027-002.

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