malkav30's assembly_simulation [7 articles]

Abstract

The paper presents geometric tools for an automated Design for Assembly (DFA) assessment system. For each component in an assembly a two step features search is performed: firstly (using the minimal bounding box) mass, dimensions and symmetries are identified allowing the part to be classified, according to DFA convention, as either rotational or prismatic; secondly form features are extracted allowing an effective method of mechanised orientation to be determined. Together these algorithms support the fuzzy decision support system, of an assembly-orientated ...

Abstract

Abstract  Current computer-aided assembly systems provide engineers with a variety of spatial snapping and alignment techniques for interactively defining the positions and attachments of components. With the advent of haptics and its integration into virtual assembly systems, users now have the potential advantage of tactile information. This paper reports research that aims to quantify how the provision of haptic feedback in an assembly system can affect user performance. To investigate human–computer interaction processes in assembly modeling, performance of a peg-in-hole manipulation was ...

Abstract

Abstract  Interactive assembly based on virtual reality offers users an opportunity to interact with a virtual prototyping rather than a physical one and to validate assembly performance of products in a realistic way. Such evaluations could be available very early in the product development process ahead of any physical prototyping. The reduction or elimination of physical prototyping needed for assembly performance validation can substantially shorten the product development cycle and reduce development cost. Although virtual reality technology provides users an intuitive and ...

Abstract

This contribution introduces a new framework for assembly modeling in Virtual Reality. Aiming at an easy instructability of the virtual environment, the framework provides a task-level interface which directly maps logical assembly commands to corresponding changes in the geometry scene. For example, the visual assembly of two parts is achieved given only a single command ‘connect(a,b)’. This is in contrast to the assembly modeling style of conventional CAD systems which forces the designer to break down each conceptual assembly task into ...

Abstract

Geometric representation of surfaces by spherical harmonics has been is the subject of substantial research in the past years, particularly because of its capacity for compression and filtering. The topic of representing surfaces by spherical harmonics is well developed, and to exploit these methods of representation in an application one important feature is the ability to perform collision detection between multiple objects depicted using this representation. In this paper we propose an approach to perform collision detection on two surfaces represented ...

Abstract

Free-form surfaces are widely used in advanced optical and mechanical devices. In order to assess the form accuracy of free-form surfaces, it is needed to fit the measurement surface with the design template. To improve the fitting efficiency and accuracy, the fitting procedure is divided into two stages, rough fitting and final fitting. A new rough fitting method, called structured region signature is proposed. Structured region signature is a generalised global feature which represents the surface shape by a one-dimensional function. ...

Abstract

Assembly/Disassembly (A/D) simulations using haptic devices are facingdifficulties while simulating insertion/extraction operations such asremoving cylinders from holes. In order to address this configuration aswell as others, an approach based on contact identification betweencomponents is presented in this paper. This approach can efficientlycontribute either to a new A/D simulation preparation process relying ontwo types of shape representations (mesh and CAD NURBS models), ordirectly to the real time simulation process when it is performed with6D haptic devices. The model processing pipeline is described ...