Adding draft angle to -spline and NURBS surfaces

Zhou, Pei; Qian, Wen-Han

doi:10.1016/j.cad.2012.02.010

Cited by 2 publications

(2 citation statements)

References 7 publications

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“…(Adel) [30] The results obtained indicate a very high potential for solar radiation, and an analysis of the slope in all Oman throughout the year is made. (Hüsamettin Bulut 2004) [31] In the study, year-round daily solar radiation in seven provinces in southeastern Anatolia Turkey is referred to in the tests by using at least 14 years of measurement data [32][33][34]. Different situations can be reviewed by adjusting the fan speed in the simulation model, and the airflow characteristics can be determined by rotating the simulation model to evaluate thermal comfort characteristics.…”

Section: Solar Radiationmentioning

confidence: 99%

A Study of the Simulation and Analysis of the Flow Field of Natural Convection for a Container House

Lin

Cheng²

2020

Sustainability

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Natural disasters, such as earthquakes, windstorms, and tsunamis, can occur all over the world, and disasters caused by human factors, such as civil wars, are also a source of major disturbance. The temporary rehousing of the population is a major problem when disasters occur. The installation of the combination house is time consuming, and tents cannot be used in the event of strong rain and wind; therefore, the container house is the most effective way of solving the rehousing problem. Natural ventilation is the main factor affecting the indoor air quality, thermal comfort, and health inside a container house, and solar radiation heat can also affect temperature changes inside. The air flow field inside a dwelling is very complex, and its flow mode is affected by inlet wind speed, inlet temperature, solar radiation heat, and the size of doors and windows, etc. In this paper, the influence of natural ventilation on the ventilation inside container houses is analyzed. Assuming that there is complex fluid motion in the activity space of the container house, it is not easy to use conventional methods to predict the flow rate. Based on the correlation analysis motion between the corresponding internal flow rates, the calculation and application method of flow is simplified from the results of the wind speed coefficient obtained previously. In addition, an analysis of flow characteristics in the container house is made; simulation analysis in the container house is made by carrying out the numerical analysis of several factors, including velocity field and temperature field. The variation state of the temperature of the environment and a numerical variation of the three-dimensional space are obtained by numerical calculation; the standard k-ε turbulence model is adopted to describe the turbulence phenomena of the fluid, and the mathematical model matched by B-spline surface is used for data analysis through the surface algorithm in order to deal with complex simulation data. The research results show that, regarding the influence of natural ventilation on container houses, the ideal relative position of openings includes the combination of asymmetric windows, followed by the central positioning of the door. The four-opening configurations, where better natural ventilation performance can be achieved, are located at different diagonal positions. The average flow velocity vector form, velocity amplitude, radiation temperature distribution, and the effect of the air volume coefficient of temperature change are analyzed. The research results show that the design of container houses can meet the requirements of air flow, such as the energy consumed by the thermal comfort space. Measurements taken over time and algorithms can also check the residents’ indoor natural ventilation and provide health care by the use of various sensors.

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Section: Solar Radiationmentioning

confidence: 99%

A Study of the Simulation and Analysis of the Flow Field of Natural Convection for a Container House

Lin

Cheng²

2020

Sustainability

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“…Schreve [4] used surface control points independent of each other to create a draft angle algorithm of a B-Spline surface, which was applicable to convex surfaces. Zhou et al [5] changed surface control points to the minimum extent to create the draft angle for B-Spline and NURBS surfaces.…”

Section: Introductionmentioning

confidence: 99%

Automatic Recognition and Construction of Draft Angle for Injection Mold Design

Jong¹,

Li²,

Chen³

et al. 2017

JSEA

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In the injection molding process, plastic products are difficult to demold due to friction force between the cavity and products, thus, finished products might be deformed or damaged. Therefore, designers should add a draft angle to the geometric surface of products, which is parallel to the unloading direction, in order to help the products eject smoothly from the cavity. This study uses CAD software as the main architecture to develop the function of automatic draft angle recognition and construction. The study is divided into three stages. First, the geometric features of products are identified in the CAD model by induced algorithm, then the quilts to be added in the draft design are determined and classified. Finally, draft angles are created in different ways according to different surfaces. An algorithm suitable for automatic draft recognition and construction, as well as the constraints of automatic creation of draft angle, is proposed. The feature recognition algorithm of this study can automatically inspect 90% of the surfaces to be drafted, and the automatic creation of draft features can economize 80% of required mouse clicks, thus, effectively increasing draft angle design efficiency, and preventing errors in mold design and manufacturing.

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Adding draft angle to -spline and NURBS surfaces

Cited by 2 publications

References 7 publications

A Study of the Simulation and Analysis of the Flow Field of Natural Convection for a Container House

A Study of the Simulation and Analysis of the Flow Field of Natural Convection for a Container House

Automatic Recognition and Construction of Draft Angle for Injection Mold Design

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