Applied Mechanics and Materials Vols. 241-244

Abstract: This paper studies the structures of electric vehicle’s fast-swap battery box by modal analysis. With the software of HyperMesh and MSC.Nastran, the free mode and constrained mode of electric vehicle fast-swap battery box are analyzed. The result is given with modal parameter and vibration mode that depicts each mode. And then, this paper studies the acceleration of battery box with the frequency scanning analysis, and focuses on the distance between of mounting edge on inner box and the pins on outer box on the basis of frequency-scanning results under different frequencies. At Last, this paper analyses the vibration mode which leads to the offset, proposes the method of improving vibration mode of battery box. In the road test process of fast-swap battery box, the structure of battery box shows the best performance of vibration resistance.

Abstract: Using the method of Newtonian mechanics, the paper analyzes balance control problems of the self-balanced two wheeled cars, describes the detailed modeling process and simplifies it necessarily according to the needs of the control rate. It designs the full state feedback controller (LQR) and sliding-mode controller respectively, carries out the simulation and gets the ideal simulation curve. The comparisons of the simulation results show that the sliding-mode controller can get better performance than the full state feedback control in the control of the self-balanced two wheeled car.

Abstract: Dispersion characteristics for AC charging pile distribution and monitoring of electric vehicles in mobile state, it proposes a communication method with the server by centralized GPRS module and Electric Vehicle Terminal (EVT). In order to meet the design requirements of the comprehensive monitoring system for remote access, system uses Struts, Spring and Hibernate framework based on Browser/Server (B/S). Network servers use weblogic cluster together with the Oracle database server and Coherence real-time database to meet the high number of concurrent users. Client pages are based on the full-featured ExtJs library with beautiful interface. The system consists of five functional modules, which are structured and closed contact with each other. Test results show that the system is stable and the average response time is short.

Abstract: The smart power consumption is an important orientation in peak load shifting and load shedding of power grid in particular time period. It has the significant effect to relieve the load shortage of the power grid. The large-scale electrical devices like central air-condition in commercial building have the great potential in the energy efficiency improvement and available load integration. The effectively regulation of power load in public and commercial construction can improve the stability and reliability of power grid. The power situation in china and the content of empirical study were introduced, and the system hardware design and software platform construction is demonstrated. The function modules of software platform and realization of regulation system are discussed in final.

Abstract: In order to research the influence that the torsional stiffness and damping characteristic of the torsional damper had on the transmission rotational vibration, a multi-degrees-of-freedom model of torsional vibration of a transmission system of an FR type vehicle was built. The frequency of the torsional vibration model of transmission system was calculated, and the forced vibration in the transmission was analyzed; the sensitivity of the torsional stiffness and damping characteristic of the torsional damper on vibration response was researched. This method provides theoretical basis for solving the transmission system rotational vibration of the vehicle, and it has positive meaning in the development of the rear drivetrain NVH.

Abstract: In order to research the influence of lateral load transfer on the roll stability of passenger vehicle, the dynamics simulation model is established. Pass through simulation, the influence of the passenger vehicle structural parameters and speed on its roll stability is analyzed. The research result shows that, the passenger vehicle rear wheel drive axle is risky for roll stability; it will first lift off when the speed is too high or the front wheel angle is too big. The roll stability of passenger vehicle can be effectively improved by increasing the wheel spread and wheelbase, lowering sprung mass center height, and improving the passenger vehicle suspension roll stiffness.

Abstract: This paper designed an implement scheme of the alnic automatic measuring system for rail type vehicles. The system can read information of rail type vehicles by adopting four alnics, through the PLC to achieve the vehicles’s direction measuring and vehicles counting and axle counting and velocity measuring. In order to improve system reliability, comprehensive application of the anti-jamming alnic, software fault-tolerant variety of anti-jamming measure. By setting the calibration alnic, the system effectively overcome the interference of a variety of human factors. By cleverly setting registers N1N1N3 and in accordance with the principle of FIFO N1N2N3 pass assignment, software design is simplified. This system is widely used in modern logistics production and transportation management process of large and medium-sized enterprises involving the train transportation embedded in information management control system or warehouse management control system with high precision, stable and reliable performance, the low product cost.

Abstract: In traditional traffic signal coordination control, all intersections are shared a common cycle and have fixed offsets in one sub-area. The range of sub-area is normally fixed, plan switching is difficult, and the reaction to the traffic problem is slow. In this paper, a self-organized dynamic control strategy is proposed. it decomposes the network optimization into overlapped and interactive problems between Basic Coordination Units (BCU). It presents an interaction-forecast model among intersections, each intersection not only considers its own benefit, but also takes downstream intersections into account. Multi-scenarios simulation shows it works well in all saturation degrees, reduces total delay around 8% to 12.3%.

Abstract: This paper took the four-factor as decision variables: expense of section optimizing, opportunity cost of land occupation, transportation fees and networks efficiency, build model to optimize unimpeded issue of traffic networks, so as to resolve the problem of traffic networks layout and optimization in transportation channel.

Abstract: Contraposed to emergency medical service facilities location and scheduling problems in the earthquake disaster, we consider the seriously shortage of medical service supply capacity in the emergency rescue, propose the concept of the unit demand point of service supply index and set up a emergency rescue fairness model to minimize the difference between of unit demand point of service supply index and the ideal ratio of total supply and demand. At the same time, we build the emergency rescue timely model to minimize the distance between the each service facilities and the each covered demand point. Based on the idea of Pareto optimal, we design a advanced genetic algorithm to solve this multi-objective problem. A case study of Wen Chuan Earthquake shows that the model and algorithm are feasible and effective. This model can also provide the basis for emergency medical service facilities location decisions in the earthquake disaster.