Predict Thermal Drift in Microwave Filters Using Multiphysics Simulation

Caty Fairclough April 11, 2017

Microwave filters can help prevent unwanted frequency components in the output of a microwave transmitter design. However, when the microwave system experiences thermal drift, it can be difficult to achieve high-frequency stability in the filters. To address this issue and improve filter designs, system engineers need to predict the change of the passband frequency caused by thermal expansion. As we’ll see today, one way to achieve this is with multiphysics modeling.

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Bridget Cunningham April 6, 2017

Modeling the propagation of waves from a large vibrating structure can be a challenging task. It requires balancing the reduction of the computational domain’s size with the decrease of reflection at surface boundaries. With the low-reflecting boundary conditions in the COMSOL Multiphysics® software, we can easily reduce our computational domain to a practical size while ensuring accurate simulation results. Today, we illustrate this with the example of modeling wave propagation in rocks under blast loads.

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Caty Fairclough April 3, 2017

People living near waterways can avoid the damaging effects of flooding by building embankments, which can be made safer using bank protection structures. However, factors such as soil pressure, water level fluctuation, and groundwater seepage can cause bank protection structures to deform and eventually collapse. To better understand this issue, researchers modeled a bank protection structure located within the Yangtze River in China, enabling them to predict the structure’s displacement and deformation.

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Caty Fairclough March 31, 2017

When designing multibody systems, interconnected flexible and rigid bodies must be analyzed to see how they are affected by large rotational and translational displacements. While we can achieve this with the Multibody Dynamics Module in the COMSOL Multiphysics® software, we first want to confirm the reliability of the simulation results. Here, we discuss a benchmark model of a four-bar mechanism that helps prove the validity of these multibody dynamics simulations.

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Bridget Cunningham March 28, 2017

Measuring acceleration is important in high-speed dynamics, as velocity, force, and pressure are derived from it. Sensing elements inside accelerometers make it possible to obtain such measurements. As technology advances, these sensor packages must be optimized to handle higher vibrational frequency bandwidths. To accomplish this, researchers tested their novel piezoresistive sensor chip as part of a package design. Their simulation results, which agree well with experimental data, pave the way for optimizing sensor packages to achieve higher bandwidths.

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Bridget Cunningham March 22, 2017

The viscous catenary problem has generated a lot of theoretical and experimental interest in recent years. This is due to the industrial importance of the rich phenomena that occur within it. Using the flexibility of the COMSOL Multiphysics® software, we can gain fundamental insights into complex problems like the viscous catenary problem and determine the validity of the assumptions made in previous analyses.

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Caty Fairclough March 17, 2017

When simulating hearing aids, it’s important to determine how transducers interact with the rest of the system. In some cases, these studies require fully detailed models, increasing their computational cost. One alternative is coupling a lumped parameter transducer model with a multiphysics model representing the whole system. In this blog post, we discuss the example of a Knowles ED-23146 receiver (or miniature loudspeaker) that is connected to a test setup and compare the results to measurement data.

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Bridget Cunningham March 9, 2017

When a superconducting magnet suddenly transitions to a normal state — known as a quench — its coils may overheat. Quench detection and protection systems are often included in the magnets to enable safer operation. For these systems to be effective, it’s important to understand the resulting electrothermal transient phenomena that take place within the magnet. Using numerical simulation, we can develop sophisticated systems that prevent possible disruption effects.

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Caty Fairclough March 6, 2017

One way to design utility boilers with high thermal efficiency is to improve their furnaces — the most important part in their energy conversion process. Studying furnaces in utility boilers requires engineers to account for radiation, which can be difficult to solve for analytically and expensive to study experimentally. As an alternative, we can use the COMSOL Multiphysics® software to analyze radiative heat transfer in utility boiler furnaces and improve their designs.

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Bridget Cunningham March 1, 2017

To provide sufficient support for a rotating shaft or journal, it is important to choose a hydrodynamic bearing design with the right load capacity. If the applied loads are greater than a bearing design can handle, it can cause excessive wear and instability. With the Rotordynamics Module, an add-on product to the COMSOL Multiphysics® software, you can compare the load capacities for different types of hydrodynamic bearings and determine which one is best suited for your particular application.

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Rémi Magnard February 28, 2017

When modeling a structure with beam elements, we don’t use the actual 3D geometry. Instead, we use a line model, which represents the other two dimensions through defining a set of cross-section properties. With the Beam Section Calculator simulation app, we can easily find the properties for a wide range of beam sections from European and American standards. The app also makes it simple to accurately compute the stress distribution for a given set of applied moments and forces.

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