Part 1: Modeling the Harmonic Excitations of Linear Systems

Walter Frei | August 10, 2016

In many engineering situations, we can assume that excitations on the system of interest and the responses are sinusoidal over time. When this assumption holds, we can use a so-called frequency-domain analysis, which leads to some very efficient solution techniques. Let’s go over a few basic concepts and the conditions under which we can make this assumption, while exploring various solution approaches to take.

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Bridget Paulus | August 9, 2016

We rely on power transformers for everyday tasks, but these devices also create a loud buzzing or humming noise. This sound comes from vibrations in different parts of the transformer and is impossible to eliminate completely. To reduce the noise, a team of engineers at ABB Corporate Research Center simulated the acoustic, electromagnetic, and mechanical behavior in their transformer systems with the COMSOL Multiphysics® software.

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Mateusz Stec | August 4, 2016

Damage occurs in bearings, gears, rails, and cams due to a damage mechanism called contact fatigue. This happens in assemblies when two parts in contact experience a time-dependent contact pressure. When the transferred load is too high, and after numerous load cycles, a piece of the surface material can flake off and leave a small crater. This phenomenon is called spalling or pitting. With the COMSOL Multiphysics® software, we can model contact fatigue and predict failure in these components.

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Aditi Karandikar | August 2, 2016

Acoustic measurements aren’t always accurate due to imperfections in the measurement tools. To limit incorrect results, devices, such as microphones and vibration transducers, have standards that define their allowable margin of error. Meeting these standards is required, but good measurement tools go a step further and keep their error range consistent over time. To create quality devices, research teams at Brüel & Kjær use multiphysics simulation to model their microphone and transducer designs.

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Caty Fairclough | July 29, 2016

Around the world, millions of people lack access to improved sources of drinking water. Pesticides, bacteria, organic matter, and other pollutants can make accessible water unsafe for human consumption. Finding a cost-effective and easy method to purify water is therefore a major global initiative. One possible solution is a nanoparticle biofoam, which may provide an efficient method for generating safe drinking water.

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Kateryna Vyshenska | July 27, 2016

Archimedean spirals are often used in the analysis of inductor coils, spiral heat exchangers, and microfluidic devices. Today, we will demonstrate how to build an Archimedean spiral using analytic equations and their derivatives to define a set of spiral curves. Based on these curves, we will then create a 2D geometry with specific thickness, extruding it to a full 3D geometry.

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Bridget Paulus | August 8, 2016

Imagine a vehicle where you could simply plug in a destination and arrive without ever having to touch the steering wheel. Fully autonomous cars would revolutionize society, benefiting those who already drive and increasing the mobility of those who can’t. While technological advancements have brought us closer to such a reality, there are still many challenges to overcome. Today, we’ll explore the future of autonomous cars and what needs to happen before they can become a viable option.

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Amelia Halliday | August 3, 2016

When you are creating a model, it can sometimes be difficult to keep track of all the parts in the geometry, including the conditions or constraints that apply to each section. This is especially true when dealing with large, complex geometries and multiple physics interfaces. In COMSOL Multiphysics, tools like named selections help maintain your model setup and streamline your workflow. Here’s a look at three tutorial videos demonstrating how to create and utilize Explicit, coordinate-based, Boolean, and adjacent selections.

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Abbie Weingaertner | August 1, 2016

Modern food processing techniques are constantly being analyzed and improved. To evaluate the efficiency of such techniques and the equipment that they utilize, researchers and engineers can turn to simulation tools like COMSOL Multiphysics. Numerical modeling apps are helping to bring this simulation power to a wider audience, accelerating the optimization of such processes along the way. Let’s see how this applies to the analysis of induction heating for food processing.

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Henrik Sönnerlind | July 28, 2016

In the latest version of COMSOL Multiphysics® — version 5.2a — we bring you new features designed to enhance your structural mechanics contact modeling. You can, for instance, simulate objects that stick together once they come in contact (adhesion) as well as those that pull apart (decohesion), including full cohesive-zone modeling. Learn how to address each of these scenarios using the new functionality in COMSOL Multiphysics.

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Bridget Cunningham | July 26, 2016

As technology evolves, the demand for devices with greater features and functionality emerges. Of course, this means that the designs themselves become more intricate and complex. Simulation offers an efficient route to analyzing and optimizing such devices, prompting further industrial innovation along the way. Today, we’ll take a look at how a team from University of Buffalo designed multiphysics models and simulation apps to spread modeling expertise to a broader range of industries.

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