Structural dynamics simulation

Structural dynamics refers to the study of how structures respond to dynamic loads; such as vibrations, impacts, and oscillations, over time. In Simcenter 3D, this is achieved through advanced simulation tools that help engineers predict, analyse, and improve the dynamic behaviour of components, subsystems, and full systems.

Simcenter 3D uses finite element (FE) modelling and the Simcenter Nastran solver to simulate dynamic responses, including:

Natural frequencies and mode shapes
Transient and harmonic responses
Noise, vibration, and harshness (NVH)
Rotor dynamics
Fatigue and failure prediction

Simcenter 3D Response Dynamics software is an integrated solution that makes dynamic analysis more accessible and efficient for the analyst. It allows you to predict the forced response of structural systems under various loading conditions in a single graphical user environment, thereby eliminating the complexity of setting up and launching analysis and providing rapid insight into dynamic behavior. Analysis information can then be used to
perform design studies to enhance the new product development process and confirm the quality of designs prior to physical prototyping and production.

Simcenter 3D Noise and Vibration Modeling offers a comprehensive set of noise and vibration pre/post capabilities addressing your need to build, understand, evaluate and optimize the noise and vibration performance of complete system and assembly models.

• Gain valuable insight into the noise and vibration performance of your design
• Use data from measurements and previous simulations to create relevant load cases
• Use dynamically equivalent, reduced component representations in your assembly model to speed up response
analysis

Operational loads or vibrations are very important for accurate response prediction but are often impossible or difficult to measure directly. Simcenter 3D Load Identification enables you to compute dynamics loadings of a structure for dynamics or acoustics. You can compute acoustic loads as well as structural loads.

Simcenter 3D Load Identification offers two ways of identifying the operational forces from measured data, either by a direct stiffness method or by an inverse matrix method. Using the direct stiffness approach, the relative displacement (or velocity or acceleration) from the input vibration data and input frequency response functions (FRFs) are used to compute the forces at node locations on your finite element model (FEM). The inverse matrix method allows you to compute an estimate of the operating loads, based on operational measurements, such as accelerations and measured FRFs.

The Simcenter 3D Noise and Vibration Response product provides users with the capability to perform modal-based forced response, FRF-based forced response and FRF synthesis to gain insight in the vibration or vibro-acoustic performance of a system. It is an alternative for users who have structural solvers from third party or for users who cannot subscribe to Simcenter Nastran.

The Simcenter 3D Assembly Composer is a streamlined product to create system level FE models from
system FE models. It is a very practical tool for defining hybrid NVH models by combining FE subsystems with reduced (test/FE) components in the form of mode sets for instance. It can also be used as a streamlined solu-
tion to define full vehicle NVH models starting from subassembly models (BIW, door, suspension…).

Simcenter 3D FE Model Correlation software enables you to quantitatively and qualitatively compare
simulation and test results, as well as two different simulations. It provides the tools needed to geomet-
rically align the models, pair the shapes from both solutions, view mode and operational shapes and
frequency response functions and calculate/display correlation metrics.

Simcenter 3D FE Model Updating software is an advanced correlation tool designed to automatically
update FE models to match real-life test data or other FE model results. The tool is fully integrated within
Simcenter 3D Engineering Desktop, making the updating process efficient, intuitive and productive.

Simcenter 3D Rotor Modeling is a comprehensive environment for pre- and postprocessing models used for rotor dynamics analysis using the Simcenter Nastran Rotor solver. Simcenter 3D Rotor Modeling guides you through the typical workflow of defining your rotors, bearings, and assemblies and then helps you set up the simulation solution parameters. Simcenter 3D Rotor Modeling also takes full advantage core Simcenter 3D Engineering
Desktop capabilities to easily edit model geometry and keep your rotor simulation models in-synch with
your design. The rotor modeling environment is where you also efficiently evaluate the results of your simulations visually and graphically so you can easily determine if your rotor designs are performing to your requirements.

Simcenter Nastran Dynamic Response software is the core solver for dynamic finite element analysis (FEA). It enables the Harmonic response analysis of a component or assembly subject to time- or frequency-varying excitations. Assessing dynamic response of a structure under different operating conditions is critical to industries such as automotive, aerospace, consumer products and other sectors that rely on electronic devices. It is possible
to perform numerous what-if studies by virtually investigating the product’s performance in various dynamic operating conditions by using the rich analysis tool set supported by Simcenter Nastran Dynamic Response

Simcenter Nastran Advanced Dynamics is a cost effective bundle that provides a rich set of functionality for advanced dynamic analysis. It allows the user to produce reduced order models and use them in a system analysis. The reduced order model can be a modal model, an external superelement or an FRF representation. The advanced dynamic analysis product also features RDMODES, which is a fast eigenvalue solver for large models with many modes. Coupled with fast frequency response, large models with many modes and many frequencies can now be solved rather quickly. The advanced dynamics product also offers high performance computing (HPC) capability via. distributed computing or DMP.

The advanced dynamics product also includes direct matrix abstraction program (DMAP). This product is the gateway to openness in Nastran. Users can alter the regular solutions and tailor it to meet their requirements.

Simcenter Nastran Rotor is the solver for simulating a variety of rotor dynamics analyses for mechanical engineers studying industrial rotating machinery applications, like gas turbines, pumps and more. Understanding critical operational speeds and predicting survivability of rotating systems is a critical, yet challenging task. Simcenter Nastran helps you determine these critical criteria by accounting for gyroscopic effects and centrifugal loads in a wide range of situations.

Pre- and postprocessing for Simcenter Nastran Rotor is done using the Simcenter 3D Rotor Modeling product.