Based on B-spline wavelet on the interval （BSWI）, two classes of truncated conical shell elements were constructed to solve axisymmetric problems, i.e. BSWI thin truncated conical shell element and BSWI moderately thick truncated conical shell element with independent slopedeformation interpolation. In the construction of wavelet-based element, instead of traditional polynomial interpolation, the scaling functions of BSWI were employed to form the shape functions through the constructed elemental transformation matrix, and then construct BSWI element via the variational principle. Unlike the process of direct wavelets adding in the wavelet Galerkin method, the elemental displacement field represented by the coefficients of wavelets expansion was transformed into edges and internal modes via the constructed transformation matrix. BSWI element combines the accuracy of B-spline function approximation and various wavelet-based elements for structural analysis. Some static and dynamic numerical examples of conical shells were studied to demonstrate the present element with higher efficiency and precision than the traditional element.
介绍一种基于西门子ePS(electronic Production System)网络服务的大型数控机床状态监测和状态分析方法,它通过恒速轴测试、圆度测试和通用轴测试,能够实现对机床进给系统的传动部件故障溯源和伺服控制特性进行全面的评估;实验分析表明了ePS用于大型数控机床状态监测和故障诊断的有效性,从而为大型数控机床快速维护提供技术支撑。
