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- 저자 : Kneissl, R. (검색결과 2 건)
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Juergen Kneissl,Alexander Lion,Felix Breuer,Stefan Pfund,Philipp Wagner,Thomas Ille,Carsten Intra 한국자동차공학회 2022 International journal of automotive technology Vol.23 No.1
The development of commercial vehicle technology is strongly influenced by the trends of new drives and automation. In order to develop new drive train concepts and associated operating strategies, a simulation methodology was created. It includes among others a high-level controller, the torque distributing operation strategy, various drive components, a modular vehicle dynamics model and tire models. The individual components of the methodology are structured in appropriate software tools and are linked by co-simulation methods. The modular structure of the methodology and the fixed parameter transfer allows the exchange, omission and targeted improvement of individual components. Thus, an operation strategy could be developed, which propels different vehicle concepts with optimized traction. It is based on the control allocation approach and includes besides an optimization algorithm also situation-specific weightings of different control objectives. The modular structure of the control approach allows it to be embedded in both central, integratied and decentralized, hirachical control structures. Furthermore, the control of wheel- and axle-selective drive trains as well as the control of fully electric and hybrid driveline concepts is possible with only a few modifications. The potential of the control approach as well as the methodology is demonstrated among others by the driving manoeuvre of a virtual 6 × 6 commercial vehicle with individual wheel drive in a μlow scenario.
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THE 2014 ALMA LONG BASELINE CAMPAIGN: OBSERVATIONS OF ASTEROID 3 JUNO AT 60 KILOMETER RESOLUTION
Hunter, T. R.,Kneissl, R.,Moullet, A.,Brogan, C. L.,Fomalont, E. B.,Vlahakis, C.,Asaki, Y.,Barkats, D.,Dent, W. R. F.,Hills, R. E.,Hirota, A.,Hodge, J. A.,Impellizzeri, C. M. V.,Liuzzo, E.,Lucas, R.,M IOP Publishing 2015 ASTROPHYSICAL JOURNAL LETTERS - Vol.808 No.1
<P>We present Atacama Large Millimeter/submillimeter Array (ALMA) 1.3 mm continuum images of the asteroid 3 Juno obtained with an angular resolution of 0 ''.042 (60 km at 1.97 AU). The data were obtained over a single 4.4 hr interval, which covers 60% of the 7.2 hr rotation period, approximately centered on local transit. A sequence of 10 consecutive images reveals continuous changes in the asteroid's profile and apparent shape, in good agreement with the sky projection of the three-dimensional model of the Database of Asteroid Models from Inversion Techniques. We measure a geometric mean diameter of 259 +/- 4 km, in good agreement with past estimates from a variety of techniques and wavelengths. Due to the viewing angle and inclination of the rotational pole, the southern hemisphere dominates all of the images. The median peak brightness temperature is 215 +/- 13 K, while the median over the whole surface is 197 +/- 15 K. With the unprecedented resolution of ALMA, we find that the brightness temperature varies across the surface with higher values correlated to the subsolar point and afternoon areas and lower values beyond the evening terminator. The dominance of the subsolar point is accentuated in the final four images, suggesting a reduction in the thermal inertia of the regolith at the corresponding longitudes, which are possibly correlated to the location of the putative large impact crater. These results demonstrate ALMA's potential to resolve thermal emission from the surface of main belt asteroids and to measure accurately their position, geometric shape, rotational period, and soil characteristics.</P>
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