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Offshore turbines pose several engineering challenges due to the demanding environmental conditions. Floating platforms for wind turbines must be optimized to achieve the lowest life cycle cost of the entire system. Offshore wind turbines are subjected to fiercer winds and require larger turbines than land-based wind initiatives. This necessitates the need for stronger towers to withstand wind-wave interactions. Modeling of soil-structure interaction becomes important. Control systems would be used to limit the response of the turbine system to stochastic wave loading. Several configurations are currently being tested as depicted in this paper that shows Adams being used for testing.
Simulation has helped companies overcome engineering challenges for onshore turbines and has played key role in understanding and solving these complex engineering challenges. Multidisciplinary (MD) simulation solutions from MSC.Software such as MD Adams and MD Nastran help simulate complex physics including mechanical system simulation with control systems, aeroelasticity, composites, material behavior, soil-structure etc. Will simulation take us offshore to the large scale adoption of offshore wind turbines? Print This Post
One thing that caught my attention was the common lament about the difficulty of isolator modeling. To quote the article: “One of the most difficult tasks in virtual testing is to model elastomer isolators such as bushings and rubber mounts accurately. Elastomer isolators usually have nonlinear load deflection relationship. The relationship is also frequency dependent.” What we at MSC have found is that the difficulty lies as much, if not more, in model parameter definition as it does in the actual isolator component modeling methodology. To that end, the recent Adams 2010 release includes not only improvements in modeling methodology of isolators, but an isolator parameter identification tool (IPIT) as well. The IPIT simplifies and accelerates the process of deriving model parameters from isolator measurement data. So, isolators with nonlinear and frequency-dependant properties can be more easily and accurately represented. Check out the Adams 2010 release information for more on the isolator improvements. They are covered in a new capabilities video and in the Adams 2010 product brief. Just one example of the how the road to great simulation can be smoothed. Print This Post
As we prepare to introduce our new release of Marc 2010, I felt compelled to talk about some of the product’s new features. There is an array of exciting new capabilities in the release that I think users will be thrilled to see. I know I was. Linear stress analysis is often the first thing that comes to mind when one refers to FEA, but most problems engineers face today during the design process involve complex interactions that are not well addressed with linear statics. Being a provider of CAE technology for 47 years now, we at MSC have witnessed nonlinear analysis become more commonplace in manufacturing industries with advancements in multi-core desktop systems and parallel processing technology. More engineers are doing nonlinear simulations as the technology finally becomes easier to use and as they begin to take advantage of advanced multi- processor computing power to run more analyses on bigger models in less time than with single CPUs. So…since most real-world problems are in fact nonlinear in nature, I think it’s time Marc is given the kudos it deserves. It truly does help engineers tackle the toughest of engineering problems, and we are sincerely happy to have such committed and happy Marc customers around the world. Here are some cool things that are brought forth in this new release: New Parallel Solvers Deliver Cost Savings & Better Performance: Users can now take full advantage of multi-core machines for parallelization and see significant benefits in performance and cost. The Marc 2010 release provides new solver capabilities that take advantage of multi-core systems without the need to purchase DDM licenses. Both shared memory and distributed memory parallel solvers are now available allowing significant speed up even with a single CPU run. With the new solver enhancements for parallelization, we have seen excellent scalability. A 300,000 DOF thermo-mechanical creep analysis of a ball grid array is solved 7.1 times faster with DDM compared to a single CPU run, while 700,000 DOF model is run 13.6 times faster. Contact Enhancements Allow Quicker Model Creation: A new procedure for contact based on segment-to-segment for 2D and surface-to-surface for 3D is now available. This method is beneficial for assembly modeling and interference fit problems. Users can expect to see more accurate and smoother results especially near contact boundaries. Large Deformation Enhancements Improve Convergence: Updated Lagrange analysis is improved to handle large shell and beam rotations more accurately and with improved convergence. This enhancement is beneficial for most Marc users who deal with large deformation and large rotation problems. Global Adaptive Meshing Increases Efficiency: Global adaptive meshing now works with two additional features, global-local analysis and EXLUDE option. By supporting these two features, users can make better use of global remeshing in difficult contact situations. Another significant enhancement related to remeshing is support for DDM. Until now, users could not use DDM if any of the contact bodies had to undergo remeshing. With this capability, users can solve larger models that undergo large deformation and need remeshing for better results, like in 3D seals and forming. Wear Improvements Speed Solution: This release introduces improvements for wear simulation. Users will see more accurate calculation of wear especially for deformable-deformable contact. Benefits include a faster solution, more accurate results and the ability to associate wear with contact bodies. Applications that will see advantages include disk brakes, cutting, rolling, engines, bearings, gears, linear sliding mechanisms, and tires. Multiphysics Enhancements Extend Magnetostatic and Electromagnetics: Marc has the capabilities to solve magnetostatic and electromagnetic field problems along with the ability to calculate the magnetostatic forces and ohmic losses experienced by any structure in the field. The specification of current loads is further enhanced in Marc 2010. In this release, practically occurring windings or current coils can be defined in the natural way and specified with current, instead of the current density. This feature takes care of winding cross-section and complex winding paths. This is implemented for the magnetostatic and electromagnetic analysis. With magnetostatic-thermal coupling, heat generation due to applied currents flowing through conductors in magnetostatic devices can be computed. Users can now determine the losses associated with ferromagnetic cores consisting of laminations of thin magnetic sheets, which are heavily used in power industry devices such as alternators, synchronous generators, DC generators and motors, transformers, induction motors, relays and switch gear. We hope you get the chance to try Marc 2010. It will be available this month.
Watch Marc 2010 preview videos http://pages.mscsoftware.com/MarcVideos.html For more information on What’s New in Marc 2010, please watch our on-demand webcast by visiting www.mscsoftware.com. Best, Leslie Print This Post
While putting together this webcast about tire and road modeling advances in Adams, I was reminded of a compelling difference between some users of simulation. Some are in competitive spaces in which almost any amount of simulation, no matter how small, provides a company distinct advantage. Others, like those in the automotive industry, are not. The vast majority of automakers already employ simulation to great degrees within their design processes. So, there, in order to gain a competitive advantage one must not just tighten the product development process with simulation but simulate better than their peers. Getting accurate results faster than the other team is a great way to get an edge. The functionality items I covered in that webcast achieve this end. I described savings from using integrated tools for fitting tire data and representing deformable roads. I quantified reductions in things like model load time and run time by using a CRG representation for high-resolution road profiles. Going through this reinforced to me that many can’t get by only accelerating the design process with simulation; they need the process of simulation, itself, accelerated. Are you one of them? Look around at your competitors and at your own simulation processes. Maybe it’s time to accelerate. MSC can help. Check out more recent accelerators in Adams for productivity and performance. Print This Post
Speedy Modeling & Assembly for Airframes
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