Computer Aided Design Applications Research Papers (original) (raw)

ABSTRACT Recent literature in Systems Engineering has suggested the use of “value” to drive decision-making activities during preliminary design, in particular when choosing technologies and components for a complex system. However, to... more

ABSTRACT Recent literature in Systems Engineering has suggested the use of “value” to drive decision-making activities during preliminary design, in particular when choosing technologies and components for a complex system. However, to correctly evaluate design trade-offs, a visual link has to be established between the results of the value model and a product shape/geometry. This paper proposes the use of color-coded 3D CAD models to support the visualization of value analysis results in a Stage-Gate R � process. The approach has been developed and exemplified within a case study related to the design of an aero-engine component, and has been demonstrated using SIEMENS NX HD3D Visual Reporting. The results of verification activities conducted in a laboratory setting show that the use of color-coded 3D CAD models increases the decision makers’ awareness of value-related information in a Stage-Gate process.

Reverse engineering is the process of obtaining a geometric CAD model from 3D points acquired by scanning an existing physical model. It is widely used in numerous applications, such as manufacturing, industrial design and jewelry design... more

Reverse engineering is the process of obtaining a geometric CAD model from 3D points acquired by scanning an existing physical model. It is widely used in numerous applications, such as manufacturing, industrial design and jewelry design and ...

We present a symbolic-numeric algorithm for Boolean set operations, closed in the algebra of curved polyhedra triangulated with compactly supported cubic algebraic surface patches. The input simplicial polyhedral representation includes... more

We present a symbolic-numeric algorithm for Boolean set operations, closed in the algebra of curved polyhedra triangulated with compactly supported cubic algebraic surface patches. The input simplicial polyhedral representation includes the vertices of the triangulation and prescribed vertex normals. On each triangle of this boundary representation, a piecewise cubic algebraic interpolant is constructed, using a C-continuous algebraic patch (prism A-patch) that interpolates the triangle vertices, with given normals. In order to represent flat and/or sharp local features, the normal-perface and/or normal-per-edge may be given, respectively. The boundary topology is described by storing, for each triangle, the two triples of pointers to incident vertices and to adjacent triangles. For each triangle, a scaffolding prism is built, which provides a containment volume for the interpolating A-patch. When looking for the result of a regularized Boolean operation, the 0-set of a three-variat...

Reality-based 3D techniques and Finite Element Analysis share the way the object under investigation is discretized. Although their purpose, the generation methods and the quality metrics are di erent, both of them ground on the concept... more

Reality-based 3D techniques and Finite Element Analysis share the way the object under investigation is discretized. Although their purpose, the generation methods and the quality metrics are di erent, both of them ground on the concept of mesh. Unfortunately, a mesh derived from a reality-based technique are not suitable to be used in a nite element solver directly. This paper aims at comparing di erent methods to prepare computational mesh of geometries derived from non-contact reality-based technologies. A benchmark test object has been acquired with di erent devices, a triangulation laser scanner, a multi-stripe triangulation scanner and a digital camera, and post processed in order to x artifacts. Then, two di erent decimation approaches have been used: a triangular simpli cation and retopology. The acquired geometry, before and after the simpli cations, has been compared with a CAD model employed as reference: mean and standard deviation between the nominal and the acquired ge...

Energy Reclamation Application (E.R.A) makes use of the exhaust energy which is considered as waste and converts the kinetic energy into electricity. It provides cleaner, greener & smarter energy. E.R.A. is applicable to all vehicles, by... more

Energy Reclamation Application (E.R.A) makes use of the exhaust energy which is considered as waste and converts the kinetic energy into electricity. It provides cleaner, greener & smarter energy. E.R.A. is applicable to all vehicles, by which cleaner & greener vehicle driving is possible. This paper discusses the device to make use of the exhaust gas produced to generate electricity so as to run the electronic equipment present in the car such as HVAC units, music player, power windows, power seats, power door locks, horns, wipers & washers, ignition systems, starting systems and many other components. Today's car exhaust converters rely on the high catalytic power of the transition metals Pt., Pd or Rh for a reduction of the NO x, CO content in the emission. Unfortunately, the performance of these materials is substantially reduced under highly oxidizing conditions (as e.g. in diesel engines), presumably through oxide formation. Ru, on the other hand, does not seem to suffer f...

Sketching continues to be a vital part of methods and technologies related to Concept Development, including those analyzed in this paper: “concept design with constraints”, “solid from sketch”, “sketching on a point cloud ” and... more

Sketching continues to be a vital part of methods and technologies related to Concept Development, including those analyzed in this paper: “concept design with constraints”, “solid from sketch”, “sketching on a point cloud ” and “geometric modeling of design constraints”. Existing methods are analyzed and critical subproblems are identified. New solution methods are proposed for the subjects “solid from sketch ” and “sketching on a point cloud”.

Building information modeling (BIM) is a process based on so called intelligent three dimensional (3D) models. These models incorporate not only dimensional properties of the product. They incorporate all information’s about functional or... more

Building information modeling (BIM) is a process based on so called intelligent three dimensional (3D) models. These models incorporate not only dimensional properties of the product. They incorporate all information’s about functional or descriptive properties. There is significant difference between computer aided design (CAD) modeling and BIM modeling. Goal of this paper is to describe and highlight that differences. Through the paper it is described when, where and why BIM modeling needs to be used. Idea behind BIM modeling principles is described in detail. In addition, advantages and disadvantages of BIM modeling is highlighted. Potential possibilities of using BIM modeling in the field of mechanical engineering have been presented.