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Energetic parameter test on disc shear of plate and establishment of the best blade clearance mathematical model
MA Li-Feng, HUANG Qing-Xue, HUANG Zhi-Quan, CHU Zhi-Bing, HAN He-Yong
Chinese Journal of Engineering Design, 2012, 19(6): 434-439.
According to the problem of poor quality of plate of disc shear cutting and the larger deviation value obtained from shear stress theory, we carried out the production test, data acquisition and regression fitting. There is an error of -9.56%~+56.5% between the existing theoretical calculation results and measured results. The nonlinear changes of shear resistance and shearing area with the increasing of the film thickness were not considered in theoretical formulas, so the shear stress accuracy was substantially reduced. These theoretical formulas are suitable for thin plate calculation, however if these theoretical formulas are used in the thickness plate calculation of shearing force, there will need some further improvement. At the same time, this paper established a shear blade gap adjustment model which considering plate thickness, material properties, cumulative shear area of the disc, and also the cutter device in the shear deformation in the process of cutting clearance effect. Therefore, in view of the different disc shear equipment, the knife shaft load deformation value influence was considered in this model, to modify the model to be perfect, the clearance adjusting process parameters can be obtained.
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Electrical control and application of 3D motion system based on PLC
QIAO Dong-Kai, YANG Xiang-Yu, LI Duo-Min, LI Li-Bo
Chinese Journal of Engineering Design, 2012, 19(6): 465-468.
As for the phenomenon of lots of 3D motion control used in industrial productive process, this movement control adopt relay contact device control frequently, the method is low in stability and reliability, it will consume a lot of human and financial resources. So character of such movement was summed up, and the universal control goal of system was established. The method of 3D motion control based on PLC studied was suitable for all the 3D motion. In the specific application, this method can be used if only the parameters were changed. Good results were achieved when the design was used in 3D control of the movable hood filter.
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Research on onboard electronic system distributed architecture of civil aircraft
XU Ke-Hua, CHEN Mou, XU Yang, WU Qing-Xian
Chinese Journal of Engineering Design, 2012, 19(6): 494-498.
In order to solve the resource conflict and systematic coupling problem that the integration of onboard process system platform brings, the integration of mechanical and electronical system was promoted, distributed integration modular avionics system(DIMA) was used, the process modular was distributed near to signal source, the big cabinet of integrated avionics system was replaced using distributed small cabinet of DIMA, these small cabinets were connected using high speed data bus, the avionics full duplex switched ethernet(AFDX), timetrigger ethernet (TTE network) and ethernet passive optical network(EPON) were selectively analyzed in the application of DIMA system, and theirs technology characteristic were compared, its advantage and characteristic based on AIRBUS DIMA system were analyzed based on the architecture of DIMA. By using the architecture of DIMA, the resource conflict and systematic coupling problem can be resolved, at same time, the structure of back board of process cabinet can be simplified,can be widely used in civil aircraft.
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16 articles
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