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1.
Explicit solution techniques have been widely used in geotechnical engineering for simulating the coupled hydro-mechanical (H-M) interaction of fluid flow and deformation induced by structures built above and under saturated ground, i.e. circular footing and deep tunnel. However, the technique is only conditionally stable and requires small time steps, portending its inefficiency for simulating large-scale H-M problems. To improve its efficiency, the unconditionally stable alternating direction explicit (ADE) scheme could be used to solve the flow problem. The standard ADE scheme, however, is only moderately accurate and is restricted to uniform grids and plane strain flow conditions. This paper aims to remove these drawbacks by developing a novel high-order ADE scheme capable of solving flow problems in non-uniform grids and under axisymmetric conditions. The new scheme is derived by performing a fourth-order finite difference (FD) approximation to the spatial derivatives of the axisymmetric fluid–diffusion equation in a non-uniform grid configuration. The implicit Crank-Nicolson technique is then applied to the resulting approximation, and the subsequent equation is split into two alternating direction sweeps, giving rise to a new axisymmetric ADE scheme. The pore pressure solutions from the new scheme are then sequentially coupled with an existing geomechanical simulator in the computer code fast Lagrangian analysis of continua (FLAC). This coupling procedure is called the sequentially-explicit coupling technique based on the fourth-order axisymmetric ADE scheme or SEA-4-AXI. Application of SEA-4-AXI for solving axisymmetric consolidation of a circular footing and of advancing tunnel in deep saturated ground shows that SEA-4-AXI reduces computer runtime up to 42%–50% that of FLAC's basic scheme without numerical instability. In addition, it produces high numerical accuracy of the H-M solutions with average percentage difference of only 0.5%–1.8%. 相似文献
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乔文俞 《郑州轻工业学院学报(自然科学版)》2009,24(2)
将ADE7757用于高性能电能表的设计,通过信号采集、功率测量、电能计算、输出驱动与显示等硬件设计,并结合频率编程、抗干扰措施,实现了电能表分时计量、分时计费等网络化电量管理模式.该电能表具有多功能、高性能、低成本等特点,有一定推广价值. 相似文献
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本文介绍了ADI公司的三相电能计量芯片ADE7758在电力计量系统中的应用,介绍了芯片ADE7758性能和工作原理,着重讨论了其设计使用中的注意事项和有关其校表的具体实现方法。 相似文献
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该监控器能够对电机的三相电压、三相电流和电能等进行测量,并通过RS485通信接口远传,还可以通过RS485通信接口对电机进行远程开关控制.本文对该控制器的硬件和软件作了详细的说明. 相似文献
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提出了一种新型的基于ADE7758芯片的配网测控终端的设计,给出了测控终端的硬件设计、软件设计及测控原理。在配电网中,各种电网参数对掌握配网的运行状况是至关重要的。当前对配网运行电气参数的测量数据普遍较少,不能满足配网运行分析的要求。应用电能计量专用芯片ADE7758设计配网测控终端,采集数据丰富,控制功能灵活、性价比高、工作稳定可靠,具有实用性。 相似文献
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