Advanced Materials Research Vols. 211-212

Abstract: With the aid of Monte-Carlo random sampling method, we establish the fault tree simulation model of the automobile braking function in losed,and set up the fault tree analysis simulation program SFTA,and work out the automobile mean time between failure (MTBF),failure probability and importance of bottom events.Moreover,by using the fault tree simulation program to analyze the reliability of the automobile system, we can not only settle the difficulty which the components contain nonexponent distribution, but also observe the contribution which each internal part makes impact on whole system reliability with the aid of the simulation running.This a great help to study the reliability of automobile braking system.

Abstract: With the increasing demand of woodiness furniture, wooden furniture packaging transportation becomes an important factor of keeping woodiness furniture quality stand. Generally, wooden furniture packaging including sealing, blowing, bagged, packing, pad, and labeling and so on. Reasonable woodiness furniture packaging design must consider these elements of packaging materials, packing size, tie-in of packages, convenient transportation and easily recycled.

Abstract: A new ring-type linear ultrasonic motor is proposed in this study. In this new design, bending vibration traveling wave is generated in a long ring by two groups of PZT ceramics bonded on the inner sides of the linear beams. Elliptical trajectory motions can be formed at particles on the teeth, which can realize the linear driving by frictional force. The working principle of the proposed design is introduced. Two bending vibration modes that have a phase difference of 90deg on space are analyzed. The elliptical motion trajectory of node on the tooth gained by the transient analysis verifies the excitation of bending traveling wave. A prototype motor is fabricated and measured, and a maximum speed of 15mm/s is reached.

Abstract: Exploiting resources in depth needs us knowing about properties of rock in depth. Triaxial environment test box with high temperature and high pressure is core device of equipment of testing properties of rock in depth. The main parameters are confirmed based on special environment of rock in 2000 meters depth in this article. Structural design and calculation of environment test box are completed according to engineering mechanics and machine design. By finite element structural analysis with Pro/E and ANSYS, we obtain contour of displacement and stress, results indicate that boot of bolt head takes place the maximum displacement and stress of upper cylinder body, and sharp angles of inside wall take place stress concentration. These will be theory references for design and manufacture of environment test box with high temperature and high pressure.

Abstract: The stability and accuracy of the drive mode are important for the performance of vibrating MEMS gyroscope. At present, the PI-like controller is always used in the control of the drive mode of vibrating MEMS gyroscope. The PI-like control has good effect on rejecting the literal disturbance, but it can’t reject the time-dependent disturbance well. The disturbance for the MEMS gyroscope is so uncertain that the stability and accuracy of the PI-like control for the gyro are comparatively low. In this paper, an ADRC method for vibrating MEMS gyroscope drive is introduced, and it is proved that this method can rapidly and stably control the MEMS gyro drive mode by simulation and comparing with the PI-like method.

Abstract: Based on theory and semi-empirical formula, this paper uses the method of reference enthalpy to calculate the surface aerodynamic heating flux of waverider with sharp leading edge. On this basis, applying ultra high temperature ceramic materials ZrB₂–SiC, thermal response of the sharp leading edge is studied. The results show that the aerodynamic heating can make thermal stress intensity extremum inside the structure exceed the ultimate strength of material quickly. Though the temperature inside the structure is much lower than material heat-resistant temperature extremes, thermal stress shock is able to cause material to damage in a very short time.

Abstract: This paper presents the chromatic aberration identification of touch panel (TP) decoration film by using nearly equivalent neural network (NN) model. This model is expected to adequately catch the complex relationship between the chromatic aberration and its possible influencing factors during the evaporation process of TP decoration film. Then, an intelligent estimator for the chromatic aberration of TP film could be developed automatically. Based on this estimator, the technician could set the control parameters of evaporation process in advance and make the quality of chromatic aberration of TP could meet the customer’s required.

Abstract: The optimal design of degradation experiments under the cost restraint is studied. The performance degradation process of products is defined with the degradation data distribution. Whether the total experiment cost exceeds the predetermined budget or not is set as the constraint condition, the objective is to minimize pth quantile variance of the degradation data, an optimal model for degradation experiment is established. A Monte Carlo simulation program is developed to obtain the optimal experiment scheme. An example of a metal crack degradation data is used to verify the efficiency of the method.

Abstract: In order to find out a new type of MR damper for block making machine, the signals of displacement in the vibration process during the test are collected and the time series AR model of trispectrum for analyzing the dynamic characteristics of the MR damper is built. It turns out that , in different working conditions, slices of trispectrum are applied to obtain the signal’s non-Gaussian, nonlinear amplitude-frequency characteristics which are very important for us to select the optimum working parameters of the MR damper.

Abstract: A main reason that leads to the complex dynamic behaviors of roller chain is the impact during engagement. In this paper, a contact analysis methodology is proposed to study the complex dynamic behaviors of roller chain efficiently. Considering the actual tooth profile, a detection algorithm of roller-sprocket contact was presented. Multi-body dynamics was used to analyze the contact kinematics relationships for purpose of simulating the impact between roller and sprocket precisely. Based on Hertz contact theory, a non-linear contact model of roller-sprocket is developed. Introducing the model to the numerical simulation of a roller chain system, the results validate the effectiveness of the model.