Lhachemi, Hugo

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Lhachemi, Hugo
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Lhachemi, Hugo

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  • Publication
    An Application of 3D Model Reconstruction and Augmented Reality for Real-Time Monitoring of Additive Manufacturing
    (Elsevier, 2019-06-14)
    Malik, Ammar 
    ;
    Lhachemi, Hugo 
    ;
    Ploennigs, Joern 
    ;
    Ba, Amadou 
    ;
    Shorten, Robert 
    This paper presents a novel scan-based method for the real-time monitoring of additive manufacturing processes. Most traditional scanning techniques used for generating 3D models capture the only outer shape of the object after completion of the printing process. The method proposed in this paper differs as it relies on a layer-by-layer scanning of the 3D object directly during the printing process. This strategy has been successfully implemented with a fused filament 3D printer (PRUSA i3 MK3). Furthermore, in order to offer an increased interaction between the obtained 3D model and the user, a virtual environment has been developed for the augmented reality glasses HoloLens. The novelty of this method lies in the layer-by-layer 3D model reconstruction of both the outer shape and the inner layers of the printed part. It enables the user, directly during the printing process, to view and detect potential defects, not only at the surface but also in the inner layers of the printed object. Therefore, it can provide detailed information about the build quality and can be used as the basis of a decision-making tool.
      115Scopus© Citations 33
  • Publication
    ISS of a Clamped-Free Damped String for the Configurations Associated with the Loss of the Riesz-Spectral Properties
    (IEEE, 2019-06-28)
    Lhachemi, Hugo 
    ;
    Shorten, Robert 
    This paper deals with the Input-to-State Stability (ISS) of a clamped-free damped string with respect to boundary disturbances for the configurations associated with the loss of the Riesz-spectral properties. Specifically, for most of the values of the physical parameters (namely the stiffness parameter and the damping coefficient), the ISS property of the clamped free damped string can be established based on the fact that the underlying disturbance-free operator is a Riesz-spectral operator. However, such a Riesz-spectral property does not hold true for certain configurations of the physical parameters of the damped string. This paper specifically investigates the establishment of an ISS estimate for these configurations. The proposed strategy relies on the projection of the original system trajectories in a Riesz basis obtained by adequately completing the set of eigenvectors of the disturbance-free operator.
      183
  • Publication
    On Design for Additive Manufacturing: Review of Challenges and Opportunities utilising Visualisation Technologies
    (IEEE, 2019-06-19)
    Newell, Anthony 
    ;
    George, Abraham 
    ;
    Papakostas, Nikolaos 
    ;
    Lhachemi, Hugo 
    ;
    Malik, Ammar 
    ;
    Shorten, Robert 
    Design for additive manufacturing poses new challenges and opportunities for manufacturers to produce highly customised parts while reducing cost, production time and improving quality. Manufacturing constraints of conventional manufacturing methods, such as geometric complexity limitations and workpiece handling, have shaped the landscape of computer-aided design tools, which are therefore not suitably adapted to design for additive manufacturing. Furthermore, computer-aided design tools require a high level of training to produce appropriate models. Augmented reality and feedback technologies pose an interesting opportunity for design for additive manufacturing, whereby the interaction with 3D models in an augmented or virtual design space can provide intuitive feedback to engineers and designers, providing fast validation of designs, parametric modelling and opportunities for training and use in both professional and amateur designer communities. This paper will explore and review the opportunities this exciting new technology provides.
      320Scopus© Citations 7
  • Publication
    On the design of cyber-physical control system for a smart pedelec (Ebike)
    (IEEE, 2019-12-13)
    Mannion, Andrew 
    ;
    Lhachemi, Hugo 
    ;
    Russo, Giovanni 
    ;
    Sweeney, Shaun 
    ;
    Shorten, Robert 
    We present a cyber-physical control system for deployment on a smart pedelec (Ebike). The goal of the control is to manage the interaction between a human and a motor intervention, for applications in which we wish to control physical aspects of the cycling behaviour (e.g. heart rate and breathing rate). The basis of the control is a pitchfork bifurcation system, augmented using ideas from gain-scheduling. Experiments have been conducted, showing the validity of the proposed control strategy. A use case dealing with the regulation of human ventilation characteristics in response to exogenous pollution measurements is presented.
      237Scopus© Citations 8