Advanced Materials Research Vols. 850-851

Abstract: The paper makes a deep analysis of the series constant current remote power feeding system which is used in seafloor observatory network. The reliability design and allocation scheme used to minimize the total cost of the system in certain condition is accomplished, and the nodes power feeding reliabilities are calculated. The analysis shows that series system can provide a reference solution for seafloor observatory network construction in our country.

Abstract: In order to obtain excellent cooling module, it is necessary to make air flow flowing into the radiator vary with ambient temperature. Cooling fan speed must vary with cooling power continuously. In this paper, the relation was obtained between fan speed and flow, static pressure, torque, power based on calculation and performance test data related to cooling fan. The mathematical model between fan speed and heat dissipation power in cooling module was deduced. Driving characteristics of cooling fan were analyzed.

Abstract: This paper describes the use of Fluid Flow Simulation Software to model a passenger aircraft engine environmental control system. The analysis simulates the cooling pack and the engine distribution system in a single model.The engine environmental system is very important for engine working efficiently. Using AMEsim software to simulate the cooling system can make it easily and clearly. The influence of the heat component and the fan operating is studied also. Through the analysis of the cooling system, we know that with the help of fan, the system can get additional air in the radiator and make the temperature decrease consequently.

Abstract: In this research, a virtual cab package model had been established in CATIA which was used for driving posture prediction in RAMSIS. 40 cab package schemes and the corresponding driving postures could be acquired by adjusting the parameters of the steering wheel, the clutch pedal and the seat. The quantitative analysis between cab package parameters and driving posture was researched using regression method. And the regression functions that clearly express the relationship between them were concluded, which could be used for directing the design and optimization of the cab package schemes.

Abstract: For integral steering geometry, its spatial structure rationally is simplified. Based on it, mathematical model of integral front steering geometry that is similar with the reality of elastic tires is built. For ensuring design variables, the target function model is established by the inner wheel steering angle of rotation absolute error and binomial weight function. And the problem is optimized using the Genetic Algorithm in MATLAB. Finally, optimization algorithm is verified by a real example of optimization of econopower car.

Abstract: For the comparative analysis of composite blast walls on the protective effects of blast wave, Overpressure protective effectiveness coefficient was put forward to analyze protective effectiveness and . It was studied that Protective effectiveness of composite blast walls under blast waves using 3D numerical simulation method and analysis of the amount of drugs, explosive distance, height and other structural parameters on protective effect of composite structures. The influence of several factors on forecasting formula was analyzed, such as scaled blast distance and scaled height of wall. Via fitting the simulation results overpressure formula of the back of composite blast walls was obtained. The result indicate that protective effectiveness of composite structure increases when walls height increases or scaled blast distance decreases.

Abstract: The key components of planter was the cell wheel, its performance directly affected the quality of the seed. Seed-drille appliance used when faced with a sliding clearance kinds of seed material damage, as well as from the end of seeding mouth kind Gully large distance seeds during seed cast seed tube wall by conduction caused by obstruction seeds bounce in the ditch, affecting the spacing and reduce spacing pass rate and other issues. For the above agronomic requirements, the process of drilling was researched, and the cell wheel of seed-drille appliance was designed legitimately. The diameter of the seed-drille appliance and the hole type of the cell wheel and the number of the hole was calculated.

Abstract: This machine was for membrane covering the whole of the double furrow sowing technology and designed. They were designed to meet membrane covering the whole of the double furrow sowing technology agronomic requirements of the premise, but also to meet planting can improve efficiency, stable, reliable and cost requirements. For the above requirements, the machine used double Dibble wheel structure; field test results show that the aircraft meet the design requirements and agronomic requirements.

Abstract: This paper discussed the mechanism of dilatancy in coarse grained soils. Large-scale triaxial tests were also conducted to study the dilatancy law of coarse grained soils. Based on the results of the previous studies, it is found that plastic potential function proposed by Lade can fit the test results well. Lades dilatancy rule was then applied to a practical two-yield-surface model. Elastoplastic formula of the two-yield-surface model was also deduced in detail. The new model was verified with several groups of different materials. Results showed that this model could predict the behaviors of coarse grained soils well.

Abstract: Based on the Virtual. Lab software, this paper used multi-rigid body dynamics and soft multi-body dynamics theory as the foundation to establish the satellite coupled virtual prototype model including rotary table, rotating arm and the antenna. The simulation model is used to analyze the influence of the flexible rotary arm body on the satellite and obtain the rotating arm stress and deformation under the coupled conditions, which provides theory basis for the satellite design, the material selection of satellite rotary arm and other key component, and strength check under coupling dynamic load conditions. At the same time, this provides data support for the fatigue reliability research of future satellite key component.