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Kale N.V.,QualityPark AviationCenter GmbH | Ilkay F.,Hochschule fur Angewandte Wissenschaften | Zysk O.,QualityPark AviationCenter GmbH
International Journal of Structural Integrity | Year: 2015

Purpose - This document presents a Particular Risks Assessment (PRA) performed on an Uncontained Engine Rotor Failure (UERF) event for the new aircraft design hybrid Extremely Short Take Off and Landing All Surface (ESTOLAS) aircraft. All three propellers of the ESTOLAS (one hub propeller and two feed propellers) are evaluated for their impact on the aircraft in case of an UERF. The purpose of this paper is to present an illustration of the safety analysis and its requirement in new aircraft development. Design/methodology/approach - The methodology used is in accordance with the aerospace industry safety standard Society of Automobile Engineers (SAE) Aerospace Recommended Practices (ARP) 4,761 (Guidelines and Methods for Conducting the Safety Assessment Process on Civil Airborne Systems and Equipment). Trajectory analyses are used on a digital mock-up of the aircraft to simulate the movement of the propeller blade fragments and its effect on the aircraft and its systems. Findings - The paper provides an insight into the industry practice of performing PRA on new aircraft designs. The study identifies safe and unsafe regions of the aircraft, with the UERF event in mind. Technical solutions are suggested to minimize the damage to the aircraft and its systems. Originality/value - This document fulfills the originality criterion, since it is an analysis performed on a new aircraft design - the ESTOLAS. ©Emerald Group Publishing Limited. Source


Lahn J.,match2blue | Peter H.,match2blue | Braun P.,Hochschule fur Angewandte Wissenschaften
ACM International Conference Proceeding Series | Year: 2015

In this paper we describe a simple car crash detection algorithm implemented on Android smartphones. The algorithm uses accelerometer sensor and location sensor information which are combined to detect typical patterns of car crash situations. We present technical details of our implementation and first results of an evaluation. Source


Background: Patient education can contribute to obtaining and maintaining mobility in elderly with mobility impairments. The aim of this study was to evaluate counseling, training, and information needs in elderly patients with mobility impairments before, during, and after a hospital stay in a geriatric clinic. Methods: A prospective longitudinal study was conducted. Needs were assessed at admission (t1), after 2 weeks (t2), at discharge (t3), after 3 months (t4), and after 6 months (t5). Data were analyzed using descriptive statistics. Results: At almost all time points, there was a need of counseling and information. Counseling needs mainly comprised the themes assistive advices, fall prevention, professional nursing care, other services, nutrition, and pain management. Information needs comprised the themes fall prevention, professional nursing care, other services, assistive devices, nutrition, and modification of living space. There was a need of training mainly at admission and at discharge. Training needs comprised approach to assistive devices and mobility facilitation. Conclusion: Training should include activities related to mobility, while counseling and information should comprise all areas of life. © 2013 Springer-Verlag Berlin Heidelberg. Source


Herrmann V.,Studiengang Kunststoff und Elastomertechnik | Nass F.,Studiengang Kunststoff und Elastomertechnik | Lemmich S.,Studiengang Kunststoff und Elastomertechnik | Wachter F.,Studiengang Kunststoff und Elastomertechnik | Hartel V.,Hochschule fur Angewandte Wissenschaften
Gummi, Fasern, Kunststoffe | Year: 2013

In addition to the studies presented in the first part the second part at hand deals with the production of cylinders depending on the throttle position of the EFE system having been used and the practically relevant investigation of their proper functioning. Apart from testing the mechanical properties the focus has been on verifying the absence of bubbles in the centre of the article. The maximally attainable cure time reductions have been determined for different production parameters (mould temperature, injection speed). Depending on these parameters cure time reductions up to 41 % can be achieved. However, additional NMR investigations revealed, that especially for lower cure time reductions (< 25 %) more uniform crosslink density profiles over the cross section of the part can be obtained. Major cure time reductions by adjusting the throttle position are to the disadvantage of a more homogeneous crosslink density profile, although changes in mechanical properties have not yet been observed. This will be the object of the third part of the investigation, still to follow. Source


Shapiro A.I.,World Radiation Center | Solanki S.K.,Max Planck Institute for Solar System Research | Solanki S.K.,Kyung Hee University | Krivova N.A.,Max Planck Institute for Solar System Research | And 6 more authors.
Astronomy and Astrophysics | Year: 2014

Context. The Sun and stars with low magnetic activity levels become photometrically brighter when their activity increases. Magnetically more active stars display the opposite behavior and become fainter when their activity increases.Aims. We reproduce the observed photometric trends in stellar variations with a model thattreats stars as hypothetical suns with coverage by magnetic features different from that of the Sun.Methods. The model attributes the variability of stellar spectra to the imbalance between the contributions from different components of the solar atmosphere, such as dark starspots and bright faculae. A stellar spectrum is calculated from spectra of the individual components by weighting them with corresponding disk-area coverages. The latter are obtained by extrapolating the solar dependences of spot and facular disk-area coverages on chromospheric activity to stars with different levels of mean chromospheric activity.Results. We find that the contribution by starspots to the variability increases faster with chromospheric activity than the facular contribution. This causes the transition from faculae-dominated variability and direct activity-brightness correlation to spot-dominated variability and inverse activity-brightness correlation with increasing chromospheric activity level. We show that the regime of the variability also depends on the angle between the stellar rotation axis and the line-of-sight and on the latitudinal distribution of active regions on the stellar surface. Our model can be used as a tool for extrapolating the observed photometric variability of the Sun to Sun-like stars at different activity levels, which makes a direct comparison between solar and stellar irradiance data possible. © ESO, 2014. Source

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