Aided Design Method Research Articles

A framework to enhance urban biodiversity in Egypt, using Animal Aided design method (AAD)

A framework to enhance urban biodiversity in Egypt, using Animal Aided design method (AAD)

Characteristic-Mode-Analysis-Aided Design of Filtering Patch Antennas

A characteristic-mode-analysis (CMA)-aided design method for filtering patch antennas is proposed in this article. The method mainly includes three parts: first, use the theory of characteristic mode (TCM) to analyze the filtering antenna without feed structure (i.e., the radiator) to find the resonant modes in the passband and predict the positions of the inherent radiation nulls, which are then utilized to obtain the suitable size of the radiator and filtering elements; second, use modal analysis to find the best feed position to excite the resonant modes and simultaneously generate the inherent radiation nulls; and third, optimize the filtering antenna to obtain the optimal overall performance. For demonstration, two different types of filtering patch antennas are investigated using the proposed method. It has been shown that the method can truly realize the independent analysis and design of the radiator structure and the feed with the help of characteristic modal analysis, making the design process of both filtering antennas clearer and more efficient. In addition, the proposed method can find out and fully utilize the inherent radiation nulls, including the modal nulls and the nonmodal nulls of the radiator itself.

Creation and comparison of three-dimensional models of a mechanical part in agriculture field by forward and reverse engineering

In the last 30 years, we often hear about the computer aided design method with the help of the developments in adapting the innovations in the field of computer to the field of design. This method is divided into two sub-methods as forward and reverse. In this study, two methods were applied and compared for a combine harvester part used in the agriculture field. In the reverse engineering method, part was scanned with the laser scanner and the resulting point clouds were made into a mesh structure. These network structures have been improved and optimized with the necessary steps. Then the solid model was created with optimized mesh. In the forward engineering method, a 1/1 scale solid model of the part was created with the help of a caliper. The accuracy analysis of the solid model created with the network model was performed and the deviations from the real values were calculated and interpreted. At the end of the study, the three-dimensional models created by both methods were compared morphologically and the results were evaluated. The average accuracy value between the two models was calculated as 98.24%.

Simplified Model and Simulation Analysis of Ferrite Hollow Bead Coating Based on Computer Aided Design Method

When ferrite hollow beads were made into coating materials, because ferrite hollow beads had hollow internal structure and conductive and magnetic ball wall, ferrite hollow beads have typical resonant ball characteristics in structure. The absorbing coating composed of numerous ferrite hollow beads could be considered as a resonant absorber. With the rapid development of information technology, especially computer technology, the introduction of computer simulation technology can often save experimental costs and reduce the blindness of experiments. Therefore, in order to comply with this development trend, this chapter will establish the absorber model of ferrite hollow bead coating based on HFSS (high frequency simulator structure) electromagnetic simulation software, and qualitatively analyze the relationship between the thickness of ferrite hollow bead coating and the resonant frequency of absorber and the distribution state of electromagnetic field inside the coating through the of computer simulation software.

Research on Architecture Aided Design Methods and System Based on Deep Learning

The utilization of deep learning in the field of building aided design has broad space and potential, especially to improve the perfection of architectural design, the visualization of functionality, the construction progress and the construction cost. Based on this, this paper first analyses the concept and connotation of deep learning, then studies the utilization value of deep learning in building aided design, and finally gives the utilization strategies and meanss of deep learning in building aided design.

Machine learning aided design of conformal cooling channels for injection molding

During the injection molding process, the cooling process represents the largest portion of the cycle time. The effectiveness of the cooling system significantly affects the production efficiency and part quality, where it is limited by the conventional cooling channels manufactured by the drilling and casting process. Although the maturing advanced additive manufacturing (AM) technology allows the design and fabrication of complex conformal cooling channels, the temperature variance caused by non-uniform thickness distribution of the part remains unsolved. This issue is caused by the fact that the existing conformal cooling designs do not create the channels conformal to the part thickness distributions. In this work, a machine learning aided design method is proposed to generate cooling systems which conform not only to the part surface but also to the part thickness values. Three commonly used conformal cooling channel topologies including spiral, zig-zag, and porous are selected. A surrogate model is derived for each cooling channel topology to approximate the relationship between the design parameters of the cooling channels, part thickness, and the resulting part surface temperature. Based on the surrogate model, the design parameters of each type of cooling channels are optimized to minimize the part surface temperature variation. At the end of the paper, design cases are studied to validate the effectiveness of the proposed method. Based on the proposed method, much lower temperature variance and a smaller coolant pressure drop are achieved compared with the conventional conformal cooling design.

Simulation Aided Design of Solar-Powered UAV

This paper describes a distributed flight dynamic simulation method. It needs reasonable computing resources, and can be applied in the design process of solar-powered UAV. A flight dynamics model is established based on the Hamilton’s principle, with the simulation model, this paper discussed the flight characteristics of the large aspect ratio flexible solar-powered UAV, and the influence of different design schemes, then proposed a simulation aided design method, which can be used to select design parameters of the solar-powered UAV, it can also provide reference for similar UAV design.

A computer aided design method for car form and its application based on shape parameters

In the early design stage, automotive modeling should both meet the requirements of aesthetics and engineering. Therefore, a vehicle CAD (computer aided design) model that can be easily adjusted by feedbacks is necessary. Based on CE-Bezier surface, this paper presents a set of algorithms for parametric segmentation and fairing surface generation in a car model. This model is defined by a simplified automotive template and relevant control points, shape parameters and segmentation parameters, which can be modified to alter the car form efficiently. With this model and the corresponding adjustment method, more than fifty various vehicle models are established in this research according to different parameters. And two methods for calculating similarity index between car models are constructed, which are suitable for brand design trend analysis and modelling design decision-making.

3D virtual visual plane design method based on ordered point sequence under the influence of COVID-19

The transmission routes of novel coronavirus pneumonia include direct transmission, aerosol transmission and contact transmission. Therefore, the novel coronavirus pneumonia has been spread very quickly. This has a certain impact on the development of graphic design. Graphic design plays an important role in product design. However, the traditional aided design method is too complex, and it is difficult for designers to design works that meet their own needs. In the design of 3D virtual vision graphics, the distance calculation of time series is not accurate. This kind of error will bring some errors to the design of complex curved surface products. In order to measure the similarity of time series effectively, the calculation principle of Euclidean distance and dynamic bending distance is analyzed. Combined with the advantages of these two methods, a new distance calculation method based on morphological fitting is proposed. In this paper, through the research of ordered point sequence, the 3D virtual design method is used to improve the design effect, which has reference value for the design of works that meet the requirements of designers during the popularity of COVID-19.

Ontology based social life cycle assessment for product development

Social life cycle assessment is an important method to assess products’ social impacts throughout their life cycles. There are already some indicators and software to assist conducting social life cycle assessment. However, it is hard for users to share or reuse assessment results because of different application data structures. To resolve this problem, a knowledge-based social life cycle assessment–aided design method is developed in this research. With this method, all elements in the social life cycle assessment process are analyzed and represented as classes, their relationships are described as object properties, and the data structure is represented as data properties to construct an ontology system for social life cycle assessment. Based on the ontology, a social life cycle assessment–aided product development web is developed. According to the data property structure, a bidirectional mapping between database and ontology is realized using JENA and ontology-based data access, which enables the result data to be automatically inputted into ontology individuals. Thus, the result data can be accumulated, shared, and reused among users. A case study with a floor product as well as a user test is carried out to prove the feasibility and usability of the web. The ontology-based social life cycle assessment–aided design method provides users with a new high-efficiency approach, setting the foundation for the intellectualization of life cycle assessment.

Molecular simulation aided design of copolymer thickeners for supercritical CO2 as non-aqueous fracturing fluid

Molecular modeling of CO2-polymer system was established to study the molecular behaviors and intermolecular interaction of copolymers in supercritical carbon dioxide (SC-CO2) by all-atom molecular dynamics (MD) simulation. According to the simulation results, the correlations of the intermolecular interaction with the molecular structure and composition were explored. The effects of intermolecular interactions on the copolymer properties in SC-CO2 were identified. A series of copolymers were synthesized with CO2-philic monomer 3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,10-Heptadecafluorodecyl acrylate (HFDA) and CO2-phobic monomer vinyl n-Octanoate (VOc), vinyl acetate (VAc), vinyl pivalate (VPi), respectively. The solubility and viscosification of the copolymers in SC-CO2 were evaluated by cloud point pressure and relative viscosity measurements. It was found that P(HFDA0.49-co-VAc0.51), which is the most effective thickener among the copolymers, could enhance the viscosity of SC-CO2 by 62 times at 5 wt%. It was suggested that the thickening capability of the copolymers in SC-CO2 may originate from intermolecular cross-links generated by associative groups. Combining the molecular simulation and experiment results, the structure-activity relationships of the copolymers in SC-CO2 were revealed. It is believed that the molecular simulation aided design method for the SC-CO2 copolymer thickener is reliable.

A design method and its CAD prototype system for surface micromachined MEMS devices

Now the MEMS design method of “bottom–up” (mask-to-shape-to-function) has been adopted widely. However, it is complicated, time-consuming and not straightforward and can’t meet the demand of MEMS development. In this paper, a 3D MEMS aided design method is studied for surface micromachined MEMS devices, which adopts the design procedure of function-to-shape-to-mask. With this method, 3D geometric models of surface micromachined MEMS devices are built by selecting 3D MEMS features from the developed feature database after functional requirement analysis and concept design have been made. After the geometric model is analyzed with FEM analysis tools, 2D candidate masks and process flow are automatically generated by analyzing geometric information and material information of the model. Meanwhile, a 3D MEMS CAD prototype system of this method is developed based on SolidWorks. Finally a torsional micromirror is designed to verify the validity of the design method and its CAD prototype system. The practical example shows that 3D MEMS design method can help designers develop MEMS devices straightforwardly and obtain 2D masks and process flow automatically, and the developed 3D MEMS CAD prototype system based on SolidWorks can make MEMS device design easily.

Komputerowe metody wspomagania projektowania procesu technologicznego

The article presents the computer aided design methods as applied for arrangement of production processes in the range from the simplest to the most advanced ones. The idea behind the research procedure as conducted by the author was to develop a method, models and expert system that would resemble a human expert in the field. This goal was achieved using neural networks.

A Fast Computer Aided Design Method for Filters

This paper presents a fast computer aided design method for filters based on model correction technique. Through the simulation of the submodels, the fitting formulas between the structure sizes and the coefficients can be determined. By pre-approved fitting formulas, the iterative correction is carried out on the filter structure sizes until the performance meets the specification. A design example is provided to explain the whole procedures. Simulation results agree well with the theoretical synthesis results which confirm the validity of the proposed method.

Development of Helical Teethed Involute Gear Meshed with a Multi-Edge Cutting Tool Using a Mixed Gear Teeth Modeling Method

Gearing studies, gear-manufacturing simulations or FEM analysis are nowadays performed mostly in virtual environment. Basically, studies in virtual environment require models, in present cases gear models. The reliability of the results of further studies requires gear models that are built with an adequate precision, and in a shortest possible time too. A shorter modeling time allows numerous rebuilds caused by different parameter changes, profile displacements, tool profile changes or even manufacturing error simulations. Our final goal is to develop a new, simplified gear model generating method, based on the relative movements of the tool(s) and work piece. The generating procedure proposed in the present paper makes possible instantaneous modification of the cutting tool or manufacturing motions without of the use of complicated mathematical formulae – still ensuring a satisfying precision. This pure Computer Aided Design method is intended to work much faster than other usually used gear modeling methods, with a sufficient precision which can be used for any intended further technical or scientific purpose. The authors have developed a points cloud generating and filtering method based on Alpha Shape filtering algorithm. The generating algorithm was completed with arbitrary chosen feed type motions. The initial algorithm was optimized for a faster generating time, with the keeping of the imposed precision. The developed method was used to generate the asymmetrical tooth structure of a helical teethed cylindrical gear.

Color Module Computer Aided Design in Indoor Environment

In this study, a comprehensive solution set of strategies is proposed for interior color design. Computer aided design methods are utilized to solve the problems in the color scheme process, the existing circumstances, shortage and trend of current color scheme tools are analyzed based on interior design theory and modern design methodology. The appropriative color space is constructd to redound the process of special color selection，the tone harmonizing tool is built based on architecture exterior design，and the color knowledge database and scheme database are contrived，the rationality of the color scheme method is validated by integrated cases, the effective way of computer aided color design is obtained and this method is applied to the instance of interior design, it provides a key module for the interior design system software. In the design process, the factors are taken such as color space property，color harmonizing effect，color tone classification, material and texture effect, a viable color enactment is provided for modern interior design.

Ubiquitous computer aided design: A broken promise or a Sleeping Beauty?

As a novel computational approach, ubiquitous computing was emerging at the beginning of the 1980s and has reached a rather mature level by now. It assumes that computing can be available anywhere, anytime and in any context due to technological developments, social demands and calm implementations. Over the years, the opportunities of this computing paradigm have been explored and the benefits have been exploited successfully in many application fields. This survey paper addresses ubiquitous computing from the perspective of enabling computer aided design. The specific objectives of the reported survey are to: (i) give an overall account of the current status of ubiquitous computing and technologies, (ii) cast light on how ubiquitous computing has influenced the development of CAD systems, tools, and methods, and (iii) critically investigate future development opportunities of ubiquitous computing enabled computer aided design. First, the paper discusses the principles and typical technologies of ubiquitous computing. Then, the development and spectrum of the so-called standard computer aided design tasks are analyzed from a computational point of view. Afterwards, the already implemented design enabling functionalities are discussed and some additional functional possibilities are considered. The literature provides evidence that ubiquitous computing has not managed to revolutionize the methodologies or the systems of computer aided design so far, though many researchers intensively studied the affordances and the application possibilities of ubiquitous technologies. One reason is that ubiquitous computing technologies had in the last two decades to compete with other kinds of computational technologies, such as high-capacity computing, high-speed networking, immersive virtual reality, knowledge ontologies, smart software agents, mobile communication, etc., which had a much stronger influence on the development of computer aided design methods and systems. In combination with the rather conservative and conventionalist industrial practice of CAD system development and application, this may explain why the ubiquitous computing revolution remained weak in computer aided design. The literature clearly indicates that application of ubiquitous technologies did not lead to radically new functionalities that could have been exploited by the concerned industries. Consequently, it seems to be possible that computer aided design simply steps over the paradigm of ubiquitous computing and expects new functionalities from the emerging new computing paradigms, such as brain–computer interfacing, cyber–physical computing, biological computing, or quantum computing.

Design of Mine Ventilation Systems Based on Artificial Intelligence

Expert systems, or knowledge based systems, are programs in which the answer to a user-posed question is reached by logical or plausible inference rather than strictly by calculation, although calculation routines can form a major part of an expert system. Based on the integration of expert system technology and optimization technology, an intelligent computer aided design method for mine ventilation systems is proposed in this paper. Firstly, the structure and control algorithm of the intelligent design system are explored. Secondly, the knowledge types required for the mine ventilation expert system and the acquiring method of knowledge are discussed. Finally, the inference method of this expert system is put forward.

Aided Design Method on Geophysical Prospecting for Petroleum Based on 3D Visualization

Aided Design Method on Geophysical Prospecting for Petroleum Based on 3D Visualization

3D Aided Design Solution for Integrated Pipe Network of Subway Station

Based on analysis of problems existing in the design process of integrated pip network, the authors put forward the aided design method of converting 2D design drawings to 3D visualization model. Based on the 3D aided design workflow, the solution of 3D aided design is proposed, the kernel contains include: making drawing standard and development of the plug-in, selection and secondary development of 3D platform, report of conflict analysis and optimization design. The key analysis technique is discussed in the end of this paper.