Design of all-wheel-drive power-split hybrid configuration schemes based on hierarchical topology graph theory

Energy ◽  
2021 ◽  
pp. 122944
Author(s):  
Yalian Yang ◽  
Pengshuai Li ◽  
Huanxin Pei ◽  
Yunge Zou
Keyword(s):  
Graph Theory ◽  
Drive Power ◽  
Hierarchical Topology ◽  
Wheel Drive ◽  
Power Split ◽  
Hybrid Configuration ◽  
Topology Graph

scholarly journals Determination of the Bucket Wheel Drive Power by Computer Modeling Based on Specific Energy Consumption and Cutting Geometry

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3892
Author(s):  
Ildiko Brînaș ◽  
Andrei Andraș ◽  
Sorin Mihai Radu ◽  
Florin Dumitru Popescu ◽  
Iosif Andraș ◽  
...  
Keyword(s):  
Computer Modeling ◽  
Specific Energy ◽  
Specific Energy Consumption ◽  
Open Pit ◽  
Drive Power ◽  
Improve Energy Efficiency ◽  
Cutting Geometry ◽  
Wheel Drive ◽  
Efficiency Increase ◽  
Time Required

Starting from the general principles of material cutting, with applicability to coal and overburden excavation using bucket wheel excavators (BWEs), this paper proposes another method for calculating the drive power of the bucket wheel excavator by computer modeling. This approach required two steps. In the first step, the volume of the excavated material for one slewing movement of the boom and for a particular excavation geometry was determined, and the slewing time in the open pit coal mine was measured. In the second one, the values of the specific energy (SE) consumption for cutting were determined by laboratory tests on samples of material taken from the open pit mine. The proposed method allows for the estimation of the load of the bucket wheel drive motor by taking into account only the specific energy necessary for the cutting of the material, the excavated volume during one slewing, and the time required to excavate this volume, and not the wear coefficients of the teeth or bucket edge. This method is important for establishing the correlation between the height of the excavated slice and the slewing speed of the boom in order to optimize the drive power of the bucket wheel and thus improve energy efficiency, increase the performance of excavators, and reduce operating costs.

PLCA

2012 ◽  
pp. 63-96 ◽  
Author(s):  
Kazuko Takahashi
Keyword(s):  
Graph Theory ◽  
Computational Geometry ◽  
Spatial Data ◽  
Qualitative Data ◽  
Spatial Reasoning ◽  
Research Area ◽  
Qualitative Spatial Reasoning ◽  
Research Areas ◽  
Fruitful Research ◽  
Topology Graph

This chapter describes a framework called PLCA for Qualitative Spatial Reasoning (QSR) based on the connection patterns of regions. The goal of this chapter is to provide a simple but expressive and feasible representation for qualitative data with sufficient reasoning ability. PLCA provides a symbolic representation for spatial data using simple objects. The authors of this chapter define its expression and operations on it, and show the correspondance between the expression and a figure. PLCA also provides semantical reasoning incorporated with spatial reasoning. Moreover, it can be extended to handle shapes of regions. Throughout the study, the authors discovered many topics that relate QSR to other research areas such as topology, graph theory, and computational geometry, while achieving the research goals. This indicates that QSR is a very fruitful research area.

Defining the Space of Feasible Transmission Designs for Retrofitting a Rear-Wheel-Drive Automobile With a Power Split CVT

2019 ◽  
Author(s):  
Sean D. Vermillion
Keyword(s):  
Multiobjective Optimization ◽  
Fuel Economy ◽  
Optimization Problem ◽  
Rear Wheel ◽  
Gear Ratio ◽  
Multiobjective Optimization Problem ◽  
Nsga Ii ◽  
Feasible Set ◽  
Wheel Drive ◽  
Power Split

Abstract In this paper, we describe a strategy for modeling the feasible set of power-split continuously variable transmission (CVT) system designs for retrofitting rear-wheel-drive consumer automobiles. A design is considered feasible if it produces a higher fuel economy than the stock vehicle’s fuel economy rating. Towards modeling the feasible set of designs, we first model a vehicle with a power-split CVT system taking into account the system’s mass and CVT efficiency. In this model, the effective design variables are the mass of the transmission system, the CVT functional efficiency, and effective gear ratio defining the allowable power split through and around the CVT. We formulate the set of feasible design solutions utilizing a multiobjective optimization problem to define the boundaries of the maximum allowable system mass, minimum allowable efficiency, and minimum allowable effective gear ratio. We solve this multiobjective optimization problem using NSGA-II and fit a quadratic model to the NSGA-II results to define a surrogate model of the feasible design set. We show that this surrogate modeling approach is sufficient for predicting the feasibility of a candidate transmission design.

scholarly journals Torque Optimal Allocation Strategy of All-Wheel Drive Electric Vehicle Based on Difference of Efficiency Characteristics between Axis Motors

Energies ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 1122 ◽  
Author(s):  
Xiaogang Wu ◽  
Dianyu Zheng ◽  
Tianze Wang ◽  
Jiuyu Du
Keyword(s):  
Energy Consumption ◽  
Power System ◽  
Electric Vehicle ◽  
Driving Cycle ◽  
Drive Power ◽  
Distribution Method ◽  
Torque Distribution ◽  
Wheel Drive ◽  
Average Distribution ◽  
The Difference

All-wheel drive is an important technical direction for the future development of pure electric vehicles. The difference in the efficiency distribution of the shaft motor caused by the optimal load matching and motor manufacturing process, the traditional torque average distribution strategy is not applicable to the torque distribution of the all-wheel drive power system. Aiming at the above problems, this paper takes the energy efficiency of power system as the optimization goal, proposes a dynamic allocation method to realize the torque distribution of electric vehicle all-wheel drive power system, and analyzes and verifies the adaptability of this optimization algorithm in different urban passenger vehicle working cycles. The simulation results show that, compared with the torque average distribution method, the proposed method can effectively solve the problem that the difference of the efficiency distribution of the two shaft motors in the power system affects the energy consumption of the power system. The energy consumption rate of the proposed method is reduced by 5.96% and 5.69%, respectively, compared with the average distribution method under the China urban passenger driving cycle and the Harbin urban passenger driving cycle.

Configuration Analysis of RV Transmission Based on Topology Graph Theory

2014 ◽  
Vol 574 ◽  
pp. 103-108
Author(s):  
Yong Guo Sun ◽  
Yu Wang ◽  
Guan Long Zhang ◽  
Yun Li
Keyword(s):  
Graph Theory ◽  
Gear Tooth ◽  
Theoretical Method ◽  
Ring Gear ◽  
Topological Graph ◽  
Inverse Mapping ◽  
Topological Evolution ◽  
Gear Ring ◽  
Frame Method ◽  
Topology Graph

This paper puts forward the method of obtaining new types of RV transmission. Research shows that the topological graph can effectively express the topology unit and topological structure of RV transmission; the process that through topology degradation and evolutionary method to Obtain the RV transmission of topology map and through the topology inversion to get the new organization is practical and feasible. The topological evolution methods have tie bar evolution, tree, increasing gear tooth ring and mixing superimposed evolution. The RV transmission topology inversion is implemented by the way of gear ring, Gear meshing, the gear, the shaft, tie rod and the frame. Method was developed to get the evolutions of a variety of RV transmission, and the evolution of a graph of the inverse mapping was enumerated. The topology graph theory methods used in the RV transmission for the structure of RV transmission innovation provides an important theoretical method.

scholarly journals ТЕХНОЛОГИЧЕСКИЕ ОСОБЕННОСТИ ПОЛИВА И ПОКАЗАТЕЛИ ОЦЕНКИ ЭФФЕКТИВНОСТИ ХОДОВОЙ СИСТЕМЫ ДОЖДЕВАЛЬНОЙ МАШИНЫ «КУБАНЬ-ЛК1»

2019 ◽  
Author(s):  
A.I. Ryazantsev ◽  
A.O. Antipov ◽  
A.I. Smirnov ◽  
I.V. Malko ◽  
Y.Yu. Yevseyev
Keyword(s):  
Crop Production ◽  
Objective Assessment ◽  
Operating Conditions ◽  
Time Shift ◽  
Material Consumption ◽  
Drive Power ◽  
Operational Characteristics ◽  
Wheel Drive ◽  
Technological Means ◽  
Technical And Economic Indicators

Снижение материалоемкости машин и энергоемкости при производстве полива, в частности, дождевальной машины (ДМ) Кубань-ЛК1 , является важным направлением повышения экономической эффективности агропромышленного комплекса, поскольку экономное расходование энергетических и материальных ресурсов обеспечивает увеличение объема производства и снижение себестоимости как технологических средств орошения, так и урожая сельскохозяйственных культур. При этом технико-экономические показатели дождевальных машин определяются их конструктивно-эксплуатационными характеристиками, зависящими от основных параметров машин и от условий эксплуатации. Наиболее важными из них являются: производительность и энергоемкость. Проведенные исследования ДМ позволили установить, что снижение её производительности зачастую происходит из-за уменьшения коэффициента использования рабочего времени смены (Kсм). Его снижение определяется потерями опорной проходимости тележек машины в местах с низкой несущей способностью почвы (из-за увеличенного колеобразования) и при преодолении подъемов (из-за недостаточных сцепных свойств ходовых систем, или мощности привода). Доказывается, что наиболее объективную оценку роста технического уровня ходовых систем ДМ Кубань-ЛК1 целесообразно проводить по обобщенному показателю эффективности, определяющему оптимальные параметры колёсного движителя исходя из максимальных показателей энергетических затрат на передвижение и материалоемкости.It is proved that the reduction of material consumption of machines and energy consumption in the production of irrigation, in particular, DM Kuban-LK1, is an important direction to improve the economic efficiency of agriculture, as economical consumption of energy and material resources provides an increase in production and cost reduction, as technological means of irrigation and crop production. At the same time, technical and economic indicators of sprinkler machines are determined by their structural and operational characteristics, depending on the main parameters of the machines and on the operating conditions. The most important of them are: productivity and energy intensity. Conducted research DM has allowed to establish that the decline in performance often occurs due to the reduction in utilization of working time shift (KSM). Its reduction is determined by the losses of the supporting patency of the carts in places with low bearing capacity of the soil (due to increased rutting) and when overcoming climbs (due to insufficient coupling properties of running systems, or drive power). It is proved that the most objective assessment of the growth of the technical level of running systems DM Kuban-LK1 is advisable to carry out a generalized indicator of the effectiveness of determining the optimal parameters of the wheel drive on the basis of the highest indicators of energy costs for movement and material consumption.

The Mathematics of Various Entertaining Subjects

2017 ◽  
Keyword(s):  
Graph Theory ◽  
Computer Games ◽  
History Of Mathematics ◽  
Modern Theory ◽  
Games Of Chance ◽  
Science Operations ◽  
Problems And Solutions ◽  
History Of ◽  
The Relationship ◽  
Topology Graph

The history of mathematics is filled with major breakthroughs resulting from solutions to recreational problems. Problems of interest to gamblers led to the modern theory of probability, for example, and surreal numbers were inspired by the game of Go. Yet even with such groundbreaking findings and a wealth of popular-level books, research in recreational mathematics has often been neglected. This book returns with a brand-new compilation of fascinating problems and solutions in recreational mathematics. It gathers together the top experts in recreational math and presents a compelling look at board games, card games, dice, toys, computer games, and much more. The book is divided into five parts: puzzles and brainteasers, geometry and topology, graph theory, games of chance, and computational complexity. Readers will discover what origami, roulette wheels, and even the game of Trouble can teach about math. Chapters contain new results, and include short expositions on the topic's background, providing a framework for understanding the relationship between serious mathematics and recreational games. Mathematical areas explored include combinatorics, logic, graph theory, linear algebra, geometry, topology, computer science, operations research, probability, game theory, and music theory.

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