https://communities.bentley.com/communities/other_communities/chinafirst/w/chinawiki/47737/cdm-cmen-USTelligent Community 12https://communities.bentley.com/communities/other_communities/chinafirst/w/chinawiki/47737/cdm-cmMon, 30 Mar 2020 07:11:16 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:393b70cb-71a1-435e-8b1e-f1b92e04c1c8Qiang Hehttps://communities.bentley.com/communities/other_communities/chinafirst/w/chinawiki/47737/cdm-cm#commentsCurrent Revision posted to 技术资料库 by Qiang He on 3/30/2020 7:11:16 AM<br /> <p>在seastate中，水动力荷载计算公式Morison公式中CD, CM系数设置命令为CDM。在CDM命令第62列存在针对大直径（杆件直径相对于波长较大）杆件惯性力计系数CM的修正选项。当该选项设置为&rsquo;D&rsquo;时，将根据Maccamy and Fuchs方法，修正CM系数，考虑波浪绕射效应。</p> <p><img src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-04-10/pastedimage1585552225842v1.png" alt=" " /></p> <p>修正后的值会覆盖CDM卡中所设置的CM值。具体各个杆件的CM值，可以在list文件的&lsquo;PARAMTERS USED FOR HYDRODYNAMIC LOADS&rsquo;报告中查看（该报告可以通过在LDOPT卡第68-70列设置&lsquo;MPP&rsquo;</p> <p><img src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-04-10/pastedimage1585552250792v2.png" alt=" " /></p> <p>这种覆盖可以通过member group override或者 member override来重新设定新值覆盖。</p><div style="clear:both;"></div>