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Acoustics & Vibrations Blog Posts

How to Model an Anechoic Coating

January 5, 2017

Modeling an anechoic coating involves finding the smallest unit cell, truncating the geometry, and analyzing the wave diffration. The COMSOL® software includes predefined interfaces to do so.

How to Use Acoustic Topology Optimization in Your Simulation Studies

November 3, 2016

Today, guest blogger René Christensen of GN Hearing discusses the importance of acoustic topology optimization and how to apply it in COMSOL Multiphysics. Topology optimization is a powerful tool that enables engineers to find optimal solutions to problems related to their applications. Here, we’ll take a closer look at topology optimization as it relates to acoustics and how we optimally distribute acoustic media to obtain a desired response. Several examples will further illustrate the potential of this optimization technique.

Optimizing a Tunable Organ Pipe for Ocean Acoustic Tomography

November 1, 2016

Ocean acoustic tomography systems measure temperature using an acoustic signal that travels between two instruments. These systems often need to cover a broad frequency band with low-frequency signals and require a high-power sound source. One option to achieve these goals is a tunable organ pipe, which balances efficiency and functionality. A researcher at the Advanced Technology Group, Teledyne Marine Systems used simulation to improve his tunable organ pipe design and compared the results to experimental tests.

Efficiently Calculating the Acoustic Transfer Impedance of a Perforate

September 29, 2016

Perforations, in mufflers for example, enable partial sound transmission between chambers as well as in and out of pipes. When simulating perforates, it’s possible to draw and mesh each hole, but this increases the time it takes to solve the model. For a more efficient approach, we can apply a semitransparent boundary. Here, we’ll discuss several techniques for doing so as well as describe a method for computing the transfer impedance of the perforate.

Reduce the Fan Noise of a Turbofan Aeroengine with Simulation

September 26, 2016

The fans in an airplane’s turbofan engine are one of its main sources of noise. In excess, this can cause a range of health problems, including hearing impairment, sleep disturbance, and stress-related illnesses. To optimize the design of turbofan engines to reduce noise pollution and its correlating side effects, you can turn to acoustic modeling. Our jet pipe tutorial model speaks to the benefits of using such an approach.

Evaluating Microphones and Transducers with Simulation

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.

Reducing Motorcycle Engine Noise with Acoustics Modeling

June 2, 2016

When designing motorcycles, noise reduction is a primary area of concern. Loud, poorly designed motorcycles may not meet noise regulations or satisfy customers. As such, there is a need to reduce motorcycle noise by identifying and eliminating its sources. To do so, researchers at Mahindra Two Wheelers, Ltd. turned to acoustics simulation.

Quickly and Accurately Analyze Acoustic Reflections with Apps

May 23, 2016

In various engineering fields, studying acoustic reflection and absorption is an important point of consideration. Simulation is a valuable tool for performing such analyses, helping to better explain how sound waves interact with their surrounding surfaces. Today, we’ll look at how the Application Builder is extending the reach of such simulation capabilities by using the example of acoustic reflections off a water-sediment interface.