SUPPLEMENT Clark, Adam J.; Weiss, Steven J.; Kain, John S. ...
Bulletin of the American Meteorological Society,
01/2012, Letnik:
93, Številka:
1
Journal Article
Permanent magnet synchronous motor (PMSM) gains popularity in the driving system of electrical vehicle because of its properties such as small volume, high efficiency and high power density. But, for ...the flux is excited by the permanent magnet, we cannot enhance rotating speed by decreasing the exciting flux linkage when the speed is bigger than based speed. This paper presents a way to control PMSM in the full speed region. Below the based speed, using space vector control method to get fast following performance. In the field weakening area, by regulating the leading phase angle the speed region of PMSM is expanded. At last, this paper presents a way to eliminate the overshoot during deceleration process with PI controller with changeable parameters to improve the control performance. The simulation results prove the effectiveness of the control strategy.
By simulating atmospheric deposition experiment, this paper analyzed the relationship between the measured spectral reflectance and the concentrations of contaminants in the snow. It is found that ...the visible spectrum is sensitive to snow contaminants. From 350nm to 850nm, with the increase concentrations of contaminants in snow, snow reflectivity dramatically decreases. We get the conclusion that the most sensitive bands to snow contaminants are 384nm, 450nm and 1495nm.Using the non-linear regression method to analyze the relationship between spectral reflectance and the contaminants. The results showed the reflectivity of snow at visible bands logarithmically decreases with the snow contaminants increasing; the R 2 can reach 0.9.To the contrary, the spectral reflectance at nearinfrared increases with the snow contaminants increasing. Therefore, this method can be combined satellite image to forecast the contaminants in the snow at large-scale.
La lombalgie est un des problèmes majeurs des conducteurs de portique à conteneurs. Dans le but d’améliorer leurs conditions de travail, le projet SUPERCABINE a été initié pour définir un cahier des ...charges utile tant pour la transformation des cabines existantes que pour la conception des cabines futures. Cet article concerne une partie du projet, soit l’analyse de l’inconfort postural et l’aménagement spatial du poste de conduite. Il a pour objectif de présenter la méthodologie mise en œuvre ainsi que les principaux résultats sous forme de recommandations. Une approche globale a été mise en œuvre incluant une analyse ergonomique du travail, deux enquêtes sur le terrain et une analyse détaillée d’un poste de conduite existant par simulation numérique. Les recommandations portent essentiellement sur la forme et la position des deux pupitres, l’emplacement des deux principales manettes de commande, la plage de réglage du siège et du repose-pied, ainsi que le champ de vision nécessaire. L’apport de la simulation par un mannequin numérique, ainsi que ses limites dans le processus d’évaluation et de conception d’un poste de travail sont également discutés.
Low back pain is one of the main problems experienced by gantry container crane operators. To improve their working conditions, the SUPERCABINE project set itself the task of laying down an effective specification for modifying existing cabs and designing new ones. This paper deals with one part of the project, the analysis of postural discomfort and the workplace design of the cab. Its aim is to describe the methodology that was employed and provides an account of the principal findings, which take the form of recommendations. A comprehensive approach was adopted that included an ergonomic analysis of the work, two field surveys and a detailed analysis involving a digital simulation of an existing cab. The recommendations mainly relate to the form and position of the two control desks, the position of the two main joysticks, the adjustment range of the seat and footrest, and the necessary field of vision. The contribution and limits of simulation using a digital human model in the context of the workplace evaluation and design process are also discussed.
