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Alternate-continuous-control systems with double-impulse [PDF]

Advances in Difference Equations, 2017
We propose a mathematical model that can control the stability of an unstable system. Periodicity is an important feature of the system. We add a continuous control to the first half of each period of the system and then add an impulse control J1 at the ...
Xiang Hu, Hongjuan Wu, Yuming Feng, Jiang Xiong   +3 more
doaj   +8 more sources

Critical response of 2DOF elastic-plastic building structures under double impulse as substitute of near-fault ground motion

Frontiers in Built Environment, 2016
The double impulse is introduced as a substitute of the fling-step near-fault ground motion and a critical elastic-plastic response of a 2DOF (two-degree-of-freedom) building structure under the ‘critical double impulse’ is evaluated.
Ryo eTaniguchi, Kotaro eKojima, Izuru eTakewaki   +2 more
doaj   +3 more sources

Bounding of earthquake response via critical double impulse for efficient optimal design of viscous dampers for elastic‐plastic moment frames

Japan Architectural Review, 2022
An input velocity adjustment method of the critical double impulse (DI) is presented for efficient design of viscous dampers for elastic‐plastic moment frames.
Hiroki Akehashi, Izuru Takewaki
doaj   +2 more sources

Simultaneous Optimization of Elastic-Plastic Building Structures and Viscous Dampers Under Critical Double Impulse

Frontiers in Built Environment, 2020
A new method for simultaneous optimal design of main building structures and viscous dampers is proposed for elastic-plastic multi-degree-of-freedom (MDOF) building structures subjected to the critical double impulse which is regarded as a representative
Hiroki Akehashi, Izuru Takewaki
doaj   +3 more sources

Robust Optimal Damper Placement of Nonlinear Oil Dampers With Uncertainty Using Critical Double Impulse

Frontiers in Built Environment, 2021
A new robust method for optimal damper placement is presented for building structures under the critical double impulse. Oil dampers are treated here as representative supplemental dampers to control the seismic response of high-rise buildings.
Kohei Fujita, Ryota Wataya, Izuru Takewaki   +2 more
doaj   +3 more sources

Collapse-Limit Input Level of Critical Double Impulse for Damped Bilinear Hysteretic SDOF System With Negative Post-yield Stiffness

Frontiers in Built Environment, 2019
The collapse-limit input velocity level of the critical double impulse simulating the principal part of near-fault ground motions is derived for an elastic-plastic structure with viscous damping and P-delta effect.
Yoshito Saotome, Kotaro Kojima, Izuru Takewaki   +2 more
doaj   +3 more sources

Critical double impulse input and bound of earthquake input energy to building structure

Frontiers in Built Environment, 2015
A theory of earthquake input energy to building structures under single impulse is useful for disclosing the property of energy transfer function. This property shows that the area of the energy transfer function is constant irrespective of natural ...
Kotaro eKojima, Kohei eFujita, Izuru eTakewaki   +2 more
doaj   +3 more sources

The Sequence (S) index as a marker of diminished step-to-step transition efficiency in older adults [PDF]

Frontiers in Human Neuroscience
IntroductionAge-related declines in walking efficiency are often attributed to musculoskeletal and neuromuscular changes, yet the mechanisms underlying these inefficiencies remain poorly understood.
Elham Alijanpour, Ashwini Kulkarni, Peter G. Adamczyk, Daniel M. Russell   +3 more
doaj   +2 more sources

General Dynamic Collapse Criterion for Elastic–Plastic Structures Under Double Impulse as Substitute of Near-Fault Ground Motion

Frontiers in Built Environment, 2020
A dynamic collapse criterion for elastic–plastic structures under near-fault ground motions is derived analytically by approximately transforming near-fault ground motions into double impulse and using an energy balance law.
Sae Homma, Kotaro Kojima, Izuru Takewaki
doaj   +3 more sources

Critical earthquake response of a SDOF elastic‐perfectly plastic model with viscous damping under double impulse as a substitute for near‐fault ground motion

Japan Architectural Review, 2018
The double‐impulse input is introduced as a substitute for the fling‐step near‐fault ground motion, and a closed‐form solution for the approximate elastic‐plastic response of a structure with viscous damping under the “critical double impulse” is derived.
Kotaro Kojima, Yoshito Saotome, Izuru Takewaki   +2 more
doaj   +2 more sources