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Smart design of hull forms through hybrid evolutionary algorithm and morphing approach
Published in Pentti Kujala, Liangliang Lu, Marine Design XIII, 2018
J.H. Ang, V.P. Jirafe, C. Goh, Y. Li
Metamorphosis, also known as morphing, is a technique used widely in the animation industry to generate a sequence of images that smoothly transform a source to another target image. It is also applied in computer graphic and industrial design to compute a continuous transformation from a source to another target shape. Morphing can be a very useful tool for the designer to modify, manipulate, transform the shape or geometry of the design in pursuit to improve the design attributes such as performance, quality, aesthetic, etc. Morphing can be catergorised into 2 main types—two-dimensional (2D) or three dimensional (3D). 2D morphing consist of image morphing and curve morphing and 3D morphing include surface morphing and volume morphing. In ship application, (Tahara et al., 2006) applied morphing using 3D patch model from NAPA to transform a ship hull model into another target model. (Kang & Lee 2010) applied 3D meshbased surface morphing to generate intermediate hull models between two parent vessels.
Basics of Image Processing
Published in Maheshkumar H. Kolekar, Intelligent Video Surveillance Systems, 2018
Morphing is a process of transforming one image to another through a seamless transition. It is a technique that allows to blending two images, creating a sequence of in-between pictures. When played, this sequence converts the first image into the second, creating animation effect. This type of special effect is used to depict some technological processes and fantasy sequences. Figure 1.5 shows morphing of child to woman. Morphing algorithms are used to create convincing slow-motion effects by morphing between each individual frame using optical flow technology. Morphing techniques are used to enhance multimedia projects, presentations, movies, education, and training.
A multi-objective optimisation study of trimaran hull applying RBF-Morph technique and integrated optimisation platform at two design speeds
Published in Ships and Offshore Structures, 2022
Geometry parametrisation of the ship hulls is a key component of the hull form’s optimisation. Defined parameters determine the quality and magnitude of computations. There are two types of geometry parametrisation; CAD-based and mesh-based. Shape deformation can be implemented by morphing techniques that have been widely developed in the past decade. In addition, the morphing technique can be classified into two categories: CAD-based morphing like free form deformation (FFD) and mesh morphing like RBF-Morph. Mesh-morphing technique eliminates one step of the optimisation process. Geometry reconstruction and volume mesh execution are omitted in mesh-morphing technique. In other words, Mesh morphing automatically morphs an existing mesh to conform to geometry modifications and consequently, rapid prototyping of design variations is achieved. Mesh-morphing tools alter the geometry at the mesh level, instead of CAD-based geometry reconstruction. Mesh-morphing tool leads to elimination of hull form regeneration and reduces optimisation time (De Boer et al. 2007; Biancolini et al. 2013). Another advantage of mesh morphing is maintaining the continuity and smoothness of hull during the optimisation cycle.
Morphing boxes for the integration of shape optimization in the product design process
Published in Computer-Aided Design and Applications, 2018
Alexander Brune, Thiago Weber Martins, Reiner Anderl
Morphing methods have their origin in computer graphics but have applications in various fields which require the modeling of geometric changes [10]. In the context of shape optimization, they either serve the purpose of preserving FE mesh quality, see for example [11], or that of shape parameterization [2]. It is this second application which is of interest in this paper. In particular, morphing boxes, the concept of which was first proposed by Perry et al. in [6], are used to define design changes in shape optimization. Various other approaches are listed in [9]. The main idea of morphing boxes has been explained in Perry et al. [6] based on [8]:“Consider a cube of clear, flexible plastic, in which several objects have been embedded. The embedded objects have the same degree of flexibility as the cube. As the plastic cube is deformed, the embedded objects are also deformed in an intuitive manner.“The main contribution of this work is to use morphing boxes to parameterize the part of the product design geometry that is to be modified within the optimization – in the FE model as well as in the CAD model. In this way, they provide an interface by which the FE mesh-based optimization results are applied to the CAD model. In the optimization step, the morphing box parameterization is coupled to a sensitivity-based optimization algorithm, which is crucial when considering efficiency.