Advanced Materials Research Vol. 381

Abstract: Due to good cooling and braking performance, it is widely used for disc brake in automotive industry. The numerical analysis of stress and strain field for automobile disc brake is done by using ANSYS finite element platform in this paper, the relationship of design parameters and braking performance is obtained by changing design parameters of the brake (braking force, friction coefficient, brake pad thickness).At the same time the modal of automobile disc brake is analyzed, which the results provide a theoretical basis and reference for the automotive brake designer.

Abstract: There are parametric uncertainties, nonlinearities including the hysteresis effect, and other un-modeled disturbances existing in piezoelectric actuator systems. A terminal sliding mode control methodology is proposed in this paper. By using nonlinear TSM manifold, the system errors can converge to zero in finite time. So high-precision tracking performance can be achieved. Simulation results are presented to validate the design.

Abstract: Taking some type of steelmaking electric arc furnace for example, this paper, by using 3DS MAX, conducts a dynamic simulation of such industrial furnaces based on 3D modeling of SolidWorks and realizes the virtual, dynamic and interactive demonstration of industrial furnaces combining with the virtual reality technology of WebMax.

Abstract: Diamond coatings were prepared on mono-crystalline silicon by hot filament chemical vapor deposition (HFCVD). Hardness, elastic modulus and other mechanical properties of the diamond were analyzed by nanoindenter. The results showed that the process parameters such as chamber pressure, substrate temperature, methane volume ratio have a greater impact on the mechanical properties of the diamond coating. The micro-hardness and elastic modulus of the coating would both decrease with too high or too low substrate temperature, chamber pressure or volume ratio of methane. The results showed that when the substrate temperature is 750°C, champer pressure is 2.5kPa and methane volume ratio is 2%, the diamond coatings have high micro-hardness and elastic modulus.

Abstract: Transmission line intelligent distribution and management system is the latest systematic product for optical network intelligent distribution, with the function of detecting, warning and information processing, whose purpose is to realize the delicacy management of transmission line resources and solve the problems appearing in the process of using resource management system., such as input complexity, function singleness and so on. The thesis introduces different functions of each module in this system, puts forward the solutions to this systematic function and provides some realization codes.

Abstract: VW-1-011 type ball and cage universal joint is applied widely in automobile, which performance directly affects the safety of car driving. It is important significance to research the performance of cage-type universal joint as its force complex. The diversity important position of ball and cage is analyzed by FEA ALGOR software in paper, and the distribution of stress or strain is obtained, which the results provide a theoretical basis and reference for the designer of Cage-type universal joint.

Abstract: Several international deep space exploration plans aimed at Mars landing and surface sample returning. Because of the communication delay between Earth and Mars and the lack of information on the Mars complicated surface, autonomous landing at selected location is required. Based on multi-point laser rangefinder and optical navigation camera, the relative position and attitude rapid determination algorithm is present in order to ensure precise and safe landing. To get the normal direction of the landing plane and the target point position, the geometry relation of laser measure vectors and target point are used. Finally, performance of the autonomous relative position and attitude determination system is verified using the numerical simulation. The results show that the proposed methods can achieve accurate position and attitude determination.

Abstract: A three axis CNC milling machine was used for the cutting tests on the inclined surface of the 53HRC hardened steel, the hardened steel surface for the tests were keeping a inclined angle about 200 with the horizontal plane. According to the analysis of three axial milling force in the different milling strategies and different milling parameters, the effect of the different spindle speed and milling strategies for the cutting force was studied while the ball end finishing milling the hardened surface. The results of the tests were the good reaction for the rule of the cutting force which was changing with the spindle speed n and milling strategies, in addition, the results gave the reference of selecting optimum milling parameters of ball end finishing milling.

Abstract: Accurate determination of flow stress and friction factor is the guarantee of accuracy for finite element analysis of metal extrusion. Firstly, flow stress equation parameters for materials test were initially decided in order to perform finite element analogy. Then, the simulation values and experiment values were compared and the iterative optimization algorithm was used to amend the parameters. The objective was that value error of simulation and experiment values was controlled within tolerance. Finally, accurate flow stress and friction factor were determined. In rod-rod composite extrusion experiment of pure lead,it is determined by inverse analysis that the material strength coefficient is 11.9, strain hardening exponent is 0.127,and friction factor is 0.18. The comparison of the load-stroke curve between simulation and experiment and pure lead upsetting test contribute to confirm that the measured data is accurate. The results show that inverse analysis is a precise, simple and practical method for measuring flow stress and friction factor.