Ultrasonic metal welding is a solid-state bonding process in which metal workpieces are exposed to high-frequency vibrations. It is an effective joining technology with a wide range of industrial applications with its unique advantages. The vibrations of mechanical parts in the machine cause fluctuations in the air pressure, thus causing sound waves to radiate. The […]

Ultrasonic Metal Welding (USMW) is a quite important welding technique, because of the relative low heat this welding process generate, it is used in numerous industrial applications. However, this welding technique have a disadvantage, the welding strength have large variance despite the same values of input machine parameters. Thus, to improve this welding technique more […]

The IHTA park is used as a case study for a lot of the institute´s research on auralisation and visualisation of urban scenes. An audio-visual model of the park already exists, which uses synthesised sounds for the dominant technical transportation sounds, while inserting recorded sounds as background sounds. Hence, a database of recorded background sounds […]

Die Hörbarmachung urbaner Lärmszenarien mittels Außenlärm-Auralisationen ist neben geeigneten Modellen zur Simulation von Schallausbreitung- und empfängern angewiesen auf Modelle von bewegten Quellen wie beispielsweise PKW. In dieser Arbeit wird die Unsicherheit der Quellparameterschätzung von Vorbeifahrtgeräuschen der Fahrzeuge untersucht. Dazu werden die realen Richtcharakteristiken des Mikrofons analysiert. Außerdem werden die Auswirkungen unsicherer Parameter bei der Berechnung […]

Auditory selective attention (ASA) is a common phenomenon which describes the ability to intentionally focus on a specific source of sound while ignoring other irrelevant sounds. Since in real life there are usually visual distractors in addition to auditory distractors, the effect of visual stimuli on ASA is also worth investigating. The purpose of this […]

In tropical countries, air conditioning systems are widely used to improve indoor climate. In many cases, natural ventilation can also provide thermal comfort for users with less energy consumption and better air quality as long as the pollution outdoors is not too high. However, openings in the facades for natural ventilation decrease the sound insulation. […]