The Experts below are selected from a list of 229995 Experts worldwide ranked by ideXlab platform
Xuan Chen - One of the best experts on this subject based on the ideXlab platform.
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A novel metamaterial with tension-torsion Coupling Effect
Materials & Design, 2019Co-Authors: Bin-bin Zheng, Rongchang Zhong, Xuan ChenAbstract:Abstract A novel 3D metamaterial with tension-torsion Coupling Effect is designed through connecting neighbor chiral honeycomb layers by inclined rods. Both numerical simulation and experiment analysis show the tension-torsion Coupling Effect of the metamaterial is much better compared to other metamaterials we can find in literatures. With the increase of cells number, the tension-torsion Coupling Effect of this metamaterial at the strain of 1% increases firstly, reaching the perk value of 11.36°, then decreases slowly, and it remains an appreciable value of 4.44° even when the cells number is 25 × 25 × 25. Analysis shows that size Effect in the thickness direction can be neglected when the layers number is more than 5. The stress and deformation of struts within the metamaterial are investigated. For the inclined rods and the square loops, their main deformation is the axial deformation while the main deformation of ligaments is out-of-plane bending deformation. According to the deformation law of inclined rods, it can be concluded that when the compression strain increases, the inclined rods lying in the layer's center enter the instability state first and then instability zone expands outwards, resulting in instability state of the metamaterial.
Bin-bin Zheng - One of the best experts on this subject based on the ideXlab platform.
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A novel metamaterial with tension-torsion Coupling Effect
Materials & Design, 2019Co-Authors: Bin-bin Zheng, Rongchang Zhong, Xuan ChenAbstract:Abstract A novel 3D metamaterial with tension-torsion Coupling Effect is designed through connecting neighbor chiral honeycomb layers by inclined rods. Both numerical simulation and experiment analysis show the tension-torsion Coupling Effect of the metamaterial is much better compared to other metamaterials we can find in literatures. With the increase of cells number, the tension-torsion Coupling Effect of this metamaterial at the strain of 1% increases firstly, reaching the perk value of 11.36°, then decreases slowly, and it remains an appreciable value of 4.44° even when the cells number is 25 × 25 × 25. Analysis shows that size Effect in the thickness direction can be neglected when the layers number is more than 5. The stress and deformation of struts within the metamaterial are investigated. For the inclined rods and the square loops, their main deformation is the axial deformation while the main deformation of ligaments is out-of-plane bending deformation. According to the deformation law of inclined rods, it can be concluded that when the compression strain increases, the inclined rods lying in the layer's center enter the instability state first and then instability zone expands outwards, resulting in instability state of the metamaterial.
Rongchang Zhong - One of the best experts on this subject based on the ideXlab platform.
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A novel metamaterial with tension-torsion Coupling Effect
Materials & Design, 2019Co-Authors: Bin-bin Zheng, Rongchang Zhong, Xuan ChenAbstract:Abstract A novel 3D metamaterial with tension-torsion Coupling Effect is designed through connecting neighbor chiral honeycomb layers by inclined rods. Both numerical simulation and experiment analysis show the tension-torsion Coupling Effect of the metamaterial is much better compared to other metamaterials we can find in literatures. With the increase of cells number, the tension-torsion Coupling Effect of this metamaterial at the strain of 1% increases firstly, reaching the perk value of 11.36°, then decreases slowly, and it remains an appreciable value of 4.44° even when the cells number is 25 × 25 × 25. Analysis shows that size Effect in the thickness direction can be neglected when the layers number is more than 5. The stress and deformation of struts within the metamaterial are investigated. For the inclined rods and the square loops, their main deformation is the axial deformation while the main deformation of ligaments is out-of-plane bending deformation. According to the deformation law of inclined rods, it can be concluded that when the compression strain increases, the inclined rods lying in the layer's center enter the instability state first and then instability zone expands outwards, resulting in instability state of the metamaterial.
Jun Zhou - One of the best experts on this subject based on the ideXlab platform.
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Performance-Involved Coupling Effect-Triggered Scheme for Robust Attitude Control of HRV
IEEE ASME Transactions on Mechatronics, 2020Co-Authors: Zongyi Guo, Jianguo Guo, Bin Zhao, Jun ZhouAbstract:This article investigates the relationship between the tracking performance and Coupling Effect for attitude tracking issue of hypersonic reentry vehicle (HRV), and proposes a performance-involved Coupling Effect-triggered robust control scheme. The main feature of the article lies in that the influence of the Coupling Effect on the performance is discussed via a defined performance-involved Coupling Effect indicator. Consequently, the proposed control ensures the transient performance within the prescribed limitation in all phases, and the better transient performance is achieved with the help of the sliding mode control and disturbance observer technique enhancing the robustness. Comparison simulations and Monte Carlo tests under coefficients perturbation on the HRV system demonstrate the Effectiveness of the proposed control strategy.
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Coupling Effect-triggered control strategy for hypersonic flight vehicles with finite-time convergence
Nonlinear Dynamics, 2018Co-Authors: Zongyi Guo, Jianguo Guo, Jing Chang, Jun ZhouAbstract:This paper investigates a novel control strategy of addressing Coupling issue for attitude tracking control of hypersonic flight vehicle. By using a defined Coupling Effect indicator which demonstrates whether a Coupling harms or benefits the system, one finite-time Coupling Effect-triggered control scheme is proposed via applying the second-order sliding mode control technique. A specific nonlinear function is designed to implement the addition of beneficial Couplings or removal of detrimental Couplings. As a consequence, the proposed method establishes a unified Couplings recognition and Coupling Effect-triggered control framework, which leads to a potential of improving the dynamic performance. The chattering attenuation is also involved for practical implementation. Finally, simulation results illustrate the validity of the proposed control scheme.
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adaptive attitude tracking control for hypersonic reentry vehicles via sliding mode based Coupling Effect triggered approach
Aerospace Science and Technology, 2018Co-Authors: Zongyi Guo, Jianguo Guo, Jun ZhouAbstract:Abstract This paper proposed a Coupling Effect-triggered control approach for hypersonic reentry vehicles attitude tracking system based on the adaptive sliding mode techniques. A Coupling Effect indicator (CEI), which is established based on the Lyapunov stability theory, is obtained to demonstrate whether a Coupling harms or benefits the system. In consequence, the Coupling Effect-triggered control driven by the CEI is developed to cancel the harmful Couplings while keeping the beneficial Couplings. Meanwhile, the robustness of the proposed method is enhanced by the adaptive sliding mode approach even when the boundary of the disturbance is unknown. To avoid the non-differentiable terms in the controller design, the command filtered scheme is introduced and the bounded stability of the closed-loop system is guaranteed. This technique outperforms the existing controllers which do not consider the Coupling Effect in the transient response. Finally, application to the hypersonic vehicle system is presented to demonstrate the validity of the proposed control scheme.
Zongyi Guo - One of the best experts on this subject based on the ideXlab platform.
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Performance-Involved Coupling Effect-Triggered Scheme for Robust Attitude Control of HRV
IEEE ASME Transactions on Mechatronics, 2020Co-Authors: Zongyi Guo, Jianguo Guo, Bin Zhao, Jun ZhouAbstract:This article investigates the relationship between the tracking performance and Coupling Effect for attitude tracking issue of hypersonic reentry vehicle (HRV), and proposes a performance-involved Coupling Effect-triggered robust control scheme. The main feature of the article lies in that the influence of the Coupling Effect on the performance is discussed via a defined performance-involved Coupling Effect indicator. Consequently, the proposed control ensures the transient performance within the prescribed limitation in all phases, and the better transient performance is achieved with the help of the sliding mode control and disturbance observer technique enhancing the robustness. Comparison simulations and Monte Carlo tests under coefficients perturbation on the HRV system demonstrate the Effectiveness of the proposed control strategy.
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Coupling Effect-triggered control strategy for hypersonic flight vehicles with finite-time convergence
Nonlinear Dynamics, 2018Co-Authors: Zongyi Guo, Jianguo Guo, Jing Chang, Jun ZhouAbstract:This paper investigates a novel control strategy of addressing Coupling issue for attitude tracking control of hypersonic flight vehicle. By using a defined Coupling Effect indicator which demonstrates whether a Coupling harms or benefits the system, one finite-time Coupling Effect-triggered control scheme is proposed via applying the second-order sliding mode control technique. A specific nonlinear function is designed to implement the addition of beneficial Couplings or removal of detrimental Couplings. As a consequence, the proposed method establishes a unified Couplings recognition and Coupling Effect-triggered control framework, which leads to a potential of improving the dynamic performance. The chattering attenuation is also involved for practical implementation. Finally, simulation results illustrate the validity of the proposed control scheme.
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adaptive attitude tracking control for hypersonic reentry vehicles via sliding mode based Coupling Effect triggered approach
Aerospace Science and Technology, 2018Co-Authors: Zongyi Guo, Jianguo Guo, Jun ZhouAbstract:Abstract This paper proposed a Coupling Effect-triggered control approach for hypersonic reentry vehicles attitude tracking system based on the adaptive sliding mode techniques. A Coupling Effect indicator (CEI), which is established based on the Lyapunov stability theory, is obtained to demonstrate whether a Coupling harms or benefits the system. In consequence, the Coupling Effect-triggered control driven by the CEI is developed to cancel the harmful Couplings while keeping the beneficial Couplings. Meanwhile, the robustness of the proposed method is enhanced by the adaptive sliding mode approach even when the boundary of the disturbance is unknown. To avoid the non-differentiable terms in the controller design, the command filtered scheme is introduced and the bounded stability of the closed-loop system is guaranteed. This technique outperforms the existing controllers which do not consider the Coupling Effect in the transient response. Finally, application to the hypersonic vehicle system is presented to demonstrate the validity of the proposed control scheme.
