scholarly journals Designing double freeform surfaces for large ray bending irradiance tailoring of extended LED sources

2021 ◽  
Author(s):  
ZeXin Feng ◽  
Yuyin Li ◽  
Dewen Cheng ◽  
Yongtian Wang
Keyword(s):  
Freeform Surfaces ◽  
Ray Bending

BIM based decision-support tool for automating design to fabrication process of freeform lattice space structure

2021 ◽  
pp. 095605992110338
Author(s):  
Saeid Haghir ◽  
Ramtin Haghnazar ◽  
Sara Saghafi Moghaddam ◽  
Danial Keramat ◽  
Mohammad Reza Matini ◽  
...  
Keyword(s):  
Computer Aided Design ◽  
Decision Support Tool ◽  
Computational Design ◽  
Space Structure ◽  
Digital Design ◽  
Information Modeling ◽  
Freeform Surfaces ◽  
Geometric Problem ◽  
Support Tool ◽  
Lattice Space

Complex freeform surfaces and structures are increasingly designed and used in the product and building industry due to the advances in mathematics and digital design tools. However, there is still a gap between designing freeform surfaces and fabricating them. The process of preparing freeform surfaces’ shop drawings is complicated, time-consuming, and lacks the mutual understanding among the stakeholders. Computational design and Building Information Modeling (BIM) can serve as a mediator agent for the integration of design goals with the geometric logic of constructability. They can also facilitate creating platforms for designing and evaluating freeform structures. This open-ended qualitative research attempts to develop a systematic methodology for automating the design and construction drafting process of freeform lattice space structure. Solving this complex geometric problem aims to benefit the design for construction and manufacturers and shrink the cost and time of the process. The study employs a 3D computer-aided design (CAD) tool and introduces an algorithm that generates a BIM model. The BIM model contains shop drawings and suggests the specifications of the main elements, such as beams, glass panels, and nodes.

scholarly journals Laser based micro texturing of freeform surfaces of implants using a Stewart platform

2021 ◽  
Author(s):  
K.E.Ch. Vidyasagar ◽  
Varun Aggarwal ◽  
Sasanka Sekhar Sinha ◽  
Subir Kumar Saha ◽  
Dinesh Kalyanasundaram
Keyword(s):  
Stewart Platform ◽  
Freeform Surfaces

scholarly journals Ellipsoid Packing Structures on Freeform Surfaces

2018 ◽  
Vol 37 (7) ◽  
pp. 87-95
Author(s):  
Qun‐Ce Xu ◽  
Bailin Deng ◽  
Yong‐Liang Yang
Keyword(s):  
Freeform Surfaces

Channel waves in cross‐borehole data

Geophysics ◽  
1992 ◽  
Vol 57 (2) ◽  
pp. 334-342 ◽  
Author(s):  
Larry R. Lines ◽  
Kenneth R. Kelly ◽  
John Queen
Keyword(s):  
Seismic Velocity ◽  
Test Facility ◽  
Equation Modeling ◽  
Borehole Data ◽  
Geological Information ◽  
Channel Wave ◽  
First Arrival ◽  
Borehole Seismic ◽  
Seismic Velocity Contrasts ◽  
Ray Bending

Layered geological formations with large seismic velocity contrasts can effectively create channel waves in cross‐borehole seismic data. The existence of channel waves for such waveguides can be confirmed by ray tracing, wave equation modeling, and modal analysis. Channel wave arrivals are identified in cross‐borehole data recorded at Conoco’s Newkirk test facility. For these data, where velocity contrasts are about 2 to 1, tomography based on first arrival traveltimes, is limited due to problems with extreme ray bending and seismic shadow zones. However, it may be possible to extract geological information using channel wave information. The seismometer differencing method appears to be a promising approach for detecting waveguide boundaries by use of cross‐borehole data.

scholarly journals Deployment and evaluation of a dual-sensor autofocusing method for on-machine measurement of patterns of small holes on freeform surfaces

2014 ◽  
Vol 53 (10) ◽  
pp. 2246
Author(s):  
Xiaomei Chen ◽  
Andrew Longstaff ◽  
Simon Fletcher ◽  
Alan Myers
Keyword(s):  
Freeform Surfaces ◽  
Dual Sensor ◽  
Small Holes

Dispersed grinding wheel profiles for accurate freeform surfaces

2011 ◽  
Vol 51 (6) ◽  
pp. 536-542 ◽  
Author(s):  
J. Xie ◽  
J.H. Zheng ◽  
R.M. Zhou ◽  
B. Lin
Keyword(s):  
Grinding Wheel ◽  
Freeform Surfaces

Kinematically Generated Dual Tensor-Product Surfaces

1998 ◽  
Author(s):  
Q. J. Ge ◽  
D. Kang ◽  
M. Sirchia
Keyword(s):  
Tensor Product ◽  
Geometric Design ◽  
Computer Aided Geometric Design ◽  
Freeform Surfaces ◽  
Computer Aided ◽  
Design And Manufacture ◽  
Two Parameter

Abstract This paper takes advantage of the duality between point and plane geometries and studies a class of tensor-product surfaces that can be generated kinematically as surfaces enveloped by a plane under two-parameter rational Bézier motions. The results of this cross-disciplinary work, between the field of Computer Aided Geometric Design and Kinematics, can be used as a basis for studying geometric and kinematic issues associated with the design and manufacture of freeform surfaces.

scholarly journals CNC centralized control for digitizing freeform surfaces by means of a conoscopic holography sensor integrated in a machining centre

2019 ◽  
Vol 55 ◽  
pp. 474-483 ◽  
Author(s):  
Pablo Zapico ◽  
Héctor Patiño ◽  
Gonzalo Valiño ◽  
Pedro Fernández ◽  
J. Carlos Rico
Keyword(s):  
Centralized Control ◽  
Freeform Surfaces ◽  
Conoscopic Holography
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