43 Works

Analytical model for determining the manual consolidation time for large equipment manufacturers

Jakob Schyga, Philipp Braun, Svenja Hilbrich, Johannes Hinckeldeyn & Jochen Kreutzfeldt
Large and complex products such as aircrafts or wind energy plants are usually produced in small batches. This leads to particular requirements for logistics with regard to process efficiency, flexibility and reliability as well as coordination and control of the processes. In practice, the consolidation of parts from different storage areas is a labour-intensive process, which must be considered in the planning or remodelling of warehouses. This work presents an analytical model to determine the...

Creating a worker-individual physical ability profile using a low-cost depth camera

Justus Brosche, Hannes Wackerle & Hermann Lödding
Assembly workers suffer from long-term damage performing physically intensive tasks due to workstations that are not ergonomically designed for the individual’s needs. Current approaches towards ergonomic improvements of workstations only assess the workstations themselves without taking the individual worker and abilities into account. Therefore, physical limitations, such as age-related loss of range of motion, are not addressed. Work-induced long-term damages result in employee absences, especially of workers close to their pension. Regarding the demographic change,...

Towards structural health monitoring using vibro-acoustic modulation in the real world

Peter Oppermann, Lennart Dorendorf, Benjamin Boll, Abedin I. Gagani, Nikolay Lalkovski, Bernd-Christian Renner, Marcus Rutner, Robert Meißner & Bodo Fiedler
In this paper we explore the opportunities and challenges of deploying a Wireless Sensor Network to monitor the structural health of civil infrastructure using Vibro-Acoustic Modulation. The fundamentals of the method are explained and the challenges for a sensor network in a practical implementation are investigated. Ideas and requirements for the sensor nodes are analyzed and presented.

Methodical approach for the model-based development of aircraft cabin product families under consideration of lightweight and cost-based design

Michael Hanna, Johann Schwenke, Lukas Schwan & Dieter Krause
Aircraft cabin monuments must be optimized in terms of lightweight design, cost structure and variance. Model-based approaches support the aircraft data and help to modify them consistently during further development. In this paper, a holistic methodological approach for product families of aircraft cabin development is shown, which integrates lightweight and cost-efficient aspects, in addition to the variance focus. For this purpose, the development of cost-efficient and ligthweight optimized cabin modules is supported in a model-based...

An efficient adjoint sensitivity analysis of flexible multibody systems for a level‐set‐based topology optimization

Ali Azari Nejat, Alexander Held & Robert Seifried
For large-scale topology optimization of flexible multibody systems, only little results exist. This is due to the complexity of the modeling of the flexible bodies and the big effort to provide exact gradients. The considered flexible multibody systems can undergo both large nonlinear motions as well as small elastic deformations. Here, the flexible components are modeled by the floating frame of reference approach. For gradient calculation, the fully coupled adjoint sensitivity analysis is used, which...

Stable inversion for flexible multibody systems using the ANCF

Svenja Drücker & Robert Seifried
Flexible robots are often non-minimum phase systems. Thus, their inverse model must be computed by stable inversion. Here, a simplification to the stable inversion process is proposed, which enables its application to complex underactuated multibody systems. As an example, a flexible manipulator modeled by the absolute nodal coordinate formulation is considered.

Simulation-based performance analysis for future robust modular product architectures

Florian Dambietz, Erik Greve & Dieter Krause
The increased demand for customer-adapted product solutions shows an increasing trend of product variety, leading to an increased internal variety and therefore -costs. The concept of modularization provides apossible solution to this challenge by developing modular kits. Nevertheless, modularization methods to not lead to one individual modular kit, but to several alternatives. The decision of which alternative to implement can be crucial to the applying companys succes. During this decision-making both customer- and company perspectives...

TinyAID : automated instrumentation and evaluation support for TinyOS

Christoph Weyer, Bernd-Christian Renner, Volker Turau & Hannes Frey

On the feasibility of WiFi-enabled and solar-powered sensors for smart ports

Lars Hanschke, Jan Heitmann & Bernd-Christian Renner

Evolution of an acoustic modem for µAUVs

Jan Heitmann, Lucas Bublitz, Timo Kortbrae & Bernd-Christian Renner

Developing a VR training environment for fingers rehabilitation

Ahmed Aly Ibrahim Aly, Alireza Abbasimoshaei & Thorsten Alexander Kern
There are many people worldwide suffering from hand im- pairment due to stroke. The inabilities to extend the thumb and fingers are the obstacles that face those patients as they cannot successfully grasp and release objects in their daily lives. Therefore, the ability to regain the motion function of fingers of stroke patients becomes an im- portant research topic. Gamification of VR-based rehabilitation system encourages the patients to actively participate in rehabilitation, which could result...

Introducing a framework to generate and evaluate the cost effects of product (family) concepts

Kai Gustav Mertens, Mark Schmidt, Tugba Yildiz & Matthias Meyer
Product concept generation and evaluation are critical for the success of new product developments (NPD) because managers need to select the most profitable product concepts. However, current approaches can be restricted to single products and do not cover product families' effects. Similarly, they do not necessarily capture all requirements and usually lack extensive cost analyses. Thus, this paper proposes a framework supporting product concept generation and evaluation by providing an accessible conceptualization to overcome the...

Interdisciplinary system architectures in agile modular development in the product generation development model using the example of a machine tool manufacturer

Clemens Birk, Marc Züfle, Albert Albers, Nikola Bursac & Dieter Krause
This paper considers the orientation of product development structures towards interdisciplinary system architectures using the example of a tool machine manufacturer. Due to the change from simple mechanical products to extensively designed systems, whose successful development requires the integration of all disciplines involved, it is analyzed which requirements there are for these interdisciplinary system architectures in today's development environment. In addition, it is validated on the basis of the investigation environment that interdisciplinary system structures...

The underwater noise reduction of pumpjet propulsor using sawtooth duct with different inclination angles

Denghui Qin, Guang Pan, Yao Shi & Qiaogao Huang
The sawtooth duct noise reduction technology is used for underwater noise reduction of Pumpjet Propulsor (PJP). Flow around the PJP is solved using Detached-Eddy-Simulation (DES) model, while noise is predicted based on Ffowcs-Williams and Hawkings equation. Results show that the sawtooth duct can reduce the sound pressure level of PJP over the frequency range 100-5000 Hz, although it will result in water efficiency loss at low J cases. The sawtooth duct makes the axial velocity...

Time bias awareness in ECG-based multiple source data matching

Urs-Vito Albrecht, Dennis Lawin, Sebastian Kuhn & Ulf Kulau
For cardiological datasets acquired via different methodologies, ECG signals that are recorded in parallel allow for relatively accurate matching. Some research issues, e.g., the identification of timings of the cardiac cycle in seismocardiography, require higher temporal resolutions. Therefore, we introduce a method derived from a feasibility study to determine deviations and factors influencing the merging of signals simultaneously recorded with different modalities.

Proximity-based haptic feedback for collaborative robotic needle insertion

Till Robin Mieling, Carolin Stapper, Stefan Gerlach, Maximilian Neidhardt, Sarah Latus, Martin Gromniak, Philipp Breitfeld & Alexander Schlaefer
Collaborative robotic needle insertions have the potential to improve placement accuracy and safety, e.g., during epidural anesthesia. Epidural anesthesia provides effective regional pain management but can lead to serious complications, such as nerve injury or cerebrospinal fluid leakage. Robotic assistance might prevent inadvertent puncture by providing haptic feedback to the physician. Haptic feedback can be realized on the basis of force measurements at the needle. However, contact should be avoided for delicate structures. We propose...

Stop waiting : mitigating varying connecting times for infrastructure WiFi nodes

Lars Hanschke, Jan Heitmann & Bernd-Christian Renner

A case for chirp modulation for low-power acoustic communication in shallow waters

Jan Heitmann, Fabian Steinmetz & Bernd-Christian Renner

Resilience against shipping noise and interference of the AHOI acoustic underwater modem

Fabian Steinmetz & Bernd-Christian Renner
Underwater Wireless Sensor Networks (UWSNs) and micro Autonomous Underwater Vehicles (µAUVs) enable diverse underwater monitoring and service applications; e. g., observation of water quality or identification of pollution. Reliable underwater communication for data transmission between sensors, µAUVs and base stations is required. The smartPORT acoustic underwater modem AHOI is a small, low-power and low-cost modem, which was developed for these applications. This paper evaluates the modem’s resilience against shipping noise and packet interference in UWSNs....

Study on the interaction of nonlinear water waves considering random seas

Marten Hollm, Leo Dostal, Hendrik Fischer & Robert Seifried
The nonlinear Schrödinger equation plays an important role in wave theory, nonlinear optics and Bose-Einstein condensation. Depending on the background, different analytical solutions have been obtained. One of these solutions is the soliton solution. In the real ocean sea, interactions of different water waves can be observed at the surface. Therefore the question arises, how such nonlinear waves interact. Of particular interest is the interaction, also called collision, of solitons and solitary waves. Using a...

Nonlinear system identification of a furuta pendulum using machine learning techniques

Tobias Rückwald, Svenja Drücker, Daniel-André Dücker & Robert Seifried
Usually, dynamical systems can be described by differential equations. An accurate model is essential when designing and optimizing a controller. However, not every system can be modeled easily by physical models due to highly nonlinear behavior, such as friction or backlash. Then, a data based approach, such as machine learning, might be helpful. The focus in this work is set on modeling dynamical systems using neural networks and deep learning, which are growing subjects in...

Criteria for selecting design process modelling approaches

Jakob Trauer, Ferdinand Wöhr, Claudia Eckert, Udo Kannengiesser, Sjoerd Knippenberg, Olga Sankowski & Markus Zimmermann
Process models are among the principal artefacts used for managing design projects. However, the selection of effective modelling approaches can be difficult for design project managers, given that a plethora of tools exists for various modelling purposes. In addition to date no systematic approach for the assessment and selection of process modelling approaches is available to practitioners. This paper presents the development of criteria for benchmarking and selecting different process modelling tools. The results are...

Current trends and developments of product modularisation – a bibliometric analysis

Kai Gustav Mertens, Christoph Rennpferdt, Erik Greve, Dieter Krause & Matthias Meyer
Product modularisation continuously draws attention of scholars and practitioners since it supports organizations and industries to sustain in high product and service variety at reasonable costs and greater flexibility. This paper aims at revealing current trends and developments in the field of product modularisation by identifying the intellectual structure using a bibliometric review. Our sample accrues 1,366 publications from 2016 up to 2020 across disciplines while using bibliometric coupling composes a network. Analysing the network...

Comparative study on different CFD solvers for analysis of ship added resistance

Byung-Soo Kim, Kyung-Kyu Yang, Zhang Zhu & Yonghwan Kim
This study deals with motion responses and the added resistance of the ship in waves using computational fluid dynamics (CFD). In this study, motion response and the added resistance of the modified blunt Wigley are investigated using two types of CFD program: SNU-MHL-CFD (Seoul National University Marine Hydrodynamics Laboratory CFD) and OpenFOAM. SNU-MHL-CFD is Euler equation solver which is an in-house code based on a Cartesian-grid and immersed boundary method. OpenFOAM is Reynolds-Averaged Navier-Stokes (RANS)...

Focus shift control of a novel 30 kW laser remote scanner for large-scale industrial sheet and plate metal applications

Georg Cerwenka, Jully Paternina, Mohamed Elhefnawy, Jörg Wollnack & Claus Emmelmann
To overcome current limitations in laser remote processing of large-scale sheet and plate metal applications, an automated laser remote scanner (LRS) with a 30 kW laser power has been developed. Due to the high laser power, an unacceptable focus shift occurs at the processing location, mainly generated by the fused silica optics. A computationally efficient real-time focus shift compensation and control of the focus position have been investigated and are presented. In the first section,...

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