Study on Statistical Method of Steel Bridge Parts Information Based on Three-Dimensional CAD

Parts information of steel bridge with tens of thousands of parts is difficult to be managed and be executed statistics. On the platform of three-dimensional CAD systems, steel bridge node is the study object in this paper, according to the assembly relationship of all parts in the three-dimensional assembly model, the parts list, quantity, geometrical information and weight of the parts of the steel bridge nodes are extracted from a three-dimensional model by the application interface provided by three-dimensional CAD systems. On the basis of geometrical information of the parts, the minimum boundary dimension of the parts is computed by use of the principle of computer graphics. The method can rapidly and accurately obtain parts information, and can provide basis for assembly process and processing technology.

Download Full-text

A three-dimensional gravity model of the southern contact of the Sebago pluton, Maine

Canadian Journal of Earth Sciences ◽

10.1139/e98-010 ◽

1998 ◽

Vol 35 (6) ◽

pp. 649-656 ◽

Cited By ~ 2

Author(s):

Mark D Behn ◽

J Dykstra Eusden, Jr. ◽

John A Notte III

Keyword(s):

Three Dimensional ◽

Average Thickness ◽

Uniform Thickness ◽

Dimensional Model ◽

Three Dimensional Model ◽

Metasedimentary Rocks ◽

The North ◽

Dimensional Gravity ◽

Relationship Of ◽

The Relationship

The Sebago pluton is a two-mica granite that intruded the metasedimentary rocks of the Central Maine Terrane around 292 Ma. In recent years, geologists have raised an increasing number of questions related to the overall thickness of the Sebago pluton and the position of its subsurface contact with the underlying metasedimentary rocks. Past studies have shown the Sebago pluton to be a thin, 1-2 km thick, subhorizontal sheet dipping 3° to the northeast. This study examines anomalies in the Earth's gravitational field related to the southern portion of the Sebago pluton, specifically to determine the thickness of the pluton and to locate the subsurface contact between the pluton and the underlying metasedimentary rocks. A three-dimensional model shows the thickest portions of the pluton (~1.8 km) to occur at the bottom of a bowl hape along the southwestern contact. Moreover, the model shows the pluton to thin toward the northern and eastern regions of the study area, where the average thickness is less than 0.5 km. The pluton appears to extend southward below the cover of the metasedimentary rocks along the southwestern contact. Thus, contrary to previous models, the Sebago pluton is not a northeasterly dipping sheet of uniform thickness, but rather an arched sheet with an irregular thickness extending beneath the metasedimentary rocks along both its northern and southern contacts. Based on this new geometry, either the relationship of the pluton to the surrounding metamorphic zones must be modified, or the possibility must be considered that the Sebago pluton is actually a composite batholith, composed of a younger (Permian) granite to the north and an older (Carboniferous) granite to the south.

Download Full-text

Design of Hydraulic Transmission Bicycle Based on Top-Down Method

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.468-471.867 ◽

2012 ◽

Vol 468-471 ◽

pp. 867-870 ◽

Cited By ~ 1

Author(s):

Yan Hong Yang ◽

Xiang Qiang Zhong

Keyword(s):

Rapid Development ◽

Three Dimensional ◽

New Product ◽

Feature Modeling ◽

Assembly Model ◽

Dimensional Model ◽

Three Dimensional Model ◽

Top Down ◽

Skeleton Model ◽

New Type

Hydraulic transmission bicycle is a new type of vehicle. It is crucial for founding an effective method of rapid development for new product. The concept drafting of hydraulic transmission bicycle was drawn, the multiple layer assembly model was built based on parametric feature modeling technique, the skeleton model and total design of hydraulic transmission bicycle was accomplished by top-down method and drawings of relevant parts based on three-dimensional model were created. The result shows that top-down method provides a new idea to improve the rapid design of product’s updates.

Download Full-text

The walking dead: Blender as a tool for paleontologists with a case study on extinct arachnids

Journal of Paleontology ◽

10.1666/13-088 ◽

2014 ◽

Vol 88 (4) ◽

pp. 735-746 ◽

Cited By ~ 45

Author(s):

Russell Garwood ◽

Jason Dunlop

Keyword(s):

Computer Graphics ◽

Learning Curve ◽

Three Dimensional ◽

Data File ◽

Dimensional Model ◽

Three Dimensional Model ◽

Steep Learning Curve ◽

The Walking Dead ◽

Data Files

This paper serves two roles. First, it acts as an introduction to Blender, an open-source computer graphics program, which can be of utility to paleontologists. To lessen the software's otherwise steep learning curve, a step-by-step guide to create an idealized reconstruction of a fossil in the form of a three-dimensional model in Blender, or to use the software to render results from ‘virtual paleontology' techniques, is provided as an online supplemental data file. Second, here we demonstrate the use of Blender with a case study on the extinct trigonotarbid arachnids. We report the limb articulations of members of the Devonian genusPalaeocharinuson the basis of exceptionally preserved fossils from the Rhynie Cherts of Scotland. We use these newly reported articulations to create a Blender model, and draw comparisons with the gait of extant arachnids to produce as accurate a representation of the trigonotarbid flexing its limbs and walking as possible, presented in additional online supplemental data files. Knowledge of the limb articulations of trigonotarbid arachnids also allows us to discuss their functional morphology: trigonotarbids' limbs and gait were likely comparable to extant cursorial spiders, but lacked some innovations seen in more derived arachnids.

Download Full-text