Advanced Materials Research Vol. 739

Abstract: Among the rail defects, the transverse fatigue crack, which has been the most dangerous damage, is developed near the rail running face and grows perpendicular to the rail surface. Finally, the transverse fatigue crack would result in the failure of railway rail. In this paper, the rolling tests were performed using a JD-1 wheel/rail simulation facility without any lubricant. The tester is composed of a small wheel served as rail and a larger wheel served as wheel. The fatigue behavior of rail rollers with different materials and curve radius were investigated in detail by examining wear volume and wear scar using optical microscopy (OM) and scanning electronic microscopy (SEM). The results indicate that with curve radius decreasing, the wear volume of rail roller increases rapidly and the fatigue damage becomes severe. Furthermore, the cracking propagation angle increases obviously with curve radius decreasing and fatigue wear is dominating during the wear process. There appears distinct plastic deformation on the section of rail roller under small curve radius condition. For the same curve radius, the wear volume of PD3 rail is more than that of PG4 rail and the plastic deformation is more obvious. Moreover, the cracking propagation angle of PD3 rail material is smaller than that of PG4 rail. In conclusion, PG4 rail material is not suitable for the high-speed railway.

Abstract: Abstract: according to Hertz contact theory, the experimental study and micro-morphology analysis on the fatigue wear of 2 different kinds of wheel materials were conducted by using JD-1 wheel/rail simulation testing machine, to provide a basis for the selection of wheels used on high speed railway. The result shows that the degree of wear of the wheel steel mainly depended on the hardness, the two materials displayed a certain oxidation and stripping and their stripping morphologies were different obviously.

Abstract: The entity model of gearbox for construct machinery was created with Por/E. The entity model was imported into ANSYS with IGES. The displacements, strains and stresses of the upper cover and lower box were calculated with finite element method. The gearbox was optimized on structure and material according to the calculation results. The weight of gearbox was reduced 16kg. The calculation results show that the strength and stiffness of optimized gearbox change little.

Abstract: This paper presents the effect of Al₂O₃ nanoparticles additives on thermoelastohy-drodynamic with Newtonian lubricant. The modified Reynolds equation and energy equation have been formulated and solved numerically with initial conditions using multi-grid multi-level method. Simulation results show the operating with Al₂O₃ nanoparticles blended particularly with SAE-90 lubricant. The maximum pressure and temperature decreases, as compared to SAE-90 oil without nanoparticles additives.

Abstract: This paper analyzes the object vane motor and composite solar energy environmentally friendly cars , focusing on its air motor drive way , abstracted into five degrees of freedom vibration model vehicle , mathematical modeling , its stability and reliability analysis of research , and to optimize its speed and acceleration , and proved its stability and reliability of data through a lot of practice .

Abstract: The resultant effect of ice and snow accretion on automobiles in cold regions may induce performance losses by provoking mechanical system failures and structural damages. Different methods for ice/snow detection and measurement have been used by researchers, ranging from simple monitoring techniques to advanced complex ones. Thermal infrared image processing based techniques can be a promising way for ice and snow detection on different surface of automobiles in cold regions, but have not extensively been studied so far. This paper presents a preliminary study about application of thermal infrared image processing based techniques for ice and snow detection on various automobiles in cold regions. Preliminary field measurements have been carried out by researchers of Narvik University College in northern part of Norway during winter 2012-2013, where results have shown a potential in this technique. Better knowledge of vehicle performance in icy conditions will help the designers to improve safe driving conditions.

Abstract: The split-current magnetoresistor is proposed here. The structure likes the series magnetoresistor that one end split into two symmetrical terminals, so it is the magnetoresistor with three terminals. It uses the Hall effect current mode as magnetoresistor but the output is the differential current instead of resistance. It shows good linearity and can detect the magnetic field direction. The sensitivity in the differential current of width 100 μm and length 200 μm at 1 mA is 2.788x10^-6 A/T constantly while the conventional one in the differential resistance is varied with magnetic field. It is made of silicon non magnetic material so it is compatible with the modern low-voltage current-mode integrated circuit.

Abstract: This article designed a kind of crop environment remote monitoring system, it was configured with kingview 6.55, set the remote data acquisition, remote data transmission, remote control, automatic irrigation, pressure regulation, flow adjusting, overrun alarm, water pump automatic start-stop control for an integrated control system. The system realized monitoring, transmission, diagnosis, decision making and crop water dynamic management. And according to the information such as the water demand of crop growth to realize adaptive water-saving irrigation, the adaptive water-saving irrigation is realized to achieve a precise irrigation purpose. The system adopted B/S structure and the Web new edition function; the administrator can achieve the remote monitoring through the Internet which overcomes the restriction of time and location. At the same time, the crops field control level can select configure solar power as necessary which reduces the tedious work of electricity wiring, and achieves the purpose of energy conservation.

Abstract: In this paper, the fuzzy controlling system of automatic irrigation was prepared and designed based on MINI2440 and C8051F410 MCU, in which MATLAB was embedded in C8051F410 MCU while WINCE5.0 was embedded in MINI2440. In the progress, the WINCE5.0 was developed by using C#. All the simulate results of fuzzy controller were shown by SIMLINK in the system. In this paper, we proposed a novel control mode and gave the Robust Control Algorithm of the fuzzy Control System.

Abstract: The message transmission stability is very important for the design of the CAN bus system, which is related to the normal operation of the bus control system. The message transmission time is analyzed based on the Tindell scheduling theory, and the message transmission stability analysis is studied by means of probability analysis based on the second-moment method. An example in vehicle is calculated to get its message stability and the result is contrasted with the MONTE-CARLO method, and then the message transmission stability can be got using the method above; this will be the basis for calculating the stability of the CAN bus system, and provides the foundation for the further scheduling theory studies. It has great practical significe for CAN bus.