Original Date: 04/07/1997
Revision Date: 04/14/2003
Information : Finite Element Analysis and Dynamic Analysis
(equipment: ANSYS Version 5.3, finite element analysis software; MECHANICAL Version 18, structural and dynamic analysis software)
Rock Island Arsenal (RIA) has state-of-the-art capabilities in finite element structural analysis and dynamic analysis. This capability is used to evaluate functional capability, repairability, producibility, failure analysis, Request For Waiver/Request For Deviation/Engineering Change Proposal (RFW/RFD/ECP) submittals, and product improvement proposals (PIPs) for components and systems acquired or produced at RIA. This capability is also used to support local engineering and manufacturing companies through a program called Center for Manufacturing Regional Economic Development.
The old method of determining structural integrity was to build prototypes and run them though operational testing, and then perform failure analysis for determining areas that required redesign. This was costly and time consuming. The new process can model the initial design in the computer without building an initial prototype. Figure 3-1 is a dynamic analysis model of the latch box design for the prototype 155mm light weight howitzer using MECHANICAL motion modules. These models can be simulated with various loading conditions and boundary conditions. If any design deficiencies are found, the models can be modified to correct the deficiencies. This computer analysis process can be repeated until an optimized design is obtained without any prototype being manufactured. After a design has met all functional requirements, a prototype can be manufactured for full-scale live testing and comparison with computer analysis results. This new process has both tangible and intangible benefits that include minimized prototype manufacturing costs; reduction or elimination of time delays due to prototype redesign; and achievement of an optimized design. For current product engineering support, this new technique is an invaluable asset in determining functional capability, repairability, producibility, failure analysis, RFW/RFD/ECP submittals, and PIPs.
Figure 3-1. Dynamic Model for Latch Box Design
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