Random crowd-induced vibration in footbridge and adaptive control using semi-active TMD including crowd-structure interaction

Engineering Structures, Journal Year: 2024, Volume and Issue: 306, P. 117839 - 117839

Published: March 14, 2024

Language: Английский

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Deep reinforcement learning and robust SLAM based robotic control algorithm for self-driving path optimization

Frontiers in Neurorobotics, Journal Year: 2025, Volume and Issue: 18

Published: Jan. 15, 2025

A reward shaping deep deterministic policy gradient (RS-DDPG) and simultaneous localization mapping (SLAM) path tracking algorithm is proposed to address the issues of low accuracy poor robustness target for robotic control during maneuver. RS-DDPG based on reinforcement learning (DRL) designs a function optimize parameters DDPG achieve required stability. visual SLAM semantic segmentation geometric information susceptibility interference from dynamic objects in scenes sensors. Using Apollo autonomous driving simulation platform, experiments were conducted actual improved path-tracking algorithm. The research results indicate that outperforms terms robustness. showed it effectively performance systems scenarios.

Language: Английский

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Use of recycled aggregate concrete in structural members: a review focused on Southeast Asia

Journal of Asian Architecture and Building Engineering, Journal Year: 2023, Volume and Issue: unknown, P. 1 - 24

Published: Oct. 13, 2023

This article presents a comprehensive review on the use of recycled concrete aggregate (RCA) and (RAC) in construction, with emphasis structural applications identification challenges opportunities RCA/RAC materials Southeast Asia. For first time as step towards potential standardization Asia, critically examines physical mechanical performance RCA RAC applications. Global demand is projected to surpass 50 billion tons by 2025, major Asian countries accounting for 62% consumption. At same time, global annual production construction demolition waste (C&DW) exceeds 3.57 tons, Asia responsible 53% this total. Recycling C&DW plays crucial role addressing environmental issues promoting sustainable practices. Previous research indicates that exhibits certain deficiencies, strengths 10% 20% lower than natural (NAC). level, elements show reductions up 15% axial, bonding, shear, flexural relative NAC. Measures such treatment RCA, recycling process optimization, optimized mixing techniques are recommended enhance properties. Prioritizing during exploring novel strengthening could elevate improve make it suitable The also found efforts vary significantly across (particularly Asia), some lagging regarding technologies best Various strategies proposed discussed. main findings shortcomings previous investigations discussed, further needs identified.

Language: Английский

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A role of integrated microheaters in a microfluidics based point-of-care-testing and beyond for healthcare applications

Applied Materials Today, Journal Year: 2024, Volume and Issue: 38, P. 102225 - 102225

Published: May 10, 2024

Language: Английский

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The impact of the frequency content of far-field earthquakes on the optimum parameters and performance of tuned mass damper inerter

Structures, Journal Year: 2024, Volume and Issue: 60, P. 105925 - 105925

Published: Jan. 23, 2024

Tuned mass damper inerter is a passive control device that proven to be effective in mitigating structural responses under earthquake excitations, however, its efficiency highly depends on design parameters. This paper aims investigate how the optimum parameters of TMDI change with frequency content far-field earthquakes minimize need for repeatedly optimizing these varying and characteristics. To achieve this objective, ratio earthquake's structure's defined as an index simultaneously represent structure earthquake. Case studies 5, 10, 15, 20-story building structures are analyzed twenty-three which categorized into three main groups based their (PGA/PGV) including “Low”, “Intermediate”, “High”. Particle Swarm Optimization (PSO) employed obtain damping two distinct objective functions: (1) peak displacement (2) acceleration top story time domain analysis. validate applicability proposed method determining optimal regardless frequency, 10-story benchmark employed. Moreover, study demonstrates effectiveness minimizing functions concerning It also illustrates trend PSO optimization process. The results show provides discernible pattern variation TMDI. Furthermore, it demonstrated difference response between tuning algorithm suggested less than 3 % when greater 1. As increases, will correspondingly increase. indicate that, increment inertance leads increase value among all analyzed, those subjected intermediate exhibit most significant reduction both functions.

Language: Английский

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Vulnerability assessment of tall isolated steel building under variable earthquake hazard levels using endurance time method

Journal of Structural Integrity and Maintenance, Journal Year: 2024, Volume and Issue: 9(1)

Published: Jan. 2, 2024

In this research, the superstructure behavior in isolated structures has been studied based on their ductility. For purpose, three tall by triple friction pendulum isolators (TFPI) have designed. The ductility of superstructures is different due to seismic force-resisting systems. performance evaluated endurance time (ET) method. This method significantly reduces nonlinear dynamic analysis optimizing number desired earthquake records one excitation functions (ETEFs). Additionally, response under hazard levels can be achieved Results show that change ratio isolator period (TI/TS) affect floor acceleration, TFPI displacement and interstory drift (IDR). However, IDR are also sensitive type system, whether it a braced frame or moment frame. Moreover, there possibility entering collapse phase structural components with which designed linear static spectral methods, an return equal level considered design step.

Language: Английский

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Optimization of control forces in a three-dimensional frame with magnetorheological dampers using a hybrid algorithm

Journal of Building Engineering, Journal Year: 2025, Volume and Issue: 100, P. 111697 - 111697

Published: Jan. 5, 2025

Language: Английский

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Root-Locus Optimal Formula for Seismic Control of Multi-Story Structures Equipped with Tuned Mass Damper Inerter Enhanced by Negative Stiffness Considering Non-resonant Mode Contributions

Journal of Building Engineering, Journal Year: 2025, Volume and Issue: unknown, P. 112203 - 112203

Published: Feb. 1, 2025

Language: Английский

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Active tuned mass damper inerter with optimized fuzzy logic controller for structural seismic vibration mitigation

Soil Dynamics and Earthquake Engineering, Journal Year: 2025, Volume and Issue: 194, P. 109353 - 109353

Published: March 4, 2025

Language: Английский

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Optimal Control Based on Reinforcement Learning for Flexible High-Rise Buildings with Time-Varying Actuator Failures and Asymmetric State Constraints

Buildings, Journal Year: 2025, Volume and Issue: 15(6), P. 841 - 841

Published: March 7, 2025

This study centers on the vibration suppression of high-rise building systems under extreme conditions, exploring a reinforcement learning (RL)-based control strategy for flexible with time-varying faults and asymmetric state constraints. A mathematical model precisely depicting dynamic characteristics buildings, considering nature actuator faults, is initially established. Subsequently, learning-based controller devised to counteract negative impacts system performance. By introducing Lyapunov function, constraints are ensured, safeguarding stability security. The closed-loop rigorously proven using theory, guaranteeing stable performance even in presence faults. simulation results indicate that proposed method can effectively reduce response buildings when facing demonstrates its remarkable robustness adaptability, presenting novel effective solution real-world buildings.

Language: Английский

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