Efficient tool path computation using multi-core GPUs

Tool path generation is one of the most complex problems in Computer Aided Manufacturing. Although some efficient strategies have been developed, most of them are only useful for standard machining. However, the algorithms used for tool path computation demand a higher computation performance, which makes the implementation on many existing systems very slow or even impractical. Hardware acceleration is an incremental solution that can be cleanly added to these systems while keeping everything else intact. It is completely transparent to the user. The cost is much lower and the development time is much shorter than replacing the computers by faster ones. This paper presents an optimisation that uses a specific graphic hardware approach using the power of multi-core Graphic Processing Units (GPUs) in order to improve the tool path computation. This improvement is applied on a highly accurate and robust tool path generation algorithm. The paper presents, as a case of study, a fully implemented algorithm used for turning lathe machining of shoe lasts. A comparative study will show the gain achieved in terms of total computing time. The execution time is almost two orders of magnitude faster than modern PCs.

Three-dimensional planar model estimation using multi-constraint knowledge based on k-means and RANSAC

Plane model extraction from three-dimensional point clouds is a necessary step in many different applications such as planar object reconstruction, indoor mapping and indoor localization. Different RANdom SAmple Consensus (RANSAC)-based methods have been proposed for this purpose in recent years. In this study, we propose a novel method-based on RANSAC called Multiplane Model Estimation, which can estimate multiple plane models simultaneously from a noisy point cloud using the knowledge extracted from a scene (or an object) in order to reconstruct it accurately. This method comprises two steps: first, it clusters the data into planar faces that preserve some constraints defined by knowledge related to the object (e.g., the angles between faces); and second, the models of the planes are estimated based on these data using a novel multi-constraint RANSAC. We performed experiments in the clustering and RANSAC stages, which showed that the proposed method performed better than state-of-the-art methods.

Braking system performance of selected 1978 model year trucks and multi-purpose vehicles. Final report.

Mode of access: Internet.

Development and use of a computer simulation model for the evaluation of design and control alternatives for intersections of minor roads with multi-lane rural highways: field studies and model validation. Interim report.

Federal Highway Administration, Washington, D.C.

Development and use of a computer simulation model for the evaluation of design and control alternatives for intersections of minor roads with multi-lane rural highways: model application. Interim report.

Federal Highway Administration, Washington, D.C.

Development and use of a computer simulation model for the evaluation of design and control alternatives for intersections of minor roads with multi-lane rural highways: selection of the simulation model. Interim report.

Federal Highway Administration, Washington, D.C.

Operator, organizational, direct, and general support maintenance manual : heater, space, multi-fuel, with blower, 60,000 Btu/hr (Hunter model UH-68D), FSN 4520-114-1055.

"June 1969."

Operator, organizational, direct support, and general support maintenance manual : loader, scoop type, DED, 4 wheel drive, pneumatic tired, hinged frame steer, 2 1/2 cu. yd. multi-purpose bucket (J.I. Case model MW-24), FSN 3805-253-0627.

"December 1970."

Operator, organizational, field, and depot maintenance manual : loader, scoop type, diesel engine, 4 wheel drive, rear wheel steerable pneumatic tires, 2 1/2 cu yd, w/multi-segment bucket (Frank G. Hough model H-90CM), FSN 3805-995-3236.

"February 1964."

Organizational maintenance repair parts and special tools lists : loader, scoop type, diesel engine, 4-wheel drive, rear wheel steerable pneumatic tires, 2 1/2 cu yd, w/ multi-segment bucket, (Frank G. Hough model H-90CM) FSN 3805-995-3236.

Includes index.

Organizational maintenance repair parts and special tools lists : loader, scoop type, DED, 4-wheel drive, pneumatic tired hinged frame steer 2 1/2 cu yd, multi-purpose bucket, NSN 3805-00-169-4711, J.I. Case model MW24B.

Includes index.

Direct support and general support maintenance repair parts and special tools lists (including depot maintenance repair parts and special tools) : loader, scoop type, DED, 4-wheel drive, pneumatic tired hinged frame steer 1 1/2 cu yd, multi-purpose bucket, NSN 3805-00-169-4711, J.I. Case model MW24B.

Includes index.

Direct and general support maintenance repair parts and special tools list (including depot maintenance repair parts and special tools) : loader, scoop type, pneu-tired, diesel engine driven, hinged frame steer with 2 1/2 cubic yard multi-purpose bucket, (Allis-Chalmers model 645M), FSN 3805-051-9359.

Includes index.

Operator and organizational maintenance manual : loader, scoop type, pneu-tired, diesel engine driven, hinged frame steer with 2 1/2 cu yd multi-purpose bucket, Allis-Chalmers model 645M, FSN 3805-051-9359.

"July 1968."

Operator, organizational, direct support, and general support maintenance manual : loader, scoop type, DED, 4 wheel drive, pneumatic tired, hinged frame steer, 2 1/2 cu. yd. multi-purpose bucket (J.I. Case model MW-24), FSN 3805-253-0627.

"December 1970."