vibration node

The dynamic equation of this system was established through applying the finite element method to make the chain discretize into the combined body of a great number of basic units connected with node and regarding each basic unit as to the pole unit of longitudinal vibration.

应用有限单元法将链条离散化为若干个以单个链节为基本单元在结点相连接的组合体，视每个基本单元为纵向振动的杆单元，建立该系统的动力学方程。

It is proved that if the concentrated mass is small and located at the node or antinode of some mode normal vibration of the nonloaded beam, the frequency has a maximum or minium value as the position of the concentrated mass varies.

理论证明：如果集中质量很小（对梁的质量而言），当集中质量的位置改变，位于无载梁的某次简正振动的节点（腹点），振动频率具有极大（极小）值。

Quasi-conforming four node plate bending element for thin plate vibration analysis

拟协调四节点板弯曲单元在薄板振动分析中的应用

Both the computer simulation and experiment results show that this vibration system is in chaos motion while the joint nears node of standing wave, and is in stationary motion while the joint nears antinode of standing wave.

仿真结果与实验结果都表明：当连接点接近驻波波节处时，振动系统处于混沌运动状态；而当连接点接近驻波波腹处时，系统处于稳定驻波运动状态。

Finally, host computer receives the data, displays the real-time waveform, and analyzes the frequency of bridges' vibration, the current value and the time average value of each node.

最终上位机对接收到的数据进行实时波形显示，桥梁振动频率分析，各个节点的当前值与一段时间内的平均值分析等。