LMS Engineering services - Balance road noise and vehicle
Siemens PLM Software LMS Engineering services Balance road noise and vehicle handling Simultaneously analyzing NVH and vehicle handling to identify optimal chassis and body design Benefits • Save resources and time by integrating customary and contradictory approaches in a unified engineering method Summary LMS™ Engineering services employ an integrated simulation approach to optimally balance noise, vibration and harshness (NVH) with vehicle handling during body design. • Understand how body stiffness influences NVH and vehicle handling characteristics by applying modifications in an optimization loop Automotive engineers must consider several handling aspects while designing a vehicle, such as drivability, stability, agility and control. At the same time, a good design will result in enjoyable ride comfort and low road noise levels. Finding the right balance between these often-conflicting functional performance characteristics can be a real engineering challenge in which body stiffness plays a crucial role. Multiattribute balancing includes optimization of NVH and vehicle handling performance in an integrated simulation approach. By employing innovative body stiffness simulation methodologies, mounts and • Find a solution that optimizes NVH and vehicle handling using computeraided engineering • Provide a common evaluation method to identify necessary compromises across attribute teams bushings can be optimized for both attributes at the same time in a comprehensive process. Multi-attribute balancing for road noise and vehicle handling starts by creating a finite element model (FEM) of the body. This will be transformed into an equivalent body concept model, which can be employed to handle both characteristics simultaneously. This is in contrast to the customary approach, which addresses these characteristics in separate engineering processes, leading to contradictory solutions. Including the body concept model in a full vehicle road noise model with suspension and trim and a full vehicle multibody handling model facilitates fast simulation loops for both attributes. By coupling parameters in both models and executing a large number of simulations, the optimal design can be found. www.siemens.com/plm/lms LMS LMS Engineering services Balance road noise and vehicle handling A typical multi-attribute balancing project for NVH and vehicle handling is comprised of the following phases: Creating the body model First, LMS Engineering experts create the detailed FEM model and use it as the basis to build a reduced fast-running model that produces exactly the same global structural modes. This body concept model is created by dividing the structure into functional components such as beams and joints, and combining them with a modal system representation. Structural members with length significantly greater than the cross-section area (such as pillars and cross members) are modeled with beam elements, the joints between them with static superelements and the rest of the structure by a modal model. Body concept model. Full finite element model. Parallel road noise and vehicle handling analysis The body concept model is included in a full vehicle multibody model for handling, and a full-vehicle model for road noise that has suspension and trim. While LMS Engineering experts fine-tune the handling model, the road-noise model automatically adapts. The efficiency of this solution allows for the evaluation of over a 1,000 variants in a single loop for optimizing both attributes at the same time. Multi-attribute optimization Finally, the optimized body stiffness is used as input for body design modification. This yields a new body model, which can be used to conduct repeated analyses until the desired performance is achieved. Further optimization can still include mounts and bushings as well. Contact Siemens PLM Software Americas +1 248 952 5664 Europe +32 16 384 200 Asia-Pacific +852 2230 3308 www.siemens.com/plm © 2015 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. 44366-Y6 3/15 C
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