ELOG - BHD Platform Progress status

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Mon May 9 22:19:06 2022, Koji, Update, BHD, BHD Platform Progress status

Mon May 9 23:18:44 2022, Koji, Update, BHD, BHD Platform Progress status 6x

Message ID: 16840 Entry time: Mon May 9 23:18:44 2022 In reply to: 16839

Author:	Koji
Type:	Update
Category:	BHD
Subject:	BHD Platform Progress status

I quickly ran the FEA model to check the resonant freqs of the BHD platform.
The boundary conditions were:

The platform was not loaded
FIxed constraints were given to the five legs

Don has optimized the cut-out size for the OMCs to increase the rigidity of the plate. Also, the ribbed grid is made at the bottom side.

The lowest mode is at 168Hz. Because there is no leg around, it seems reasonable to have this kind of mode as the fundamental mode.
The other mode lined up at 291Hz, 394Hz, 402Hz, ...
The mode freqs will be lower once the platform is loaded. But as the unloaded platform mode, these mode freqs sound pretty good numbers.

Attachment 1:

Screenshot_2022-05-09_224145.png 170 kB Uploaded Tue May 10 00:20:10 2022 | Hide | Hide all | Show all

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Screenshot_2022-05-09_224137.png 229 kB Uploaded Tue May 10 00:20:18 2022 | Show | Hide all | Show all

Attachment 3:

bhd_platform_168.png 130 kB Uploaded Tue May 10 00:21:26 2022 | Hide | Hide all | Show all

Attachment 4:

bhd_platform_291.png 138 kB Uploaded Tue May 10 00:21:34 2022 | Show | Hide all | Show all

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bhd_platform_394.png 196 kB Uploaded Tue May 10 00:21:37 2022 | Show | Hide all | Show all

Attachment 6:

bhd_platform_402.png 151 kB Uploaded Tue May 10 00:21:40 2022 | Hide | Hide all | Show all

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