| 1. |
- Amann, Daniel, 1967-, et al.
(författare)
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Affordability aspects in the concept generation of defence systems
- 2017
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Ingår i: Proceedings of 18th International CINet Conference. - Twente : Continuous Innovation Network. - 9789077360200 ; , s. 26-38
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Cost escalation for fighter aircraft is arguably not sustainable. Pushing frontiers oftechnology by incremental improvements of traditional platforms has led to anexponential increase in cost. This paper addresses the process of concept generationwith the purpose to explore how affordability is managed in that process, in order toidentify possible measures to improve the likelihood of generating affordableconcepts. This is done by studying two cases of concept generation of future combatair systems. The concepts generated in these two cases are however not curbing thecost escalation and are, with only one notable exception, based on incrementalinnovation. Nevertheless, the empirical observations offer leads to potentially fostera more innovative and cost conscious concept generation process, indicatingavenues for future research.
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| 2. |
- Amann, Daniel, et al.
(författare)
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Inducing Affordability?: Observations From An Experimental Study Of Concept Generation
- 2021
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Ingår i: Proceedings of the 22th CINet conference, September 12 – 14, Gothenburg, Sweden. - Enschede. - 9789077360248
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Konferensbidrag (refereegranskat)abstract
- Early preliminary concepts are claimed to have a profound impact on the final product. Since these concepts often are based on intuitive judgements, it is important that these judgements are appropriate for the desired outcome. Intuition is derived from what one brings to mind, and consequently, the access to information is important for making relevant judgements. Therefore, when a departure from a present path of development is sought for, access to new information is likely to be required. Results from an experimental study, addressing affordability and concept generation, indicated that individuals were influenced, by the provision of selective information, to make more cost considerations and even to change approach when generating new concepts. It was further recognized that weak abilities to estimate costs in a lifecycle and capability perspective likely hampered low-cost ambitions. The findings from this study are suggested to contribute to theory on product development, and to support affordability when new products are developed.
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| 3. |
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| 4. |
- Andreas, Molnar, et al.
(författare)
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Isbrytning med svävarfarkoster
- 1979
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Consumer report ("avnämarrapport" in Swedish) for a research foundation (Styrelse för Teknisk Utveckling STU Stockholm eller Transportforskningsdelegationen TDF Stockholm). A comment: As was the praxis during this (early) period of time at Chalmers University of Technology, as well as probably at some other universities. This means that frequent and vast academic publication by means of e.g. conference papers and refereed contributions to scientific journals was almost unheard of. At least so for some of the applied science disciplines (today are the situation indeed very different) (i.e. earlier was the publication in many respects focused on trying to satisfy the executive administrator the research foundation in question).
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| 5. |
- Angenendt, Knut, 1982, et al.
(författare)
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Ionic liquid structures from large DFT calculations using mindless configurations
- 2010
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Ingår i: Journal of Physical Chemistry C. - : American Chemical Society (ACS). - 1932-7447 .- 1932-7455. ; 114:48, s. 20577-20582
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Tidskriftsartikel (refereegranskat)abstract
- Three different popular imidazolium based ionic liquids (ILs); EMI-BF4, EMI-PF6, and EMI-TFSI, have been modeled by DFT calculations (B3LYP/6-311+G*) using large, up to 130 atom cluster models, for a better understanding of the structure and ion ion interactions in these ILs and ILs in general. Particular emphasis has been put on the role of appropriate starting structures and how the present large models differ from the ion-pair models of ILs generally used. The system size normalized ion ion interaction energies are shown to converge rapidly, and conformational equilibria and higher order properties like IR spectra are shown to be valuable as quality criteria. The explicit inclusion of an IL environment by the large cluster approach is also compared to using an implicit, continuum, strategy via SCRF C-PCM calculations.
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| 6. |
- Bengtsson, Lars, 1963
(författare)
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Avancerad Elektrisk Mätteknik
- 1996
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Bok (övrigt vetenskapligt/konstnärligt)abstract
- Boken är avsedd för fortsättnigskurser i elektrisk mätteknik på högskolenivå. Den lämpar sig också väl som kompletteringslitteratur för kurser i signalbehandling. Innehållet är framför allt koncentrerat till analog och digital frekvensanalys, brusreducerande mätmetoder och AD/DA-omvandlingsmetoder. Ett kapitel tar upp signalbehandling och sambanden mellan analys i tid och rum. Fouriertransformen och faltningsintegralen gås igenom i detalj. Boken avslutas dels med ett kapitel om snabba förlopp i transmissionsledningar, dels med ett kapitel om GPIB-bussen. I appendix finns även en beskrivning av RS-232-kommunikation.
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| 7. |
- Bengtsson, Lars, 1963
(författare)
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Electrical Measurement Systems and Methods
- 2014
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Bok (övrigt vetenskapligt/konstnärligt)abstract
- This book treats a wide range of aspects on electrical measurement systems and the methods used to acquire data from electronic systems. That includes sensors and sensor design, amplifiers such as differential and charge amplifiers, ADCs and DACs, digital oscilloscopes, cable theory and probes, noise and noise coupling, common and normal mode signals. This first part (chapters 1-8) doesn’t require any advanced mathematics and is aimed towards undergraduates. The second part (chapters 9-17) is on an advanced level (master level) and treats transform theory (Fourier, Laplace, z) and how to handle signals in frequency space. We cover the sampling theorem (Nyquist), resolution bandwidth, frequency spectrum distortions like aliasing and leakage and how to apply windows in a frequency spectrum. We also cover systems and signal processing in time-space, including convolution and correlation, filter theory and filter design (both analog and digital). The last chapters concern the statistical aspects on measurement systems and signals, like point and interval estimations, curve fitting and uncertainty estimations according to the GUM method.
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| 8. |
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| 9. |
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| 10. |
- Capaci, Francesca, et al.
(författare)
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Simulating and Analyzing Experiments in the Tennessee Eastman Process Simulator
- 2015
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Ingår i: ENBIS-15.
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Konferensbidrag (refereegranskat)abstract
- In many of today’s continuous processes, the data collection is usually performed automatically yielding exorbitant amount of data on various quality characteristics and inputs to the system. Moreover, such data are usually collected at high frequency introducing significant serial dependence in time. This violates the independent data assumption of many industrial statistics methods used in process improvement studies. These studies often involve controlled experiments to unearth the causal relationships to be used for robustness and optimization purposes.However real production processes are not suitable for studying new experimental methodologies, partly because unknown disturbances/experimental settings may lead to erroneous conclusions. Moreover large scale experimentation in production processes is frowned upon due to consequent disturbances and production delays. Hence realistic simulation of such processes offers an excellent opportunity for experimentation and methodological development.One commonly used process simulator is the Tennessee Eastman (TE) challenge chemical process simulator (Downs & Vogel, 1993)[1]. The process produces two products from four reactants, containing 41 measured variables and 12 manipulated variables. In addition to the process description, the problem statement defines process constraints, 20 types of process disturbances, and six operating modes corresponding to different production rates and mass ratios in the product stream.The purpose of this paper is to illustrate the use of the TE process with an appropriate feedback control as a test-bed for the methodological developments of new experimental design and analysis techniques.The paper illustrates how two-level experimental designs can be used to identify how the input factors affect the outputs in a chemical process.Simulations using Matlab/Simulink software are used to study the impact of e.g. process disturbances, closed loop control and autocorrelated data on different experimental arrangements.The experiments are analysed using a time series analysis approach to identify input-output relationships in a process operating in closed-loop with multivariate responses. The dynamics of the process are explored and the necessary run lengths for stable effect estimates are discussed.
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