This paper mainly studies to explore a three-dimensional geometric model including three modules of a sandcastle foundation with optimal stability. Firstly, based on the knowledge of streamline structure, structural mechanics, and fluid mechanics, the most stable sand pile foundation model under the action of tidal current and wave is established. Secondly, by limiting the degree of allowable aggregation, the discrete global optimization algorithm based on the continuous descent method is adopted to find out the optimal water-sand ratio. Finally, we apply the above results to verify the reliability of the optimal model by comprehensively considering the influence of rainfall factors on sandcastles.

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For biped robot, to control the moving stability is the key technology for the design. The biped robot has a human figure and several pose when moving. It is difficult to control its dynamic stability using the traditional method. This article gives a dynamic energy pyramid method, derives the characteristic parameter ----overturning stability index that maintain stable, and gives the method to calculate the overturning stability index. According to the overturning stability index, using the fuzzy neural network adaptive control system can change the configuration and velocity of the robot real time to assure its overturning stability. It will be easier to control the stable movement of the robot using the parameter. The action generated by the system has good practicability and high reliability, also can reduce the danger in the movement of the robot.

Aiming at the problem of judging the opening / closing time node by directly detecting the switch quantity in the process of detecting the mechanical characteristics of the switch cabinet, this paper puts forward a method to calculate the opening / closing time node with the CT secondary current as the original data. This method through the acquisition of CT secondary side current, current data of any phase, calculating threshold, intercepting alternative data, calculating slope and rate of change, the time node of opening and closing is obtained, solve many scenarios acquisition switch quantity and difficulties, judgement open/close time and the problem of low accuracy of switch performance. Through practical application, compared with the traditional acquisition of switch quantity to judge the opening / closing time node, the method proposed in this paper has universality, low detection difficulty and high judgment accuracy of opening / closing time node.