HAMMER

Hello Shoujun, 

HAMMER enables the user to use one of four friction methods including steady, quasi-steady, unsteady and unsteady-vitkovsky. The unsteady friction methods tend to be the most accurate.

You can find detailed information about these 4 friction methods in the help documentation. 

In addition below wiki explains differences between "Unsteady" vs. "Unsteady - Vitkovsky" transient friction methods, please go through it. 

"Unsteady" vs. "Unsteady - Vitkovsky" transient friction methods in HAMMER 

Google Translation

寿君，您好

HAMMER 使用户能够使用四种摩擦方法中的一种，包括稳态、准稳态、非稳态和非稳态-vitkovsky。非定常摩擦法往往是最准确的。

您可以在帮助文档中找到有关这 4 种摩擦方法的详细信息。

另外下面的wiki解释了“不稳定”与“不稳定-维特科夫斯基”瞬态摩擦方法之间的区别，请仔细阅读。
HAMMER 中的“不稳定”与“不稳定 - Vitkovsky”瞬态摩擦方法 

你好，请问一下在这四种方法里面，它们哪些考虑了流体惯性与系统弹性？或者只考虑了其中一种。谢谢

Are you able to converse in English? I see that you have also posted on the ChinaFirst forum here.

I have updated the following article with more details on when each method is typically used and why, along with a copy of the details in the Help documentation explaining how each method calculates the friction factor: Understanding the Transient Friction Methods in HAMMER

我已经更新了以下文章，详细说明了每种方法的使用时间和原因，以及帮助文档中解释每种方法如何计算摩擦系数的详细信息副本：Understanding the Transient Friction Methods in HAMMER

Are you able to converse in English? I see that you have also posted on the ChinaFirst forum here.

I have updated the following article with more details on when each method is typically used and why, along with a copy of the details in the Help documentation explaining how each method calculates the friction factor: Understanding the Transient Friction Methods in HAMMER

我已经更新了以下文章，详细说明了每种方法的使用时间和原因，以及帮助文档中解释每种方法如何计算摩擦系数的详细信息副本：Understanding the Transient Friction Methods in HAMMER