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We present a simulation data-based efficiency approximation for radial turbocompressors, which is implemented in the well-known Cordier diagram.
A sophisticated CAE workflow is used to calculate the operational characteristics of 50 machine designs with 50 impeller geometry variations each.
A Kriging-based surrogate model is trained to approximate the efficiency of any machine designs' best geometry design.
The models are implemented into a machine design workflow.
As a result, duty-specific Cordier lines are introduced. They are automatically generated for a set of machine design parameters.
The efficiency of the designs along the duty-specific Cordier lines is approximated.
Using optimization techniques, an optimal compressor design for the given duty on every specific Cordier line may be identified.
This highly increases the amount of information available in the early design stages for radial turbocompressors.
We present an approximation model for the chord length of radial turbocompressors. The model enables the calculation of a compressor's chord Reynold's number during the machine design process. The chord Reynold's number is shown to be the most accurate representation of the fluid dynamic properties inside the radial turbocompressor's impeller. It — however — requires the computation of the chord length, which is only available after defining the final impeller geometry. The method presenting in this paper only employs the compressors principal dimensions to approximate the chord length. The chord is modelled using a Bézier spline and quarter ellipse. This enables the earlier use of the chord Reynold's number during the machine design process of radial turbocompressors.
This thesis presents a power simulation of a MIPS MicroAptiv UP Core implemented as
a virtual ASIC prototype using Taiwan Semiconductor Manufacturing Company(TSMC)
65 nm CMOS technology. Based on the MIPS instruction set program data is generated
and introduced in the simulation by means of initialization files. Before the simulation,
technology specific SRAM modules are integrated into theMIPS core. Two different programs
are used for power characterization. The first program performs frequent memory
accesses by means of load/store word instructions, while the second program is a loop
which operates on registers only and mainly increments addresses. The simulation is
based on a virtual prototype which is generated by synthesis and place & route including
post-layout parasitic extractions. The stimuli for the power extraction is generated
via gate-level simulation and forwarded to the power calculation engine. The effect of X-propagation
on gate-level simulations is avoided by modifying the address-related statements
in the execution data path module, which use another form of 2 to 1 multiplexer,
setting the output to zero for all input signals even with an initial value of ’x’ without
changing the functionality. Finally, the consumed power is provided by reports generated
by the power simulation engine. The memory-centric program consumes 35.39mW
of internal power using instructions, which is 0.73mW less than the internal power of the
register-centric program, and the overall average power is also lower by almost 0.7mW.
Learn techniques for estimating the cost of usability activities and measuring improvements based on hundreds of development projects and 72 case studies. We present techniques for converting usage metrics into business gains for different industries (e.g., intranets, e-commerce, marketing, software, and electronics and hardware products).
This 212-page report includes 131 screenshots of before and after designs, and discussions of design elements that increase business metrics.
Forschungsbericht
Projektleiter: Uwe Großmann
Forschungsschwerpunkt: Mobile Business Mobile Systems
Zeitraum: 2004-2008
Mitarbeiter: Sebastian Gansemer, Oliver Suttorp
Förderung: Bundesministerium für Bildung und Forschung: Anwendungsorientierte Forschung und Entwicklung an Fachhochschulen (aFuE) Verbundprojekt
Projektpartner: RWE-Museum "Strom und Leben", Recklinghausen: Hanswalter Dobbelmann
This article focuses on the development of class-specific inequalities within German universities. Based on data on the social origin of students, doctoral students, and professors in the long-term cross-section, the article views the empirically observable dynamic of social closure of higher education since the 1950s. The focus of interest is on the level of the professorship. Data show that career conditions for underprivileged groups have deteriorated again. This finding is discussed in the context of social closure theories. The article argues that closure theories consider social closure processes primarily as intentional patterns of action, aimed at a strategic monopolization of participation, and securing social power. Such an analytical approach means that unintended closure processes remain understudied. Our conclusion is that concealed modes of reproduction of social structures ought to be examined and theorized more intensively due to their importance for the elimination of social inequality within universities.