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Thesis Work: Development of a Sound Quality Metric for Unsteady Wind Noise

Let's create the future together.

At Volvo Cars, we believe that being curious and truly committed to understanding people is the key to future success. We are people who care about other people, working together to create new technologies and innovations for safe, sustainable and convenient mobility. Want to join us?

 

Background

Conventional metrics such as the A-weighted sound pressure and Articulation Index measured in stationary controlled conditions do not precisely represent the actual human perception to unsteady aeroacoustic noise caused by stochastic flows. Different vehicle designs with rather similar stationary noise signatures often deliver different wind noise customer experiences on-road. Sound Quality Metrics (SQM) and other relative psychoacoustic metrics such as the Effective Perceived Noise Level (EPNL) and the Psychoacoustic Annoyance model (PAmod) have the potential to better represent the actual annoyance perceived by the human ear under both stationary and time-varying flow conditions.

 

Scope

The first step of this project is to understand the flow features involved in real ambient conditions and define which SQM(s) or combined models are able to quantify these dynamic phenomena. At the completion of this step, the candidate should perform a series of wind tunnel measurements of pre-defined SQM(s) under stationary-yawed or dynamic airflow conditions and correlate those results with subjective assessments performed by a group of evaluators. As data will be taken in a non-aeroacoustic environment (PVT), the correlation should be confirmed in a aeroacoustic wind tunnel in a later phase. The objective of this project is to develop a Subjective-correlated Wind Noise SQ Metric to support the development of future Wind Noise requirements in aeroacoustics wind tunnels, increasing the match between objective NVH metrics and effective customer perception.

 

Profile

Required: Good knowledge in Acoustics. Desirable: Psychoacoustics/SQ, DSP, Aerodynamics, Aeroacoustics. Self standing, curious and fast learner. Driving license.

 

Application

CV and point list is needed for application.

 

Duration

Period: Approximately 20 weeks. This diploma work gives 30points.
Starting date: March 2020

Number of students: 1 student.

 

Application
Attach your resume and cover letter stating your interests within the given area and your thoughts and credentials. Please note that applications arriving later then the last application date will not be taken in consideration. Selection will be ongoing during the application period. We want your application as soon as possible, but no later than 2020-01-31. Please note that applications via email will not be accepted.

 

Contact details

Niklas Johansson
 

Email: niklas.c.johansson@volvocars.com

Phone: +46723 717695

 

 

 

Who are we?

Everything we do starts with people. Our purpose is to provide freedom to move, in a personal, sustainable and safe way. We are committed to simplifying our customers’ lives by offering better technology solutions that improve their impact on the world and bringing the most advanced mobility innovations to protect them, their loved ones and the people around them. 


Volvo Cars’ continued success is the result of a collaborative, diverse, and inclusive working environment. The people of Volvo Cars are committed to making a difference in our world. Today, we are one of the most well-known and respected car brands, with over 40,000 employees across the globe. We believe in bringing out the best in each other and harnessing the true power of people. At Volvo Cars your career is designed around your talents and aspirations so you can reach your full potential. Join us on a journey of a lifetime as we create safety, autonomous driving and electrification technologies of tomorrow.

Gothenburg, SE

Job requisition ID:  27119

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