Investigation of fracture process zone development in quasi-isotropic carbon/epoxy laminates using in situ and ex situ x-ray computed tomography (2023)
Journal Article
Xu, X., Takeda, S., & Wisnom, M. R. (2023). Investigation of fracture process zone development in quasi-isotropic carbon/epoxy laminates using in situ and ex situ x-ray computed tomography. Composites Part A: Applied Science and Manufacturing, 107395

Trans-laminar fracture toughness is an important property of laminated composites and examining the fracture process zone at the tip of a crack is key to understanding it. To date, little research has been done on in-depth examination of the early fr... Read More about Investigation of fracture process zone development in quasi-isotropic carbon/epoxy laminates using in situ and ex situ x-ray computed tomography.

Multifunctional concrete with Graphene-based nanomaterials and super absorbent polymer (2023)
Journal Article
Qureshi, T., & Ootim, S. (2023). Multifunctional concrete with Graphene-based nanomaterials and super absorbent polymer. Journal of Materials in Civil Engineering, 35(4), https://doi.org/10.1061/%28ASCE%29MT.1943-5533.0004699

This study reports on the development of a multifunctional concrete using graphene nanoplatelet (GnP) and sodium polyacrylate (SP) superabsorbent polymer. A combination of concrete functionalities was convened to improve, i.e., high strength and dura... Read More about Multifunctional concrete with Graphene-based nanomaterials and super absorbent polymer.

Compressive behaviour of a square origami surface-based lattice structure fabricated by selective laser melting (2023)
Conference Proceeding
Gao, J., Han, Q., Soe, S., Liu, Z., Feng, J., Zhang, Z., & Wang, L. (2023). Compressive behaviour of a square origami surface-based lattice structure fabricated by selective laser melting. In R. J. Howlett, S. G. Scholz, & R. Setchi (Eds.), SDM 2022: Sustainable Design and Manufacturing (57-66). https://doi.org/10.1007/978-981-19-9205-6_6

Selective laser melting (SLM) is a metal additive manufacturing process that shows significant advantages in manufacturing lattice structures. In this paper, a novel surface-based square origami structure made of a nickel-based superalloy was fabrica... Read More about Compressive behaviour of a square origami surface-based lattice structure fabricated by selective laser melting.

Developing test methods for compression after lightning strikes (2022)
Journal Article
Xu, X., Millen, S. L. J., Lee, J., Abdelal, G., Mitchard, D., Wisnom, M. R., & Murphy, A. (in press). Developing test methods for compression after lightning strikes. Applied Composite Materials,

Research into residual strength after lightning strike is increasing within the literature. However, standard test methods for measuring residual compressive strength after lightning strikes do not exist. For the first time, a systematic experimental... Read More about Developing test methods for compression after lightning strikes.

Improved impact damage resistance of tapered composite laminates using a ply scarfing technique (2022)
Journal Article
Gordon, T., Xu, X., Wisnom, M., Hallett, S., & Kim, B. C. (2023). Improved impact damage resistance of tapered composite laminates using a ply scarfing technique. Composites Part A: Applied Science and Manufacturing, 166, 107391. https://doi.org/10.1016/j.compositesa.2022.107391

This paper presents an experimental investigation into the effect of scarfed ply drops on the low velocity impact response of asymmetrically tapered, multi-directional, carbon/epoxy laminates, in comparison with that of conventional ply drops. Impact... Read More about Improved impact damage resistance of tapered composite laminates using a ply scarfing technique.

Digital thread: The missing link (2022)
Presentation / Conference
Zaidi, Y. (2022, December). Digital thread: The missing link. Presented at Model Driven Engineering Network (MDENet) Annual Symposium 2022, King's College London and online

An area where model-driven engineering methodologies offer the potential to accelerate digital engineering in different development phases is the connectivity of models and lifecycle activities via a digital thread. However, we need to understand how... Read More about Digital thread: The missing link.

Second-order optimization methods for time-delay Autoregressive eXogenous models: Nature gradient descent method and its two modified methods (2022)
Journal Article
Chen, J., Pu, Y., Guo, L., Cao, J., & Zhu, Q. (in press). Second-order optimization methods for time-delay Autoregressive eXogenous models: Nature gradient descent method and its two modified methods. International Journal of Adaptive Control and Signal Processing, https://doi.org/10.1002/acs.3519

This article proposes several second-order optimization methods for time-delay ARX model. Since the time-delay in the information vector makes the traditional identification algorithms be inefficient, a redundant rule based method is utilized to tran... Read More about Second-order optimization methods for time-delay Autoregressive eXogenous models: Nature gradient descent method and its two modified methods.

Numerical simulation and experimental investigation of the effect of three-layer annular coaxial shroud on gas-powder flow in laser cladding (2022)
Journal Article
Lyu, P., Jin, L., Yan, B., Zhu, L., Yao, J., & Jiang, K. (2022). Numerical simulation and experimental investigation of the effect of three-layer annular coaxial shroud on gas-powder flow in laser cladding. Journal of Manufacturing Processes, 84, 457-468. https://doi.org/10.1016/j.jmapro.2022.10.019

Laser cladding is a notable metal additive manufacturing (AM). The outstanding benefit of laser cladding is that the cladding process is more flexible and it can be completed in an open environment. However, oxidation phenomenon of active metals such... Read More about Numerical simulation and experimental investigation of the effect of three-layer annular coaxial shroud on gas-powder flow in laser cladding.

Greedy search method for separable nonlinear models using stage Aitken gradient descent and least squares algorithms (2022)
Journal Article
Chen, J., Mao, Y., Gan, M., Wang, D., & Zhu, Q. (in press). Greedy search method for separable nonlinear models using stage Aitken gradient descent and least squares algorithms. IEEE Transactions on Automatic Control, 1-8. https://doi.org/10.1109/TAC.2022.3214474

Aitken gradient descent (AGD) algorithm takes some advantages over the standard gradient descent (SGD) and Newton methods: (1) can achieve at least quadratic convergence in general; (2) does not require the Hessian matrix inversion; (3) has less comp... Read More about Greedy search method for separable nonlinear models using stage Aitken gradient descent and least squares algorithms.

U-Model-Based adaptive sliding mode control using a deep deterministic policy gradient (2022)
Journal Article
Lei, C., & Zhu, Q. (2022). U-Model-Based adaptive sliding mode control using a deep deterministic policy gradient. Mathematical Problems in Engineering, 2022, 1-14. https://doi.org/10.1155/2022/8980664

This paper presents a U-model-based adaptive sliding mode control (SMC) using a deep deterministic policy gradient (DDPG) for uncertain nonlinear systems. The configuration of the proposed methodology consisted of a U-model framework and an SMC with... Read More about U-Model-Based adaptive sliding mode control using a deep deterministic policy gradient.

Framework for developing digital twin prototypes (2022)
Conference Proceeding
Zaidi, Y., & Portapas, V. (2022). Framework for developing digital twin prototypes. In Emerging and Disruptive Modelling and Simulation Technologies to Transform Future Defence Capabilities (STO-MP-MSG-197). https://doi.org/10.14339/STO-MP-MSG-197

This paper presents an agile co-simulation framework for developing digital twin prototypes of novel flying vehicles. The framework enables rapid assessment of flying vehicles' performance and flying dynamics in the early stages of their design cycle... Read More about Framework for developing digital twin prototypes.

Modified multi-direction iterative algorithm for separable nonlinear models with missing data (2022)
Journal Article
Chen, J., Hu, M., Mao, Y., & Zhu, Q. (2022). Modified multi-direction iterative algorithm for separable nonlinear models with missing data. IEEE Signal Processing Letters, 29, 1968-1972. https://doi.org/10.1109/LSP.2022.3204408

Multi-direction iterative (MUL-DI) algorithm is an efficient algorithm for large-scale models, and it establishes a theoretical linkage between least squares (LS) and gradient descent (GD) algorithms. However, it involves Givens transformation and de... Read More about Modified multi-direction iterative algorithm for separable nonlinear models with missing data.

Identifying fibre orientations for fracture process zone characterization in scaled centre-notched quasi-isotropic carbon/epoxy laminates with a convolutional neural network (2022)
Journal Article
Xu, X., Abbas, A., & Lee, J. (2022). Identifying fibre orientations for fracture process zone characterization in scaled centre-notched quasi-isotropic carbon/epoxy laminates with a convolutional neural network. Engineering Fracture Mechanics, 274, 108768. https://doi.org/10.1016/j.engfracmech.2022.108768

This paper presents a novel X-ray Computed Tomography (CT) image analysis method to characterize the Fracture Process Zone (FPZ) in scaled centre-notched quasi-isotropic carbon/epoxy laminates. A total of 61 CT images of a small specimen were used to... Read More about Identifying fibre orientations for fracture process zone characterization in scaled centre-notched quasi-isotropic carbon/epoxy laminates with a convolutional neural network.

Hierarchical multi-innovation stochastic gradient identification algorithm for estimating a bilinear state-space model with moving average noise (2022)
Journal Article
Gu, Y., Dai, W., Zhu, Q., & Nouri, H. (2023). Hierarchical multi-innovation stochastic gradient identification algorithm for estimating a bilinear state-space model with moving average noise. Journal of Computational and Applied Mathematics, 420, 114794. https://doi.org/10.1016/j.cam.2022.114794

This paper considers the combined parameter and state estimation problem of a bilinear state space system with moving average noise. There are product terms of state variables and control variables in bilinear systems, which brings difficulties to pa... Read More about Hierarchical multi-innovation stochastic gradient identification algorithm for estimating a bilinear state-space model with moving average noise.

Robust adaptive dynamic surface control scheme for a class of single‐input and single‐output uncertain nonlinear systems in strict‐feedback form (2022)
Journal Article
Soukkou, Y., Tadjine, M., Nibouche, M., & Zhu, Q. (2022). Robust adaptive dynamic surface control scheme for a class of single‐input and single‐output uncertain nonlinear systems in strict‐feedback form. International Journal of Adaptive Control and Signal Processing, 36(11), 2938-2952. https://doi.org/10.1002/acs.3486

This article presents a robust adaptive dynamic surface control using σ-modification adaptation laws for a class of single-input and single-output (SISO) uncertain nonlinear systems in strict-feedback form with parametric uncertainties and external d... Read More about Robust adaptive dynamic surface control scheme for a class of single‐input and single‐output uncertain nonlinear systems in strict‐feedback form.

Laser powder bed fusion of TiB2-modified Cu15Ni8Sn alloy: Processability, microstructure and mechanical performance (2022)
Journal Article
Gao, J., Han, Q., Wang, L., Liu, Z., Soe, S., Zhang, Z., & Gu, Y. (2022). Laser powder bed fusion of TiB2-modified Cu15Ni8Sn alloy: Processability, microstructure and mechanical performance. Materials Science and Engineering: A, 855, 143879. https://doi.org/10.1016/j.msea.2022.143879

Cu15Ni8Sn is widely used in the aerospace and electronics domains because of its good conductivity and toughness. Due to the material's high laser reflectivity and thermal conductivity, however, employing the laser powder bed fusion (LPBF) additive m... Read More about Laser powder bed fusion of TiB2-modified Cu15Ni8Sn alloy: Processability, microstructure and mechanical performance.

Graphene-based anti-corrosive coating on steel for reinforced concrete infrastructure applications: Challenges and potential (2022)
Journal Article
Qureshi, T., Wang, G., Mukherjee, S., Islam, M., Filleter, T., Singh, C. V., & Panesar, D. K. (2022). Graphene-based anti-corrosive coating on steel for reinforced concrete infrastructure applications: Challenges and potential. Construction and Building Materials, 351, 128947. https://doi.org/10.1016/j.conbuildmat.2022.128947

Steel corrosion has been a major perpetual issue of concern for durability and structural integrity of steel and reinforced concrete infrastructure. Polymeric, zinc-galvanic and chromate conversion coatings are commonly applied to protect typical ste... Read More about Graphene-based anti-corrosive coating on steel for reinforced concrete infrastructure applications: Challenges and potential.

An improved U-control design for nonlinear systems represented by input/output differential models with a disturbance observer (2022)
Journal Article
Li, R., Zhu, Q., Zhang, W., Yue, X., & Narayan, P. (in press). An improved U-control design for nonlinear systems represented by input/output differential models with a disturbance observer. International Journal of Control, 1-12. https://doi.org/10.1080/00207179.2022.2111370

This paper presents a new method to calculate the inversion of the controlled linear/nonlinear dynamic plants which are described by input–output differential equation models. This new U-model-based inverter (U-inverter), cancels both system dynamics... Read More about An improved U-control design for nonlinear systems represented by input/output differential models with a disturbance observer.

Investigation of flow augmentation and dynamic stall control devices as performance enhancement of lift-driven vertical axis wind turbine using high-fidelity CFD methods (2022)
Thesis
Syawitri, T. P. Investigation of flow augmentation and dynamic stall control devices as performance enhancement of lift-driven vertical axis wind turbine using high-fidelity CFD methods. (Thesis). University of the West of England. Retrieved from https://uwe-repository.worktribe.com/output/8045334

This study performs an investigation of dynamic stall control (Gurney flap (GF)) and flow augmentation (straight upstream deflector (SUD)) devices to improve the performance of lift-driven Vertical Axis Wind Turbine (VAWT) as they can improve the pow... Read More about Investigation of flow augmentation and dynamic stall control devices as performance enhancement of lift-driven vertical axis wind turbine using high-fidelity CFD methods.

GA-AHP Method to support robotic polishing process planning (2022)
Journal Article
Wang, K., Ding, L., Dailami, F., & Matthews, J. (2022). GA-AHP Method to support robotic polishing process planning. Digital Manufacturing Technology, 2(2), 23-44. https://doi.org/10.37256/dmt.2220221513

The finishing stage of mould manufacturing is generally completed via mechanical polishing, manual conducted. Not only is this the most expensive phase of the process but also is currently struggling with a deficit of skilled workers. To address thes... Read More about GA-AHP Method to support robotic polishing process planning.