确定四边形截面的方形截面的前 16 个自振频率。 八个悬臂梁中的每一个由四个梁单元模拟,并在末端有一个铰支座(限制 x 轴和 y 轴挠度)。 振动只考虑 xy 平面。 该问题是根据规范 NAFEMS 基准定义的。
该模型初始定义了一个具有间隙和两个弹簧的单质量系统的柔性体系。 Determine the natural oscillations of the system - deflection, velocity, and acceleration time course.
该验算示例是基于验算示例 0122 编写的. A single-mass system without damping is subjected to an axial loading force. An ideal elastic-plastic material with characteristics is assumed. Determine the time course of the end-point deflection, velocity, and acceleration.
施加阻尼器的单质量系统受到恒定的力。 Determine the spring force, damping force, and inertial force at the given test time. In this verification example, the Kelvin--Voigt dashpot (namely, a spring and a damper element in serial connection) is decomposed into its purely viscous and purely elastic parts, in order to better evaluate the reaction forces.
设置阻尼器的单质量系统受到恒定的荷载。 Determine the deflection and velocity of the dashpot endpoint in the given test time.
数理摆由一根绳索和在其末端的一个质量点组成。 The pendulum is initially deflected. Determine the angle of the rope at the given test time.
一根细柱由初始应变张拉并初始变形。 Determine the deflection of the test point at the given test times.
双质量振型由两个线性弹簧和质量点组成,这些弹簧和质量集中在节点处。 The self-weight of the springs is neglected. Determine the natural frequencies of the system.
定义一个简单振动器,由质量 m(只考虑 x 方向)和刚度为 k 的弹簧组成。 The mass is embedded on a surface with Coulomb friction and is loaded by constant-in-time axial and transverse forces.