This chapter introduces the Esys − Particle, the open source code of Discrete Element Method (DEM), and its evolution history and basic features of the model. We outline the recent developments of the Esys − Particle code, including incorporation of single particle rotation, new contact law, and parameter calibration, parallel algorithm, coupling of thermal and hydrodynamic effects. We discuss the major differences between our model and most current DEMs. Some numerical simulations of rock fracture, earthquake process, fault evolution, hydrothermal effect coupling and a full solid-fluid coupling are presented in this chapter.
Piezoresistive micro-mechanical acceleration sensor is one of the earliest developed silicon micro-mechanical acceleration sensors in MEMS. Its cantilever beam is the main component. So the structure optimization design of the cantilever beam becomes the key. During the process of the former structure optimization of the cantilever beam, the working way between the program of FEM analysis and the optimizes belong to a kind of series connection ,so we must design interface program in order to realize the data transmit between FEM and optimize program. This paper tries to replace FEM with neural network and carries on structure analysis on the cantilever beam in the piezoresistive sensor, FEM can be interpreted as a kind of relation of connecting with the program of optimizing in parallel, once after training the essential sample of network with FEM acquisition, the FEM program has no relations with the optimizing program. The next work is to train the network, put the well-trained network to the optimizing program and put into operation. Obtaining the FEM training samples, training the network, structure optimization are separated and interrelated. The whole procedure is very succinct.
For lack of structure rigidity foundation and radial force diminishing exponentially with the distance of gland, a newly packing sealing structure with opening and hollow metal ring supporting is designed. Through finite element analysis, it comes out that the disadvantages are divided adding effect of high pressure resistant. The radial force is increased,preload is reduced, and the mechanical seals can be replaced under certain condition.
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