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A New Approach to Optimizing the Clean Side Air Duct Using CFD Techniques

An integrated approach to CFD design optimization is proposed. It consists of taking an initial CAD design, meshing it using HyperMesh, analysing it using Star-CD, parameterising its key features using HyperMorph, and then shape optimizing it using HyperStudy. This approach has been applied here to the shape optimization of the compressor inlet duct of a turbo system.

A Holistic Virtual Design Process Applied to the Development of an Innovative Child Seat Concept

There is a need to minimise product development costs and provide efficient design solutions to maintain competitiveness, so increasingly companies in the Child Restraint System (CRS) industry are turning to Computer Aided Engineering (CAE) to enhance the design and development for their products. Graco has worked with Altair Engineering to develop a group 1 CRS using an advanced CAE driven design process. The design process introduces a number of key phases in the design cycle each of which are positioned to maximize the efficiency of the structure and reduce or remove the cost involved in a traditional, iterative ‘test it and see’ approach.

Development of a Lightweight SUV Frame Concept

The lightweight SUV frame project was a research initiative with the key objective to reduce the baseline frame structure's mass by 25% by applying concept design optimization upfront.

mmWave Axial Choke Horn Antenna with Lens

Millimeter wave (mmWave) antennas operate in the band of frequencies where the wavelength is between 10mm and 1mm. The frequency range for mmWave application is thus constrained to be greater than 30 GHz, but less than 300 GHz. Various applications exist in this frequency range, including wide band telecommunication and imaging applications for security screening. This white paper demonstrates how an antenna was designed for communication at 60 GHz.

At the origins of delamination stresses - Free edge analysis gives insight

When you make a tensile test for [±45/0/90]s and [90/±45/0]s laminates you may observe different failure strengths. This may seem first surprising since the laminates are basically the same - only the stacking sequence is different, which should not influence on the in-plane values.

Bowtie Antenna

This paper illustrates that FEKO can be applied to the simulation of planar antennas with bowtie antennas as an example.

Design Optimization Of A Composite Car Body

This paper describes how a carbon fiber reinforced plastic body of a future city car was optimized to minimize weight. The frame includes numerous parts, some of which have a simple constant laminate structure and some are more complex having additional local reinforcements. The body must meet the different stiffness and load carrying constraints set by the various load cases.

PROBABILISTIC LAMINATE ANALYSIS USING ESACOMP SOFTWARE

Engineering design problems include always uncertainties such as variation in material properties or environment, incomplete statistical data to generate input, modelling and human errors. Yet, the design in general relies on single numbers obtained from engineering equations. In case of strength prediction the material strength is derived using statistical methods and the uncertainties is included in the design value (A or B-value).

FEKO for Rotorcraft

FEKO is well-suited for rotorcraft electromagnetic applications including antenna placement, rotor blade modulation, co-site interference, electromagnetic interference (EMI), electromagnetic compatibility (EMC) and radar cross section (RCS).

Reflector Antenna with Circular Horn Feed — Analyzed with Ray Launching Geometrical Optics (RL-GO)

FEKO includes several computational methods for the efficient analysis of different antenna types. Here, a large problem is solved with the full-wave and asymptotic methods. Model decomposition is used to simulate the problem more efficiently.

Antenna Design Methodology for Smartwatch Applications

Smart devices have touched and enhanced all aspects of our lives, from the way we conduct business to the way we relax at the end of the day. Designing antennas for wearble devices presents a unique set of challenges. In this technical article from Microwave Journal, these issues are discussed.

Designing an LTE Base Station Antenna with the Finite Arrays Method

This white paper demonstrates how an LTE base station antenna may be modeled with the finite arrays (DGFM) method in FEKO.

Modeling of a Magic Tee Waveguide Coupler

A short depiction of FEKO‘s waveguide capability with a magic T coupler as example.

Defence or Civil Radar – it’s a Matter of Wave Propagation

Radar development was essentially motivated by military needs during the second world war, where radar use founded dozens of applications for instance navigation, aircraft location, enemy ship detection, anti-collision, and weather forecast. This white paper discusses the design challenges faced and the solutions available.

Design and Analysis of a Proximity Fuse Antenna for an Air Defence Missile

This white paper is an example of how Antenna Magus can be used to generate antennas for antenna placement studies in FEKO.

ADAS Simulation Under Severe Vibrations

Automotive radars are becoming standard equipment on vehicles. Their purpose is to adjust the distance between vehicles and/or alert the driver when dangerous situations arise. Several antenna architectures are used to cover the different safety functions in complex bumper/car chassis environment where the side effects become more and more significant on the radar performances. Hence, automotive radar integration process becomes a very important topic. Weak radar integration will generate gain loss, high side lobes levels and angular errors. Those degradations will impact the radar range, the main radar axis (BSE) and the radar detection quality (resolution, ambiguity, discrimination).

mmWave Substrate Lens Antenna for Wire Communications

Wu et. al. [1] proposed designs for both single and multi-beam mmWave circularly polarized substrate lens antennas in 2001. This white paper demonstrates these designs via FEKO modeling.

Two Arm Spiral Antenna

A two-arm self-complementary archimedean spiral antenna is modelled in FEKO to determine its wideband behaviour.

Microstrip Bandpass Filter

A microstrip bandpass filter is modeled in FEKO to determine its S-parameters.

Using Experimental Test Data In The Analysis Of Laminated Structures

Composite material systems have relatively large variation in their measured properties. A typical approach in engineering problems is deterministic, however. Material stiffness and strength, for example, are described with single values in linear-elastic analyses. Physical dimensions of the material, structural and environmental conditions in the laminate or uncertainties in material properties, for instance, require that several discrete definitions are needed for the material specification.

MRI Birdcage Coil Design

An application note on the modelling of a 7T MRI birdcage headcoil in FEKO.

Engineering oriented formulation for laminate lay-up optimization

The concept of elementary laminates is used to formulate the design problem for a laminated composite structure. A parameterized laminate is divided into stacks with periodic patterns of elementary laminates. With elementary laminates desired regularity for the laminate lay-ups is achieved, which is practical for multi-layer laminates. Due to the reduced design space solution time can be considerably reduced. Two laminate lay-up formulation concepts are presented and their performance is evaluated. The design problem used as a reference case involved the optimization of the stacking sequences to maximize plate buckling loads using a genetic algorithm.

A Thin, Low-Profile Antenna Using a Novel High Impedance Ground Plane

The size of the antenna for a given application does not depend purely on the technology but on the laws of physics where the antenna size with respect to the wavelength has the predominant influence on the radiation characteristics.

Automotive Radars - Antenna Design, Integration & Channel Modeling

One of the key enabling technologies in the development of autonomous vehicles is driving aid radar systems. We will highlight some of the typical challenges experienced during the design and integration of automotive radars, as well as the applicable numerical solutions that FEKO offers. Radar channel modelling with WinProp is also presented.

Anisogrid Payload Adaptor Structure For Vega Launcher

In the framework of a development project promoted by the European Space Agency (ESA/ESTEC), Airbus Defence & Space (EADS CASA Espacio, ECE) has designed, manufactured and tested a technology demonstrator representative of the payload adaptor (PLA) of VEGA Launcher, by using an anisogrid concept, called anisogrid payload adaptor (APA).

Modern organic architecture with ESAComp

ESAComp software used for the preliminary laminate analysis, to evaluate the structural component behaviour along with the development of the joint system in the Varna Regional Library

Preliminary design of a wing spar bonded joint PrintE-mail

Fast tools such as the ESAComp module for bonded joints can be very efficient in the preliminary design of various joint configurations. In this example we consider a tip loaded wing of a small aircraft or wind turbine blade. The wing spar carries a constant in-plane shear (Nxy), which needs to be transferred from the joint laminates to the shear web.

Horn-Fed Reflector Antenna

A horn-fed parabolic reflector is modeled in FEKO to determine its radiation pattern.

Metamaterials in FEKO

A description of how metamaterials may be modeled in FEKO followed by guidelines regarding the different simulation options.

Considering large deflections in panels - ESAComp 4.4 introduces nonlinear analysis

In composite panels with large support spans, deflections are primarily due to bending. Out-of-plane shear can also play a significant role in sandwich structures. While these deformation types are considered in the typically used linear static analyses, the results are not accurate when going beyond the small deflections regime. When a panel is firmly fixed at its edges, it starts to carry loads partly like a membrane already at low load levels. The panel exhibits stress stiffening. Consequently, with an appropriate analysis approach more efficient structures can be designed.

Transverse shear in Laminate Analysis

This paper describes the method for transverse shear analysis to be applied in the composites design program ESAComp. The correlation of the method to the formulations used in the commercial finite element programs is presented and the results from the selected method are compared to the exact elasticity results. The results show good agreement with the exact solutions for cross-ply and unsymmetric angle-ply laminates. Symmetric angle-ply laminates create bending twisting coupling that the theory cannot accurately model.

Numerical Methods in FEKO

FEKO offers a wide spectrum of numerical methods and hybridizations, each suitable to a specific range of applications. Hybridization of numerical methods allows large and complex EM problems to be solved.

Cobot, the Collaborative Robot - Get Ready for Industry 4.0

Development tools and methods, such as simulation, are increasingly important to face and address the pressure of innovation. As an example, for successful new design methods and to show how simulation tools are used, Altair developed a virtual demonstrator based on a cobot application. This complex machine interacts with a human operator as the ultimate smart manufacturing equipment - to show how challenges in modern product design can be overcome.

Resource Scaling for Antenna Placement Modeling on a SAAB JAS-39 Gripen Aircraft

This white paper demonstrates how resource requirements scale for the computational electromagnetic modeling of a modern fighter aircraft when the frequency increases. It also demonstrates how different simulation methods may be applied and how they scal relative to each other

Probe-Fed Stacked Annular Ring Antenna

This example illustrates how a probe fed stacked annular ring antenna may be simulated in FEKO.

Pressure vessels: The composite solution from ComposicaD and ESAComp

With composite pressure vessels foreseen as a significant industrial growth sector, Mike Skinner, from Seifert and Skinner & Associates, talks us through their approach and how the composite solution offered by ComposicaD and ESAComp provides efficient design and analysis to meet the emerging markets.

Modeling & Analysis of Anechoic Chambers

A white paper demonstrating how FEKO models were used during the design stages of an anechoic chamber that operates in UHF ranges.

Cable Harness EMC/EMI: Cross Talk, Radiation, Interference & Susceptibility

Bundles of electrical cables in vehicles, aircraft, ships and buildings pose electromagnetic compatibility and interference challenges to the electrical design engineer. Due to their lengths, they are more likely to radiate or pick up irradiation than many other electrical components and systems. Through several examples, this white paper will discuss how those challenges can be met with the aid of electromagnetic simulation.

CFRP Electronics Housing for a Satellite (ESA 2005)

The drive for continuous mass reductions in spacecraft structures has promoted the use of carbon fibre reinforced plastics. CFRP has excellent specific stiffness and strength, which makes it possible to construct lightweight structures. CFRP is typically used in applications where electrical, thermal and radiation protection properties are not decisive.

ESAComp meets challenging marine applications

In this article we learn about ESAComp's role in the design-development of a carbon composite RIB "Rigid-hulled Inflatable Boat", the latest project from Dr. Luca Olivari, a naval architect, founder and owner of the Italian company Olivari Composites Engineering.

Radar Cross Section of Aircraft with Engine Inlets

At radar frequencies, 1GHz and above, asymptotic methods are usually preferred to calculate the radar cross section (RCS) of targets like aircraft, since the main parts of the target are more than an order of magnitude larger than the wavelength. The challenge is how to combine these methods to compute the RCS. In this white paper the two-step method that obtains accurate results in limited time is detailed.

Cassegrain and Gregorian Reflector Antenna Modeling with MLFMM LE-PO Hybrid Solvers

This white paper demonstrates that the MLFMM-LE-PO hybrid formulation is a very efficient and accurate method for analysis of large reflector antennas.

Conformal Multi-Band Patch Antenna

Simulating the Planar and Curved Antennas in FEKO

Radar Cross Section (RCS) Measurement and Simulation of Generic Simple Shapes

RCS targets including the NASA almond, ogive, double-ogive, cone-sphere and cone-sphere with gap were constructed and the RCS was simulated. Simulation data is compared to measured data in open literature.

How to use FEKO with HyperMesh

This document applies to FEKO 14.0 and HyperMesh 14.0. Users who would like to make use of the benefits of the advanced meshing features of HyperMesh while solving the electromagnetic aspects of the problem in FEKO, have several options to transfer the mesh from HyperMesh to CADFEKO. This document provides the recommended options and a brief description of how to complete the model setup in CADFEKO.

Design-Optimization Of Cylindrical, Layered Composite Structures Using Efficient Laminate Parameterization

For many years, layered composites have proven essential for the successful design of high-performance space structures, such as launchers or satellites. A generic cylindrical composite structure for a launcher application was optimized with respect to objectives and constraints typical for space applications. The studies included the structural stability, laminate load response and failure analyses. Several types of cylinders (with and without stiffeners) were considered and optimized using different lay-up parameterizations. Results for the best designs are presented and discussed.

Combining Near-Field Measurement and Simulation for EMC Radiation Analysis

Electronic components are required to comply with the global EMC regulations to ensure failure free operation. Currently, EMC measurements in certified institutes are mandatory to certify performance complies with regulations.This paper describes a practical method of combining near-field measurements and simulations to explore the radiation behavior of electronic components.

FACILITIES IN ESACOMP FOR ANALYSIS AND DESIGN OF ADHESIVE BONDED JOINTS

This paper presents a newly developed analysis and design module for adhesive bonded joints implemented in ESAComp, software for analysis and design of composite laminates and laminated structures.

Advanced Radar Cross Section (RCS) Visualization with POSTFEKO and Lua Scripting

This white paper demonstrates how Lua scripts in POSTFEKO may be used to produce advanced visualizations of RCS data that was computed in FEKO.

From Radar Waves to Road Safety

From the moment radar was first invented, it has proved its value in collision avoidance - first at sea, then in the air and later on the road. This white paper gives an overview of the development that has taken place.

A shell facet model for preliminary design of cylindrical composite structures

The laminated composite lay-up design typically involves trade-offs between material selection, thickness of the layer, orientation of the layers, and the stacking sequence. Finding the right structural concept early in the design process leaves resources for the detailed design. Many structural members made of laminated composite materials have the form of thin walled cylindrical shells that are prone to buckling. Thus it is desirable to find structural designs that satisfy global requirements for structural stability early in the design phases. In this work, thin-walled cylindrical composite shells under different loading conditions have been studied for structural stability. The simulation is performed with a shell facet model implemented in the ESAComp software. Preliminary design tools for structural stability of thin-walled cylindrical composite shells are demonstrated and discussed.

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