Fak. 5 Verkehrs- und Maschinensysteme

1766 Items

Recent Submissions
Thermalkontrollsystem mit Latentwärmespeicher für Picosatelliten

Wolf, Ronny (2021)

Die Einsatzmöglichkeiten von CubeSats haben in den letzten Jahren, aufgrund des technologischen Fortschritts, rasant zugenommen. Fortschreitende Entwicklungen im Bereich Erdbeobachtung und Echtzeit-Kommunikation, wie dem Internet-der-Dinge, erfordern zunehmend verteilte Satellitensysteme. Damit solche Konstellationen für Unternehmen der NewSpace-Branche finanzierbar sind, werden Anstrengungen u...

Aeroacoustic noise reduction by application of end plates on wall-mounted finite airfoils

Schneehagen, Erik ; Geyer, Thomas F. ; Sarradj, Ennes ; Moreau, Danielle J. (2021-04-24)

One known method to reduce vortex shedding from the tip of a blade is the use of end plates or winglets. Although the aerodynamic impact of such end plates has been investigated in the past, no studies exist on the effect of such end plates on the far-field noise. The aeroacoustic noise reduction of three different end-plate geometries is experimentally investigated. The end plates are applied ...

New control approaches to improve contact quality in the conventional spans and overlap section in a high-speed catenary system

Vesali, Farzad ; Molatefi, Habibollah ; Rezvani, Mohammad A. ; Moaveni, Bijan ; Hecht, Markus (2019-01-10)

Continuous and quality contact between the pantograph and the catenary system is one of the major challenges for increasing the speed of electric trains. Compared to other studies, this paper has considered the catenary system as the main system and has assumed the pantograph as an excitation factor. Based on this, a controller has been applied on the contact wire, once at the last span and ano...

Do we really need more stages? Comparing the effects of likelihood alarm systems and binary alarm systems

Zirk, Anna ; Wiczorek, Rebecca ; Manzey, Dietrich (2019-06-19)

Objective: This research investigates the potential behavioral and performance benefits of a 4-stage likelihood alarm system (4-LAS) contrasting a 3-LAS, a binary alarm system with a liberal threshold (lib-BAS) and a BAS with a conservative threshold (con-BAS). Background: Prior research has shown performance benefits of 3-LASs over conventional lib-BASs due to more distinct response strategie...

Long-term water conservation is fostered by smart meter-based feedback and digital user engagement

Cominola, Andrea ; Giuliani, Matteo ; Andrea Castelletti, Andrea ; Fraternali, Piero ; Gonzalez, Sergio Luis Herrera ; Herrero, Joan Carles Guardiola ; Novak, Jasminko ; Rizzoli, Andrea Emilio (2021-05-07)

Consumption-based feedback has been demonstrated to encourage water conservation behaviors. Smart meters and digital solutions can support customized feedback and reinforce behavioral change. Yet, most of the studies documenting water conservation effects induced by feedback and smart meter data visualization evaluate them in short-term experimental trials only. Here we show that water conserva...

Challenges and procedures for experiments with steady and unsteady model velocities in a water towing tank

Jentzsch, Marvin ; Schmidt, Hanns -Joachim ; Woszidlo, René ; Nayeri, Christian Navid ; Paschereit, Christian Oliver (2021-03-23)

Challenges for steady and unsteady model motion in a large water towing tank and procedures to overcome them are the focus of the presented work. Some challenges are attributed to experiments conducted in water, whereas others are uniquely ascribed to a towing tank facility. Data convergence and outlier detection are studied based on the phase averaged pressure in order to ensure proper data qu...

Emergency evacuation simulation of commercial aircraft

Gobbin, Andreas ; Khosravi, Raman ; Bardenhagen, Andreas (2021-03-10)

In order to receive certification approval for new products, aircraft manufacturers have to comply with the specifications regarding cabin evacuation. In case of real evacuation trials, agent-based simulation can be deployed, as they are a less cost-intensive mean of analysing passenger behaviour during the evacuation of commercial aircraft. This paper aims at examining the suitability of agent...

Structural design process and subsequent flight mechanical evaluation in preliminary aircraft design: demonstrated on passenger ride comfort assessment

Krishnamurthy, Vikram ; Handojo, Vega (2021-04-19)

New fuel-efficient aircraft designs have high aspect ratio wings. Consequently, those aircraft are more flexible. Additionally, load alleviation functions are implemented to reduce the structural loads, which results in further reductions of the structural stiffness. At the same time, the structural design impacts other disciplines in preliminary aircraft design, especially flight mechanics. Fo...

MODUS-COVID Bericht vom 21.05.2021

Müller, Sebastian Alexander ; Charlton, William ; Conrad, Natasa Djurdjevac ; Ewert, Ricardo ; Rakow, Christian ; Wulkow, Hanna ; Conrad, Tim ; Schütte, Christof ; Nagel, Kai (2021-05-21)

Die Mobilitätsdaten der letzten Wochen zeigen, dass das Niveau der aushäusigen Aktivitäten insgesamt immer weiter angestiegen ist. Aufgrund des hohen Impftempos und des wärmer werdenden Wetters bestehen Spielräume für Öffnungen. Wir formulieren vier Kriterien mit denen mögliche Öffnungsmaßnahmen bewertet werden können. Wir untersuchen die Wirkung sogenannter Impf-Escape-Mutationen auf das zukün...

Visual search behavior and performance in luggage screening: effects of time pressure, automation aid, and target expectancy

Rieger, Tobias ; Heilmann, Lydia ; Manzey, Dietrich (2021-02-25)

Visual inspection of luggage using X-ray technology at airports is a time-sensitive task that is often supported by automated systems to increase performance and reduce workload. The present study evaluated how time pressure and automation support influence visual search behavior and performance in a simulated luggage screening task. Moreover, we also investigated how target expectancy (i.e., t...

Switching Action of a Bistable Fluidic Amplifier for Ultrasonic Testing

Schweitzer, Thorge ; Hörmann, Marla ; Bühling, Benjamin ; Bobusch, Bernhard (2021-04-25)

Air-coupled ultrasonic testing is widely used in the industry for the non-destructive testing of compound materials. It provides a fast and efficient way to inspect large concrete civil infrastructures for damage that might lead to catastrophic failure. Due to the large penetration depths required for concrete structures, the use of traditional piezoelectric transducer requires high power elect...

The Effects of HLAW Parameters for One Side T-Joints in 15 mm Thickness Naval Steel

Churiaque, Cristina ; Sánchez-Amaya, Jose Maria ; Porrúa-Lara, Manuel ; Gumenyuk, Andrey ; Rethmeier, Michael (2021-04-07)

The present contribution is the first research reporting full penetration HLAW joints in 15 mm thick EH36 steel butt T-welds with square grooves on 2F welding position by single-sided welding. The effects of welding parameters were investigated to increase the quality of the joints. Conditions leading to defect-free full penetration welds fulfilling naval regulations includes a laser power of 1...

Methodology for Estimating the Spatial and Temporal Power Demand of Private Electric Vehicles for an Entire Urban Region Using Open Data

Straub, Florian ; Streppel, Simon ; Göhlich, Dietmar (2021-04-08)

With continuous proliferation of private battery electric vehicles (BEVs) in urban regions, the demand for electrical energy and power is constantly increasing. Electrical grid infrastructure operators are facing the question of where and to what extent they need to expand their infrastructure in order to meet the additional demand. Therefore, the aim of this paper is to develop an activity-bas...

Fluidic-Oscillator-Based Pulsed Jet Actuators for Flow Separation Control

Löffler, Stephan ; Ebert, Carola ; Weiss, Julien (2021-04-20)

The control of flow separation on aerodynamic surfaces remains a fundamental goal for future air transportation. On airplane wings and control surfaces, the effects of flow separation include decreased lift, increased drag, and enhanced flow unsteadiness and noise, all of which are detrimental to flight performance, fuel consumption, and environmental emissions. Many types of actuators have bee...

Inverse analysis of metamaterials and parameter determination by means of an automatized optimization problem

Shekarchizadeh, Navid ; Abali, Bilen Emek ; Barchiesi, Emilio ; Bersani, Alberto Maria (2021-01-08)

In this paper, a novel parameter determination technique is developed for material models in continuum mechanics aimed at describing metamaterials. Owing to their peculiar mechanical properties and behaviors, such as extreme elasticity or high strength‐to‐weight ratio, metamaterials are of interest to be simulated by reduced‐order modeling by means of the generalized mechanics. Such models inco...

Reducing wheel wear from the perspective of rail track layout optimization

Ye, Yunguang ; Sun, Yu (2021-06-01)

Wheel wear (W-wear) is one of the most critical issues affecting vehicle-track performances and operating costs. Currently, the works on W-wear behavior and W-wear reduction are mainly based on four aspects: wheel-rail (WR) tribology, WR profile, vehicle structure design and active control of vehicle suspensions. Little attention has been paid to the effects of track layout parameters, such as ...

MODUS-COVID Bericht vom 30.04.2021

Müller, Sebastian Alexander ; Charlton, William ; Conrad, Natasa Djurdjevac ; Ewert, Ricardo ; Rakow, Christian ; Wulkow, Hanna ; Conrad, Tim ; Schütte, Christof ; Nagel, Kai (2021-04-30)

Die Mobilitätsdaten zeigen einen leichten aber deutlichen Trend zu einem höheren Aktivitätsniveau. In Berlin hat sich die tägliche Zahl der Neuinfektionen auf einem Plateau stabilisiert. Bei Beibehaltung des jetzigen Verhaltens ist aufgrund von Immunisierung, insbesondere durch Impfungen aber auch durch überstandene Infektionen in Kombination mit wärmeren Temperaturen, zeitnah mit einem Absinke...

Traffic noise feedback in agent-based Integrated Land-Use/Transport Models

Kuehnel, Nico ; Ziemke, Dominik ; Moeckel, Rolf (2021-03-14)

Road traffic is a common source of negative environmental externalities such as noise and air pollution. While existing transport models are capable of accurately representing environmental stressors of road traffic, this is less true for integrated land-use/transport models. So-called land-use-transport-environment models aim to integrate environmental impacts. However, the environmental impli...

Neural Network Hyperparameter Optimization for the Assisted Selection of Assembly Equipment

Hagemann, Simon ; Sünnetcioglu, Atakan ; Fahse, Tobias ; Stark, Rainer (2019-12-16)

The design of assembly systems has been mainly a manual task including activities such as gathering and analyzing product data, deriving the production process and assigning suitable manufacturing resources. Especially in the early phases of assembly system design in automotive industry, the complexity reaches a substantial level, caused by the increasing number of product variants and the decr...

Evaluation of rapeseed varieties using novel integrated fuzzy PIPRECIA – Fuzzy MABAC model

Nedeljković, Miroslav ; Puška, Adis ; Doljanica, Suzana ; Jovanović, Saša Virijević ; Brzaković, Pavle ; Stević, Željko ; Marinkovic, Dragan (2021-02-25)

Decision making is constantly present in agriculture. Choosing the wrong variety carries the risk that the investment in terms of sowing does not pay off at all. Therefore, it is necessary to choose the variety that gives the best results. In order to achieve this, it is necessary to apply multi-criteria decision-making of available varieties, which is, in this paper, done on the example of hyb...