Great Wall Motor Company

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1 Automotive and transportation Company Developing high-quality luxury SUVs using LMS for NVH engineering Product LMS Challenges Optimize NVH performance for luxury SUVs Deploy an efficient process that resolves issues from the early design stages Build knowledge about highend acoustic applications Become a world-class brand for NVH performance Keys to success Use vibro-acoustic simulation to do targeted improvements to the body design Combine test and simulation in hybrid modeling for product refinement Deploy advanced acoustic simulation solutions for high-end applications Use precise and robust testing for prototype validation Results Optimized premium-class vehicles for NVH performance Siemens PLM Software technology helps Chinese car manufacturer deliver world-class NVH performance using accurate simulation and testing throughout the entire development cycle Designing luxury cars for high comfort and brand value Luxury carmakers differentiate from competition by offering their customers optimal driving comfort and pleasure. Annoying noises and vibrations need to be thoroughly avoided. Often, even the sound of the powertrain is designed to reflect the brand image. By creating unique value, high-end vehicle manufacturers can sell their products in a global market, where only the best can survive. However, controlling noise, vibration and harshness (NVH) and designing for acoustics is becoming ever more complex. Legislation continuously dictates tougher noise and vibration limits. In addition, the industry mandate for fuel economy compels carmakers to downsize engines and use lighter materials, which could affect NVH. The increased use of electrical systems in the vehicle also adds numerous potential noise sources to the cabin. Finally, ride comfort has to be balanced against vehicle handling during development, as all aspects combined result in the complete and unique driving experience the designers have in mind, and the market expects. NVH as crucial development aspect Company Limited (GWM) knows what it takes to create top-class

2 Results (continued) Documented knowledge for continuous improvement in future projects Became a reference for NVH engineering in the Chinese automotive industry The Siemens PLM Software specialists offer us first-class support and training. We ve had a good relationship with them for many years. They organize learning events, offer us a lot of materials in local language, and they host public discussion forums where more than a thousand professionals exchange ideas. The Siemens PLM Software experts and their LMS products have a strong reputation with NVH engineering specialists in the Chinese automotive industry. vehicles. Eager to become a brand recognized worldwide for luxury sports utility vehicles (SUVs), this Chinese company has heavily invested in a large technology center for vehicle development, employing over 10,000 professionals in research and development (R&D) for constant quality improvement. The company s activities include NVH and acoustics as one of the crucial aspects that need to be considered throughout the entire vehicle development cycle. Finding NVH problems after production can really become an expensive matter, explains, director of the body NVH engineering department at the GWM Technical Center. As NVH results from a complex interaction between numerous sources, investigating issues which appear that late can take a lot of time. This obviously costs resources, both in manpower and materials. But even more importantly, it could seriously postpone the time-to-market of a new vehicle type, and as such endanger our competitive position. For this reason, we absolutely need powerful tools, both for predicting the NVH performance during the very early design stages and for analyzing and resolving issues during the validation stage. All these tools can be found in LMS TM solutions from Siemens PLM Software. By uniquely combining test and simulation, this comprehensive platform contains the right solution for a wide range of NVH- or acousticsrelated applications. Acoustic simulation in early design GWM engineers start performing 3D simulations using LMS Virtual.Lab TM Acoustics software as soon as they have the first The combination of LMS solutions allows us to do the most precise and detailed analyses. It helps us to reach the best possible end result for NVH performance.

3 geometric models of a new design available, either for the body or for subsystems such as engine, intake or exhaust. This solution contains a complete set of vibro-acoustic solvers, based on the finite element method (FEM) or the boundary element method (BEM), as well as dedicated methodologies for efficient acoustic meshing, contribution analysis, aero-acoustic source modeling and more. It can be used for both interior and exterior noise radiation problems. With very specific features for pre- and postprocessing, as well as capabilities for integrating data that originates from testing, LMS Virtual.Lab Acoustics is particularly well designed to tackle automotive engineering challenges. LMS Virtual.Lab Acoustics helps us a lot when evaluating the body structure for interior noise during the first phases of the development cycle, when no physical prototype is available, says Erbao. These analyses can be very detailed, because the solvers are very powerful and the software contains dedicated modeling tools. We can use an integrated cavity mesher, for example, which can produce a very fine and accurate acoustic mesh for the car interior. GWM engineers fully explore the features of the software that provide insight into the origin of potential problems and that facilitate solutions. During the postprocessing of calculation results, we can use special displays that show us precisely how noise is generated, says Erbao. We can see along which path the noise is transferred from the sources to the receiver positions, which panels vibrate more, and which structural or acoustic modes are important. All these path, panel and modal contributions can be ranked in order of relevance. Their sizes and relative phases lead us straight to the origin of problems. And, on top of that, we can use tools for structural and acoustic sensitivity analysis to investigate where it would be most effective to take action. This helps us make targeted decisions for the body that avoid issues while reducing weight. Exploring high-end solutions Besides doing early-stage body optimization, GWM specialists have also deployed advanced methodologies for high-end acoustic applications. For specific problems such as engine radiation and intake and exhaust systems, accurate simulation takes more than just a standard solution. LMS Virtual.Lab Acoustics features dedicated technologies such as FEM automatically matched layer (AML) that allows simulating the free field by expanding the FEM domain to infinity with minimum modeling effort, and FEM adaptive order (FEMAO) that speeds up calculations by automatically adjusting the model size to the desired calculation frequency. By combining methods like these with features that correctly describe, for example, special materials or the effect of temperature on LMS Virtual.Lab has become a cornerstone of our development process. LMS Virtual.Lab is very popular among our engineers, because the graphical user interface is very userfriendly, visualizations are very comprehensive, and it integrates seamlessly with our existing computer-aided design and testing tools.

4 the acoustic field, GWM can do precise transmission loss calculations on exhaust systems in a very effective manner. In addition, solution schemes based on acoustic transfer vectors (ATVs) dramatically increase efficiency when computing radiation problems for an entire engine run-up. We have made enormous progress over the past few years, says Erbao. Our company has successfully implemented an extensive strategy for NVH research. All our activities and experience have been bundled in a report called The NVH System Construction of SUVs. With this work, we won the Baoding Scientific and Technological Progress Award. Research at GWM also includes investing resources in technologies that will become more important in the future. As the next-generation of hybrid and electric powertrains continue to eliminate noise and make significant strides toward a silent ride, secondary noise sources like the wind and the road will become important. LMS Virtual.Lab Acoustics contains functionalities that convert results of computational fluid dynamics (CFD) simulations into equivalent acoustic sources for effective aero-acoustic analysis. These capabilities can help across a number of areas, such as side mirror design. By frontloading certain choices to early design phases, engineers can dramatically reduce expensive wind tunnel testing time. For the specific case of road noise, the software has features that handle partially correlated load signals, as opposed to powertrain-related signals, between which the phase-relation is usually fixed and well-known. Road noise is currently on top of our agenda, confirms Erbao. We are studying how we can collect real road load data and how we can best apply it to a full vehicle for vibro-acoustic response analysis. This hybrid modeling gives us a lot of flexibility, because it allows us to work with all available data. Already in the early design stages, it can be useful to combine new structures with measured components of earlier, similar models. But, most importantly, these methods dramatically increase the efficiency of the prototype improvement process. The use of LMS testing during prototype validation delivers high-quality measurement data in a timely manner.

5 We have built-up substantial knowledge about NVH over the last few years. This knowledge is translating into insight that clearly reflects in our products. When it comes to NVH performance, GWM vehicles are the best in the Chinese market, and that s all thanks to our LMS solutions. Further refinement and validation As development gradually advances, more real data and even prototype test results become available and can be introduced in the simulation models. GWM engineers have vast experience using LMS SCADAS TM hardware and LMS Test.Lab TM software. These LMS testing solutions combine highspeed, multichannel data acquisition with a full suite of integrated analysis and reporting tools for several engineering applications, including NVH and acoustics. Results from these solutions can be seamlessly incorporated into the LMS Virtual.Lab simulations. This can happen on different scales: the data can be used to simply increase accuracy of materials, properties and boundary conditions, or it can be used to turn a full vehicle model into a hybrid test-simulation model by replacing entire components with a set of measured modes or frequency response functions (FRFs). A dedicated software module, LMS Virtual.Lab Noise and Vibration, features solvers that are specifically designed for these hybrid models. They run extremely fast and are especially suitable for what-if scenarios and full-vehicle NVH refinement. This hybrid modeling gives us a lot of flexibility, because it allows us to work with all available data, says Erbao. Already in the early design stages, it can be useful to combine new structures with measured components of earlier, similar models. But, most importantly, these methods dramatically increase the efficiency of the prototype improvement process. The solvers run very fast and deliver extra results for even more insight in the NVH behavior. Besides contributions from source to target on the full vehicle, we can also see how the vibration energy is transferred by individual components and their modes. That is a great asset when we need to consider countermeasures, for example, by modifying connection stiffness. When reaching the late development stages, the relative importance of LMS test solutions over simulation solutions obviously increases as the final validation approaches. Still, the calculation models play a crucial role when issues appear. Trying out modifications using simulation is

6 Solutions/Services LMS Virtual.Lab Acoustics www. siemens.com/plm/lmsvirtual-lab/acoustics LMS Virtual.Lab Noise and Vibration www. siemens.com/plm/lmsvirtual-lab/noise-vibration LMS Virtual.Lab Correlation www. siemens.com/plm/lmsvirtual-lab/correlation LMS Test.Lab www. siemens.com/plm/ lms-test-lab Customer s primary business (GWM) Company Limited is China s largest SUV and pickup manufacturer. Activities include research and development, manufacturing, sales and after-sales. Customer location Baoding, Hebei province China much faster and cheaper than implementing them on a physical prototype. Of course, detailing a structure at this level requires highly accurate calculations. By using LMS Virtual.Lab Correlation, GWM engineers can compare simulation models with test results, and optimize them until they exactly match reality. In this way, test and simulation mutually improve each other until the best solution is reached. The final result is a validated vehicle prototype with optimal NVH performance and an equivalent simulation model that precisely matches the real structure. The combination of these solutions allows us to do the most precise and detailed analyses, says Erbao. It helps us to reach the best possible end result for NVH performance. Successfully deploying solutions As LMS solutions are so prominent throughout the entire development cycle for optimizing one of the most important performance criteria, a successful deployment across users and a seamless integration with the existing process are crucial. Thanks to excellent collaboration between the Siemens PLM Software team and GWM engineers, this occurred smoothly and easily. The Siemens PLM Software specialists offer us first-class support and training, says Erbao. We ve had a good relationship with them for many years. They organize learning events, offer us a lot of materials in local language, and they host public discussion forums where more than a thousand professionals exchange ideas. The Siemens PLM Software experts and their LMS products have a strong reputation with NVH engineering specialists in the Chinese automotive industry. According to Erbao, this professionalism was an important reason for GWM s choice of LMS solutions as well as its continually expanding use of LMS technologies. He particularly cites the tools power, openness and ease of use. LMS Virtual.Lab has become a cornerstone of our development process, emphasizes Erbao. LMS Virtual.Lab is very popular among our engineers, because the graphical user interface (GUI) is very user-friendly, visualizations are very comprehensive, and it integrates seamlessly with our existing computer-aided design (CAD) and testing tools. The use of LMS testing during prototype validation delivers high-quality measurement data in a timely manner. Erbao notes that GWM engineers have learned a great deal by adopting Siemens PLM Software s NVH vision in their standard development process. By selecting the right tools, we want, in the first place, to avoid issues on the design we are working on, says Erbao. But we also want to learn lessons for the next design. Converting the experience we gather by working on one model into concrete indicators for potential problems before starting on the next one is very important, if we want to continuously develop better products. LMS solutions provide GWM engineers with exactly this insight. We have built-up substantial knowledge about NVH over the last few years. This knowledge is translating into insight that clearly reflects in our products. When it comes to NVH performance, GWM vehicles are the best in the Chinese market, and that s all thanks to our LMS solutions, concludes Erbao. Siemens PLM Software Americas Europe Asia-Pacific Siemens Product Lifecycle Management Software Inc. Siemens and the Siemens logo are registered trademarks of Siemens AG. LMS, LMS Imagine.Lab, LMS Imagine.Lab Amesim, LMS Virtual.Lab, LMS Samtech, LMS Samtech Caesam, LMS Samtech Samcef, LMS Test.Lab, LMS Soundbrush, LMS Smart, and LMS SCADAS are trademarks or registered trademarks of Siemens Industry Software NV or any of its affiliates. All other trademarks, registered trademarks or service marks belong to their respective holders Z13 8/15 A