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Publikationen von Professorinnen und Professoren der HAW Hamburg

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Dieter Scholz
Aircraft Cabin Air and Engine Oil - An Engineering View
Journal of Health and Pollution, 9(24):93-98
Dezember 2019
ISSN: 2156-9614

Schlüsselwörter: aeronautics, airplanes, aircraft, aerospace engineering, turbofan engine, aircraft cabins, cabin air, passenger, oil, air conditioning, bleed air

Marker: TI-FF

Zusammenfassung: Almost all passenger jet aircraft today use potentially contaminated bleed air for cabin ventilation. A detailed look at the design of engine bearings, their lubrication and sealing reveals that jet engines leak small amounts of oil by design and not only in failure cases. An equation is derived to calculate the concentration of a possible cabin air contamination. Results show good agreement with measured concentrations of hydrocarbons in aircraft cabins under normal conditions. The solution to the problem of cabin air contamination is a bleed free design. Other partial remedies are briefly discussed.

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Levin Schilling und Peter Dalhoff
Piezoelectric Patch Transducers: Can alternative sensors enhance bearing failure prediction?
Journal of Physics: Conference Series, 1356(012015)
25 Oktober 2019
English

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Dirk Adamski
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MOBILES,
September 2019

Marker: TI-I

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Markus Linke und Karin Landenfeld
Competence-based Learning in Engineering Mechanics in an Adaptive Online-Learning Environment
Teaching Mathematics and its Applications: An International Journal of the IMA, 38(3):146-153
September 2019

Schlüsselwörter: FF-ELFE Kompetenzorientierte Lehre Technische Mechanik Engineering Mechanics

Marker: TI-F+F

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Felix Langfeldt und Wolfgang Gleine
Membrane- and plate-type acoustic metamaterials with elastic unit cell edges
Journal of Sound and Vibration, 453:65-86
4 August 2019

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Dieter Scholz
DGLR-Weiterbildung "Flugzeugentwurf"
Luft- und Raumfahrt, 40(3):38-39
Juli 2019

Schlüsselwörter: Flugzeug, Entwurf, Luftverkehr, Zulassung, Anforderungen, Flugbetrieb, Umwelt, Kraftstoffverbrauch, Kosten, DGLR, HAW Hamburg, Airbus

Marker: TI-FF

Zusammenfassung: Im Flugzeugentwurf vereint sich das gesamte Wissen des Flugzeugbaus. Denn ein neues Flugzeug muss sich sowohl innerhalb des Luftverkehrssystems als auch im multimodalen Verkehr behaupten. Die Flugzeugparameter werden dabei ausgehend von Anforderungen wie Nutzlast und Reichweite so ermittelt, dass die Kosten beim Betrieb des Flugzeugs und dessen Umweltbelastung minimiert werden - eine hochkomplexe Aufgabe. Wie das Vorgehen beim Entwurf von Flugzeugen unter Berücksichtigung der Zulassungsvorschriften genau abläuft, lernen die Teilnehmer des DGLR-Weiterbildungskurses „Flugzeugentwurf", der vom 9. bis 12. September 2019 im ZAL TechCenter in Hamburg stattfindet.

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Said El-Busaidy, Bernd Baumann, Marcus Wolff, Lars Duggen und Henry Bruhns
Experimental and Numerical Investigation of a Photoacoustic Resonator for Solid Samples: Towards a Non-Invasive Glucose Sensor
Sensors, 19(13)
29 Juni 2019

Marker: TI-MP

Zusammenfassung: T-cell resonators have been used lately for non-invasive blood glucose measurements for photoacoustic spectroscopy on skin samples. A resonator has a significant role in determining the strength of the measured signal and the overall sensitivity of the sensor. Here we present results of the measurement of the photoacoustic signal of such a T-cell resonator. The signal is also modelled using the amplitude mode expansion method, which is based on eigenmode expansion and the introduction of losses in the form of loss factors. The measurement reproduced almost all the calculated resonances from the numerical models with fairly good agreement. The cause of the differences between the measured and the simulated resonances are explained. In addition, the amplitude mode expansion simulation model is established as a faster and computationally less demanding photoacoustic simulation alternative to the viscothermal model. The resonance frequencies from the two models differ by less than 1.8%. It is noted that the relative height of the amplitudes from the two models depends on the location of the antinodes within the different parts of the resonator. The amplitude mode expansion model provides a quick simulation tool for the optimization and design of macro resonators.

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Lahti Mari, Groen Gunter, Mwape Lonia, Korhonen Joonas und Breet Elsie Breet
Design and Development Process of a Youth Depression Screening m-Health Application for Primary Health Care Workers in South Africa and Zambia: An Overview of the MEGA Project.
Issues in Mental Health Nursing,
21 Juni 2019

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Maximilian Otto Heinrich Schutzeichel, Thomas Kletschkowski, Peter Linde und Leif E Asp
Experimental characterization of multifunctional polymer electrolyte coated carbon fibres
Functional Composites and Structures, 1(2)
12 April 2019

Schlüsselwörter: thermo-mechanical testing, structural batteries, material characterization

Marker: TI- F+F

Zusammenfassung: Multifunctional structures like the structural energy storage are investigated for enhanced lightweight design. Polymer electrolyte coated carbon fibres (PeCCF) function as a battery half-cell, combining negative electrode and structural electrolyte of the energy storage. The new material combination results in unknown mechanical and multiphysical effective characteristics. Looking forward to future multifunctional CFRP structures made from PeCCF, an influence of the multiphysical PeCCF properties on the CFRP laminate characteristics is expected. This paper presents experimental work, focusing on the first multiphysical characterization of state of the art PeCCF. Thereby, physical effects like the thermo-mechanical coupling in a temperature domain of 193 K??<T??<??720 K and the temperature induction by resistive heating are characterized. Important finding is a temperature dependent complex modulus of the material compound, which is related to the temperature dependent mechanical behaviour of the polymer coating. In addition, the ability to adapt and to predict the materials temperature, which is influenced by resistive heating, is shown. Furthermore, first indications of durability of the coating after cyclic mechanical loading are presented. In addition, new experimental methods for PeCCF investigation are proposed, e.g. the application of conductive epoxy resin for electrical connections.

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Felix Langfeldt, Hannah Hoppen und Wolfgang Gleine
Resonance frequencies and sound absorption of Helmholtz resonators with multiple necks
Applied Acoustics, 145:314-319
Februar 2019

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Letzte Änderung: 23.01.15

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