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Research on Optimizing Distribution Route of Chain Convenience Store based on the Method of Saving Mileage
ZHU Chengjuan;LIU Lian;WANG Zhongchang;In order to improve the distribution efficiency of the chain convenience store warehousing center, reduce the distance in the distribution process, and obtain a higher cost advantage, the logistics distribution center of a chain supermarket in Taiyuan City distributes goods to ten community convenience stores with small demand for goods in the case study, the vehicle capacity limit is used as the constraint condition to design a set of reasonable distribution route plan using the mileage saving method in the heuristic algorithm. The results show that the distribution route scheme obtained by using the mileage saving algorithm has a shorter distance than the traditional distribution scheme, consumes less delivery time, and generates lower transportation costs. This research provides a new solution to the optimization of the distribution problem of supermarket logistics center.
Status and Development of RV Reduce
HE Weidong;SHAN Lijun;School of Mechanical Engineering,Dalian Jiaotong University;From the aspects of theory and experience,the status of RV development and the key technologies is reviewed,and the development in the future is presented. The theoretical research content of the RV reducer is summarized from tooth profile optimization,transmission accuracy,return difference,and torsional stiffness.It also make summing on the experimental research content of RV reducer on the aspects of processing technic and engine performances. Future work on the RV reducer is prospected.
A Model Development of Public Bicycle Rental Demand Based on Multinomial Logit
WU Yao1,CHEN Hong1,BAO Na2,FENG Wei1(1.School of Highway,Chang'an University,Xi′an 710064,China;2.Weifang Huayuan Highway Consultants Co.,Ltd,Weifang 261031,China)Based on a public bicycle travel method,the utility functions of different models were established,and the sharing ratio of public bicycles was calculated using a multinomial logit model.Combining the sharing ratio and the residents travel OD matrix,the public bicycle rental demand was obtained,and the total size of the public bicycle and the parking pile were determined by considering the bicycle turnovers.Take a new city area of Xi′an,the total number of public bicycles and the parking piles are forecast by the proposed model,which proves that the model is simple,efficient and feasible.
A Improved Genetic Algorithm for Vehicle Routing Problem with Fresh Food Delivery
CHEN Xinying;LI Yilin;XIAO Siyi;Adding the cold chain transportation cost to the mathematical model of the traditional vehicle routing problem, the fresh agricultural products distribution routing optimization problem is formed. Although fusion algorithm is adopted to solve the problem, but there are still problems such as poor solution quality, premature convergence. In order to solve these problems, an improved fireworks genetic algorithm IFWGA is proposed by combining genetic algorithm with fireworks algorithm. In order to compensate for the precocious convergence defect of genetic algorithm, the fireworks algorithm is implemented for the optimal and worst solutions of each generation of the genetic algorithm. At the same time, two step sizes of dynamic mutation operators are set in the algorithm in order to take into account the global search ability and local search ability. The mutation operators can be dynamically switched according to the number of iterations, so as to speed up the convergence speed and improve the search accuracy of the algorithm. The simulation results show that the IFWGA algorithm proposed in this paper has fast convergence speed, reasonable mutation operators and high solution quality.
Compensation Method and Experiment Study of CO Concentration Measurement based on MQ7 Sensor
LI Hua;JIANG Wei;LIU Xiaodong;FEI Jiyou;QU Chunlei;As the detection accuracy of CO gas concentration by semiconductor sensor MQ7 is influenced by environmental temperature and humidity change and H2 concentration, a compensation algorithm is proposed based on least square method. Using the algorithm after the changes of environmental temperature and humidity and the H2 concentration to process the measured data, the MQ7 measurements is not changed with the change of environmental temperature and humidity and the concentration of H2. Experiment verification shows that the algorithm can play a good compensation effect. The compensated measurement results are not interfered by the changes of environmental temperature, humidity and H2 concentration, and the compensated measurement accuracy reaches over 97%.
Optimization of Emergency Logistic Warehouse Location Based on Simulation Annealing Algorithm
ZHAO Zhen-ya,HE Guo-xian(School of Traffic and Transportation,Lanzhou Jiaotong University,Lanzhou 730070,China)Emergency warehouse location optimization problem of emergency logistic management was discussed in detail,and the importance and necessity of the emergency warehouse establishment was analyzed.In order to analyze accurately the influence of warehouse layout on the coverage ability and generalized time cost based on reasonable assumption,a bi-level programming model was constructed,considering the minimum generalized time cost of distribution process,and the minimum number of emergency warehouses covering the whole area to obtain the optimal solution by simulation annealing algorithm.The effectiveness of the model and algorithm is analyzed and verified to provide emergency storage location reference for disaster management decision-making departments in the disaster preparation phase.
A Method of Inverse Evaluation for Convection Heat Transfer Coefficient
ZHANG Yan-lei,TONG Wei(School of Mechanical Engineering,Dalian JiaoTong University,DaLian 116028,China)Generally,the convection heat transfer coefficient has many influence factors,therefore,it is hard to seek the answer in normal ways.In engineering application,numerical experimentation method is a time consuming process,and convection heat transfer coefficient is manually modified to bring the final computed boundary temperatures in accord with the measure temperatures.Based on the back analysis noconstraint,the optimization principle with theory a new method is proposed to solve the problem.
Ascertainment of Index Ievel and Coefficient Smooth
ZHANG De-nan,ZHANG Xin-yan (Dept. of Management, Dalian Railway Institute, Dalian 116028, China)This paper proposes three methods of index level and smooth coefficient deterruination which is important for the forecast accuracy, and can solve the problem of the application limitation of index level and coefficient smooth.
An Simulation Study of Single Inverted Pendulum Based on T-S Fuzzy Control Model
LI Guo-hui(School of Electronics and Information Engineering,Dalian Jiaotong University,Dalian 116028,China)State equations models is established to process steady control for non-linear unsteady system of single invert pendulum,which based on pole-placement and T-S fuzzy control model.The state-feedback controller and fuzzy controller were designed.Simulation and analysis were carried out to analyze control effects of the system by Simulink model.Results show that the models realize the steady control and solve the non-linear problem successfully with simple construction,well stability and fast-speed behaviors.Furthermore,an effective ways is proposed to control other non-linear unstable systems.
Study of Synthesis and Gas Absorption Properties of a Metal-Organic Framework MOF-5
SUN Hong,LIU Zhi-gang,CHEN Min(School of Environmental and Chemical Engineering,Dalian Jiaotong University,Dalian 116028,China)Metal organic framework materials(MOFs-5) were synthesized using N,N-dimethylformamide as solvent by hydrothermal method,and the hydrothermal reaction was carried out 130℃ for 4 hours.The optimal molar radio of Zn2+/ terephthalic acid is 2.7.SEM and XRD analysis results show that the MOF-5 exhibit a cubic crystal structure and the characteristics of MOF-5 peaks.The MOF-5 also exhibits excellent adsorption of N2,and the absorption rate can be controlled by O2.