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Wearable Conformal Antenna Design in Presence of the ANSYS Human Body Model

Figure 4 – Cylindrically Curved Structures of radii 5cm, 7.5cm and 10cm

The Internet of Things has rapidly become a major industry focus with dramatic advancements in low power electronics and in wireless technology. Body-worn communication systems are now capable of detecting body motion during exercise and monitoring functions like heart rate and blood pressure. In such systems, a critical topic is how to preserve antenna performance, while achieving the requirements of small size, light weight, low power, low cost and ease of fabrication. It is also desirable to check how the antenna performance will be affected once brought into contact with the human body. The ANSYS Electronics Desktop is a tool suitable for such design applications. It is user friendly and easy to operate, leading to accurate simulation results. Planar Microstrip Patch Antenna Design in Free…

Developing Power Electronic Products in the ANSYS Electronic Desktop

Magnetic Field within the transformer core and around the winding

The development of power electronics products always relies on transient circuit simulation to evaluate the internal operation of the product and the effect of outside conditions in a wide variety of scenarios. With this design style in mind, circuit simulation has developed to focus on being extremely fast and parametric to allow circuit designers to run hundreds and thousands of iterations on a design per day. However, as product performance reaches ever higher and the design limitations become ever tighter, circuit simulation is starting to lack the accuracy and functionality required to predict the more expensive design metrics. Energy losses due to skin effects, nonlinearities due to saturable magnetics, trace/package coupling due to parasitics and high frequency harmonics due to fast switching semiconductors require detailed…

Error-Free Embedded Software Design as part of a Multiphysics Simulation with ANSYS

SCADE Suite and SCADE Display in the Airbus A380 Cockpit

In the pursuit of ever higher performance, software is taking over a much larger responsibility for the function of the end product than ever before. A particularly dramatic example is the design of inherently unstable aircraft such as the Lockheed F-117 Nighthawk. Without the flight computers making very fine adjustments every millisecond, it would flip upside down and crash with no possibility of recovery by the pilot. This illustrates the pressing need to be able to develop software without errors and extensively test it against both theoretical and practical scenarios without leaving the engineers workstation. Software standards are already in place across a wide variety of industries to provide guidance on developing safety critical software but the actual performance of the device still depends on…

Meshing Fabricated Structures in ANSYS Mechanical using Mesh Edit

Meshing Fabricated Structures in ANSYS Mechanical using Mesh Edit

The introduction of parallel part-by-part meshing to ANSYS Mechanical 15 back in 2013 was revolutionary. Structures which took hours to mesh now wrapped up in minutes, unfortunately removing one of our favourite excuses for taking a tactical nap. One of the limitations to this new feature was the fact that Multibody parts were still meshed in serial. Given that customers in the maritime, aviation and defence industries all utilised Multibody parts to connect shell assemblies, this was a pretty big drawback. Introduced in R16 and refined in R17, ANSYS Inc have introduced a suite of tools focussed on “mesh editing” which work to enhance the workflow associated with meshing and connecting fabricated structures. Over the course of these two releases, a number of new features…

Topological Optimisation with ANSYS 17.0

Utilising the new FREE topology optimisation ACT-extension, one can explore new innovative ways to reduce mass that were not available before. The DoE (Design of Experiments) approach may not be feasible if the design’s shape is not yet defined, while creating CAD models to capture all the potential design possibilities may be impossible. Now imagine starting with an arbitrary volume and having each element within either turned on or off to create the most optimum shape, taking into consideration the applied loads, boundary conditions, and design constraints (such as, a maximum displacement/stress limit required for the design) to achieve an overall weight reduction. In Shape Optimisation, we have constraints and objectives. Constraints define the optimisation’s bounds, while objectives are essentially the goal of the optimisation problem. In the following example, the imposed loadings on the Bell Crank must…

Stabilisation of an Inverted Pendulum using Rigid Body Dynamics

Diagram of an Inverted Pendulum on a cart and its equivalent in ANSYS Mechanical

The inverted pendulum on a cart is a classic control theory problem for demonstrating control of an inherently unstable system. Left to its own devices, an inverted pendulum will always fall away from the centre. The cart is controllable however and can move either left or right in order to stabilise the motion of the pendulum and keep it balanced in the centre. There are many examples of this type of system in engineering from balancing rockets using gimbals to balancing a human being on a Segway. The simplified pendulum model consists of a cart with mass M and propelled by a force F in addition to a mass m at the end of a rod. The carts motion is restricted to only moving in…

Analysing Large Fabricated Structures

Meshed crane model

Cranes and lifting equipment pose a unique problem when considered in a finite element analysis. Their sheer size often prevents users from analysing these structures using regular solid elements. Instead, beam elements must be used to reduce the model to a manageable size. The problem with this approach, however, lies in the process of extracting beam elements from the original solid CAD geometry. Meshing and model solution are other issues which may arise if the wrong tools are chosen for the job. The video below outlines the considerations that should be made when preparing for the analysis of large fabricated structures. Luckily, ANSYS provides advanced solutions to address common issues encountered throughout a typical FE workflow for cranes and lifting equipment.   Geometry Clean-up and…

End to End System Design with ANSYS – An Electric Guitar Example

Simplified Guitar Model in ANSYS SpaceClaim

The world of music is dominated by nonlinear devices. From the wood construction of a guitar neck to the neodymium drivers in PA speakers, every device in the chain has a nonlinear response and these are often exploited to produce a unique sound. To predict with certainty how changes to individual components are going to change the performance of the overall system and therefore the tone generated, we need to consider an entire system. The Fender Stratocaster is a renowned instrument in the industry densely populated in options. The body, neck, and fretboard are all constructed from different varieties of wood which changes the response and tonality of the guitar body. The construction and materials used in the magnetic pickups also has a major impact…

Reduced Order Modelling for System Simulation with ANSYS Simplorer

model of a pipe with three circular heating elements

In a previous blog post, we explored the overall capabilities of ANSYS Simplorer. In this post we will be focusing on Reduced Order Modelling (ROM), specifically the techniques available within Simplorer. ANSYS has a range of solvers designed to simulate high fidelity models in each of the three main physics areas. When simulating at a System level, most of this detail is not required and could be left out of the overall simulation. For example, a sufficiently detailed model of an electric motor would only need the input voltage/current and the current speed of the motor as inputs and the torque as outputs. It could also be beneficial to add extra inputs such as temperature but knowing the current distribution in the windings or the…

Analysing Composite Structures with ANSYS PrepPost

Material distribution from geometry thickness guide used with foam core

The design and construction of composite structures represents a powerful and lucrative industry that is predicted to grow dramatically as demand increases for the high strength, low weight properties possible with composite materials. Part of the ANSYS Workbench environment, ANSYS Composite PrepPost provides tailored tools for the multitude of composite specific problems that face designers and engineers. This post will provide an overview of features within ANSYS Composite PrepPost, highlighting the benefits it provides to users. Ply Tapering When using shell elements, the creation of variable thickness parts poses great difficulty for traditional layer section definitions. With the use of edge sets in ACP (Pre), varying thicknesses can be easily captured with an intuitive taper angle controlling the drop off of plies from the part…

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