Wyniki wyszukiwania - Biblioteka Nauki

1

Experiment and analysis of high power line-start PM motor

100%

Lu Q. , Huang X. , Ye Y. , Fang Y.

Przegląd Elektrotechniczny

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2012

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tom R. 88, nr 2

274-277

EN

This paper investigates the performance of a high power line-start permanent-magnet motor (LSPM) by experiment, which is developed for industrial fans, pumps and compressors to reduce the energy consumption. The no-load back-EMF is measured and compared with predicted result of FEM. In order to assess the line starting ability, the rotor-locked test is carried out and then the starting torque ratio is deduced which is lower than that of induction motor of the same power. By adjusting the load, the efficiency and power factor during all operation condition are obtained. It is found this proposed LSPM has not only higher power factor and efficiency, but also high overload ability. After its starting ability of reduced voltage is analyzed, several useful methods are pointed out for designing high power LSPM which should start with limited current.

PL

Zbadano właściwości silnika wysokiej mocy LSPM w zastosowaniu przemysłowym do pomp, wentylatorów i kompresorów pod kątem redukcji zużycia energii. Zbadano silnik przy zablokowanym wirniku i na tej podstawie przewidywano moment startowy. Przy zmianie obciążenia określono współczynnik mocy i sprawność.

2

Analysis and measure of novel stereo-garage driven by linear induction motor

100%

Lu Q. , Ye Y. , Shen J.

Archives of Electrical Engineering

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2015

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tom Vol. 64, nr 4

669--678

EN

The car access time is a key parameter, especially in a huge stereo-garage, where this one should be decreased as much as possible. This paper proposes a novel stereo-garage. Adopting the linear induction motors (LIMs), the system has a simple structure and rapid response capability. In the stereo-garage, several LIMs are installed below the crossbeam on a lifting platform, and several LIMs are fixed on the top of a moving frame. During the operation of LIMs, the moving frame moves forward and backward to reach the required parking place, whereas the crossbeam moves horizontally in order to take or store the vehicle rapidly. All these LIMs are the same and should be designed at a low frequency. The influences of key structure parameters and dynamic performances are investigated, based on FEM. The predicted results are validated by a prototype. Finally, the designed LIMs are successfully applied in two 8-layer stereo-garages.

3

Performance Investigation of Induction Heater

100%

Lu Q. , Huang X. , Ye Y. , Fang Y.

Przegląd Elektrotechniczny

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2012

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tom R. 88, nr 9a

277-280

EN

To achieve high and even-distributed temperature of the rotatory part, an induction heater is designed and its performance of different structure is investigated. By the erected electromagnetic model, structure parameters including height, length and position of induction copper layer are optimized. Its temperature distribution is obtained based on another coupled-field model combining electromagnet field with temperature field. The predicted results show not only the steady temperature distribution, but also the temperature dynamic variation, which are also validated by the prototype measurement. Since the test temperature can almost keep constant and uniform with corresponding temperature controller, the proposed induction heater meets the design requirement.

PL

Zaprojektowano nagrzewnicę indukcyjną do nagrzewania ruchomych elementów. Optymalizowano parametry, takie jak wysokość, długość I pozycja wartwy miedzianej.

4

Selection of land cover by the Tibetan fox Vulpes ferrilata on the Eastern Tibetan Plateau, Western Sichuan Province, China

100%

Wang Z. , Wang X. , Lu Q.

Acta Theriologica

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2007

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tom 52

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nr 2

EN

Habitat loss is one of the main factors impacting endangered wildlife in China. The Tibetan foxVulpes ferrilata Hodgson, 1842 is a characteristic species of the Tibetan Plateau. However, its habitat use is poorly known. We conducted a project (2001–2003) to better understand habitat use by the Tibetan fox in Shiqu County, Sichuan Province, China. The research site was classified into four land cover categories: grassland, grassland and shrubs, shrubs, and disturbed area (more than half of the area in a plot covered by bare soil and gravel). Their proportional share in land cover categories was estimated by line transects and used as expected land cover. Plots were also located at fox locations, fox dens, and fox feces (hereafter “fox plots”). Using Bonferroniz-statistics, land cover proportions in fox plots were compared with the expected land cover proportions. Tibetan foxes were found primarily in grassland habitat and there was evidence of use of grassland/shrub habitat and disturbed area. However, the fox were rarely observed in shrubs. Two reasons for this are: (1) the need of prey, pika, which mainly lives in open areas; (2) the requirement of security from natural enemies.

5

Effects of pretreated ozone and modified atmosphere packaging on the quality of fresh-cut green asparagus

100%

An J. , Zhang M. , Lu Q.

International Agrophysics

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2006

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tom 20

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nr 2

6

Fatigue life prediction of umbilicals considering non-linear stress

75%

Lu Q. , Yin Y. , Yang Z. , Chen J. , Yan J. , Yue Q.

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2017

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tom S 2

154--163

EN

The fatigue problem induced by wave loads and floater movements of dynamic umbilicals in deepwater is studied. The prediction method of the fatigue life is investigated by considering no-linear local stress due to contact and friction between components of the umbilical. A case study of a dynamic umbilical for 1500 meters depth in South China Sea was presented. The results showed that the more accurate result of the fatigue life was calculated by considering non-linear local stress. The fatigue life by considering local stress with the no-slip assumption was conservative. An obviously longer fatigue life was obtained by considering local stress with the full-slip assumption.

7

Diversity and composition of wetland communities along an agricultural drainage ditch density gradient

75%

LU T. , Ma K. , FU B. , Zhang J. , Lu Q. , Hudson S.

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nr 1

113-123

EN

Agricultural drainage ditches are a reflection of the disturbance caused by agriculture and other human perturbations associated with agricultural activities, and the density of them can be seen as an important gradient reflecting local disturbance. However, no studies to date have examined the changes in wetland communities in relation to drainage ditch densities, yet such information is urgently needed for the conservation of wetland ecosystems facing intensive cultivation. In this paper, we inventoried 67 plots at four wetland mosaics with the ditch density values ranged 0–3.6 km km⁻² in the Sanjiang Plain, and the species richness, composition and diversity were compared among those four sites. Linear regression was used to explore relationships between wetland community pattern and agricultural ditch density, and the results show that there is significant relationship (r² = 0.56, P <0.001). The diversity comparisons show that there exist a clear negative relationship between ditch density and species diversity indices, and the species diversity did not differ greatly among sites, but species composition varied considerably. With increasing ditch density, an increasing loss of indigenous wetland species paralleled with an increasing incursion of upland species. Management implication from the drainage ditches is that the density of 1.2 km km⁻² be the maximum value suitable for the protection of native wetlands in Sanjiang plain.

8

Cloning and characterization of cDNA for the Oryza sativa phosphate transporter

75%

Ming F. , Mi G. H. , Lu Q. , Yin S. , Zhang S. S. , Guo B. , Shen D. L.

Cellular and Molecular Biology Letters

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2005

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tom 10

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nr 3

9

Salicylic acid-induced antioxidant protection against low temperature in cold-hardy winter wheat

63%

Yu J. , Cang J. , Li Y. , Huang R. , Lu Q. , Wang X. , Liu L. , Xu Q. , Zhang K.

Acta Physiologiae Plantarum

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2016

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tom 38

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nr 11