We describe a lighting design system driven by sketching on 3D virtual models. Conventional lighting design tools simulate the lighting effects of design decisions such as window locations, surface treatments, and fixture placement. Light Pen takes the inverse approach by allowing the designer to indicate desired illumination on a 3D model. This serves as input to a knowledge-based lighting des...

PURPOSE The marginal bone levels around implants following restoration are used as a reference for evaluating implant success and survival. Two design concepts that can reduce crestal bone resorption are the microthread and platform-switching concepts. The aims of this study were to analyze the placement of microthreaded and platform-switched implants and their short-term survival rate, as well...

In this paper, the tensile testing method at the intermediate strain rate is established and tensile tests of steel sheets for an auto-body have been performed to evaluate dynamic material properties. A high speed tensile testing machine has been developed for tensile tests at the intermediate strain rate. A simple jig fixture for gripping a specimen has been designed to diminish the load ringi...

This paper deals with the design of the welding fixture for the head end sub-assembly of a rocket motor case. The head end sub-assembly consists of four parts namely Y-Ring, Dome, Igniter Boss and the Fore skirt ring that have to be welded to each other with a specified tolerance and weld quality. The material used in the manufacture of different parts of head end sub-assembly is Maraging steel...

Fixture synthesis addresses the problem of fixture-elements placement on workpiece surfaces. This article presents a novel variant simulated annealing (SA) algorithm called declining neighborhood (DNSA) specifically developed for fixture synthesis. The objective is to minimize measurement errors in machined features induced by misalignment at locators-workpiece contact points. systematically ev...

We are developing a new hybrid process planning approach that uses a generative procedure to select processes and a variant fixture planning procedure to complete the process plan. This paper describes components of this approach and related work on indexing mechanical designs and estimating manufacturing cycle time during product design. Specifically, we have created data structures that repre...

Space vehicles will be subjected to high intensity impact during different stages of its course of application. High intensity explosive devices will be used in these vehicles for serving various functions like stage separation. These explosive devices will be attached to the space vehicles and once they are initiated high intensity impact will get produced due to explosion which will get trans...

Fixture imperfections influence dimensional variation on machining processes. Therefore, a systematic method to isolate fixture faults will allow improving product quality. This paper presents a diagnosis methodology to identify root causes of fixture induce workpiece variation in machining. The proposed methodology is based on designated component analysis which extracts predefined variation p...

Fixture faults have been identified as a principal root cause of defective products in assembly lines; however, there exists a lack of fast and accurate monitoring tools to detect fixture fault damage. Locating fixture damage causes a decrease in product quality and production throughput due to the extensive work required to detect and diagnosis a faulty fixture. In this paper, a unique algorit...