In this paper, the study object is a vibrating screen driven by two motors. A new analytical method is proposed to study the dynamic feature of the screen. With introduction of two small variable parameters to average angular velocity of two exciters and their phase difference, the parameters of the model were dimensionless processed, and then the synchronization condition and stability condition of the vibrating screen were deduced. Computer simulation results based on synchronization condition and stability condition show that the vibrating screen realizes speed synchronization and phase synchronization, the system is in a good self-synchronous state.
Finite element method is widely used in steam turbine impeller blade subsystem strength analysis aspect, but because of the complicated working environment, the steam turbine has taken different handling of loads and boundary conditions when using finite element analysis method. In this paper, Static strength of the "215mm" of 135 MW steam turbine standard blade was calculated by using traditional calculation method and finite element method. By comparing two kinds of analysis results, the work load and boundary conditions were revised, which ensured the credibility of the result of the finite element analysis; According to the analysis results of stress, concentration phenomenon was obvious, then the blade root was optimized and the optimization result was excellent.
Due to the unique geographic location and natural environment, island energy supply seems complicated. But the stored oceanic energy around island makes important practical significance to maintain island energy sustainable usage. This paper explored main oceanic energy category, its distribution and reserves based on the status of oceanic energy usage, and also summarized the three main factors which restrict island oceanic energy usage-technique and cost, ecological environment and national planning. Then, the paper gives suggestion on island oceanic energy development and forecasts the future of island oceanic energy usage.
For the problem of multi-task assignment based on the contract net protocol, this paper improved the traditional contract net protocol after analyzing its defects ,such as broad bidding scope and low efficiency etc. The research proposed a method of screening the bidders for each task by using distance matrix in task distribution ,employed the 0-1 programming model established to determine the successful bidders for each task in bidding process. Meanwhile, the study applied the auction mechanism to realize the dynamic assignment of multi-task, provided a concrete model algorithm and analyzed the performances of the algorithm proposed as well. The results show that the model algorithm effectively improves the overall performances of the task assignment system.
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