Pseudoedge: A Hierarchical Skeletal Modeler for the Design of Structural Components

Author(s):  
David L. Bonner ◽  
Mark J. Jakiela ◽  
Masaki Watanabe

Abstract A new design model for the creation of mechanical components has been developed. In this model, the shape is expressed by its areas of prominence or maximum curvature, for which we use the term pseudoedges. In terms of traditional design, these represent both fillet, chamfer and intersection lines, and more general shape features. The pseudoedges of the model combine with a skeletal shape that is used as a starting form, thereby creating a hierarchy of geometric dependencies that affords both global and local control. The surface is represented by a quilt of parametric Bezier patches, with tangent plane continuity everywhere and only certain isolated singularities. Considerable degrees of deformation are possible, with predictable control and at small computational expense; there is no need for computation of intersections or parameter space trimming of patches.

Facilities ◽  
2015 ◽  
Vol 33 (5/6) ◽  
pp. 280-301 ◽  
Author(s):  
Sui Pheng Low ◽  
Shang Gao ◽  
Kai Lin Tiong

Purpose – This study aims to examine how lean production principles (LPP) can be incorporated in the context of ramp-up factories to improve future ramp-up factory designs. The application of LPP to the facilities design of ramp-up factories can help to reduce waste and achieve higher-quality products. However, the traditional design philosophy of “design follows function” has not considered the application of LPP during the early design development stage to more effectively meet tenants’ operational needs at the occupation stage. Design/methodology/approach – Based on a review of past literature, a set of LPP-driven facilities design features is presented, which seek to integrate traditional design principles and LPP. A survey was subsequently carried out with tenants operating in ramp-up factories to determine the relevance of the proposed LPP-driven facilities design features from their perspectives. Findings – It is found that generally most of the proposed LPP-driven facilities design features can help to improve tenants’ operational needs after the building is occupied. The study found that the significant LPP-driven facilities design features for ramp-up factories include: large span, clear floor-to-ceiling height, rectangular bay, wide frontage area, mezzanine floor system, evenly distributed lighting, white or light colour surfaces, private parking spaces, private loading/unloading bay, clearly defined car park entrance, wide vehicular ramp, wide driveway, sheltered loading/unloading bay and multi-storey car park embedded in the complex. The reasons for their significance are explained in the study. Practical implications – The LPP design model for ramp-up factories provides a useful checklist of important tenants’ requirements for the designers of ramp-up factories. This research also suggests that it is desirable to apply LPP in the design stage to improve the facilities design of ramp-up factories that is beneficial to tenants at the occupation stage. Originality/value – This research formulated a design model integrated with LPP for ramp-up factories. It extends the traditional design approach of “design follows function” to encompass LPP to transform the approach to a new LPP-driven facilities design philosophy. This new approach serves to better meet tenants’ requirements at the occupation stage. It is recommended that architecture schools incorporate the LPP-driven facilities design approach as one of their educational outcomes.


1994 ◽  
Vol 116 (1) ◽  
pp. 210-214
Author(s):  
D. P. Sathyadev ◽  
A. H. Soni

A tangent-plane undergoing two-parameter motion envelopes a surface called the tangent-plane envelope. Such surfaces can be considered as the envelope of a two-parameter family of planes or ∞2 family of planes. The properties of the tangent-plane motion are characterized through the properties of the spherical image of the normal to the surface it envelopes. This paper presents a methodology to locate a family of planes that envelope surfaces with similar characteristics.


Scilight ◽  
2020 ◽  
Vol 2020 (33) ◽  
pp. 331101
Author(s):  
Chris Patrick

2006 ◽  
Vol 27 (2) ◽  
pp. 107-114 ◽  
Author(s):  
Kazuhisa Kinoshita ◽  
Tim L. Noetzel ◽  
Isabelle Arnal ◽  
David N. Drechsel ◽  
Anthony A. Hyman

2009 ◽  
Vol 628-629 ◽  
pp. 161-166
Author(s):  
Wen Ke Kang ◽  
Z.X. Hou ◽  
Ding Hua Zhang ◽  
F.X. Yan ◽  
X.L. Gong

Top-down design is an effective solution for global and local trade-off of color deigns process. Based on the characteristics of computer-aided color design (CACD), we studied the Ostwald Color Harmony theory and realized a novel method with computer-aided color harmony by the translation on the coordinate systems. Some key techniques, such as constructions on product color scheme database, mapping tree model and Top-Down Color Design Model (TDCDM) are elaborated. Finally, with the integration of CAXA solid design software, we implemented the computer-aided product color innovative design.


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