What do you need to consider regarding acoustic and haptic design of control elements? How will you achieve uniform operating sounds even under different excitation?

In an automobile's cockpit you will usually find a multitude of operating devices - lift, trigger and rotary switches as well as control panels and push buttons. Besides their main function, to enable operation and handling of the car, the acoustic and haptic behavior of these control elements pose a key factor in regard to perceived quality of the vehicle.

In order to achieve a uniform and consistent overall impression components from several different suppliers need to be integrated perfectly into the car's interior. More and more OEMs define target sounds for their operating elements, which need to be implemented by their suppliers. Depending on brand and purpose these targets can range from high-frequent and rather sporty to low-frequent and solid.

What are the advantages of Virtual Prototyping?

A virtual prototype will enable you to evaluate haptics and acoustics even in the early stages of development. Divergences, e.g. regarding sound pressure level or decay factor, can be identified and reduced with the help of simulations. This approach offers the advantage of reducing cost with faster development cycles as well as enabling adjustments and variant comparisons at low effort.

Which numeric methods are best suited for designing operating devices?

Depending on design and operating concept various numerical methods, like Finite Element Method (FEM), Boundary Element Method (BEM) or Multibody Dynamics (MBD), can be applied. Different algorithms in multi-physical simulation take into account not only mechanical components but also electromegnetic elements (like blocks, solenoids, loudspeakers). We especially recommend a combined approach of simulation and measurement to even better align your simulation models to your real product.

Don't forget to consider these crucial points:

1. The kind of system and its excitation:
   Are you assessing a rotary or push button, a touchscreen, a switch? Different excitations affect formation and transmission of vibrations.
2. If you change the position of the excitation, the emitted noise will change as well.
   If there are several push buttons on a control unit, even with identical excitation force each will produce a different noise depending on its position.
3. Differences in sound pressure level can be offset by modifying the structure (e.g. adapting local rigidity).

Which services does Novicos offer regarding acoustic and haptic design of operating devices?

As an expert in numeric acoustics Novicos will support you with:

• numeric analysis (FEM, BEM, MBD) as well as acoustic and haptic design of your product
• evaluation of operating sounds, e.g. e.g. from simulated audio data, with a VR model of a car and more
• accompanying measurements
• developing, building and commissioning of test benches (EoL and Lab)
• training and skills development within your team
• finding the best possible simulation and/or testing solution for your specific needs

 

Would you like to learn more about this topic? Do you have a specific example? Discuss your case with one of our experts!