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2. Study on the characteristics of lithium batteries with different load

Author

Ding Zuowu and Qu Min

Subjects
Battery (electricity), Engineering, business.product_category, business.industry, education, Electrical engineering, chemistry.chemical_element, Internal resistance, Battery pack, Automotive engineering, Lithium battery, chemistry, Electric vehicle, Lithium, Automotive battery, business, Lead–acid battery
Abstract

Lead-acid batteries are widely used as backup power source in wireless base stations and as power source in electric vehicles. To determine the lithium battery's terminal limited discharge voltage and internal resistance with different loads, four 3.2V/60Ah lithium batteries are put in series to form a battery pack in tests. The lithium battery pack terminal voltage, current and overall internal resistance were recorded with the discharge time. By analyzing data from the tests with MATLAB, the lithium battery pack capacity, energy consumed by the load and the internal resistance were determined. The lithium battery pack t-U, t-I, t-ΔU/Δt and t-r 0 graphs are drawn. From the graphs, it is shown that the limited discharge voltage of a single lithium battery is approximately 2.75V, and the internal resistance of a single lithium battery is approximately 0.75mΩ. The lithium battery pack current and the voltage change trends are the same when the load is constant, and the higher the load the less capacity the lithium battery pack can release. The energy consumed by internal resistance to the energy that lithium battery releases is higher as the load increases

Published
2011

3. Study about lithium battery's characteristics

Author

Wang Shu-lin, Zhao Wei-jun, Ding Zuowu, and Qu Min

Subjects
Trickle charging, Battery (electricity), Materials science, business.industry, Electrical engineering, chemistry.chemical_element, Internal resistance, Battery pack, Lithium battery, chemistry, Lithium, Automotive battery, business, Voltage
Abstract

To make certain the lithium battery's terminal limited discharge voltage and internal resistance in different load, four 3.2V/60Ah lithium batteries are put in series to form battery pack in tests. The lithium battery pack terminal voltage, current and overall internal resistance were recorded with the discharge time. By analyze datas from the tests with MATLAB, the lithium battery pack capacity, energy consumed by the load and internal resistance are figured out, lithium battery pack t-U, t-I, t-ΔU/Δt and t-r 0 graphs are drawn. From the graphs, we can draw that the limited discharge voltage of a single lithium battery is about 2.75V, the internal resistance of a single lithium battery is about 0.75mΩ, the lithium battery pack current and the voltage change trends are the same when the load keeps changeless, the higher load the less capacity lithium battery pack can release, the energy comsumed by internal resistance to the energy that lithium battery release is higher as the load increase. All the conclutions can do good to develop battery management system.

Published
2010

4. An investigation of statistical distribution properties in reverberation chamber

Author

Guan Yalin, Lin Jin-cai, Qu Min, Wang Yue, and Lu Guizhen

Subjects
Engineering, business.industry, Electronic engineering, Range (statistics), Probability distribution, Statistical model, Probability density function, Function (mathematics), business, Weibull distribution, Electromagnetic reverberation chamber, Computational physics, Power density
Abstract

In the paper, the measurements for statistical model in the reverberation chamber (RC) are presented. The model of probability density function (PDF) is studied. The results of measurements are analyzed with respect to the corresponding ideal theoretical model. The function is observed over a frequency range that allows for the conditions in the chamber to vary from under-moded operation to overmoded operation (1 GHz- 9 GHz). Ultimately, the paper states that the distribution of the field power density at the certain position in the RC fits a Weibull distribution.

Published
2008

5. The design of diversity receiving in Rerverberation Chamber

Author

Qu Min, Lu Guizhen, and Guan Yalin

Subjects
Signal variance, Computer science, Acoustics, Electronic engineering, Variance (accounting), Antenna (radio), Antenna diversity, Diversity (business), Electromagnetic reverberation chamber
Abstract

In this paper, the diversity techniques in reverberation chamber is firstly presented. With the introduction of space diversity, by using multi-receiving antenna, we can get more effective signals and greatly reduce the variance. Through comparing the results of non-diversity with the ones of diversity, it is tested that diversity techniques can improve the signal variance of Reverberation Chamber.

Published
2008

13. An initial comparison of selected Earth departure options for solar electric propulsion missions.

Author

Merrill, Raymond Gabriel, Komar, D. R., Qu, Min, Chrone, Jon, Strange, Nathan, and Landau, Damon

Abstract

Earth departure options such as the location for deployment, aggregation, and crew rendezvous as well as the type of propulsion leveraged for each mission phase effect overall mission performance metrics such as number of critical maneuvers, mass of propellant to achieve departure, and initial mass required in low Earth orbit. This paper identifies and compares a subset of tactical options for deployment, crew rendezvous, and Earth departure that leverage electric propulsion and hybrid chemical electric propulsion with a goal of improving system efficiency. Departure maneuver specific limitations and penalties are then identified for missions to specific targets for human interplanetary missions providing a better understanding of the impact of decisions related to aggregation and rendezvous locations as well as Earth departure maneuvers on overall system performance. [ABSTRACT FROM PUBLISHER]

Published
2012
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16. CEOS Visualization Environment (COVE) Tool for Intercalibration of Satellite Instruments.

Author

Kessler, Paul D., Killough, Brian D., Gowda, Sanjay, Williams, Brian R., Chander, Gyanesh, and Qu, Min

Subjects
ARTIFICIAL satellites, CALIBRATION, PHYSICAL measurements, IPADS
Abstract

Increasingly, data from multiple instruments are used to gain a more complete understanding of land surface processes at a variety of scales. Intercalibration, comparison, and coordination of satellite instrument coverage areas is a critical effort of international and domestic space agencies and organizations. The Committee on Earth Observation Satellites Visualization Environment (COVE) is a suite of browser-based applications that leverage Google Earth to display past, present, and future satellite instrument coverage areas and coincident calibration opportunities. This forecasting and ground coverage analysis and visualization capability greatly benefits the remote sensing calibration community in preparation for multisatellite ground calibration campaigns or individual satellite calibration studies. COVE has been developed for use by a broad international community to improve the efficiency and efficacy of such calibration planning efforts, whether those efforts require past, present, or future predictions. This paper provides a brief overview of the COVE tool, its validation, accuracies, and limitations with emphasis on the applicability of this visualization tool for supporting ground field campaigns and intercalibration of satellite instruments. [ABSTRACT FROM PUBLISHER]

Published
2013
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