The Research on Automatic Recognition of Assembly Feature and Converse Parametric Design Method Based on UG

2012 ◽  
Vol 580 ◽  
pp. 87-90
Author(s):  
Bin Fang ◽  
Liang Tian
Keyword(s):  
Parametric Design ◽  
Design Method ◽  
Three Dimensional ◽  
Automatic Recognition ◽  
One Dimension ◽  
Top Down ◽  
Bottom Up ◽  
Assembly Features ◽  
Assembly Feature ◽  
One To One

No matter the bottom-up design mode is adopted or the top-down design is chosen, one-to-one dimension relation can be realized alone among assembly-components in three-dimensional CAD systems.In the paper, a method of automatic recognition is put forward based on assembly features in UG and various definitions as well as expressional methods of assembly features are analyzed. The interrelated dimension relation is established on account of the fit dimension chain. The converse parametric design is realized besides an independent module in UG is developed to achieve the function.

scholarly journals Research on Parametric Design of Hydraulic Retarder Based on Multi-Field Coupling of Heat, Fluid and Solid

2015 ◽  
Vol 9 (1) ◽  
pp. 58-64 ◽  
Author(s):  
Kuiyang Wang ◽  
Jinhua Tang ◽  
Guoqing Li
Keyword(s):  
Numerical Simulation ◽  
Parametric Design ◽  
Design Method ◽  
Three Dimensional ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Field Coupling ◽  
Sequential Coupling ◽  
Fluid Coupling ◽  
Hydraulic Retarder

In order to optimize the design method and improve the performance of hydraulic retarder, the numerical simulation of multi-field coupling of heat, fluid and solid is carried out to hydraulic retarder, based on the numerical computation and algorithm of heat-fluid coupling and fluid-solid coupling. The computation models of heat-fluid coupling and fluid-solid coupling of hydraulic retarder are created. The three dimensional model of hydraulic retarder is established based on CATIA software, and the whole flow passage model of hydraulic retarder is extracted on the basis of the three dimensional model established. Based on the CFD calculation and the finite element numerical simulation, the temperature field, stress field, deformation and stress state are analysised to hydraulic retarder in the state of whole filling when the rotate speed is 1600 r/min. In consideration of rotating centrifugal force, thermal stress and air exciting vibration force of blade surface, by using the sequential coupling method, the flow field characteristics of hydraulic retarder and dynamic characteristics of blade structure are analysised and researched based on multi-field coupling of heat, fluid and solid. These provide the theoretical foundation and references for parametric design of hydraulic retarder.

Parametric Design of Tractor Configuration Using API Based on CATIA

2010 ◽  
Vol 455 ◽  
pp. 411-416
Author(s):  
Ji Shun Li ◽  
L.H. Chen ◽  
L. Li
Keyword(s):  
Parametric Design ◽  
Design Method ◽  
Three Dimensional ◽  
Parametric Representation ◽  
Material Object ◽  
Chain Reactions ◽  
Development Cycle ◽  
Cad Cam ◽  
Key Issues ◽  
Small Change

The traditional shape design method of tractor is mainly completed based on the manual design. Messages are transmited mainly through material object, model, blueprint and template. The material object and model even have a small change that will cause massive chain-reactions such as tedious blueprint revision. And there will be a great many of problem, such as the development cycle of tractor to be long, the accumulative error of design to be big, the development cost to be high and product universalization and serialized degree to be low. This problem is key problem to be solved for shape designer. Advanced design method such as CAD/CAM provid solutions for us, and especially the concept of parametric design was applied. In this paper an appfoach for the parametric design of tractor configuration will be presented. To this end, there are two key issues to be solved: First, the parametric representation of the tractor configuration, second，how to generate a three—dimesional shape of the tractor automatically based on the parametric representation. The parametric design of the tractor configuration is implemented by making use of the API technique of the CAD software，namely automation in CATIA．The test example shows that the approach presented is able to generate a three dimensional shape of the tractor automatically and meet the need of the parametric design of tractor configuration.

Manufacturing of two and three-dimensional micro/nanostructures by integrating optical tweezers with chemical assembly

Robotica ◽  
2005 ◽  
Vol 23 (4) ◽  
pp. 435-439 ◽  
Author(s):  
Kenneth Castelino ◽  
Srinath Satyanarayana ◽  
Metin Sitti
Keyword(s):  
Optical Tweezers ◽  
Manufacturing System ◽  
Three Dimensional ◽  
Inorganic Materials ◽  
Top Down ◽  
Bottom Up ◽  
Complementary Dna ◽  
Nanoscale Manufacturing ◽  
2D And 3D

Optical tweezers have been used as versatile tools for non-contact manipulation of micrometer-sized entities. This paper proposes a hybrid micro/nanoscale manufacturing system using optical tweezers and chemical linkages for fabricating 2D and 3D micro/nanostructures. A holographic multiple trap optical tweezers system is first used to trap particles in a desired pattern. The particles are then connected to form rigid units using suitable chemistry. Connection schemes based on gold seeding, complementary-DNA linkage and streptavidin-biotin chemistry are presented and possible applications of this technique are explored. This method combines the advantages of top-down and bottom-up approaches and is compatible with organic and inorganic materials.

scholarly journals Development of a Parametric Design Method for Various Woven Fabric Structures

2011 ◽  
Vol 6 (4) ◽  
pp. 155892501100600 ◽  
Author(s):  
Sungmin Kim
Keyword(s):  
Parametric Design ◽  
Design Method ◽  
Spline Approximation ◽  
Three Dimensional ◽  
Mapping Method ◽  
Woven Fabric ◽  
Script Language ◽  
Calculation Algorithm ◽  
Three Dimensional Mapping ◽  
Fabric System

An integrated woven fabric system has been developed. A series of parametric design rules have been defined by analyzing famous woven structures. An expandable script language and its compiler have been developed to generate scalable weave diagrams using those rules. A calculation algorithm has also been developed to generate draft and peg plans based on the weave diagrams. Finally, a two-dimensional realistic fabric image rendering function using the actual image of various yarns, a three-dimensional fabric modeling method based on B-Spline approximation, and a pseudo three-dimensional mapping method for simulated images of final products were all integrated into the system.

scholarly journals Parametric Design and Kansei Engineering in Goblet Styling Design

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Fong-Gong Wu ◽  
Chii-Zen Yu
Keyword(s):  
Evaluation Method ◽  
Parametric Design ◽  
Design Method ◽  
Three Dimensional ◽  
Transformation Method ◽  
Market Demand ◽  
Kansei Engineering ◽  
Cam Mechanism ◽  
Projective Curves ◽  
Point Data

In this study, we developed a computer-aided product design method for goblet styling design based on two methods. The first was parametric design derived from an adjustable cam mechanism, which was used for shape generation, and the second was Kansei engineering, which was used for shape evaluation. In the shape generation method, motion curves from an adjustable cam were used. Designers can collect feature point data from existing products to define the boundary conditions of adjustable cam motion equations; furthermore, adjustable motion curves allow parametric design. Through adjusting a single parameter, motion curves were changed to be used as projective curves for the styling design of goblets. Then, a coordinate transformation method was applied to support the three-dimensional styling design of goblets. In the shape evaluation method, some goblet stylings were regularly selected to determine adjective degrees by production design experts. Adjective degrees for goblets that had not been selected were determined through interpolation. Market demand was defined as the preference of customers for specific adjective degrees for goblets.

Aerodynamic Design of Turbomachinery Blading in Three-Dimensional Flow: An Application to Radial Inflow Turbines

1993 ◽  
Vol 115 (3) ◽  
pp. 602-613 ◽  
Author(s):  
Y. L. Yang ◽  
C. S. Tan ◽  
W. R. Hawthorne
Keyword(s):  
Parametric Design ◽  
Design Method ◽  
Three Dimensional ◽  
Inviscid Flow ◽  
Turbine Rotor ◽  
Computational Method ◽  
Navier Stokes ◽  
Design Calculation ◽  
Analysis Tool ◽  
Turbine Wheel

A computational method based on a theory for turbomachinery blading design in three-dimensional inviscid flow is applied to a parametric design study of a radial inflow turbine wheel. As the method requires the specification of swirl distribution, a technique for its smooth generation within the blade region is proposed. Excellent agreements have been obtained between the computed results from this design method and those from direct Euler computations, demonstrating the correspondence and consistency between the two. The computed results indicate the sensitivity of the pressure distribution to a lean in the stacking axis and a minor alteration in the hub/shroud profiles. Analysis based on a Navier–Stokes solver shows no breakdown of flow within the designed blade passage and agreement with that from a design calculation; thus the flow in the designed turbine rotor closely approximates that of an inviscid one. These calculations illustrate the use of a design method coupled to an analysis tool for establishing guidelines and criteria for designing turbomachinery blading.

Visional Attentional Allocation of Top-down and Bottom-up Cues in Three-Dimensional Space

2011 ◽  
Vol 179-180 ◽  
pp. 1322-1326
Author(s):  
Ru Ting Xia
Keyword(s):  
Visual Attention ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Depth Information ◽  
Top Down ◽  
Bottom Up ◽  
Attentional Allocation ◽  
3D Space ◽  
Target Locations ◽  
Three Dimensional Space

The aim of the present experiment was to investigate visual attentional allocation of top-down and bottom-up cues in three-dimensional (3D) space. Near and far stimuli were used by a 3D attention measurement apparatus. Two experiments were conducted in order to examine top-down and bottom-up controls of visual attention. In the experiment 1, the cue about the location of a target by means of location information. In the experiment 2, color cue by brief change of color at target locations was presented. Observers were required to judge whether the target presented nearer than fixation point or further than it. The results in experiment 1 and experiment 2 show that both location and color cue have the effect on reaction time, and that shift of attention were faster from far to near than the reverse. These findings suggest that (1) attention in 3D space might be operated with both location and color controls included the depth information, (2) the shift of visual attention in 3D space has an asymmetric characteristic in depth.

Parametric Design of Tapered End Mills with Variable Pitch for Improving Stability

2014 ◽  
Vol 599-601 ◽  
pp. 381-384
Author(s):  
Li Lun He ◽  
Zhi Bing Liu ◽  
Xi Bin Wang ◽  
Wei Wei Lv
Keyword(s):  
Graphical Representation ◽  
Parametric Design ◽  
Design Method ◽  
Three Dimensional ◽  
Mathematical Expression ◽  
End Mill ◽  
Optimal Angle ◽  
Variable Pitch ◽  
End Mills ◽  
Design And Manufacture

For the problems about design and manufacture of the variable pitch tapered end mills, this study proposes a three-dimensional parametric design method of variable pitch mill. Firstly the equation of calculating the optimal angle between the pitch was presented .Considering existing different patches between two cutting edges, helix edge curve and cross-section groove model of tapered end mill were established .Secondly, mathematical expression of ball end teeth for tapered mill was derived, and all points data of tapered mill surface can be determined by established model. Through the graphical representation, the points set are translated into a solid model.

Prediction of Potential Cracking Failure Modes in Three-Dimensional Airfield Rigid Pavements with Existing Cracks and Flaws

2012 ◽  
Vol 2266 (1) ◽  
pp. 11-19 ◽  
Author(s):  
Francisco Evangelista ◽  
Jeffery R. Roesler ◽  
C. Armando Duarte
Keyword(s):  
Failure Modes ◽  
Concrete Slab ◽  
Three Dimensional ◽  
Fatigue Cracking ◽  
Crack Size ◽  
Concrete Slabs ◽  
Shear Mode ◽  
Generalized Finite Element Method ◽  
Top Down ◽  
Bottom Up

This paper predicts the potential for crack propagation in concrete pavements under aircraft loading given a starter fatigue crack at the bottom of the concrete slab or a surface-initiated shrinkage crack on top of the slab. The generalized finite element method was used to evaluate the stress intensity factors for quarter elliptical cracks placed at the critical top and bottom tensile stress locations. The pavement was loaded with a single triple-dualtandem (TDT) gear and two TDTs accounting for the entire belly gears. When the pavement was loaded with the two TDT gear configuration, the analyses showed significantly higher KI (shear mode) values for surface-initiated cracks than for bottom-initiated cracks for the same crack size. Therefore, concrete slabs with preexisting surface cracks are more likely to exhibit top-down crack growth despite being designed for bottom-up fatigue cracking under certain loading conditions. The theoretical framework allows for improved assessment of the fracture susceptibility of concrete slabs under aircraft loading, specifically the potential for top-down over bottom-up cracking.

Cooperation Design of Target Area for ICF Facility Based on Top-Down Mode

2014 ◽  
Vol 945-949 ◽  
pp. 25-29
Author(s):  
Yuan Li Xu ◽  
Ming Zhi Zhu ◽  
Gang Chen ◽  
Wen Kai Wu ◽  
Xiao Juan Chen ◽  
...  
Keyword(s):  
Parametric Design ◽  
Three Dimensional ◽  
Target Chamber ◽  
Target Area ◽  
National Ignition Facility ◽  
Top Down ◽  
Complex Products ◽  
Laser Driver ◽  
System Engineer ◽  
Design Software

The top-down mode has been widely used in the cooperation design of complex products. It has great advantages over traditional down-up mode for such a complex system as target area for the ICF facility. By taking target area of National Ignition Facility (NIF) for example, this paper will present a process of three-dimensional cooperation design supported by a design platform. The parametric design software Creo (upgraded Pro/E) and PDM software Windchill PDMlink are seamlessly connected in the platform using the floating license. The whole design process of target area was based on top-down mode and driven by the skeleton models. The sub-assembly includes target chamber, beam transport system, and supporting system. The design has been concurrently accomplished by the system engineer and the sub-assembly engineers on the design platform. It has validated the feasibility of the cooperation design based on the top-down mode. It can technically support the realization of the cooperation design for NIF scaled high-power laser driver.

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