Determine the structural harmonic response based on frequency-dependent loads. Recover displacement, velocity, acceleration, stress, and strain. Identify how a structure responds to a given load across a range of excitation frequencies.
Autodesk Nastran In-CAD uses the Autodesk Nastran solver for more accurate and faster nonlinear transient analysis. This type of analysis can include all types of nonlinearities at the same time: large deformations, sliding contact, and nonlinear materials.
Assess potential problems, such as vibration-related operator fatigue or structural fatigue, due to structural loading in generators, rotating equipment, or anything mounted on a vibrating platform. View the normal modes or natural frequencies of a structure that might be subject to dynamic loading. Understanding normal modes can help guide you to reduce the impact of shaking or vibration by redesigning or reorienting loads.
A standard modal analysis cannot account for applied loads. Autodesk Nastran In-CAD software provides specific tools to capture true stiffness when complex loading is present. Like the strings in a guitar or piano, increased tension levels can affect the operational stiffness and dramatically increase the natural frequency of a structure. Tools include spinning shafting and pressure vessels.
Gain insight on long-term structural robustness for products whose operation must be characterized by power spectral density inputs, such as aircraft and spacecraft structures and industrial equipment. Structures subjected to road load or fluid flow-induced vibration experience dynamic energy that can’t be quantified simply by frequency and amplitude. Loading over a representative period can indicate some consistency and predictability.
This feature lets you capture all forms of nonlinearity in transient or time-varying events so you can better explore dynamic responses to dynamic loads, or impulses that result in resonant vibration or stress amplification.
Show material nonlinearity (material stress-strain data), contact (opening and closing of gaps and sliding), and large displacement and rotation (large deflection) effects in analysis models for interlocking equipment, and gears and blast analysis. You can also include transient and inertia effects.
Simplify and automate a complex, time-consuming simulation task. Automated drop test is ideal for performing projectile impacts and virtual drop tests for items such as:
The test requires a minimum of input data for the analysis—projectile velocity and acceleration—to determine the time steps, duration, and complex contact interaction between projectile and target. The analysis provides a thorough and physically realistic simulation of impact. It also offers insight into dynamic, implicit, nonlinear behavior or real-world impact problems.
Autodesk Nastran In-CAD software includes contact modeling options to help you explore more natural interactions between parts, and to help alleviate guesswork on a simplified load or restraint. The Autodesk Nastran In-CAD solver makes easier work of inherently nonlinear computations. Model press-fits, gears, mechanical comonents, and assemblies with different kinds of contact, including sliding, friction, and welding, to produce simulations with real-world fidelity.
Capture complex nonlinear phenomena such as plasticity (post-yield permanent set), hyperelasticity (elastomers), and shape-memory effects. Model a wide range of materials, from metals to rubbers and soft tissue, in a single virtual test. Prediction with simple material models can lead to erroneous design decisions. Nonlinear options in the material library include resilient mounds, composite materials, fracture and failure analysis, and more.
Take advantage of simple handling of complex ply data. Get reliable and insightful results from analysis based on failure indexes, like Puck and LaRC02. Progressive ply failure analysis helps determine how a composite structure responds beyond first ply failure. 3D solid composite element analysis accurately captures transverse shear in composite structures.
Determine the response of a structure over a period of time under the influence of constant or time-dependent loads. Static analysis shows how a structure will respond to loading. In the event of impulse loading or other time-dependent loads, structures may behave differently than their end state. Transient response helps you investigate the behavior of a part on its way to this end result.
Analyze the structural behavior in response to the imposition of random dynamic loads. Simulated conditions include road vibration, wave cycles, engine vibration, and wind loads.