Ashes of modern CAE

Study: Tian Feng

Most of the technology is there to promote improvements in technology. If the old technology can no longer improve, we must break the old thinking, a new framework to replace! This thing is taking place in the modern CAE sector!

Classic CAE software in order to maintain compatibility, have long dragged a heavy burden. Although the share of the market, but the response capacity decreased, can not meet the changing needs of users, like the old car, authoritative but not skillfully. Now, whether it is nonlinear, dynamic, fluid, electromagnetic, or optimization, in all areas of new CAE technology continues to challenge the classic. The CAE industry seems to be experiencing a rebirth of a change, so that modern CAE in the world with renewed vitality. If we observe several currently active in the CAE software market will really appreciate this wonderful change.

1. Flexible structure calculation software

Most say on the ashes of software should be nonlinear and multi-field coupling technique known ANSYS software.

ANSYS is a fact, with a long history of CAE software, produced in 1970 from the now 36-year history. However, this procedure had a strange experience: the end of last century, ANSYS has not released a new version of the past three years, until she almost lost patience with the user. In fact, this three years, ANSYS has experienced a Nirvana: She's founder, Dr. John Swanson led his team to spend three years, using the latest programming technology to re-write the procedural framework for the classic modern IT technology with ANSYS transformed into a vibrant and new software. Workbench introduction to her loyal customers prove they are not white and so on for three years. ANSYS with her series of excellent patient users of new technologies to give a return: CAD model of a two-way interaction parameters, the assembly of Relationship Intelligence to judge, contact element automatically creates unique variational technique, deep non-linear technology, advanced multi-field coupling technology, high-performance computing first breakthrough 100 million degrees of freedom, the rapid integration of acquisition programs ... ... too many leading ANSYS technology reflects the young and healthy, to re-establish the procedural framework for the ANSYS many opportunities! Finally jumped in the beginning of this century the world's largest provider of CAE software.

2. Rigid body dynamics calculation software

And compared to traditional rigid body dynamics software, RecurDYN LRT fast horses, young and very fighting.

RecurDYN by Korean FunctionBay company launched the first version in 1997, entered China in 2002. Produced relative to the 70's body dynamics software for nearly 20 years later. But the recursive algorithm in the last century 80's achievements in the rapid development of the RecurDYN special. Even the traditional emotional body dynamics software users have to wonder over this new software excels.



When RecurDyn developer of innovative use of local coordinate system to describe the body parts when the recursive algorithm found in institutional dynamics calculation of the strange value. In the local coordinate system, describe each part of the equation is simple. A plane problem, for example, the classic software needed by the global coordinate system to describe a group of ternary quadratic component, in RecurDYN only need a quadratic equation can be. And a description of each component exactly the same form, can be recursive algorithm. Of this program, I had to sigh: most valuable innovative solutions that are often the simplest! RecurDYN the local coordinate system and the recursive algorithm are combined to greatly reduce the scale of the problem solving, solution faster and more stable. Solving large-scale, high-speed and pathological issues greatly exceeded the performance of other similar software.

In addition, RecurDYN ability in dealing with flexible body also stronger than the opponents. Flexible body in dealing with other software when needed third-party software in the first flexible body modal analysis. The RecurDYN only grid model, the calculation of flexible body can be in the local direct and does not require the participation of third-party software, flexible body.



Quick contact algorithm is RecurDNY another major feature. Traditional software problem in a large contacts almost helplessly. Even if the form provides access to defined functions, but the solver is the faithful, to solve the slow speed, almost no one interested in waiting for results. The RecurDYN similar procedure for solving the speed of the dozens or even hundreds of times.

3. Fluid Dynamics Software

In Computational Fluid Dynamics (CFD) in the field looking for second-generation leader, the prime of life CFX software into my eyes.

CFX software produced in the late 90s of last century, than the first generation of CFD software, the new 15 years, only 10 years. The last 10 years, is the world's most advanced CFD technology for 10 years. Therefore, using the second generation of CFD technology, CFX an advantage. As a result of the new structure of modern programming techniques, CFX CFD in absorbing the latest technology when there is no obstacle, and the first generation of CFD software at this time becomes a heavy burden. In the calculation of accuracy, convergence speed and stability and, CFX have outstanding performance. A large number of tests show that, CFX convergence rate faster than the first generation of CFD programs one to two orders of magnitude. AIAA conference in 2003, the organizers use multiple CFD software, the DLR-F6 wing-body combination and the DLR-F6 wing-body combination of a series of engine pylons under the angle of attack aerodynamic drag, lift, pitching moment calculated, CFX calculations show better than the time involved in testing the accuracy of any of a CFD software, showing the advantages of the second generation of CFD technology.

4. Electromagnetic simulation software

In the electromagnetic simulation (CEM) in the field, there is also an exciting scene.

FEKO software industry as a dark horse CEM, interpretation of the new architecture of the old structure of the breakthrough. Finite element method in 70 to the rapid development of the early 80s to early electromagnetic simulation software into the glass roof. Moment method and the high-frequency approximation method in the rapid development of the late 80s, the successful achievement of the FEKO software.



EMSS FEKO from South Africa in 1995, the company launched the first version, entered China in 2001. Later than the same software for almost 20 years, but now has become the CEM software, one of the most unique in the world.

To illustrate the FEKO's unique needs to be a reference to the concept of electromagnetic field computation - electrical measurements. Electrical size is the geometric dimensions and the ratio of relevant electromagnetic wavelength. Computational Electromagnetics requirements, both on the target space or the propagation of electromagnetic waves (such as air), cell side length of not greater than the wavelength of 1 / 10. This means that if the structure size is greater than 10 wavelengths, the analysis requires the calculation of the grid will be very many (often referred to as TV size issues). Finite element method (differential method), especially because this method requires space on the wave propagation need to be meshed. Grid computing makes too much too often and been abandoned.

FEKO adopt the method of moments (MOM)-based integration method, such methods only goal of the calculation of the mesh, wave propagation in space may not be meshed, it will surely reduce the overall number of Er Shi grid computing possible. And FEKO also PO / UTD / FMM and other similar methods that will calculate the size of further expansion of electricity, making FEKO become the only problem to solve electrically large electromagnetic analysis of business processes.

In the field of aerospace and a large antenna, TV size issue has been a very difficult problem. In particular, account will be airborne antenna must be considered when the antenna, the antenna and the mutual coupling between the aircraft, which typically electrically large problem is finally resolved by FEKO.

5. Design optimization software

Variational technique based on the design optimization DesignXplorer VT had a fire lit, and the more intense burning. DesignXplorer VT was introduced in 2001 ANSYS multi-objective optimization software is ANSYS 2000 acquisition of Parametric Technology Corporation CADOE France, will integrate its technology following the launch of the new module Workbench.

Optimization algorithm has become a vast and complex field, now people are still enthusiastic about her. But no matter how good the new algorithm, can not escape his point: the need for a large number of iterative calculations. The more design variables, the more iterations required. Rocket ship for the aircraft or aircraft engine car such a complex product design variables very much, because a large number of iterations required to optimize in fact meaningless. Lushan in the optimization algorithm into the so-called superior algorithm, only quantitative, not qualitative change. But DesignXplorer VT out of Lushan, creating a surprising way: variational technology (VT: Variational Technology), this technique only one calculation, it can go to the optimization results.



VT technology deep into the CAE program kernel, the CAE matrix (stiffness matrix, mass matrix, etc.) of all elements of the design variables change to function (CAE classic elements of the matrix is the value type), so that the function of CAE analysis process, the results naturally also a function of design variables. Using this algorithm, only a "one solution" of the entire design space can be the response surface, through the check directly to obtain the optimal design. Regardless of the number of design variables, this "one solution" of the time ordinary finite element solution of 5 times. Therefore, the more design variables, it is the more obvious advantages.



In fact, VT technology is a generic technology companies in the ANSYS software has many applications. EMAG HF electromagnetic module in its S-parameters in solving the sweep when calculated using a calculation of VT only need to complete the entire frequency band hundreds of S-parameter calculation. Nonlinear iterative calculation in Mechanical, through the formation of historical information on the next iteration step iterative best forecast, making the total number of iterations at least, greatly reduce the computing time. When the design variable changes, re-enter the iteration number less, the company is very proud of ANSYS technologies.

6. Conclusion

There was a saying, "澶ч奔鍚冨皬楸?, warned that if they can not themselves become larger, can be annexed. But the rules of the game in today's world has changed, become "fast fish eat slow fish." Do not you see the big recent acquisition of CAE industry, are a typical "slow fast food" rather than "eat little." If you can not be like the old program ANSYS as Nirvana, you may be new or alternative technology mergers and acquisitions, from the historical stage. No matter how a software will not Nirvana, does not affect the CAE industry, ashes, we are fortunate in growing up in a new era of phoenix wings Jifei!







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