Acoustics and Noise

Acoustics and noise are important considerations in various engineering and architectural applications. Finite element analysis (FEA) and computational fluid dynamics (CFD) simulations are commonly used to study the behavior of sound waves and their interaction with structures and fluids.

These simulations help engineers and designers understand the propagation of sound, identify noise sources, and develop effective noise control strategies. By using FEA and CFD, it is possible to optimize the acoustic performance of products and systems, leading to quieter and more efficient designs.

Airplane acoustic simulation

Acoustics and noise

Reducing aircraft noise during takeoffs and landings is an important parameter that is being pursued in the aircraft industry. In the next ten years, international organizations have set strict rules for different noise levels in various means of transportation, such as aircraft. These rules can reduce daily flights, reduce flight hours, and even shrink aircraft size. Reducing the noise of aircraft and other flying equipment can help airlines avoid legal action by international bodies.

Numerical modelingIn airplanes, several sources are involved in noise production. An aircraft’s main source of noise is when the engine takes off, but turbulence currents around components such as the landing gear, flap, and wing are equally involved in noise generation during landing.

Because even small geometric details affect the aircraft’s acoustic signature, it is necessary to consider the complete geometric details of the various aircraft components in order to predict the noise accurately. The use of numerical simulation software can perform aircraft noise prediction operations without the need for prototyping and physical testing of equipment.

Vibro-acoustics simulation

Vibro-acoustics simulation involves the study and analysis of the interaction between structural vibrations and the resulting acoustic response. This type of simulation is commonly used in engineering to predict and optimize the noise and vibration characteristics of various systems, such as vehicles, machinery, and consumer products. It can help in designing quieter and more efficient products by identifying and addressing potential noise and vibration issues early in the development process. Do you have specific questions about vibro-acoustics simulation that I can help with?

Numerical modeling

The use of the Lattice Boltzmann solver in the Xflow CFD method can help to stimulate the noise from the turbulence and propagate it to the earth. Developed in the SIMULIA suite of ten years by NASA, the technology can provide more accurate results than older CFD methods in predicting acoustic sources and noise signatures.

Numerical modelingPowerFLOW and PowerACOUSTICS can be used to prepare geometry for noise simulation. PowerFlow software, which has a variety of computational fluid dynamics (CFD) tools, can then be used to calculate the airflow around the aircraft model and the resulting noise.

Then, in the post-processing phase, the noise in the remote areas is analyzed and the effective noise level is calculated. Finally, design engineers can benefit from these results in improving design and geometric modifications.

With the help of numerical simulations, in designing such advanced equipment, without the need to build a prototype, the optimal model can be designed and the necessary modifications applied before construction.

In addition to the fact that each part can be analyzed separately, it is possible to analyze the final assembly sample and determine its noise signature. Experiences gained in aircraft design have shown that by using new numerical modeling methods, noise intensity can be reduced by up to 50%.

NVH-based Design and Considerations

When it comes to designing a product with a focus on NVH (Noise, Vibration, and Harshness), there are several key considerations to keep in mind. First and foremost, understanding the sources of noise and vibration within the system is crucial. This involves analyzing the various components and their interactions to identify potential areas for improvement.

Additionally, selecting appropriate materials and implementing effective damping techniques can help minimize unwanted noise and vibration. Furthermore, integrating NVH considerations into the early stages of the design process can lead to more cost-effective solutions and ultimately result in a better overall product. By prioritizing NVH in the design phase, manufacturers can enhance the user experience and differentiate their products in the market.

Software

Some popular software for acoustics and noise simulation using Finite Element Analysis (FEA) and Computational Fluid Dynamics (CFD) include:

If the design of equipment such as wind turbines, aircraft, home appliances, and other items requires acoustic analysis and noise forecasting, BanuMusa R&D can provide you with a variety of consulting and software services in this field. Get in touch with us.