Nastran Finite Element Analysis and Simulation Software
Automated Impact Analysis (AIA™) and Drop Test
Application of Impact Analysis in Industry
Impact analysis is an important consideration for a wide variety of product development projects from drop testing portable electronic products like laptop computers to assessing product packaging effectiveness. Automated Impact Analysis (AIA™) is an exceptional simulation tool because it makes a complex analysis easy to do while retaining the complexity of the underlying physical phenomena that are present in impacts.
Automated Impact Analysis (AIA) can also be used as a virtual Drop Test. Example shown is for a laptop computer.
The input is simple—define projectile initial velocity and acceleration. Complexity is handled by NEi Nastran solvers as they automatically setup surface contact between the projectile and part, determine the contact surface between the two, calculate the contact duration and time steps needed to capture an accurate nonlinear transient event, and determine the vibration characteristics of the colliding bodies. NEi Nastran AIA can provide a thorough and physically realistic simulation of impact because it takes into account surface contact, time duration of impact, and the vibration characteristics of the colliding bodies. This is much more comprehensive and useful than a simplistic imposition of force at a point found in other impact or drop tests simulations.
Benefits of Impact Analysis
Product development engineers can realize the following benefits applying impact analysis software:
Many consumer products with highly compressed design cycles, for example consumer electronic products, can realize faster time to market. Impact analysis helps by validating concepts early in the design cycle, reducing the number of prototypes required, eliminating the amount of physical testing that must be done, and avoiding time consuming redesigns.
Elements of an Impact Analysis
How It Works
Impact Analysis Using the Nonlinear Transient Solver
Automated impact analysis is one feature of the nonlinear transient solver in NEi Nastran. Using this solver, impact can also be set up manually for more control over the variables. Also, nonlinear events other than impact can be modeled, such as, post-buckling behavior and impact event sequences.
Post Processing Functions Available in the Editor
When Is An Explicit Solver Needed for Impact Simulation?There are impact events that are better suited to using an explicit FEA solver rather than the implicit NEi Nastran FEA solver used in the Automated Impact Analysis (AIA™). In these events, the following types of conditions are present: speeds are typically very high, there is a large deformation or large strain involved in the impact, there is material failure and material deletion from the model, and contact conditions are very complex. Examples of simulations that can benefit from an explicit solver include vehicle crash simulations, jet engine bird strike, metal forming processes, and many ballistics tests. NEi recommends NEi Explicit for these applications. NEi Explicit dynamics forms no element stiffness matrices and has no global stiffness matrix so it works with an extremely small memory footprint. This means you can solve problems with millions of degrees of freedom on a PC with a single processor. For even faster solutions, solve the problem in parallel using widely available dual and quad core processors. NEi Nastran users can easily transition to NEi Explicit because it uses the complete general purpose library of Nastran elements and is fully integrated with the Nastran Editor. See NEi Explicit for a full explanation and details.
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