Measuring geometrical quality of different 3D linear element types

2021 ◽  
Author(s):  
Claudio Lobos ◽  
Cristopher Arenas ◽  
Esteban Daines ◽  
Nancy Hitschfeld
Keyword(s):  
Linear Element ◽  
Geometrical Quality

scholarly journals Towards Managing Visual Pollution: A 3D Isovist and Voxel Approach to Advertisement Billboard Visual Impact Assessment

2021 ◽  
Vol 10 (10) ◽  
pp. 656
Author(s):  
Szymon Chmielewski
Keyword(s):  
Cultural Context ◽  
Policy Makers ◽  
Quality Issue ◽  
Geometrical Quality ◽  
Visual Landscape ◽  
Landscape Quality ◽  
Visual Impact ◽  
The Impact ◽  
Visible Volume

Visual pollution (VP) is a visual landscape quality issue, and its most consistently recognized symptom is an excess of out of home advertising billboards (OOHb). However, the VP related research concerns landscape aesthetic and advertisement cultural context, leaving the impact of outdoor billboard infrastructure on landscape openness unanswered to date. This research aims to assess the visual impact of outdoor billboard infrastructure on landscape openness, precisely the visual volume—a key geometrical quality of a landscape. The method uses 3D isovists and voxels to calculate the visible and obstructed subsets of visible volume. Using two case studies (Lublin City, Poland) and 26 measurement points, it was found that OOHb decreased landscape openness by at least 4% of visible volume; however, the severe impact may concern up to 35% of visual volume. GIS scientists develop the proposed method for policy-makers, and urban planners end users. It is also the very first example of compiling 3D isovists and voxels in ArcGIS Pro software in an easy-to-replicate framework. The research results, accompanied by statistically significant proofs, explain the visual landscape’s fragility and contribute to understanding the VP phenomenon.

Nature’s Mathematics

2019 ◽  
pp. 17-36
Author(s):  
Thomas Owens
Keyword(s):  
Material World ◽  
Geometrical Quality ◽  
Mathematical Expressions ◽  
The World ◽  
The Mind ◽  
Theological Vision

Chapter 1 explores the geometrical quality of Wordsworth’s and Coleridge’s imaginative commitments. Focusing principally on The Pedlar, the Guide to the Lakes, and Coleridge’s Notebooks, the chapter locates the origins of Wordsworth’s and Coleridge’s geometric visions in a divinely relational language of shapes which they intuited as children to describe the world about them and which moulded their shared Pedlar consciousness in the 1790s. It proposes that Wordsworth and Coleridge sustained the mathematical expressions of the Pedlar’s ethico-theological vision in their dealings with nature and the mind, perceiving in the material world a language of geometric forms which held it together.

Simulation of a Three-Stage Process for Forming a Closed Cone From a Plate

2008 ◽  
Author(s):  
Zhengkun Feng ◽  
Henri Champliaud ◽  
Thien-My Dao
Keyword(s):  
Numerical Simulations ◽  
Explicit Scheme ◽  
Implicit Scheme ◽  
Commercial Software ◽  
Geometrical Quality ◽  
Trailing Edges ◽  
Stage Process ◽  
Closed Cone

High geometrical quality of bent cones is required in assembling several cone segments into a crown of Francis turbines. Although closed cones were successfully obtained using pyramidal three-roll conical bending machines with cylindrical rolls which is more adaptive and less expensive, the zones close to the leading and trailing edges of the plate never pass under the inner roll and remain planar. For the purpose of obtaining high geometrical quality, a three-stage process is proposed to obtain a jointed cone with no planar zones. The planar zones resulted from the first stage of the conical bending is eliminated after the repassing of the bent cone in the bending machine with the leading and trailing edges jointed together by forces. Numerical simulations with commercial software ANSYS/LS-DYNA in explicit scheme and ANSYS in implicit scheme are performed and bent cones with improved qualities are obtained.

scholarly journals EFFECT OF SPOT WELD POSITION VARIATION ON QUALITY OF AUTOMOBILE SHEET METAL PARTS

2013 ◽  
pp. 170-174
Author(s):  
M.P. MALI ◽  
K.H. INAMDAR
Keyword(s):  
Welding Process ◽  
The Body ◽  
Spot Weld ◽  
Spot Welds ◽  
Factors Affecting ◽  
Sheet Metal Parts ◽  
Geometrical Quality ◽  
Welding Sequence ◽  
Geometrical Factors

Resistance spot welding is the most preferred and widely used method for joining metal sheets in automotive and many other industrial assembly operations. The body of a car is typically joined by thousands of spot welds. One of the many geometrical factors affecting the final geometrical outcome of the metal part assemblies is the welding process considering welding sequence used when the parts are welded together. The spot welds guarantee the strength of the car, but their positions also affect the geometrical quality of subassemblies and the final product. In practice, the positions of the weld points often deviate from nominal position. By analyzing industrial scanning data, deviations of spot weld positions are found to be of magnitudes up to 19 mm. In this paper, the influence of variation in position of spot welds is investigated with respect to geometrical quality, by simulating and analyzing the geometrical variation of an A-pillar assembly.

Physical and Geometrical Quality of X2CrNi18-9 Stainless Steel Surfaces Cut with Abrasive Waterjet - Work Hardening of Marginal Layer

2015 ◽  
Vol 1111 ◽  
pp. 7-12
Author(s):  
Ion Aurel Perianu ◽  
Ion Mitelea ◽  
Viorel Aurel Şerban
Keyword(s):  
Stainless Steel ◽  
Work Hardening ◽  
Water Pressure ◽  
Optical Microscope ◽  
Abrasive Waterjet ◽  
Technological Parameters ◽  
Geometrical Quality ◽  
Inner Diameter ◽  
Steel Surfaces

This study presents investigations regarding processing X2CrNi18-9 stainless steel sheet with 2 mm thickness using abrasive waterjet cutting.By variation of base technological parameters (water pressure, travelling speed, abrasive rate and focusing tube inner diameter) the shape together with size of the kerf were analyzed.Roughness measurements from the entrance to exit of cut surfaces in correlation with the analysis carried out using an optical microscope highlights work hardening of the marginal layer. This phenomenon is less accentuated in the higher area which is in the vicinity of the focusing tube and intensifies towards the lower area of cut material.

scholarly journals Integrated Tolerance and Fixture Layout Design for Compliant Sheet Metal Assemblies

2021 ◽  
Vol 11 (4) ◽  
pp. 1646
Author(s):  
Abolfazl Rezaei Aderiani ◽  
Martin Hallmann ◽  
Kristina Wärmefjord ◽  
Benjamin Schleich ◽  
Rikard Söderberg ◽  
...  
Keyword(s):  
Production Cost ◽  
Integrated Design ◽  
Integrated Approach ◽  
Design And Optimization ◽  
Simulation Tools ◽  
Geometrical Quality ◽  
Compliant Assembly ◽  
Evolutionary Optimization Algorithms ◽  
Independent Design

Part tolerances and fixture layouts are two pivotal factors in the geometrical quality of a compliant assembly. The independent design and optimization of these factors for compliant assemblies have been thoroughly studied. However, this paper presents the dependency of these factors and, consequently, the demand for an integrated design of them. A method is developed in order to address this issue by utilizing compliant variation simulation tools and evolutionary optimization algorithms. Thereby, integrated and non-integrated optimization of the tolerances and fixture layouts are conducted for an industrial sample case. The objective of this optimization is defined as minimizing the production cost while fulfilling the geometrical requirements. The results evidence the superiority of the integrated approach to the non-integrated in terms of the production cost and geometrical quality of the assemblies.

scholarly journals Supporting the decision during inter-operational inspection of the electrodes based on the ensemble of neural networks

Mechanik ◽  
2018 ◽  
Vol 91 (12) ◽  
pp. 1060-1063
Author(s):  
Halina Nieciąg ◽  
Rafał Kudelski ◽  
Krzysztof Zagórski
Keyword(s):  
Neural Networks ◽  
Flexible Manufacturing ◽  
Electro Discharge Machining ◽  
Tool Monitoring ◽  
Geometrical Quality ◽  
The Neural Networks ◽  
Physical Phenomena ◽  
Random Nature ◽  
Edm Process

In this paper the method based on the ensemble of artificial neural networks is presented for prediction of the geometrical quality of workpieces after electro-discharge machining (EDM). The complexity and random nature of physical phenomena accompanying the EDM process excluded the theoretical ways. The working electrodes were measured using CMM in flexible manufacturing system. The data obtained from inter-operational measurements were used for the neural networks training. Commonly used measures to express the tool wear turn out to be useless due to their large uncertainty. The tool monitoring and the ensemble method provided more stable diagnosis of the condition of the tool.

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