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Firstly, the wear between the lock ring and hook of a retractable undercarriagedoor lock machine under the action of the periodic load has been discussed. Secondly, the calculations based on the Acrhard model has been established to confirm the incremental wear gap in a given time. Thirdly, the analysis and calculation model of the wear reliability were given when the size parameters, load, material...
Software development is a high-risk activities in the project development process. Any stage may be at risk. Risk occurred in the project is a series of events or the possibility of adverse results. To take active risk management approach can process more smoothly the project can get very high ability to track and control project, you can avoid, transfer risk, or mitigate the risk of adverse effects,...
It is important for a cucumber project to improve the germinating rate and reduce the plant disease in seeding stage. According to the experimental data, a grey theory model, the GM (1, 1) model, is established to predicate germinating rate. The grey differential equation, albino equation, the time response function are constructed and the maximum ratio of medicine-germination rate is calculated using...
The ultrasonic motor (USM) is a popular actuator and used in industry and academic research in the last decades because it has the advantages of high holding torque, good response characteristics, high torque density, silent operation, free of electromagnetic noise and compact size. However, the motor are time-varying and highly nonlinear system which the parameters varied with increasing temperature...
Close chain of spatial mechanical structure of the hydraulically driven Stewart platform makes there exist coupling between the six degrees of freedom. In this paper, it builds the multi-body dynamics model of system with Kane method and then builds the dynamics model of the hydraulic servo system. Combining the two parts, it achieved the whole dynamics model of Stewart platform. By studying the coupling...
Although it is an old method, the use of Greenpsilas function to solve unsteady flow in reservoir engineering is not widely practiced. The reasons are that it is difficult to find the appropriate Greenpsilas function and evaluating performance of perforation completion of horizontal well is more sophisticated than conventional completion. In this study, the flow in formation after being perforated...
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