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Optimising Vehicle NVH with CAE

 

The Benefits of Improving NVH

  • Meeting legislation: legislation exists in most markets to set maximum limits for noise and vibration.  This can be for pass by noise or to meet working environment directives.  If products don’t meet the legislative targets they will be prevented from selling or will incur a fine.
  • Increasing sales: demand for a product will be increased by optimising the NVH.  This can be through reducing overall NVH levels or achieving the appropriate sound for your brand e.g. a high performance versus luxury vehicle.  This increased demand can be turned into increased unit sales or margins or a combination of the two.

Challenges to Maintaining or Optimising Vehicle NVH

  • Changing performance targets: the vehicle or component will be in a constant state of development to improve one or more of the following: styling, aerodynamics, NVH, safety, vehicle dynamics, weight, cost, size.
  • New applications: the chassis and subsystems such as suspension and brakes will be carried over to different sub-segments to increase sales volumes either within or across segments for example hatchback, estate, crossover.  There may be 2WD and 4WD variants and different powertrain options including diesel hybrid and pure EV.
  • New environments: the vehicle may be sold in different geographical markets to increase sales.  These may have significantly different road conditions and operating temperatures than the home market.
  • New duty cycles: new customers may introduce more severe usage patterns for example the police or military environment.

The Importance of Design Verification using CAE
Whenever a design is changed, for whatever reason, it is essential that the product is tested either physically or virtually to determine whether those changes have had a negative effect on its NVH performance. For example a styling change could modify the airflow around the vehicle which may increase wind noise as certain velocities. This outcome can be minimised through good design based on a solid understanding of aerodynamics and NVH fundamentals.

As discussed in the Vehicle page CAE simulation allows the engineer to verify relatively quickly and cheaply whether the revised product still meets its NVH targets. To read more about the benefits of CAE click here.

When optimising NVH is the main design objective then CAE simulation can be performed to check any negative consequences on any of the other attributes including weight, durability, thermal, safety, vehicle dynamics and aerodynamics.  For example adding dampers to reduce vehicle vibrations at certain engine speeds can increase weight and negatively impact handling performance. Again this outcome can be mitigated through good design based on a solid understanding of NVH fundamentals and advanced problem and product specific simulation tools.

The Caepro Advantage
Caepro has performed NVH CAE on the major components of the vehicle both individually and as an assembly. This includes both fluid and structure borne noise. Our deep product knowledge and experience enables us to:

  • Understand your objectives for the product
  • Prepare a model optimised for calculation speed and accuracy
  • Apply appropriate boundary conditions
  • Perform simulation using world-class procedures and tools
  • Make sensible recommendations for design improvements
  • Minimise any negative impact on other attributes

To get more information or to request a quote for vehicle NVH CAE please submit an enquiry. For more on why Caepro is the best partner for your outsourced CAE requirements please read our 9 Reasons for Using Caepro article.

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