Applied Mechanics and Materials Vols. 313-314

Abstract: MEMS (Micro Electro Mechanical System) are usually defined as highly miniaturized devices combining both electrical and mechanical components that are fabricated using integrated circuit batch processing techniques. Pressure sensors are usually manufactured using square or circular diaphragms of constant thickness in the order of few microns. In this work, a comparison between circular diaphragm and square diaphragm indicates that square diaphragm has better perspectives. A new method for designing diaphragm of the Piezoresistive pressure sensor for linearity over a wide pressure range (approximately double) is designed, simulated and compared with existing single diaphragm design with respect to diaphragm deflection and sensor output voltage.

Abstract: Thin-walled workpieces have the characteristics to withstand a greater load with less material and they are used in aerospace field widely. SiC_p/Al composite has high strength and stiffness, which meets the requirements of the aerospace workpieces well. The optimization method is studied with grinding stability and material removal rate as constraint conditions in this paper. The processing parameters optimization of a SiCp/Al thin-walled cylinder is analyzed according to stability lobe diagram. The grinding parameters optimization could be achieved by this method and the chatter could be prevented effectively.

Abstract: Shape has a significant impact on the good quality of follow-up deep-processed steel products. But it is difficult to detect, so a shape detecting equipment of cold rolling strip is developed to meet industrial application, which mainly consist of the shape detecting roller, the collecting ring, the DSP shape signal processing board and the shape control model. The shape detecting system was successfully used in 1250 mm HC 6-high reversible cold rolling mill. The precision of shape detecting is 0.2 I.

Abstract: In this paper, elasto-plastic dynamic response analyses of 300m span arch trusss structure model are carried out under the condition of earthquake by using SAP2000. The geometric and material nonlinear effects are considered. Based on the plastic-hinge theory, by gradually increasing the peak acceleration of earthquake, the structures dynamic elasto-plastic analysis have been done with Ninghe wave under the initial condition that the arch trusss stress and strain are caused by constant load and snow. According to simulation results, the critical peak acceleration is obtained when the steel framework lose stability, which can judge the anti-seismic capacity of the structure.

Abstract: To solve the tool flow and part flow interaction problems in job-shop scheduling, a kind of dynamic scheduling technology in job shop with tool flow is proposed. A new method of decision point calculation and a new heuristic approach for job selection named tools-minimally-occupied (TMO) are proposed. According to the method and the rule, the problems of when and how to select the parts in the dynamic scheduling are solved. The technology is proved to be effective by examples.

Abstract: In order to realize precise management and improve quality of construction machinery, a manufacturing process management system of large sized structure components was designed and applied. Firstly manufacturing process of large sized structure components in construction machinery was analyzed. Secondly manufacturing resources of large sized structure components was analyzed. Thirdly the architecture, function structure and database were designed. Then the application steps of the system were discussed. Feasibility and effectiveness of the system were verified by a case of enterprise application.

Abstract: Cold rolled dual phase steel was developed from Q345 steel by heat treatment procedure for automotive applications. The ultimate tensile strength was improved about 100MPa higher than the traditional cold-rolled Q345 steel in the continuous annealing simulation experiment. The microstructure presented varied characteristics in different intercritical annealing temperatures; mechanical properties were changed correspondingly as well. The chief discussions are focus on the recrystallization, hardenability of austenite and martensite transformation in the experiment.

Abstract: Physics-of-Failure (PoF) represents one approach to reliability assessment based on modeling and simulation that relies on understanding the physical processes contributing to the appearance of the critical failures. Firstly the connotation and meaning of PoF method were analyzed here, the inherence relation between PoF and reliability was expatiated, the PoF based reliability method and current reliability method based on probability statistics were compared, their differences and relationships were discussed here. Then the application condition of PoF method in reliability engineering in European and American developed country and China were summarized, the PoF based reliability engineering technologies were introduced systemically from several aspects, such as reliability design and analysis, reliability test and validation, maintain and support. Finally, combining with the developing characteristics of military materiel during the new period, some future investigation directions and application foregrounds were prospected.

Abstract: For getting the effectiveof application in dissipation dust law with particle motion equation atcoal handling system of belt machine tail, must be to proceed related numerical simulation in the way of dust particles motion incoal handling system of belt machine tail and dust concentration of diffusion inoperation space. Application particlemotion equation theory for numerical simulation to coal dustparticles, obtained dust coal dissipation law in coal handling system, at thesame time combine with the data of the field test of dust concentration andfallout dispersion for analyzing and comparing. The results of comparison showthat: the data of numerical simulation with particle motion equationin coal dust dissipation law is coincide with reality dissipation law. Accordingto the conclusion of this research, it is provides theoretical basis forprevention and treatment in coal mine of coal handling system of dustdissipation.

Abstract: Amodel between measuring error of component power flow in pipes and mountingdeviation is developed.The proposed model shows that the component power flow is more prone to influenced by positiondeviation, and 5% deviation might result in 10% measuring error. Moreover,contrary to the total power flow, the error of the component power flow is alsorelated to choice of grid origin and amplitude ratio of two component waves.