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Werner U.,Nurnberg University of Applied Sciences
International Journal of Applied Mechanics | Year: 2017

The aim of the paper is to analyze active vibration reduction of soft mounted electrical machines by using actuators between the motor feet and a soft foundation based on a multibody model. The actuator forces are inserted directly in the vibration model without using a feedback control system. The goal is to reduce the forced vibrations, which are caused by typical excitations of electrical motors — eccentricity of rotor mass, bent rotor deflection and magnetic eccentricity. Based on the simplified model, the mathematical coherences are derived and a numerical example is shown, where different vibration reduction concepts are analyzed and the necessary actuator forces are calculated. The aim of the paper is to show the capability of using actuators between motor feet and soft foundation, based on a simplified multibody vibration model. For future work, the multibody model has to be implemented into a feedback control system for active vibration control. © 2016 World Scientific Publishing Europe Ltd.

Agency: European Commission | Branch: H2020 | Program: IA | Phase: LCE-08-2014 | Award Amount: 15.40M | Year: 2015

The project SENSIBLE addresses the call LCE-08-2014 by integrating electro-chemical, electro-mechanical and thermal storage technologies as well micro-generation (CHP, heat pumps) and renewable energy sources (PV) into power and energy networks as well as homes and buildings. The benefits of storage integration will be demonstrated with three demonstrators in Portugal, UK and Germany. vora (Portugal) will demonstrate storage-enabled power flow, power quality control and grid resilience/robustness in (predominantly low-voltage) power distribution networks under the assumption that these networks are weak and potentially unreliable. Nottingham (UK) will focus on storage-enabled energy management and energy market participation of buildings (homes) and communities under the assumption that the grid is strong (so, with no or little restrictions from the grid). Nuremberg (Germany) will focus on multi-modal energy storage in larger buildings, considering thermal storage, CHP, and different energy vectors (electricity, gas). An important aspect of the project is about how to connect the local storage capacity with the energy markets in a way that results in sustainable business models for small scale storage deployment, especially in buildings and communities. SENSIBLE will also conduct life cycle analyses and assess the socio-economic impact of small-scale storage integrated in buildings distribution networks. By integrating different storage technologies into local energy grids as well as homes and buildings, and by connecting these storage facilities to the energy markets, the project SENSIBLE will have a significant impact on local energy flows in energy grids as well as on the energy utilization in buildings and communities. The impacts range from increased self-sufficiency, power quality and network stability all the way to sustainable business models for local energy generation and storage.

Agency: European Commission | Branch: H2020 | Program: IA | Phase: EeB-07-2015 | Award Amount: 7.29M | Year: 2015

MOEEBIUS introduces a Holistic Energy Performance Optimization Framework that enhances current (passive and active building elements) modelling approaches and delivers innovative simulation tools which (i) deeply grasp and describe real-life building operation complexities in accurate simulation predictions that significantly reduce the performance gap and, (ii) enhance multi-fold, continuous optimization of building energy performance as a means to further mitigate and reduce the identified performance gap in real-time or through retrofitting. The MOEEBIUS Framework comprises the configuration and integration of an innovative suite of end-user tools and applications enabling (i) Improved Building Energy Performance Assessment on the basis of enhanced BEPS models that allow for more accurate representation of the real-life complexities of the building, (ii) Precise allocation of detailed performance contributions of critical building components, for directly assessing actual performance against predicted values and easily identifying performance deviations and further optimization needs, (iii) Real-time building performance optimization (during the operation and maintenance phase) including advanced simulation-based control and real-time self-diagnosis features, (iv) Optimized retrofitting decision making on the basis of improved and accurate LCA/ LCC-based performance predictions, and (v) Real-time peak-load management optimization at the district level. Through the provision of a robust technological framework MOEEBIUS will enable the creation of attractive business opportunities for the MOEEBIUS end-users (ESCOs, Aggregators, Maintenance Companies and Facility Managers) in evolving and highly competitive energy services markets. The MOEEBIUS framework will be validated in 3 large-scale pilot sites, located in Portugal, UK and Serbia, incorporating diverse building typologies, heterogeneous energy systems and spanning diverse climatic conditions.

Agency: European Commission | Branch: H2020 | Program: RIA | Phase: DRS-14-2015 | Award Amount: 4.96M | Year: 2016

Modern critical infrastructures are becoming increasingly smarter (e.g. cities). Making the infrastructures smarter usually means making them smarter in normal operation and use: more adaptive, more intelligent But will these smart critical infrastructures (SCIs) behave equally smartly and be smartly resilient also when exposed to extreme threats, such as extreme weather disasters or terrorist attacks? If making existing infrastructure smarter is achieved by making it more complex, would it also make it more vulnerable? Would this affect resilience of an SCI as its ability to anticipate, prepare for, adapt and withstand, respond to, and recover? These are the main questions tackled by this proposal. The proposal envisages answering the above questions in several steps. (#1) By identifying existing indicators suitable for assessing resilience of SCIs. (#2) By identifying new smart resilience indicators (RIs) including those from Big Data. (#3) By developing a new advanced resilience assessment methodology (TRL4) based on smart RIs (resilience indicators cube, including the resilience matrix). (#4) By developing the interactive SCI Dashboard tool. (#5) By applying the methodology/tools in 8 case studies, integrated under one virtual, smart-city-like, European case study. The SCIs considered (in 8 European countries!) deal with energy, transportation, health, water Results #2, #3, #4 and #5 are a breakthrough innovation. This approach will allow benchmarking the best-practice solutions and identifying the early warnings, improving resilience of SCIs against new threats and cascading and ripple effects. The benefits/savings to be achieved by the project will be assessed by the reinsurance company participant. The consortium involves 7 leading end-users/industries in the area, 7 leading research organizations, supported by academia and lead by a dedicated European organization. External world leading resilience experts will be included in the CIRAB.

Gotzelmann T.,Nurnberg University of Applied Sciences
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2016

Tactile maps can be useful tools for blind people for navigation and orientation tasks. Apart from static maps, there are techniques to augment tactile maps with audio content. They can be used to interact with the map content, to offer extra information and to reduce the tactile complexity of a map. Studies show that audio-tactile maps can be more efficient and satisfying for the user than pure tactile maps without audio feedback. A major challenge of audio-tactile maps is the linkage of tactile elements with audio content and interactivity. This paper introduces a novel approach to link 3D printed tactile maps with mobile devices, such as smartphones and tablets, in a flexible way to enable interactivity and audio-support. By integrating conductive filaments into the printed maps it seamlessly integrates into the 3D printing process. This allows to automatically recognize the tactile map by a single press at its corner. Additionally, the arrangement of the tactile map on the mobile device is flexible and detected automatically which eases the use of these maps. The practicability of this approach is shown by a dedicated feasibility study. © Springer International Publishing Switzerland 2016.

Strehmel V.,Nurnberg University of Applied Sciences
ChemPhysChem | Year: 2012

Stable radicals and recombination of photogenerated lophyl radicals are investigated in ionic liquids. The 2,2,6,6-tetramethylpiperidine-1-yloxyl derivatives contain various substituents at the 4-position to the nitroxyl group, including hydrogen-bond-forming or ionic substituents that undergo additional interactions with the individual ions of the ionic liquids. Some of these spin probes contain similar ions to ionic liquids to avoid counter-ion exchange with the ionic liquid. Depending on the ionic liquid anion, the Stokes-Einstein theory or the Spernol-Gierer-Wirtz theory can be applied to describe the temperature dependence of the average rotational correlation time of the spin probe in the ionic liquids. Furthermore, the spin probes give information about the micropolarity of the ionic liquids. In this context the substituent at the 4-position to the nitroxyl group plays a significant role. Covalent bonding of a spin probe to the imidazolium ion results in bulky spin probes that are strongly immobilized in the ionic liquid. Furthermore, lophyl radical recombination in the dark, which is chosen to understand the dynamics of bimolecular reactions in ionic liquids, shows a slow process at longer timescale and a rise time at a shorter timescale. Although various reactions may contribute to the slower process during lophyl radical recombination, it follows a second-order kinetics that does not clearly show solvent viscosity dependence. However, the rise time, which may be attributed to radical pair formation, increases with increasing solvent viscosity. © 2012 Wiley-VCH Verlag GmbH& Co. KGaA, Weinheim.

Nurnberg University of Applied Sciences | Date: 2016-03-16

A solar collector comprises at least one optical component, at least one receiver, and a tracking means. The tracking means preferably is a passive device, which preferably positions the receiver at the center of the optical output of the optical component. Therefore, not the whole solar collector, but only the receiver is adjusted within the solar collector. This allows to build simple, self-contained and self-adjusting solar collectors.

Nurnberg University of Applied Sciences | Date: 2013-10-31

The invention relates to an optical rotary transmitter for transmitting optical signals, comprising a first light coupler (1) that has one or a plurality of first light guides (11) the end faces of which are designed to transmit optical signals and are arranged on a first ring about a central rotational axis Z, a second light coupler (3) that has one or a plurality of second light guides (31) the end faces of which are designed to transmit optical signals and are arranged on a second ring about the central rotational axis Z, a fibre mirror (5) comprising a plurality of third light guides that are arranged between said two light couplers (1,3) and are designed to compensate for the effect, on the transmission of the optical signals, of the two light couplers (1,3) rotating relative to one another, the end faces of the third light guides being designed to transmit optical signals and arranged on a third and fourth ring about the central rotational axis Z. Light inlet/outlet surfaces that are formed by the third and fourth rings are substantially gap-free such that the optical signals can be continuously transmitted without interruption.

Nurnberg University of Applied Sciences | Date: 2011-04-21

An optical rotary transmitter which ensures the reliable transmission of optical signals in conjunction with a comparatively simple construction comprises two parts spaced apart from one another which are rotatable relative to one another about a common centre axis and the first of which comprises a first circular light coupler (10) and the second of which comprises a second circular light coupler (20). The light entrance and light exit surfaces of the two light couplers face one another. Each of the light couplers (10, 20) consists of collimators (11, 21) combined to form a respective collimator arrangement (16, 26), optical coupling elements (15, 25) being connected to said collimators.

Nurnberg University of Applied Sciences | Date: 2012-06-21

The invention relates to an apparatus for the optical transmission of digital data having a signal source (1) which is designed to output optical signals at a level which is modulated on the basis of the digital data to be transmitted. The invention provides a fluorescing optical fiber (3) which is arranged such that the optical signals from the signal source (1) are received via a peripheral area which is entered by fluorescing optical fiber (3) which are converted therein into a fluorescent light signal by means of fluorescence, said fluororescent light signal being mounted to a fibre end (5) via the optical fibre (3).

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