Advanced Materials Research Vols. 1061-1062

Abstract: In view of a certain type of electrical equipment whose failure causes and failure is not a one-to-one relationship between signs, this paper established the mathematical model of fault diagnosis adopting the fuzzy reasoning mechanism. At the same time, we designed the system overall scheme of fault diagnosis according to the system of the diagnosis process and realized diagnosis function of system by using vc + + programming language. Through specific examples verify that the system has the ability of fault diagnosis of electric equipment for a certain type.

Abstract: Effective implementation of BDAR(Battlefield Damage Assessment and Repair) can compensate equipment for battlefield losses, maintain combat effectiveness at the meantime. Under the conditions of modern information warfare, a variety of advanced reconnaissance, detection methods and widely used precision strike weapons, are making the battlefield highly transparent, however,the living environment of weaponry will become very seriously, more brutal battlefield injuries of weaponry will come up simultaneously. Equipment battlefield damage repair is facing new challenges,therefore,the BDAR military equipment which can maintain and enhance the combat capability has great practical significance under conditions of informationalization.

Abstract: Running shoes affect athletes’ sprint speed to a great extent, and running shoes made of different materials show different performance. Sprint is a highly explosive sport with great explosive power and great stress on feet, and thus shoes have great impacts on sprint. Based on main materials of current running shoes, this paper discusses about the influence of running shoes made of different materials on athletes’ sprint speed in terms of spike, sole and vamp etc. by athletes’ self-comparison experiment. Results show that athletes will run faster with greater spike friction, better damping effects of sole and better vamp breathability under the same conditions.

Abstract: Construction workers are vulnerable to heat stress, and a number of heat-related injuries and deaths have been reported. This study thus introduces a phase change material (PCM) based cooling garment designed for construction workers. The PCM cooling garment will be effective in reducing the workers body temperature and can extend their maximum tolerable time on sites.

Abstract: An adjustable inertia balance support is proposed to counterbalance the inertial force from the actuators for high performance scanning probe microscope. The adjusting method is based on voltage proportion control. In contrast with traditional method that adding or removing mass, it is very convenient to adjust to minimize the inertial force transmitted to the supporting base. It may have a promising application on the current inertia balance support structure, which is used in some high-speed scanning probe microscope. What is more, it has a very good compatibility with current structure.

Abstract: The dynamic characteristics researches of the bridge crane hoisting mechanism were summarized. Four-freedom-degree elasticity vibration model was established according to actual working condition of bridge crane hoisting mechanism. It considered the impact of the input torque, the stiffness of wire rope and so on. The paper applied to the state-space method to solve the numerical value and simulation based on the Matlab/Simulink software. It contained the hoisting displacement and speed curve, and the bridge structure volatility curve. The simulation results show that the correctness of the model, which lay the theoretical basis for all kinds of hoisting mechanism dynamic characteristics research in dynamic problems

Abstract: Based on comprehensive considerations the influences of stiffness excitation, deviation excitation, meshing impact excitation, friction of tooth surface, and other kinds of nonlinear factors, it established a nonlinear coupled vibration model of bending-torsion-axial-swing coupled helical gear transmission system by applying the Lumped Mass Method. After transformed the model to dimensionless form, it used Runge-Kutta method to solve the nonlinear vibration model of the system, and then the time domain chart, spectrum chart, phase chart, Poincare chart, and FFT chart were obtained; it discussed the influence of system parameters on its dynamic characteristics.

Abstract: For socked and non-socketed piles in the different mechanical behavior under static and dynamic loads, the paper use ABAQUS to model, simulate the pile , the soil interlayer thickness between the bottom of the pile and bedrock are 2m, 4m under vertical load and Earthquake, cushion cap, pile and pile soil stress situation found non-socketed piles when the soil interlayer thickness within a certain range, the composite pile small subside under dynamic, static loads, the non-socketed piles can better take advantage of the pile soil has a good seismic performance in the earthquake.

Abstract: The problem of forecasting the durability of structures, buildings and constructions is one of the most urgent and important tasks in building sphere. In this paper, the authors propose a mathematical model of damage accumulation for the numerical simulation of the fatigue life of concrete. The results of numerical experiments with different levels of the applied load to the model are given, the fatigue characteristics of concrete material - Wohler curve - is built. On the basis of the developed method, the algorithm for research building designs using mathematical and physical modeling is formulated.

Abstract: This paper aims to develop a new systematic analysis model to predict the contact angle of ball screw in high-speed condition. In order to investigate the contact angle between the ball and raceway, a proper mechanics model of ball screw should be established. Then, considering the influence of centrifugal force at high speed, the change of contact angle will be analyzed and solved. Finally, the different factors on the influence of contact angle in different locations are analyzed. This study provides the theory basis of studying kinematics of ball screw in high speed.