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Isolation performance evaluation of base-isolated system with active nonlinear negative stiffness devices
https://orcid.org/0000-0002-5353-4271
Abstract This paper introduces a control method utilizing an active nonlinear negative stiffness device (ANNSD) to mitigate excessive displacement of isolation layers in base-isolated structures (BIS). The proposed approach, based on linear quadratic regulation (LQR), effectively controls the displacement of the isolation layers and enhances the seismic performance of the structure. To address the nonlinear characteristics inherent in the forward model of the negative stiffness device, a novel active nonlinear negative stiffness device model is introduced, allowing for the adjustment of the spring expansion ratio. The inverse model of the nonlinear negative stiffness device is predicted and fitted using an LSTM neural network, enabling real-time determination of the input spring expansion ratio based on the desired control force and system response. The feasibility and effectiveness of the proposed method are validated through numerical simulations on a two-degree-of-freedom BIS equipped with the ANNSD. A comparative analysis is conducted between the base-isolated structure with active nonlinear negative stiffness device (BIS-ANNSD) system and the uncontrolled system. The results demonstrate the favorable application advantages of using LSTM for the prediction and fitting of the inverse model of the nonlinear device. The ANNSD effectively mitigates excessive displacement of the isolation layer, while the integration of the LQR controller ensures effective suppression of acceleration responses in the superstructure.
Highlights An inverse model of a nonlinear negative stiffness device is developed using LSTM for prediction and fitting. An active nonlinear negative stiffness device is proposed, based on altering the spring expansion ratio. The effectiveness of an active nonlinear negative stiffness control method based on LQR is verified. The superior seismic isolation performance of an ANNSD applies to a BIS is showed through numerical simulations.
Isolation performance evaluation of base-isolated system with active nonlinear negative stiffness devices
https://orcid.org/0000-0002-5353-4271
Abstract This paper introduces a control method utilizing an active nonlinear negative stiffness device (ANNSD) to mitigate excessive displacement of isolation layers in base-isolated structures (BIS). The proposed approach, based on linear quadratic regulation (LQR), effectively controls the displacement of the isolation layers and enhances the seismic performance of the structure. To address the nonlinear characteristics inherent in the forward model of the negative stiffness device, a novel active nonlinear negative stiffness device model is introduced, allowing for the adjustment of the spring expansion ratio. The inverse model of the nonlinear negative stiffness device is predicted and fitted using an LSTM neural network, enabling real-time determination of the input spring expansion ratio based on the desired control force and system response. The feasibility and effectiveness of the proposed method are validated through numerical simulations on a two-degree-of-freedom BIS equipped with the ANNSD. A comparative analysis is conducted between the base-isolated structure with active nonlinear negative stiffness device (BIS-ANNSD) system and the uncontrolled system. The results demonstrate the favorable application advantages of using LSTM for the prediction and fitting of the inverse model of the nonlinear device. The ANNSD effectively mitigates excessive displacement of the isolation layer, while the integration of the LQR controller ensures effective suppression of acceleration responses in the superstructure.
Highlights An inverse model of a nonlinear negative stiffness device is developed using LSTM for prediction and fitting. An active nonlinear negative stiffness device is proposed, based on altering the spring expansion ratio. The effectiveness of an active nonlinear negative stiffness control method based on LQR is verified. The superior seismic isolation performance of an ANNSD applies to a BIS is showed through numerical simulations.
Isolation performance evaluation of base-isolated system with active nonlinear negative stiffness devices
https://orcid.org/0000-0002-5353-4271
Abstract This paper introduces a control method utilizing an active nonlinear negative stiffness device (ANNSD) to mitigate excessive displacement of isolation layers in base-isolated structures (BIS). The proposed approach, based on linear quadratic regulation (LQR), effectively controls the displacement of the isolation layers and enhances the seismic performance of the structure. To address the nonlinear characteristics inherent in the forward model of the negative stiffness device, a novel active nonlinear negative stiffness device model is introduced, allowing for the adjustment of the spring expansion ratio. The inverse model of the nonlinear negative stiffness device is predicted and fitted using an LSTM neural network, enabling real-time determination of the input spring expansion ratio based on the desired control force and system response. The feasibility and effectiveness of the proposed method are validated through numerical simulations on a two-degree-of-freedom BIS equipped with the ANNSD. A comparative analysis is conducted between the base-isolated structure with active nonlinear negative stiffness device (BIS-ANNSD) system and the uncontrolled system. The results demonstrate the favorable application advantages of using LSTM for the prediction and fitting of the inverse model of the nonlinear device. The ANNSD effectively mitigates excessive displacement of the isolation layer, while the integration of the LQR controller ensures effective suppression of acceleration responses in the superstructure.
Highlights An inverse model of a nonlinear negative stiffness device is developed using LSTM for prediction and fitting. An active nonlinear negative stiffness device is proposed, based on altering the spring expansion ratio. The effectiveness of an active nonlinear negative stiffness control method based on LQR is verified. The superior seismic isolation performance of an ANNSD applies to a BIS is showed through numerical simulations.
Isolation performance evaluation of base-isolated system with active nonlinear negative stiffness devices
Zhang, Yafei (author) / Hu, Yuchen (author) / Li, Ning (author) / Xie, Lili (author) / Wang, Zhe (author) / Liu, Dewen (author)
2024-02-24
Article (Journal)
Electronic Resource
English
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