Product category:
FEA and structural analysis software
News Release from: NEi Software | Subject: NEiNastran
Edited by the Engineeringtalk Editorial
Team on 21 July 2005
FEA software is fully NAVSEA compliant
NEiNastran FEA software has several new enhancements of its NAVSEA compliant simulation for the response of ship components to shock-loads like mine, torpedo, depth charge or missile detonation.
NEiNastran finite element analysis (FEA) software has several new enhancements of its NAVSEA compliant simulation for the response of ship components to shock-loads like mine, torpedo, depth charge or missile detonation In addition, special training can be be offered in the use of the analysis technique
This article was originally published on Engineeringtalk on 5 Dec 2005 at 8.00am (UK)
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Interface looks after contacting surfaces
The next version of NEiNastran will contain a fully automated interface to handle surface contact and weld element generation in assembly models.
Licensing scheme to cut the cost of analysis
NEiNastran V9.0 will contain token based pricing which will allow for additional technology at a fraction of the cost.
The solution is based on the US Navy's Dynamic Design Analysis Method (DDAM) which has been used for more than three decades to validate ship-borne shock sensitive equipment.
All mission-essential equipment onboard surface ships and submarines must be qualified for shock loads, like, masts, propulsion shafts, rudders and exhaust uptakes.
The new enhancements include the ability to handle very large modal analysis models.
Further reading
Upgrade for analysis and simulation
Enhancements in the latest version of NEiNastran will provide significant benefits to engineers in the design, analysis and simulation phases of product development.
Finite element analysis is made for SolidWorks
NEiWorks not only provides all of NEiNastran's comprehensive analysis capabilities to SolidWorks users, but also allows sharing of data across the full community of other Nastran users.
A recent trend has been to require large numbers of modes, in the order of thousands, to satisfy the DDAM Modal Effective Mass requirements.
This enhancement streamlines the data flow inherent in the DDAM calculations to provide an efficient way to effectively handle unlimited numbers of modes.
The DDAM method is based on combining the most important modal response with a square root sum of squares (SRSS) of the other responses.
Support is now provided for graphical output of this response mode number for DDAM.
The mode number is listed in the status result measure written to the FEMAP binary results neutral file and can be viewed as an assignment plot.
Modal summation solutions based on von Mises stress for shell and solid elements and maximum absolute stress for line elements have been introduced based on feedback from key maritime clients.
A new graphical user interface in the NEiNastran editor supports input of classified data without compromising that data.
A direct line of communication to the NEiNastran solver is used to achieve this.
The new interface was requested by and the design was implemented with the assistance of a major naval defence contractor and the Department of the Navy.
NEiNastran DDAM provides the maritime industry with several major advantages in shock simulation and analysis.
NEiNastran is fully NAVSEA compliant - an important consideration as not all FEA software meets this criterion.
For example, NAVSEA compliance requires calculating invariants, like von Mises stresses, directly.
NEiNastran DDAM is integrated into the core NEiNastran program, thereby eliminating the need for external modules or those that are addon customisations.
Add-on modules are often problematic because their lack of integration can be time consuming and difficult to work.
NEiNastran DDAM boosts productivity with its easy set up, fast processing time, extensive diagnostics, and the use of various techniques for eliminating repetitive, time consuming tasks, such as the modal database/restart feature.
Noran Engineering supports NEiNastran DDAM with specialised training classes at its facility.
In addition, arrangements can be made for training at the customer's site.
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