Identification of dynamic natural frequencies and viscosity damping coefficient for a large-scale structure in practical working condition is a very difficult problem.

大型构件在实际工作环境中的系统动态固有频率和粘性阻尼系数辨识一直是一个“棘手”的问题。

youdao

Wellbore hot fluid circulation is a practical technology suitable for the production of high pour-point and high viscosity oil.

井筒热流体循环是适用于开采高凝固点、高粘度原油的一种实用技术。

youdao

A simple and practical falling-ball viscometer, which can be applied into the automatic instrument with the need of viscosity control are introduced.

介绍了一种落球式粘度计，具有结构简单、实用的优点，可以应用于需要对粘度进行反馈控制的自动化装置。

youdao