Applied Mechanics and Materials Vols. 121-126

Abstract: Used the theory of linear fracture mechanics and FEM, the two-dimensional model of single-tooth gear is established under the environment of ANSYS. The stress intensity factor(SIF) is analyzed when gear crack occurs and the variation of SIFs is discussed with changes of crack length, gear module, number of teeth, load when gear crack emerges at the pitch circle and tooth root respectively, and the influence of different cracked directions on tooth root is studied; The pragmatic expression of SIFs KI, KII have been brought forth with the results obtained by FEM. These establishes a good foundation on the fracture analysis and diagnosis of gear

Abstract: At present, USB Key is one of the security technologies which have been used very popularly in the Internet banking. This paper firstly introduces three levels of trade safety protection in the Internet banking, then introduces the basic principle and several important performance indicators of USB Key, and analyzes the challenge of USB Key has faced, finally puts forward some countermeasures.

Abstract: By weighing reliability, maintainability, availability and life-cycle cost of equipment which are influenced by testability，the testability indexes of system level BIT are determined on the basis of maximum system reliability & maintainability and minimum the life-circle cost. The influence mathematical models of system reliability, maintainability, availability and life-circle cost are established. According to these mathematical models, the multi-objective optimization model of system-level BIT testability indexes is established. The multi-objective optimization model is solved using Non-dominated Sorting Genetic Algorithm II, and the validity of the multi-objective optimization model is proved through an example.

Abstract: In the process of the equipments used, operational availability (Ao) is the common top-level parameter for the operational readiness. However, current Ao’s theories and methods toward support objects can mainly be applied to low levels which are lower than basical equipment combat unit, single equipment, but is inapplicable with higher levels such as equipment combat unit and materiel system. Firstly, the paper introduce the concept and usage mission model of the smallest mission unit(SMU). Then research the concept and calculate method of the SMU's operational availability. And research the status update model and simulation flow of accumulation workload time of the SMU in the Joint Operation Equipment Support Simulation and Evaluation System(JOESSES). And simulation calculate of the SMU's Ao. Finally , in the JOESSES ,the method which be created in this paper be proved to be credible and availability.

Abstract: This paper is oriented to typical operation missions, started with the concept and connotation of precise support, divided the precise support into three parts, including operational mission system, support target system and support system, systematically analyzed the mutual relationships among the subsystems, used operational readiness and mission sustainability these two parameters of integrated logistics support to make quantitative description, then discussed the running mode and process of precise equipment support.

Abstract: GT-Suite software is used to establish the simulation model of electronic fuel injection system for 16V280ZJ diesel engine. Combustion process simulation calculation is conducted to the direct injection (DI) diesel engine based on a main-post double injection scheme. Simulation parameters are modified based on the comparison with given experimental results. The calculation results effectively reflect the influence of fuel ratio and the interval angle between main and post injection over emission and fuel economy. Finally, in order to improve the engine emissions and reduce the pressure rise rate, we get the optimal injection solution for the main-post injection mode.

Abstract: The method to analysis the advantages of S Function and Auto-Disturbance-Rejection Control(ADRC)[1]. Basing on the MATLAB/SIMULINK as the simulation platform, three function blocks were constructed adopting the S Function and the subsystems’ encapsulation was realized as well according to the discrete algorithm of the Nonlinear State Error Feedback(NLSEF), the Tracking Differentiator(TD) and the Extended State Observer(ESO). By conducting the simulation example of the main steam temperature control system in a certain thermal power plant, the correctness and the effectiveness of the ADRC have been demonstrated.

Abstract: The two-way referral system comes into being in China with further development of community medical service. Based on investigation and survey of two-way referral system, the paper proposes the social security based two-way referral MIS, by way of the social security network linking the hospital and the community. Based on system feasibility, the paper makes functional structure overall design and function model design. The two-way referral MIS formulated in the paper can lower the two-way referral cost and help increase visiting rate and improve medical care in the community medical institution.

Abstract: MRI-compatible surgical robot technology is one of the most effective ways to improve the real-time image-guided surgical biopsy. In MRI environment, the robot design is facing the problems of high magnetic field and limited workspace. A pneumatic-driven MRI-guided intervention robot was designed for chest and abdomen surgical biopsy. Based on compatibility and workspace analysis, the specific structure design of the robot was carried out. Then robot coordinate system was established using D-H method and the kinematics analysis was conducted.

Abstract: In allusion to the status of the expression and integration technology of the three-dimensional CAPP processing information, a machining process information expression and integration method was put forward, which was process-oriented and based on the three-dimensional model of products. The machining process object was represented by the processing structure tree, and the processing information was expressed and collected in the three-dimensional situation. Finally，a prototype system was developed to illustrate the feasibility and validity of the proposed method.