A new returnable actuator disk of metal seal structure butterfly valve was presented, and its principle, force analysis, characteristic of the actuator were discussed as well.
提出了一种双向压金属硬密封蝶阀蝶板可逆回转机构，讨论了可逆回转机构的工作原理、受力分析及特点。
Based on the force analysis of single bubble movement and movement characteristic research of many bubbles in random time section, the mathematics modeling of many bubbles movement was built up.
在对水下单气泡运动受力分析及任意时间剖面多气泡运动特性研究的基础上，建立了水下气泡群运动数学模型。
The restoring force model and the method for dealing with the characteristic value are also given, which can be applied to the elastoplastic dynamic analysis.
还给出恢复力模型及其特征点的取值方法，可进行底部框架抗震墙砖房的弹塑性动力分析。
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