Development of the Travelling Wave Bioreactor. Part I: Design Studies Based on Numerical Models

2015 ◽  
Vol 88 (1-2) ◽  
pp. 77-85 ◽  
Author(s):  
Stephan C. Kaiser ◽  
Matthias Kraume ◽  
Dieter Eibl
Keyword(s):  
Numerical Models ◽  
Travelling Wave ◽  
Design Studies ◽  
Wave Bioreactor

Development of the Travelling Wave Bioreactor. Part II: Engineering Characteristics and Cultivation Results

2015 ◽  
Vol 88 (1-2) ◽  
pp. 86-92 ◽  
Author(s):  
Stephan C. Kaiser ◽  
Nadezda Perepelitsa ◽  
Matthias Kraume ◽  
Dieter Eibl
Keyword(s):  
Travelling Wave ◽  
Engineering Characteristics ◽  
Wave Bioreactor

A Test Rig for Non-Contact Travelling Wave Excitation of a Bladed Disk With Underplatform Dampers

2010 ◽  
Author(s):  
Teresa Berruti ◽  
Christian M. Firrone ◽  
Muzio M. Gola
Keyword(s):  
Numerical Models ◽  
Experimental Tests ◽  
Calibration Procedure ◽  
Travelling Wave ◽  
Forced Response ◽  
Wave Excitation ◽  
Test Rig ◽  
Response Measurement ◽  
Static Test ◽  
Bladed Disk

The paper presents a static test rig called “Octopus” designed for the validation of numerical models aimed at calculating the nonlinear dynamic response of a bladed disk with underplatform dampers (UPDs). The test rig supports a bladed disk on a fixture and each UPD is pressed against the blade platforms by wires pulled by dead weights. Both excitation system and response measurement system are noncontacting. The paper features the design and the set-up of the noncontacting excitation generated by electromagnets placed under each blade. A travelling wave excitation is generated according to a desired engine order by shifting the phase of the harmonic force of one electromagnet with respect to the contiguous exciters. Since the friction phenomenon generated by UPDs introduces nonlinearities on the forced response, the amplitude of the exciting force must be kept constant at a known value on every blade during step-sine test to calculate Frequency Response Functions. The issue of the force control is therefore addressed since the performance of the electromagnet changes with frequency. The system calibration procedure and the estimated errors on the generated force are also presented. Examples of experimental tests that can be performed on a dummy integral bladed disk (blisk) mounted on the rig are described in the end.

Development of the Travelling Wave Bioreactor - A Concept Study

2012 ◽  
Vol 85 (1-2) ◽  
pp. 136-143 ◽  
Author(s):  
Stephan C. Kaiser ◽  
Matthias Kraume ◽  
Dieter Eibl
Keyword(s):  
Travelling Wave ◽  
Concept Study ◽  
Wave Bioreactor

scholarly journals Experimental realization of dynamo action: present status and prospects

2012 ◽  
Vol 8 (S294) ◽  
pp. 411-416
Author(s):  
André Giesecke ◽  
Frank Stefani ◽  
Thomas Gundrum ◽  
Gunter Gerbeth ◽  
Caroline Nore ◽  
...  
Keyword(s):  
Numerical Models ◽  
Close Relation ◽  
Liquid Sodium ◽  
Dynamo Action ◽  
Experimental Examination ◽  
Design Studies ◽  
Experimental Realization ◽  
Great Progress ◽  
Set Up ◽  
Iron Material

AbstractIn the last decades, the experimental study of dynamo action has made great progress. However, after the dynamo experiments in Karlsruhe and Riga, the von-Kármán-Sodium (VKS) dynamo is only the third facility that has been able to demonstrate fluid flow driven self-generation of magnetic fields in a laboratory experiment. Further progress in the experimental examination of dynamo action is expected from the planned precession driven dynamo experiment that will be designed in the framework of the liquid sodium facility DRESDYN (DREsden Sodium facility for DYNamo and thermohydraulic studies).In this paper, we briefly present numerical models of the VKS dynamo that demonstrate the close relation between the axisymmetric field observed in that experiment and the soft iron material used for the flow driving impellers. We further show recent results of preparatory water experiments and design studies related to the precession dynamo and delineate the scientific prospects for the final set-up.

scholarly journals AN INTEGRATED AND INTERACTIVE TOOLBOX FOR THE DESIGN OF COASTAL INFRASTRUCTURE

2018 ◽  
pp. 101
Author(s):  
Freek Scheel ◽  
Wiebe De Boer ◽  
Arjen Luijendijk ◽  
Ronald Stive ◽  
Ruud Bouw
Keyword(s):  
Engineering Design ◽  
Numerical Models ◽  
Coastal Engineering ◽  
Proof Of Concept ◽  
Physical Processes ◽  
Detailed Design ◽  
Design Studies ◽  
Empirical Relations ◽  
Project Phases ◽  
Integration Of Disciplines

Coastal engineering design studies often rely on detailed numerical models that involve various mono-disciplinary physical processes, complex numerics and large computational demands. As a consequence, these models are particularly useful to address specific questions that arise during project phases focusing on detailed design. In contrast, during early project phases focusing on project feasibility, proof-of-concept and preliminary engineering efforts, these detailed numerical models suffer from their aforementioned characteristics. Now, aspects such as interactivity, flexibility and multi-disciplinary assessment are of importance. Simple yet fast tools and empirical relations offer a lot of potential to fill this gap, but are typically not as systematically developed as detailed numerical models. This results in a deficit in consistent integration of disciplines, robustness, interactivity and potential flexibility.

Influence of the basilar membrane shape and mechanical properties in the cochlear response: A numerical study

2021 ◽  
pp. 095441192110034
Author(s):  
Bruno Areias ◽  
Marco Parente ◽  
Fernanda Gentil ◽  
Renato Natal Jorge
Keyword(s):  
Mechanical Properties ◽  
Root Mean Square ◽  
Basilar Membrane ◽  
Numerical Study ◽  
Numerical Models ◽  
Transversely Isotropic ◽  
Travelling Wave ◽  
Mean Square ◽  
Spiral Model ◽  
Mean Square Errors

Hearing impairment is one of the most common health disorders, affecting individuals of all ages, reducing considerably their quality of life. At present, it is known that during an acoustic stimulation a travelling wave is developed inside the cochlea. Existing mathematical and numerical models available in the literature try to describe the shape of this travelling wave, the majority of them present a set of approaches based on some limitations either or both of the mechanical properties used and the geometrical description of the realistic representation. The present numerical study highlights the distinctions of using a spiral model of the cochlea, by comparing the obtained results with a straight, or simplified model. The influence of the implantation of transversely isotropic mechanical models was also studied, by comparing the basilar membrane with isotropic and transversely isotropic mechanical properties. Values of the root mean square error calculated for all models show a greater proximity of the cochlear mapping to the Greenwood function when the basilar membrane is assumed with transversely isotropic mechanical properties for both straight and spiral model. The root-mean square errors calculated were: 2.05, 1.70, 2.72, 2.08 mm, for the straight-isotropic, straight-transversely isotropic, spiral-isotropic and spiral-transversely isotropic model, respectively.

Using Video Modeling Intervention and Speech Generating Devices To Teach Requesting Behaviors to Persons With Autism

2011 ◽  
Vol 20 (4) ◽  
pp. 109-113
Author(s):  
Karen Copple ◽  
Rajinder Koul ◽  
Devender Banda ◽  
Ellen Frye
Keyword(s):  
Developmental Disabilities ◽  
Experimental Design ◽  
Communication Skills ◽  
Observational Learning ◽  
Video Modeling ◽  
Single Subject ◽  
Design Studies ◽  
Communicative Behaviors ◽  
Speech Generating Device ◽  
Treatment Package

Abstract One of the instructional techniques reported in the literature to teach communication skills to persons with autism is video modeling (VM). VM is a form of observational learning that involves watching and imitating the desired target behavior(s) exhibited by the person on the videotape. VM has been used to teach a variety of social and communicative behaviors to persons with developmental disabilities such as autism. In this paper, we describe the VM technique and summarize the results of two single-subject experimental design studies that investigated the acquisition of spontaneous requesting skills using a speech generating device (SGD) by persons with autism following a VM intervention. The results of these two studies indicate that a VM treatment package that includes a SGD as one of its components can be effective in facilitating communication in individuals with autism who have little or no functional speech.

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