Development of compact circular polarized antenna for WLAN application

Matching the polarization in both the transmitter and receiver antennas is important in terms of decreasing transmission losses. The use of circularly polarized antennas presents an attractive solution to achieve this polarization match which allows for more flexibility in the angle between transmitting and receiving antennas, reduces the effect of multipath reflections, enhances weather penetration and allows for the mobility of both the transmitter and the receiver. Compact circularly polarized microstrip antenna with Circular Polarization (CP) property for wireless communication system at 2.45 GHz is presented. Microstrip patch antennas being popular because of light weight, low volume, thin profile configuration which can be made conformal. Wireless communication systems applications circular polarization antenna is placing vital role. In this study it was applied DGS to produce circular polarization. The single fed circular polarized microstrip antenna is etched on a FR4 with dielectric substrate of 4.3 with the height of 1.6 mm. The axial ratio of approximate 2.1 dB and the radiation pattern results prove that the designed antenna meets the CP criteria. The simulated and measured results show a good agreement and the proposed antenna is suitable for WLAN applications

Interoperability between Cooperative Design Modeller and a CAD System: Software Integration versus Data Exchange

The data exchange between Computer-Aided Design (CAD) systems is a crucial issue in concurrent engineering and collaborative design. The paper presents research works and techniques dealing with the interoperability of a Cooperative Design Modeller (CoDeMo), aiming at the integration of product lifecycle knowledge, and a commercial CAD system (CATIA V5). Two kinds of approaches are implemented in the considered case of CAD interoperability for exchanging geometric data, respectively: one is based on a traditional static interface, in which STEP AP203 standard is used; the other is based on a dynamic interface, in which Application Programming Interfaces (API) of the targeted CAD system is adopted. Both approaches should enhance the communication, exchange and sharing of product data between CAD systems for improving concurrent engineering. A comparison between these two approaches is made to show their particular advantages and disadvantages. The development of a translator between the both CAD systems based on each approach has been carried out and evaluated on an assembly case

Interoperability between Cooperative Design Modeller and a CAD System: Software Integration versus Data Exchange

International audienceThe data exchange between Computer-Aided Design (CAD) systems is a crucial issue in concurrent engineering and collaborative design. The paper presents research works and techniques dealing with the interoperability of a Cooperative Design Modeller (CoDeMo), aiming at the integration of product lifecycle knowledge, and a commercial CAD system (CATIA V5). Two kinds of approaches are implemented in the considered case of CAD interoperability for exchanging geometric data, respectively: one is based on a traditional static interface, in which STEP AP203 standard is used; the other is based on a dynamic interface, in which Application Programming Interfaces (API) of the targeted CAD system is adopted. Both approaches should enhance the communication, exchange and sharing of product data between CAD systems for improving concurrent engineering. A comparison between these two approaches is made to show their particular advantages and disadvantages. The development of a translator between the both CAD systems based on each approach has been carried out and evaluated on an assembly case

Enriching Step-Based Product Information Models to Support Product Life-Cycle Activities

The representation and management of product information in its life-cycle requires standardized data exchange protocols. Standard for Exchange of Product Model Data (STEP) is such a standard that has been used widely by the industries. Even though STEP-based product models are well defined and syntactically correct, populating product data according to these models is not easy because they are too big and disorganized. Data exchange specifications (DEXs) and templates provide re-organized information models required in data exchange of specific activities for various businesses. DEXs show us it would be possible to organize STEP-based product models in order to support different engineering activities at various stages of product life-cycle. In this study, STEP-based models are enriched and organized to support two engineering activities: materials information declaration and tolerance analysis. Due to new environmental regulations, the substance and materials information in products have to be screened closely by manufacturing industries. This requires a fast, unambiguous and complete product information exchange between the members of a supply chain. Tolerance analysis activity, on the other hand, is used to verify the functional requirements of an assembly considering the worst case (i.e., maximum and minimum) conditions for the part/assembly dimensions. Another issue with STEP-based product models is that the semantics of product data are represented implicitly. Hence, it is difficult to interpret the semantics of data for different product life-cycle phases for various application domains. OntoSTEP, developed at NIST, provides semantically enriched product models in OWL. In this thesis, we would like to present how to interpret the GD & T specifications in STEP for tolerance analysis by utilizing OntoSTEP

STEP based Finish Machining CAPP system

This research paper presents various methodologies developed in a STEP based Computer Aided Process Planning (CAPP) system named "Finish Machining – CAPP" (FM-CAPP). It is developed to generate automatic process plans for finish machining prismatic parts. It is designed in a modular fashion consisting of three main modules, namely (i) Feature Recognition module (FRM) (ii) Machining Planning Module (MPM) and (iii) Setup Planning Module (SPM). The FRM Module analyses the geometrical and topological information of the inputted part in STEP AP 203/AP214 formats, and generates a text file with full dimensional details of features and machinable volumes. It is then passed on to the MPM for the selection of best suited machining process. Here, the selection is based on a 7 stage elimination strategy considering major manufacturing factors. After machining planning, the task of selecting the best suited setup is implemented in the SPM module. When these tasks are completed, the system generates the process-planning sheet containing the details of feature, finish cut machinable volume, machining processes with the cutting tool/ media, process parameters and the setup required for machining

CAD - CAM data transfer as a part of product life cycle

Dostupnost i raspoloživost pravim i tačnim informacijama danas predstavlja preduslov za lansiranje uspešnog proizvoda na svetsko tržište. Svaka od tih informacija doprineće kreiranju novog i poboljšanog proizvoda u bilo kom segmentu njegovog životnog veka. Ukoliko se radi o računarski podržanoj proizvodnji onda u fazi prenosa podataka sa geometrijskog modela na model izrade prilike za grešku treba svesti na minimum. Veliki broj standarda protokola i zapisa za međusobnu softversku razmenu podataka danas samo potvrđuje kolika se pažnja poklanja ovoj oblasti. S druge strane, krajnji korisnik je uvek u prilici da traži bolja i povoljnija rešenja, sa što manje prilika za grešku, za prenos podataka u konkretnom slučaju. Time svi ulazni zahtevi projektanta bivaju ispunjeni čime proizvod dobija željenu geometriju i kvalitet. To je samo preduslov za njegovu dalju nadogradnju i implementaciju u složene tehničke sisteme da bi nakon toga prešao u narednu fazu svog životnog veka, odnosno eksploataciju i ispunjavanje zahteva krajnjeg korisnika.Availability and accessibility of proper and correct information is a precondition nowadays for launching a successful product to the world market. Every piece of information will help in creating a new and improved product at any segment of its life cycle. If it is a computer aided manufacturing then in the phase of data transfer from the geometrical model to the production model, errors should be minimized. A large number of standards protocols and scripts for the software data exchange confirm how important this area is. On the other hand, the end user is always able to look for better and more favorable solutions, with the least possibility for errors in our case, in data transfer. Thus all the input requirements of the designer are met, giving the product the desired geometry and quality. That is only a precondition for its further development and implementation in the complex technical systems, so that it would pass into the next phase of its life cycle, which is its actual service and fulfillment of end users’ requirements

CAD - CAM data transfer as a part of product life cycle

Dostupnost i raspoloživost pravim i tačnim informacijama danas predstavlja preduslov za lansiranje uspešnog proizvoda na svetsko tržište. Svaka od tih informacija doprineće kreiranju novog i poboljšanog proizvoda u bilo kom segmentu njegovog životnog veka. Ukoliko se radi o računarski podržanoj proizvodnji onda u fazi prenosa podataka sa geometrijskog modela na model izrade prilike za grešku treba svesti na minimum. Veliki broj standarda protokola i zapisa za međusobnu softversku razmenu podataka danas samo potvrđuje kolika se pažnja poklanja ovoj oblasti. S druge strane, krajnji korisnik je uvek u prilici da traži bolja i povoljnija rešenja, sa što manje prilika za grešku, za prenos podataka u konkretnom slučaju. Time svi ulazni zahtevi projektanta bivaju ispunjeni čime proizvod dobija željenu geometriju i kvalitet. To je samo preduslov za njegovu dalju nadogradnju i implementaciju u složene tehničke sisteme da bi nakon toga prešao u narednu fazu svog životnog veka, odnosno eksploataciju i ispunjavanje zahteva krajnjeg korisnika.Availability and accessibility of proper and correct information is a precondition nowadays for launching a successful product to the world market. Every piece of information will help in creating a new and improved product at any segment of its life cycle. If it is a computer aided manufacturing then in the phase of data transfer from the geometrical model to the production model, errors should be minimized. A large number of standards protocols and scripts for the software data exchange confirm how important this area is. On the other hand, the end user is always able to look for better and more favorable solutions, with the least possibility for errors in our case, in data transfer. Thus all the input requirements of the designer are met, giving the product the desired geometry and quality. That is only a precondition for its further development and implementation in the complex technical systems, so that it would pass into the next phase of its life cycle, which is its actual service and fulfillment of end users’ requirements

Interoperability between Cooperative Design Modeller and a CAD System: Software Integration versus Data Exchange

The data exchange between Computer-Aided Design (CAD) systems is a crucial issue in concurrent engineering and collaborative design. The paper presents research works and techniques dealing with the interoperability of a Cooperative Design Modeller (CoDeMo), aiming at the integration of product lifecycle knowledge, and a commercial CAD system (CATIA V5). Two kinds of approaches are implemented in the considered case of CAD interoperability for exchanging geometric data, respectively: one is based on a traditional static interface, in which STEP AP203 standard is used; the other is based on a dynamic interface, in which Application Programming Interfaces (API) of the targeted CAD system is adopted. Both approaches should enhance the communication, exchange and sharing of product data between CAD systems for improving concurrent engineering. A comparison between these two approaches is made to show their particular advantages and disadvantages. The development of a translator between the both CAD systems based on each approach has been carried out and evaluated on an assembly case

Exploring Model-Based Engineering Concepts for Additive Manufacturing

Robust geometry and tolerance representations are needed in additive manufacturing for precise part specification and interoperability with downstream activities such as manufacturing, inspection, and long-term archiving. A disconnection exists between process-independent part geometry and tolerances, and process-dependent information requirements for additive manufacturing. Existing and emerging standards for part geometry (ASTM AMF, 3MF, ISO 10303 STEP) and tolerances (ASME Y14) contain information related to the additive manufacturing process. Details of the standards will be discussed, how their use and improvement can benefit the additive manufacturing process, and their integration into the model-based engineering paradigm.Mechanical Engineerin