From: Arthur W. Brooks
Sent: Tuesday, July 24, 2007 12:09 PM
To: Thomas G. Brown
Subject: RE: Stage 3 VV Support - Lateral Load

Attachments: Elastic_Collision.xls


Tom,

I made a (hopefully conservative) estimate of the collision between the MCWF (25000#) and the
 VV(?6000#). Using the 1 in/s velocity of the MCWF (based on the Crane max speed) the velocity
 of the lighter vessel will be ~1.6 in/s after colliding elastically. I calculate a lateral 
spring constant of ~30 Kips/in for just the port 12 leg (which should be more representative)
 from the ANSYS model based on 1000# force and .032" deflection. Together this leads to a 
estimated collision force of 1090 lbs, not far from what I assumed.

Art  

-----Original Message-----
From: Arthur W. Brooks 
Sent: Tuesday, July 24, 2007 10:59 AM
To: Thomas G. Brown
Subject: Stage 3 VV Support - Lateral Load

Tom,

I'm having trouble with the real VV model so I fell back to your first model to look at gravity plus
 lateral loads. I'm getting sizable port 12 base bolts stresses (~46 ksi) from bending with just 
1000# lateral load. We may need to strengthen the u channel the bolt is in.

Did you see similar results in mechanica?

The model used doesn't provide a realistic stiffness for the lateral force from which to estimate 
dynamic the true load; the 1000# is just a guestimate.

Art