Transfer von Methoden der Aktionsforschung für urbane Mobilitätslabore am Beispiel von Mobilitätsexpeditionen

Zwischen dem Stand der Forschung und der Praxis urbaner Mobilität ist eine deutliche Umsetzungslücke erkennbar, die Urbane Mobilitätslabore überbrücken wollen. Ziel ist es, Innovationen zu forcieren und sie in den Alltag der Menschen zu intergrieren. Urbane Mobilitätslabore erfordern dabei ein umfangreiches Methodenset aus Analyse, Kommunikation und Visualisierung, um die Bedürfnisse der Menschen zu verstehen, Innovationen in Testsituationen umzusetzen und zu vermitteln (vgl. Berger et. al. 2016b). Die urbanen Mobilitätslabore bauen größtenteils auf dem Konzept des Reallabors auf. Reallabore wiederrum können als Fortsetzung der bereits verbreiteten Aktionsforschung gesehen werden, welche auf einem experimentellen Setting in einer iterativen Abfolge von Handlung, Reflexion und Planung fußt (vgl. Parodi et.al. 2016). Im Rahmen der Sondierung1 der UMLs wurden Methoden der Aktionsforschung für den Bereich der Mobilitätsforschung adaptiert und deren Anwendbarkeit im Kontext der Mobilitätslabore getestet. So wurden beispielsweise Mobilitätsexpeditionen als reflektierte Auseinandersetzung mit der lokalen Situation realisiert. Im Rahmen der Publikation soll aufgezeigt werden, ob und wie sich diese Methoden der Aktionsforschung im Rahmen von UML-Prozessen bewähren. Hierzu werden zuerst die Methoden in ihrer Vorbereitung, Realisierung und Auswertung sturkturiert beschrieben. In einem zweiten Schritt werden die Anwendungsbeispiele gegenübergestellt und verglichen. Hierauf aufbauend können Verbesserungsansätze für den Einsatz der Methoden für die Zwecke der UML’s formuliert werden

Online SP-off-RP Travel Surveys for Identification of Target Group Specific Measures and Uptake Potentials in Rural Municipalities – Learnings from the Pilot Case Feldkirchen/Donau

Planning processes are often fed with various streams of data, experiences and knowledge from different stakeholders involved. Especially the user perspective and acceptance of possible solutions can be measured through different qualitative or quantitative approaches. To allow a certain level of objectivity, comparability and accuracy, structured and standardized quantitative data collection methods are needed to collect mobility behaviour data. In this context questions regarding financial and capacity-related feasibility of certain innovative methods for local municipalities in rural context arises. This paper discusses possible scenarios for enhanced collection of mobility behaviour data (stated and revealed) to enable target group specific development of mobility measures in rural contexts. On the example of a “Mobilitätswerkstatt” and an accompanying travel survey via the “mobyome-App” realized in Feldkirchen/Donau (Federal state of Upper Austria), outcomes and possible use of data and insights are discussed. Further on the trade-offs between usability, length of the travel survey, representativity and financial feasibility will be explored. The mobyome-App, developed by the team of mobyome KG 1 – an impact-oriented company based in Vienna and Linz (both Austria), tries to combine an SP-off-RP approach on trip-leg level with an Web-App interface which allows to keep the technological burden as low as possible. As the mobyome-App was used in the rural municipality of Feldkirchen/Donau2 , around 5% of the inhabitants fully participated in the data collection. In the paper first insights on detailed response rates, identification of possible user groups for future mobility services like ridesharing-applications or the willingness for behaviour change will be discussed. On the example of Feldkirchen/Donau, the paper will showcase possible (future) analyses based on the obtained data

Cold flow analysis of spray angle and droplet size distribution of a pintle injector for green hypergolic propellants

In this paper, the effects of spray angle and droplet size for green hypergolic propellants in an initial cold flow investigation using a pintle injector is described. Therefore, simulants were used to match the rheological properties of the propellant combination. The spray was monitored by a shadowgraph setup and measured by a droplet size measurement system. With shadowgraph measurements the spray cone angle was determined and compared to previous research literature. First insights of the influence of high viscous fluids on droplet size distribution from pintle injectors could be gained. Results indicate that the viscosity has a minor influence on the spray angle but larger impact on droplet size

Nitromethane as a Green Propellant: First Results of a Combustion Test Campaign

Because of hydrazine's carcinogenic and toxic nature its use in space propulsion is expensive and may lead to significant delays. One already established alternative is to use energetic salt-based ionic liquid propellants, dissolving ammonium dinitramide or hydroxyl ammonium nitrate in water with additives. However, with this approach costs remain high because these substances are quite costly and highly regulated due to their partly unstable and energetic nature. Nitromethane, being a widely available solvent, offers a cost-effective solution, with comparable propulsive performance. In this paper results of a hot-fire test campaign are presented. Stable combustion using NMP-001 a nitromethane-based monopropellant at 15 to 40 bar pressure at 84 to 94 % C*-efficiency in a combustion chamber with L* = 9 to 11.7 m was demonstrated

Green Propulsion Demonstrator “The LÄNDer”

For future manned and unmanned space missions, landing systems are required, which are able to initiate and carry out soft autonomous landings on extraterrestrial celestial bodies. Development of rapid and robust guidance and control (GNC) systems as well as efficient, controllable and safe thrusters meeting a high level of autonomy and safety is crucial for successful lander missions. To meet those requirements, both component level view such as physico-chemical behavior of the propellants and the transients of the propulsion system itself as well as the system level view of the behavior of the holistic system are of utmost interest. To enable extensive testing and demonstration of new GNC methods and rocket engines, DLR Lampoldshausen has extended its research fields to develop a modular lander platform and a test bench with variable degrees of freedom. The aim is to combine extensive testing of GNC algorithms with sustainable propellant technology

Research and Test Activities on Advanced Rocket Propellants at DLR’s Institute of Space Propulsion in Lampoldshausen

The present paper gives a comprehensive overview and summary of research and test activities conducted at the test facility M11 and the physical-chemical lab at DLR in Lampoldshausen. The focus of the research is on advanced rocket propellants and new materials for space technologies. In addition, the activities regarding supersonic flows and cooling of SCRamjets will be shown and discussed. Also the use of machine learning methods for rocket engine control are presented. The activities on advanced rocket pro pellants include research on ADN (Ammonium dinitramid)-based propellants, hydrogen peroxide, mono- and bipropellants based on nitrous oxide (HyNOx), green hypergolic bipropellants as well as gelled and nitromethane based propellants. For each propellant or propellant combination, the main research and test results of DLR internal projects are summarized. Furthermore, selected results of EU and ESA projects regarding advanced propellants and research conducted at DLR Lampoldshausen are presented