About this online course

Overview

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Course video

Learn how to apply cutting edge knowledge of aeroacoustics in a simple and effective way. You will be able to reliably measure noise in a variety of mechanical systems and develop noise reduction strategies to improve their aerodynamic design and performance.

Over the last few years the field of aeroacoustics has developed rapidly in finding solutions for reducing noise from aircraft, engines, ventilation systems and wind turbines. However, finding the right balance between achieving maximum performance (of mechanical systems such as airplanes, cars, drones, etc.) and lowering their noise output to comply with noise regulations, and ensure people's comfort and health, is a complicated task.

Many companies are nowadays asking for combined aeroacoustic and aerodynamic knowledge and for many engineers it can be difficult to translate complex aeroacoustic theories into practical design applications. In this course you will acquire the latest knowledge and tools that you need to work with in this challenging and continuously evolving field, including aerodynamic design guidelines to maintain or improve machine performance.

You will evaluate how to measure sound and review principles in order to utilize calculations to estimate the sound generated by a variety of mechanical systems. You will develop noise reduction strategies using simulations to understand how to improve the aeroacoustics of potential designs.

Company Benefits
Companies can benefit from new developments in this field in several ways:
- Aircraft and wind turbine manufacturers need nowadays to comply with strict noise regulations imposed by the new targets for year 2050. Their profits depend on how skilfully engineers, like you, can maintain aerodynamic performance within aeroacoustic parameters.
- Being able to cope with multi‑variable design and cross‑talk between disciplines is an asset for future managers. This course focuses on how to translate complex theories into practical rules, to let you develop the problem‑solving attitude that is required to excel.
- You will be exposed to concrete design exercises, which mimic small R&D projects where focus and precision are required to achieve your goal in a limited amount of time.

Apply this knowledge to your own work
After learning the fundamentals of the aeroacoustic sources of noise, you will apply the knowledge gained to practical and industry‑relevant exercises. During the course you will learn how to change the aerodynamic performance of the mechanical system of your choice (an aircraft propeller, a wind turbine, a wing with flap and/or a jet in proximity of a wing) to obtain the required aeroacoustic performance. Additionally, we will explore the basics of aeroacoustic scaling and testing, in order to give you practical design guidelines that you could use in the future.

This course includes special lectures given by leading companies, including Siemens, GRAS Microphones and National Instruments which will cover industrial applications and reference to the requirements of current regulations. You will also gain access to online simulation tools and resources to tailor your formulations to your test-cases, and you will receive personalized advice and feedback from international experts in the field of aeroacoustics.

After taking this course you will be able to:
  • Analyze various aerodynamic mechanisms that generate noise
  • Estimate, analyze and evaluate the sources of noise of different types of mechanical systems
  • Evaluate the aerodynamic and aeroacoustic EU regulations in a mechanical system
  • Design a strategy to work within the aeroacoustic EU regulations without compromising the aerodynamic performance
  • Identify the most important aerodynamic parameters that affect noise generation (including speed and performance of the system, and operating regimes)
  • Analyze and evaluate the scaling rules in wind tunnel applications
  • Evaluate the optimum design and recommend improvements on the original design
  • Apply experimental techniques for noise measurements, including the design of a simple experimental setup for measurements of pressure fluctuations.

Is this course for you?
This course offers career-oriented benefits depending on your professional background and interests:

  1. Professional engineers with an applied background (e.g. mechanical, aerospace, electric, applied physics, mathematics).
    Whether working in the aerospace/aerodynamic/wind energy industry and/or on a specific mechanical system for aerodynamic and aeroacoustic design, this course will be beneficial due to its focus on multi-disciplinary design, which accounts for performance, comfort and low noise footprint. You will benefit from an improved capacity to develop optimal system designs and thus ultimately become more effective in decision‑making within multi‑disciplinary projects.
  2. Young professionals or entrepreneurs interested in the design of mechanical systems with the target of certification or personal development. This course can prove a great addition to your portfolio when considering a spin-off in engineering and mechanics, where technology needs to encompass several disciplines to produce the best solutions.
  3. Students at the MSc/BSc level aiming to enter the world of experimental or numerical aerodynamics/aeroacoustics.
    If you intend to work in the aerospace/propulsion/wind energy industry or you are interested in pursuing a master's degree in aerospace engineering, this course can bridge the gap between aerodynamics and acoustics, with a practical view on the design of a variety of mechanical systems.

Details

Knowledge of the fundamentals of aerodynamic flows is important for an optimal aeroacoustic design. This course will offer coverage of the main principles required to successfully follow the course. Most text books and courses on this topic are either limited to an analytical treatment of relatively simple problems or they focus on operational aspects without a thorough treatment of the physics. However, in this course you will also learn how to develop your own design strategy to operate with realistic mechanical systems.

Industry Example:
Less noise and optimum performance in onshore wind turbine applications
A low noise wind turbine developed by Siemens offers customers high performance at low to medium wind speeds. The model, which includes aerodynamic add-ons to its rotor blades, can be operated at a noise level of 104.9 decibels. To achieve this, the company's engineers worked on the aeroacoustic optimizations of the blades that allowed silent operation of the new turbine. As reported in the company's magazine, this aeroacoustic solution was inspired in nature: "To bring down both the noise and the cost of onshore power, Siemens turbine blade designers have patterned a new design on the model of owl feathers – an approach known as "biomimicry" – that keeps noise levels down and allows greater energy output without exceeding sound thresholds.

Generally, mechanical noise emanating from the gearbox or generator can be suppressed; the dominant source of noise stems from the aerodynamics of the blades themselves. Specifically, it is the trailing edge noise created by turbulence on the outer 25 percent of the blade that Siemens engineers have been working to eliminate.

In an ingenious example of industrial design emulating nature, the serrated blade edge is combined with comb-like teeth to produce a porous trailing edge, reducing noise by over 10 percent compared with the previous industry standard.

While residents in adjacent neighborhoods can thus be spared sound pollution, the new turbine should also give consumers and operators an edge in the market: Beyond the creative engineering of the blade, which allows power output to be preserved in restricted zones such as near residential areas, the optimized generator and a modularized component concept help to bring down the levelized cost of energy (LCoE) for wind power even further."

Sources:
- "New Siemens onshore wind turbine offers less noise at optimum performance"- Wind Power and Renewables Division Siemens AG -
- "Less noise – higher payoff" (Christopher Findlay - Siemens, The Magazine)

Course structure
The course has four modules focusing on fundamental of aeroacoustics, sources of noise in mechanical systems and measurement techniques for pressure fluctuations. Participants will be able to choose examples in different systems depending on their interests or experience. Each module has a workload of approximately six hours. For successful completion of the course and to receive the certificate of completion you should pass at least three regular modules. Regardless of the module choice, the content of all other modules can be accessed even without fully completing their assignments.

Modules
Module 1:

  1. Introduction to sources of noise
  2. Sources of noise in aircraft propellers, wings, jets, wind turbines

Module 2:

  1. Influence of regulating parameters in the noise sources (e.g. speed, rpm, etc.)
  2. Performance and aeroacoustic design
  3. Rules for wind-tunnel scaling

Module 3:

  1. Test case for combined aeroacoustic and aerodynamic design
  2. Evaluation of the performance of the new design proposition

Module 4:

  1. Aeroacoustic measurements, microphone arrays and beamforming
  2. How to setup of a simple experiment for pressure evaluation

Assessment
Each module includes quizzes and exercises. These can vary from straightforward multiple-choice questions to more detailed calculations. Module 3 has a relatively larger assignment which consists of a test case for the optimization of a combined aerodynamic and aeroacoustic design.

Resources
All necessary course materials will be provided online, you do not need to purchase additional books. You will also gain access to online simulation tools and resources to tailor your formulations to your test-cases.


Qualifications

Certificates

If you successfully complete this course you will earn a professional education certificate and you are eligible to receive 2.0 Continuing Education Units (CEUs).

Admission

This course is primarily geared towards working professionals.

Prerequisites:
Knowledge of fundamental aerodynamics and calculus is an asset to the course. However, the course will fill in any gaps of knowledge in physics and basic signal theory.

In order to complete your enrollment you will be asked to upload the following document:

  • a copy of your passport or ID card (no driver's license)

Contact

If you have any questions about this course or the TU Delft online learning environment, please visit our Help & Support page.

Enroll now

  • Start date
    Jan 15, 2019
  • Admission Deadline
    Jan 08, 2019
  • Cost
    € 695
  • Course length
    5 weeks
  • Estimated effort
    3 - 4 hours per week
  • Course code
    AE-NRS01x

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