Product Model Preparation and Processing for Micromanufacturing

2008 ◽  
Vol 8 (2) ◽  
Author(s):  
Chao-Yaug Liao ◽  
Jean-Claude Léon ◽  
Cédric Masclet ◽  
Michel Bouriau ◽  
Patrice L. Baldeck ◽  
...  
Keyword(s):  
Laser Beam ◽  
Computer Aided Design ◽  
Welding Process ◽  
Product Model ◽  
Processing Scheme ◽  
Proposed Model ◽  
Layer Manufacturing ◽  
Manifold Models ◽  
Model Preparation ◽  
Aided Design

Based on the two-photon polymerization technique, an analysis of product shapes is performed so that their digital manufacturing models can be efficiently processed for micromanufacture. To describe microstructures, this analysis shows that nonmanifold models are of interest. These models can be intuitively understood as combinations of wires, surfaces, and volumes. Minimum acceptable wall thickness, wire dimension, and laser density of energy are among the elements justifying this category of models. Taking into account this requirement, a model preparation and processing scheme is proposed that widens the laser beam trajectories with a concept of extended layer manufacturing technique. A tessellation process suited for non-manifold models has been developed for computer-aided design models imported from standard for the exchange of product files. After tessellation, several polyhedral subdomains form a nonmanifold polyhedron. To plan the trajectories of the laser beam, adaptive slicing and global 3D hatching processes as well as a “welding” process (for joining subdomains of different dimensionality) have been combined. Finally, two nonmanifold microstructures are fabricated according to the proposed model preparation and processing scheme.

scholarly journals Feature-based translation of CAD models with macro-parametric approach: issues of feature mapping, persistent naming, and constraint translation

2020 ◽  
Vol 7 (5) ◽  
pp. 603-614 ◽  
Author(s):  
Mutahar Safdar ◽  
Tahir Abbas Jauhar ◽  
Youngki Kim ◽  
Hanra Lee ◽  
Chiho Noh ◽  
...  
Keyword(s):  
Computer Aided Design ◽  
Parametric Approach ◽  
Model Data ◽  
Feature Mapping ◽  
Product Model ◽  
Cad Systems ◽  
Cad System ◽  
Cad Models ◽  
Feature Based ◽  
Aided Design

Abstract Feature-based translation of computer-aided design (CAD) models allows designers to preserve the modeling history as a series of modeling operations. Modeling operations or features contain information that is required to modify CAD models to create different variants. Conventional formats, including the standard for the exchange of product model data or the initial graphics exchange specification, cannot preserve design intent and only geometric models can be exchanged. As a result, it is not possible to modify these models after their exchange. Macro-parametric approach (MPA) is a method for exchanging feature-based CAD models among heterogeneous CAD systems. TransCAD, a CAD system for inter-CAD translation, is based on this approach. Translators based on MPA were implemented and tested for exchange between two commercial CAD systems. The issues found during the test rallies are reported and analyzed in this work. MPA can be further extended to remaining features and constraints for exchange between commercial CAD systems.

Design System Mfk—An Important Step towards an Engineering Workbench

1993 ◽  
Vol 207 (2) ◽  
pp. 105-116 ◽  
Author(s):  
H Meerkamm
Keyword(s):  
Computer Aided Design ◽  
Tolerance Analysis ◽  
Design System ◽  
Product Model ◽  
Cad System ◽  
Knowledge Based ◽  
Different Types ◽  
Analysis Design ◽  
Aided Design ◽  
Production Tolerance

The Design System mfk will support the designer by an object-orientated synthesis of parts and an integrated knowledge-based analysis. An own-product model which is completely independent from the data structure of the used computer aided design (CAD) system contains all necessary information on geometry, technology, function and organization. It allows different types of analysis: design for production, tolerance analysis, cost and stress calculation, repeated component search, etc. Usable for products of higher complexity the Design System can be seen as an approach to an engineering workbench.

scholarly journals Ενοποίηση πληροφοριακών μοντέλων στη διαδικασία ανάπτυξης του προϊόντος

2015 ◽  
Author(s):  
Ελευθέριος Δερμιτζάκης
Keyword(s):  
Computer Aided Design ◽  
Design Structure Matrix ◽  
Structure Model ◽  
Assembly Model ◽  
Product Model ◽  
Cad Systems ◽  
Design Structure ◽  
Computer Aided ◽  
Design Systems ◽  
Aided Design

Η διαδικασία σχεδίασης και ανάπτυξης ενός προϊόντος απαιτεί τη συνεργασία πολλών οργανωτικών μονάδων στις διάφορες δραστηριότητες που απαιτούνται ώστε το τελικό προϊόν να εισαχθεί στην αγορά. Στη διαδικασία σχεδίασης και ανάπτυξης προϊόντων με χρήση υπολογιστή, υπάρχουν πολλοί διαφορετικοί τύποι και εκδόσεις λογισμικών που χρησιμοποιούνται για την υποστήριξη των δραστηριοτήτων και την εκτέλεση των διαδικασιών σχεδιασμού και παραγωγής. Διαφορετικά συστήματα συνήθως χρησιμοποιούν διαφορετικά σχήματα αναπαράστασης πληροφοριών. Αυτό δυσκολεύει την ολοκλήρωση και το καταμερισμό των πληροφοριών στην ομάδα ανάπτυξης ακόμη και μέσα σε μια ενιαία επιχείρηση. Η τεχνολογία μοντελοποίησης σε διαδικασίες σχεδιασμού προϊόντων διαδραμάτισε έναν θεμελιώδη ρόλο στην υποστήριξη της αποτελεσματικής διανομής πληροφοριών και γνώσης.Στην προτεινόμενη έρευνα θα ενοποιηθούν δύο είδη μοντέλων, τα μοντέλα του προϊόντος με τα μοντέλα ροής των εργασιών, ώστε να γίνει μια ολοκλήρωση των πρώτων πέραν των ορίων της παραγωγής και για τα δεύτερα να ανταπεξέλθουν στα προβλήματα που έχουν με την εγκυρότητα δεδομένων.Η εργασία βασίζεται στο μοντέλο CPM-Core Product Model και επικεντρώθηκε στην επέκταση του αρχικού εννοιολογικού μοντέλου του Μοντέλου Ανοικτής Συναρμολόγησης (OAM - Open Assembly Model). Πρώτα υλοποιήθηκε το Ενδιάμεσο Μοντέλο παρέχοντας τις δομές δεδομένων που χρειάζονται για την αποθήκευση των αντικειμένων και στη συνέχεια προχωρά στην υλοποίηση μιας αντικειμενοστραφούς πλατφόρμας ολοκληρώνοντάς το σε Μοντέλο Υλοποίησης.Για την ενοποίηση του μοντέλου ΠΔΣ-Πίνακα Δομής Σχεδίασης (Design structure Model - DSM) και του Μοντέλου Ανοικτής Συναρμολόγησης (Open Assembly Model - OAM/NIST) χρησιμοποιήθηκε ο Πίνακας Δομής Σχεδίασης Συστατικών ο οποίος με τη βοήθεια αλγορίθμων ομαδοποίησης εστιάζει στην εύρεση υποσυνόλων στοιχείων μιας συναρμολόγησης, ελαχιστοποιώντας προβλήματα στην αρχική σχεδίαση (επαναλήψεις και αναδράσεις).Η ενοποίηση των δύο μοντέλων επιτυγχάνεται κάνοντας χρήση της τεχνολογίας αγωγών (pipeline) που χρησιμοποιείται ευρέως στην τεχνολογία λογισμικού. Συγκεκριμένα, η πληροφορία ρέει από το μοντέλο ΟΑΜ στο μοντέλο DSM δημιουργώντας έτσι εικονικούς αγωγούς ροής πληροφορίας από τα στάδια της αρχικής σχεδίασης μέχρι τη συναρμολόγηση του προϊόντος. Η τροφοδότηση πληροφορίας από το ένα μοντέλο στο άλλο απαιτεί βέβαια μετασχηματισμούς δεδομένων που πρέπει να παρέχουν και εννοιολογική και σημασιολογική αναπαράσταση. Το μοντέλο ενοποίησης που προκύπτει (Open Αssembly Model to Design Structure Matrix - OAM2DSM) συνδέει τις δύο αυτές μεθόδους χρησιμοποιώντας το ΟΑΜ/NIST ως μοντέλο διεπαφής μεταξύ των λογισμικών σχεδίασης (Computer Aided Design systems - CAD systems) και του μοντέλου DSM. Η ενοποίηση αυτή:•Υποστηρίζει τη διαδικασία σχεδίασης από τα πρώιμα στάδια της και καθ’ όλη τη διάρκεια του κύκλου ζωής ενός προϊόντος.•Ισχυροποιεί την ενοποίηση συστημάτων σχεδίασης CAD με συστήματα ανάλυσης.•Δίνει μια δυνατότητα πρόβλεψης στη σχεδίαση, συμβάλλοντας έτσι στη μείωση του χρόνου σχεδίασης μιας και εντοπίζονται γρηγορότερα σχεδιαστικές αστοχίες ή λάθη. •Παρέχει ένα ισχυρό πληροφοριακό μοντέλο, ικανό να αποτυπώσει την εξέλιξη της σχεδίασης και τη ροή της πληροφορίας σε όλα της τα στάδια.•Είναι ανεξάρτητη πλατφόρμας σχεδίασης (Απαραίτητη προϋπόθεση είναι το λογισμικό σχεδίασης να υποστηρίζει το πρότυπο ISO10303 STEP).•Προσθέτει στο ΟΑΜ ένα επιπλέον χαρακτηριστικό, αυτό της τμηματικής σχεδίασης μιας και η ομαδοποίηση που προτείνεται στον ΠΔΣ αρχιτεκτονικής (συστατικών) δίνει ομάδες συναρμολογήσεων με ισχυρή αλληλεπίδραση και εξάρτηση. Αυτή η δυνατότητα ισχυροποιεί τη συνεργατική σχεδίαση).

Hybrid realization of fillet weld

2018 ◽  
Vol 37 (4) ◽  
pp. 1315-1327 ◽  
Author(s):  
Václav Kotlan ◽  
Roman Hamar ◽  
Lenka Šroubová ◽  
Ivo Doležel
Keyword(s):  
Laser Beam ◽  
Welding Process ◽  
Physical Parameters ◽  
Additional Material ◽  
Content Type ◽  
Heating And Cooling ◽  
Proposed Model ◽  
Materials Used ◽  
Physical Phenomena ◽  
Welding Processes

Purpose A model of hybrid fillet welding is built and solved. No additional material (welding rod, etc.) is used. Heating of the welded parts is realized by laser beam with induction preheating and/or postheating. The purpose of these operations is to reduce the temperature gradient in welded parts in the course of both heating and cooling, which reduces the resultant hardness of the weld and its neighborhood and also reduces undesirable internal mechanical strains and stresses in material. Design/methodology/approach The complete mathematical model of the combined welding process is presented, taking into account all relevant nonlinearities. The model is then solved numerically by the finite element method. The methodology is illustrated with an example, the results of which are compared with experiment. Findings The proposed model provided satisfactory results even when some subtle phenomena were not taken into account (flow of melt in the pool after irradiation of the laser beam driven by the buoyancy and gravitational forces and evaporation of molten metal and influence of plasma cloud above the irradiated spot). Research limitations/implications Accuracy of the results depends on the accuracy of physical parameters of materials entering the model and their temperature dependencies. These quantities are functions of chemical composition of the materials used, and may more or less differ from the values delivered by manufacturers. Also, the above subtle physical phenomena exhibit stochastic character and their modeling may be accompanied by non-negligible uncertainties. Practical implications The presented model and methodology of its solution may represent a basis for design of welding processes in various branches of industry. Originality/value The model of a complex multiphysics problem (induction-assisted laser welding) provides reasonable results confirmed by experiments.

SPICE MODEL FOR COMPUTER-AIDED DESIGN OF BIOPOTENTIAL AMPLIFIER

2004 ◽  
Vol 16 (03) ◽  
pp. 151-156 ◽  
Author(s):  
YUN-LI LIU ◽  
DONG-LONG LIN ◽  
YUE-DER LIN
Keyword(s):  
Computer Aided Design ◽  
Electrode Impedance ◽  
External Interference ◽  
Proposed Model ◽  
Computer Aided ◽  
Biopotential Amplifier ◽  
Cad Tool ◽  
Power Line Interference ◽  
Aided Design ◽  
Distinct Features

There are many different kinds of biopotential signal. These signals are tiny in amplitude and the measurement is easily corrupted by external interference. For these reasons, the design of high-quality biopotential amplifier is usually an empirical task. To make the design of biopotential amplifier more efficient, this study proposes a simulation model for bioelectric signal measurement such that the design task can be achieved thoroughly by powerful computer-aided design (CAD) tool. The proposed model has two distinct features, one is the simulated biopotential signal is used for the genesis of biosignal, and the other one is the skin-electrode impedance is replaced by its corresponding equivalent circuit, which is a complex RC network. To verify the feasibility of the proposed model, an ECG amplifier is designed in Spice-related CAD tool and is implemented for ECG recording. From the results, the amplifier characteristics agree well between the simulated and the implemented circuit. Besides, the effect due to the commonly encountered power-line interference during biopotential measurement can be reasonably evaluated in the proposed model.

scholarly journals An Efficient ensemble of Brain Tumour Segmentation and Classification using Machine Learning and Deep Learning based Inception Networks

2021 ◽  
Vol 12 (2) ◽  
pp. 987-998
Author(s):  
R. Aruna Kirithika, Et. al.
Keyword(s):  
Deep Learning ◽  
Computer Aided Design ◽  
Tumour Segmentation ◽  
Area Of Interest ◽  
Proposed Model ◽  
Diagnosis And Classification ◽  
Almost All ◽  
Aided Design ◽  
Brain Tumour Segmentation

In recent times, Brain Tumor (BT) has become a common phenomenon affecting almost all age group of people. Identification of this deadly disease using computer tomography, magnetic resonance imaging are very popular now-a-days. Developing a Computer Aided Design (CAD) tool for diagnosis and classification of BT has become vital. This paper focuses on designing a tool for diagnosis and classification of BT using Deep Learning (DL) models, which involves a series of steps via acquiring (CT) image, pre-processing, segmenting and classifying to identify the type of tumor using SIFT with DL based Inception network model. The proposed model uses fuzzy C means algorithm for segmenting area of interest from the BT image acquired. Techniques like Gaussian Naïve Bayes (GNB) and logistic regression (LR) are used for classification processes. To ascertain all the techniques for its efficiency a benchmark dataset was used. The simulation outcome ensured that the performance of the proposed method with maximum sensitivity of 100%, specificity of 97.41% and accuracy of 97.96%.

Development of CAD-to-CAE Model Preparation Technology

2013 ◽  
Vol 459 ◽  
pp. 325-329
Author(s):  
Tetsuyuki Kubota ◽  
Peter Chow
Keyword(s):  
Computer Aided Design ◽  
Preparation Technology ◽  
Topological Information ◽  
3 Dimensional ◽  
3D Cad ◽  
Computer Aided ◽  
Long Time ◽  
Model Preparation ◽  
Solution Accuracy ◽  
Aided Design

This paper explains and demonstrates how to reduce time for preparation of 3-dimensional (3D) geometrical Computer-Aided-Engineering (CAE) model from 3D Computer-Aided-Design (CAD) data. In generally, CAE model preparation is labor intensive and takes long time. Main part of preparation work is simplification of 3D-CAD data to decrease mesh scale and without impacting the solution accuracy. The purpose of this study is to create automatic CAE model preparation technology for reduction of preparation time. In this study, automatic model preparation method is developed by using of geometrical and topological information of 3D-CAD data. Benchmark test is performed to proof the efficiency of the method.

Development of a Welding Protocol for Automated Shipyard Manufacturing Systems

1997 ◽  
Vol 13 (01) ◽  
pp. 48-56
Author(s):  
Joel Milano ◽  
Ben Kassel ◽  
Douglas Mauk
Keyword(s):  
Mass Production ◽  
Computer Aided Design ◽  
Manufacturing Systems ◽  
Computer Integrated Manufacturing ◽  
Production Environment ◽  
Model Data ◽  
Product Model ◽  
Computer Aided ◽  
Close Relationship ◽  
Aided Design

Robotic manufacturing systems have provided improvements in productivity and quality in the automotive and semiconductor industries. Shipbuilding, however, is a one-of-a-kind manufacturing process and as such embodies a completely different set of problems than the mass production environment. The planning for robotics applications in shipbuilding must be done for each unique component and, therefore, must be done efficiently to achieve the benefits of automation. This will require a close relationship between computer-aided design (CAD), computer-aided manufacturing (CAM), computer-integrated manufacturing (CIM), and the manufacturing systems used on the waterfront. One of the major efforts to be performed is the integration of these processes through the timely presentation of information. One of the tools that can be used to integrate these processes is the Standard for the Exchange of Product Model Data (STEP). This paper will identify the relevant components of a STEP applications protocol (AP) for welding which can be applied to shipbuilding and outline the efforts required to bring it into existence.

An extended framework for knowledge modelling and reuse in reverse engineering projects

2018 ◽  
Vol 233 (5) ◽  
pp. 1377-1389 ◽  
Author(s):  
Alexandre Durupt ◽  
Matthieu Bricogne ◽  
Sébastien Remy ◽  
Nadège Troussier ◽  
Harvey Rowson ◽  
...  
Keyword(s):  
Reverse Engineering ◽  
Computer Aided Design ◽  
Use Case ◽  
Knowledge Model ◽  
Product Model ◽  
Knowledge Framework ◽  
The Core ◽  
Aided Design ◽  
Engineering Projects ◽  
Manual Activity

Reverse engineering is when a real part is analysed in detail in order to create a numerical or virtual model. Reverse engineering allows for multiple redesign possibilities, including changes in the material, the shape and the parameters of the part. Reverse engineering is mostly a manual activity for companies and is thus time consuming. Indeed, measurements must be done in scanned files in order to fit sketches on a mesh and to finally rebuild the computer-aided design/bill of material. This manual process is acceptable when reverse engineering is exceptional. But it is considered as a non-value task when reverse engineering is routine. This non-value task could be automated, at least partially. To make it possible, a capitalization of the company’s part catalogue is a necessary step to proceed. The use of this capitalization can then drive the reverse engineering tasks to enable faster redesign possibilities. The aim of this contribution is thus to propose a knowledge model to support reverse engineering activities in order to integrate the reversed parts quickly into the new product’s detailed design. An extended knowledge framework based on the core product model is proposed, and a use case is shown to validate the feasibility of the proposal of the reverse engineering methodology called PHENIX.

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