In the development of the basic stress equations for tension, compression, bending, and torsion, it was assumed that no geometric irregularities occurred in the member under consideration. But it is quite difficult to design a machine without permitting some changes in the cross sections of the members. Rotating shafts must have shoulders designed on them so that the bearings can be properly seated and so that they will take thrust loads; and the shafts must have key slots machined into them for securing pulleys and gears. A bolt has a head on one end and screw threads on the other end, both of which account for abrupt changes in the cross section. Other parts require holes, oil grooves, and notches of various kinds. Any discontinuity in a machine part alters the stress distribution in the neighborhood of the discontinuity so that the elementary stress equations no longer describe the state of stress in the part at these locations. Such discontinuities are called stress raisers, and the regions in which they occur are called areas of stress concentration. Stress concentrations can also arise from some irregularity not inherent in the member, such as tool marks, holes, notches, grooves, or threads. 1 in T 18 in Figure 3–28 The cross-section of a thin strip of steel subjected to a torsional moment T. bud29281_ch03_071-146.qxd 11/24/09 3:02PM Page 110 ntt 203:MHDQ196:bud29281:0073529281:bud29281_pagefiles: Load and Stress Analysis 111 A theoretical, or geometric, stress-concentration factor Kt or Kts is used to relate the actual maximum stress at the discontinuity to the nominal stress. The factors are defined by the equations K t = σ max σ0 K ts = τ max τ0 (3–48) where Kt is used for normal stresses and Kts for shear stresses. The nominal stress σ0 or τ0 is the stress calculated by using the elementary stress equations and the net area, or net cross section. Sometimes the gross cross section is used instead, and so it is always wise to double check the source of Kt or

机械设计形位公差分析GD&T英文原版，为机械设计师提供的

IEC 60749-1_44 Semiconductor devices – Mechanical and climatic test methods -包含全部45份最新英文版标准文件.7z

Auto CAD Mechanical高效的二维设计软件.pdf

Altair HWDesktop + Solvers 2021是一款非常好用且功能强大的建模可视化仿真解决方案，能够提供各种建模，仿真，可视化和优化工具来应对面临的各种挑战！轻松仿真以及预测评估大型的设备，提供最全面的开放式体系结构CE建模工具和功能。是最全面的开放式体系结构有限元建模工具之一，HyperWorks通过在一个解决方案中结合HyperMesh和HyperView的功能来实现FE建模和渲染的现代化。实现最快最好的建模和可视化，显着的视觉增强功能还有助于创建更易于使用的界面。在HyperMesh中，扩展了创建声学问题网格的可能性；壳体和梁模型的三维可视化的可能性已经出现。

滑模控制经典教材，Utkin编写校注，包含理论推导和控制系统设计实例分析

机械数据集 该存储库包含论文“使用深度转移学习进行高精度机器故障诊断”中使用的机械数据集。 所有数据都是传感器获取的原始振动信号。 方位数据集来自Case Western Reserve University方位数据中心（ ）。 对于数据文件的名称，例如“ B007_0”，第一个字母代表故障位置，接下来的三个数字代表故障直径（0.007、0.014、0.021英寸），最后一个数字代表轴承载荷（0、1、2、3 ）。 故障位置分为三种，B轴承滚动体，IR内滚道，OR外滚道。 我们使用的数据全部来自风扇端，在数据文件中标记为“ FE”。 变速箱数据集来自中国东南大学。 这些数据是从Drivetrain Dynamic Simulator收集的。 该数据集包含2个子数据集，包括轴承数据和齿轮数据，这两个数据集均在Drivetrain Dynamics Simulator（DDS）上获取。 转

对workbench中接触的设置进行了详细的讲解

生物力学开山鼻祖Y.C.Fung（冯元帧）1993年所著经典教材。 详细自洽，循序渐进阅读则几乎不需要参考其他书籍。 质量优良的影印本，图片精美清晰。

可以在中旺机械CAD2020简体中文精简直装版中运行的3个小VLX插件. 1.坐标标注. 2.cad齿轮工具箱. 3.CAD下的线切割插件,可以绘制齿轮轮廓和链轮轮廓。