Interview: Johan Nygren

Publicerad 2019-06-19

Johan Nygren is a new PhD student at the Centre for ECO² Vehicle Design, starting January 2019. We asked Johan some questions on his research at the centre.

1. What is your research project?

I’m investigating sustainable transport, focusing on vehicle noise, the noise that arises from the whole vehicle and that has impact on the environment. There are several components on a vehicle that can generate noise, such as the wheels and the surface they are in contact with, air inlets, the engine and so on. I would like to look at all these different noise sources. One goal is also to investigate how vehicle noise interact with other aspects on transport, the least energy demanding route might not be the one with least noise, driver behaviour interacts with speed limitations, geo-fencing etc. Different vehicles perform in different ways and have different characteristics, a truck sounds different from a passenger car. I would like to think of noise as any other kind of pollution.

2. To which concrete problems could your research be applied?

The research could contribute to an increased understanding of how different aspect on noise from individual vehicles interact on a systems level. Noise in urban districts is an important problem today. A model describing how different vehicles sound could be used to analyse different environments and driving conditions. It could also show how a certain arrangement or use of technology could diminish noise. Better decision making could therefore be an application. There are some complications with current noise models that I hope to improve with my research.

3. How is the research performed?

The idea is to work experimentally with data rather than just mere numerical calculations. Full vehicle noise is part of a greater system and it’s hard to use part components to build up the understanding of how the noise emerges. Numerical methods are also powerful and could be used in my research as well. I hope to be able to conduct measurements in urban environments, like carriageways but also test tracks. Different sub-surfaces could be important to use, like surface roughness. In my first poster I suggested research in situ. Hopefully I will be able to make these measurements in collaboration with industry partners to the Centre.

4. Who would be most interested in the results of the research?

Probably those who would like to evaluate changes in driving behavior and vehicle design, both in the industry and in public authorities. We want to aim for a more detailed model that can estimate how a specific vehicle's behavior can impact the noise emissions and in turn how the noise has an effect on the surroundings. We would like to determine the noise from this specific vehicle, in a specific environment, time of day and actual traffic situation. To be able to prove that at vehicle could be less noisy may be a result of great interest for some. You could actually make use in different ways from a model such as this. For example, one could analyze routes both in terms of energy consumption and noise emission.

5. Why do you conduct research and what are your plans after your disputation?

I’ve always had fun learning things and kept on asking ”why?”. During my master studies I was introduced to this field of science and found the application of the theories fascinating. I realized that there were a lot of possibilities for research. My research is a great way for me to have fun in deep diving into the subject and learn more, and perhaps contribute to the subject in the end. I have no specific interest in vehicles, my studies started with Engineering Physics. On the other hand, vehicles are great for applications of different fields of knowledge - and vehicles have effects on us as human beings. If you improve the vehicles it could make a huge impact on society. There is great and positive energy here at KTH so I could not really say no to continue studying here.

Read more on Johan Nygren here  (profile page). You may also contact him by e-mail:

Innehållsansvarig:Håkan Sandberg
Tillhör: ECO2 Vehicle Design
Senast ändrad: 2019-06-19