Simulate, analyze for fast product development

With its unified interface, MSC.visualNastran 4D (vN4D) from MSC.Software (Santa Ana, CA), allows an engineer to complete the analysis of a system of parts/assemblies involved in multibody motion and interaction, to check its structural integrity with finite element analysis (FEA) methods, and to control it with industry standard Matlab/ Simulink.


For an expanded version of this article, click here .

With its unified interface, MSC.visualNastran 4D (vN4D) from MSC.Software (Santa Ana, CA), allows an engineer to complete the analysis of a system of parts/assemblies involved in multibody motion and interaction, to check its structural integrity with finite element analysis (FEA) methods, and to control it with industry standard Matlab/ Simulink.

Integration of Matlab/Simulink into vN4D provided an excellent tool for control engineers who want to couple a Simulink model to the physical world and extract meaningful results and feedback. Based on a Simulink block named vNPlant- developed for vN4D-the data 'handshake' is done between the control system in Simulink and the dynamic system in vN4D

Any meter in vN4D becomes a candidate for input and output in the vNPlant block. A new feature, 'FEA Meter,' is used to monitor FEA-related results in numerical or graphical display. Effects of these results can be used with vNPlant to trigger events and processes on the control side of the system.

Since the Simulink side of the interface drives the simulation, the animation step is key to guarantee synchronization between Matlab and vN4D. When simulating bodies in contact, use of a variable step is the solution for remaining in contact with Simulink. Unfortunately, the penalty may be increased computation time.

Numerous new features

One of the improvements in this version is how information is set up for each part or assembly, its connections and constraints, as well as its properties (see graphic).

The new 'Paint the Constraint' concept eases this function, relative to earlier versions by specifying the starting point and dragging the constraint to the endpoint. Coupling can also be extended into the modeling. For example, a gear model can be used in a simple form to verify kinematic performance, as well as in a true form with full contact resolution to measure gear loads. Contact is treated with two possible models: a smooth surface for parts always in contact, or a faceted surface, parametrically defined for better contact detection.

The Formula Window represents one of the key parts of this vN4D version. It offers various ways to assign and extract information from models, such as position, velocity, math, logic, or prescribed functions. With built-in functions, tabular results can be created and used in the simulation.

Using a subset of MSC.Nastran (MSC's main software package), FEA capabilities of vN4D can help design engineers get a feel for the structural performance of their designs without being experts. While limited to linear models, FEA tools cover structural, steady-state thermal, modal, and buckling types of analyses with a new fast, iterative solver.

A typical procedure entails just a few steps, with solutions and results only a few mouse clicks away. FEA can be run for a single-load application, or linked to motion with dynamic loading and calculation of results for each frame. Results are calculated on demand, but the settings can be tailored for specific output. A 'Getting Started CD,' along with online context-sensitive help on any part of the program, provides guidance through new features.

Data sharing in vN4D is also seamless due to its integration with all major players in the midrange CAD market. As a result, vN4D supports geometry transfer in various formats while all constraints, loads, and boundary conditions remain intact.

vN4D targets design engineers in need of an analytical tool in the early stages of design. Without the need to rely on experts or advanced software, its capabilities go beyond these limits in many respects. For a new user, this version closes the loop on a complete analysis and simulation package.

This review is based on vN4D 2002 and Matlab/Simulink in respective versions 5.3/3 or 6.1/4.1. Hardware requirements are Microsoft Windows NT, 98, 2000, or ME, P-II w/128 MB RAM, 32 MB VRAM, and 300 MB available disk space for installation.

For more information, visit or

Author Information

Paris Altidis is a staff engineer at Borg Warner Automotive, Chicago, IL.


More online at

A longer version of this review

Live link to a tutorial with an example application of vN4D and Matlab/Simulink

No comments
The Engineers' Choice Awards highlight some of the best new control, instrumentation and automation products as chosen by...
The System Integrator Giants program lists the top 100 system integrators among companies listed in CFE Media's Global System Integrator Database.
The Engineering Leaders Under 40 program identifies and gives recognition to young engineers who...
This eGuide illustrates solutions, applications and benefits of machine vision systems.
Learn how to increase device reliability in harsh environments and decrease unplanned system downtime.
This eGuide contains a series of articles and videos that considers theoretical and practical; immediate needs and a look into the future.
Big Data and IIoT value; Monitoring Big Data; Robotics safety standards and programming; Learning about PID
Motor specification guidelines; Understanding multivariable control; Improving a safety instrumented system; 2017 Engineers' Choice Award Winners
Selecting the best controller from several viewpoints; System integrator advice for the IIoT; TSN and real-time Ethernet; Questions to ask when selecting a VFD; Action items for an aging PLC/DCS
This digital report will explore several aspects of how IIoT will transform manufacturing in the coming years.
Motion control advances and solutions can help with machine control, automated control on assembly lines, integration of robotics and automation, and machine safety.
This article collection contains several articles on the Industrial Internet of Things (IIoT) and how it is transforming manufacturing.

Find and connect with the most suitable service provider for your unique application. Start searching the Global System Integrator Database Now!

Future of oil and gas projects; Reservoir models; The importance of SCADA to oil and gas
Big Data and bigger solutions; Tablet technologies; SCADA developments
SCADA at the junction, Managing risk through maintenance, Moving at the speed of data
Automation Engineer; Wood Group
System Integrator; Cross Integrated Systems Group
Jose S. Vasquez, Jr.
Fire & Life Safety Engineer; Technip USA Inc.
click me