Search for dissertations about: "Low frequency vibrations"

Showing result 6 - 10 of 62 swedish dissertations containing the words Low frequency vibrations.

2. 6. Perception of Sound and Vibration in Heavy Trucks

   Author : Anders Genell; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; spectral balance.; meaning; low frequency; product sound quality; annoyance; emotional reactions;

   Abstract : Interior truck cabin sound has for some time been a concern for manufacturers. Today reasonably low sound pressure levels have been achieved using passive absorption. However low frequency sound is difficult to passively absorb and will hence dominate the interior sound. READ MORE

4. 7. Development of Zinc Oxide Piezoelectric Nanogenerators for Low Frequency Applications

   Author : Eiman Satti Nour; Omer Nour; Magnus Willander; Osama O. Awadelkarim; Linköpings universitet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; Zinc oxide ZnO ; hydrothermal growth; piezoelectricity; nanowires NWs ; nanogenerator NG ; energy harvesting; wireless data transmission;

   Abstract : Energy harvesting using piezoelectric nanomaterials provides an opportunity for advancement towards self-powered systems. Self-powered systems are a new emerging technology, which allows the use of a system or a device that perform a function without the need for external power source like for example, a battery or any other type of source. READ MORE

5. 8. Electromagnetic Field Induced Out-of-Equilibrium Structural Dynamics in Protein Crystals: From Picoseconds to Milliseconds

   Author : Viktor Ahlberg Gagnér; Göteborgs universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Terahertz radiation; low frequency vibrations; B-factors; ADP tensor; bovine trypsin; FemtoMAX; resampling; femtosecond structural dynamics; millisecond structural dynamics; LCLS; displacements; distances; photosynthetic reaction center;

   Abstract : Light-induced interactions in biomolecules are strongly varying over different model systems. Most amino acids and proteins absorb ultraviolet light, but only a few with specialised chromophores or fluorophores, are able to absorb light in the visible spectrum. READ MORE

6. 9. Vibroacoustic performance of wooden buildings : Prediction and Perception

   Author : Juan Negreira; Teknisk akustik; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Prediction tools; Low frequency vibrations; Vibroacoustics; Wooden buildings; Impact sound insulation; Finite element method; Vibration measurements; Flanking transmission; Elastomers; Design indicators; Vibration acceptability; Vibration annoyance; MEMS accelerometers;

   Abstract : When the Swedish building regulations in 1994 allowed wooden multi-storey buildings to be built, this type of lightweight construction became popular due to its low cost and ease of construction, as well as wood being a plentiful resource in Sweden. However, complaints amid inhabitants are often reported due to nuisances caused by disturbing vibrations and noise propagating in the building. READ MORE

7. 10. Vibrational energy harvesting for sensors in vehicles

   Author : Johan Bjurström; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; piezoelectric; anti-resonance; electromagnetic induction; prescribed displacement; low frequency; nonlinear dynamics; small amplitude excitation; automotive safety; vibration energy harvesting; unified modeling;

   Abstract : The miniaturization of semiconductor technology and reduction in power requirements have begun to enable wireless self-sufficient devices, powered by ambient energy. To date the primary application lies in generating and transmitting sensory data. READ MORE