Roger Johnsson

Car Ride Before Entering the Lab Increases Precision in Listening Tests

Subjects who are well aware of what to judge commonly yield more consistent results in laboratory listening tests. This awareness may be raised by explicit instructions and training. However, too e ...

Prominence of Different Directions of Hub Forces and Moments in Structure-Borne Tire Noise

In the automotive industry, tire noise is an important factor for the perceived quality of a product. A useful method to address such NVH problems is to combine recordings with measurements and/or ...

Determination of Radiated Sound Power from an Electric Rear Axle Drive In-Situ and its Contribution to Interior Noise

System and component target setting for noise and vibration are important activities within automotive product development. New challenges arise when electric motors are introduced into cars tradit ...

Stud Noise Auralization

During the winter special winter tires are used to prevent the car from slipping and the grip can be improved by using studded tires. Studded tires are known to cause higher noise levels and noise ...

3D Auditory Displays for Parking Assistance Systems

The objective of this study was to investigate if 3D auditory displays could be used to enhance parking assistance systems (PAS). Objective measurements and estimations of workload were used to ass ...

Signal Sound Positioning Alters Driving Performance

Many of the information systems in cars require visual attention, and a way to reduce both visual and cognitive workload could be to use sound. An experiment was designed in order to determine how ...

Simulations and measurements of the dynamic response of a paper machine roller

The paper industry is a highly automated industry that includes many different production steps, in which a variety of machine components are used. In a paper machine, where the pulp is being trans ...

Assessment of changes in automotive sounds caused by displacements of source and listening positions

Artificial head recordings are commonly used to measure and evaluate soundquality. In sound quality assessments, spatial qualities are crucial both forcorrect localization and separation of sources ...