Applied Mechanics and Materials Vols. 401-403

Abstract: Large antenna is susceptible to external influence in the actual work load; it causes the azimuth change and affects the radar work. In order to solve this problem, Adams and Simulink co-simulation method and the antenna board PID control are used. Simulation results show that angular variation of the callback can be achieved, and the response time can be greatly reduced less than 2 seconds. Keywords: Panel Antenna, Co-simulation, Azimuth control

Abstract: This study has finished the crankshaft fatigue strength test by the rational experimental method. And based on the experimental data, the statistical regression analysis of eight commonly used hypothesis distributions, namely Weibull (two-and three-parameter), normal, lognormal, extreme minimum value, extreme maximum value, and exponential (one-and two-parameter), are developed. Then the degree of fitting effect between the experimental data with the eight statistical distributions is evaluated. The result shows that six kinds of statistical distributions, including Weibull (two-and three-parameter), normal, lognormal, extreme minimum value, extreme maximum value, have good fitting effect. In all distributions, the best one is three-parameter Weibull distribution.

Abstract: Considering of the hypothesis of small deformation, the deflection approximate differential equation of beam and integration equation theory and numerical methods are used to the deflection problems of the double composite cantilever beam. The deflection problem of the double composite beam with smooth interface under a point vertical force acting on the beam end are analyzed concretely, the analytical solutions of the touching distributing force and the cross section rotation angle function are given, and the concrete method of computing the beam deflection is put forward based on the Gauss-Legendre integration formula, the results of the given example show the validity. The methods and the conclusions here can be extended to study the deflection problems of composite cantilever beam with arbitrary layers and the deflection problems of composite beams with other supporting condition, they are important to the designs of the engineering beams.

Abstract: The advantages and development of the 42V automobile power system are summarized and the operation mode is analyzed. The 42V brushless alternator is designed which is the key part of the system. The excitation rotor and armature winding are redesigned to satisfy the 42V system and increase the efficiency.

Abstract: In this paper, for the self-mobile stage vehicle design principles, designed a machine to automate the entire flow of the main stage, high-performance cars. Focus on the mobile stage vehicle "design professional, operational safety, performance adaptation, the use of durability, the conservation of economic and quality of services" and other challenges make it more safe and practical, to make up for the traditional mobile stage vehicle inadequate design. The self-propelled mobile stage vehicle with a compact, easy to operate, easy to open and close, easy to perform, etc., is a collection security, high-performance multi-purpose arena in one car.

Abstract: The structure designing and working principle simulating of a multi-locomotion mode spherical robot which has two basic movement patterns-globule mode and three-wheel mode is proposed in this paper. When the two hemispherical shells are closed, the robot is in a globule mode, which is easy to carry, throw and achieve all directional movements on the ground. When faced with sand and slope, it can expand to a three-wheel mode, and enhance the ability to adapt to the environment. Three-dimensional technology is used for building a virtual prototype of the spherical robot, as well as the motion simulation of the spherical robot. Compared with the traditional designing and analyzing methods, the way based on three-dimensional technology is more economical, more convenient and faster.

Abstract: In order to detect the shifter module quickly and easily, a method is proposed that detect the shifter module using the solar. First, proposed two evaluation parameters; then the antenna receives signals from the solar radiation, compare the receiving power of each receive channel, that can get the two evaluation parameters, those two parameters shows the performance of each phase shifter module; Finally, verify the effectiveness of the method by a simulation experiment.

Abstract: In this paper, a rigid spindle supported by two identical water-lubricated journal bearings is proposed. The dynamic equations of motion are presented to predicate the performance of the spindle. Under the assumption of linearity, the responses of the rotor excited by constant external force and unbalance force are comprehensively discussed by the fourth Runge-Kutta method. To analyze the static and dynamic characteristics of the water-lubricated bearings, the bulk flow turbulent theory is used and numerically solved by finite difference method. Results of this investigation contribute a better understanding of the performance of a water-lubricated bearing-rotor system.

Abstract: The vibrating roller crusher make relative vibration generated by two rigid bodies to bring high-frequency impulse. The force impact on grain layer (or granular) in chamber, which makes grain crush. Based on the newton's law, the vibration differential equations and dynamics model in vibration-impact crushing system of a unilateral single-mass are established. By dynamic analysis, amplitude frequency curve, hysteresis impact curve and energy absorption curve are all found. On the numerical values, principal resonance of system on forced oscillation is solved. Displacement, velocity and acceleration with the time history are induced. The results showed that the movement of a mass is not simple harmonic motion. From clearance and vibration frequency, influence laws on amplitude frequency, impact, energy absorption is also established.

Abstract: An automotive drive shaft is used in a front drive transmission vehicle for transmitting rotary movement from the gearbox output shaft to the wheels with a constant velocity. The kinematics model of ball joint and tripod joint has been studied without consideration of clearance. This paper will propose a new model with consideration of the clearances on ball joint and tripod joint. The simulation results are given by using this model. The conclusions are made as well as the future work.