Cabin Acoustics
While the vehicle is in motion, the reactions from the ground are transferred to the vehicle bodies, further transferring them inside the cabin. The vibration resonates with various interior panels (Panel Participation Factor) creating structure borne noise (Sound Pressure level/ SPL). If not designed properly, the internal noise can make driver and passengers uncomfortable.
In some advance cases, SPL values derived from the simulations are utilized to simulate noise propagation using Boundary element method (BEM).
The NVH optimization critically balances strength, stiffness and material properties. Hence, dealing with it requires a good know-how. Few of NVH expertise which ESPL offers are as below.
- Vehicle Drive cycle simulation
- 4 poster dynamic test simulation
- Random Vibrations (Road Load Data/ RLD, Power Spectral Density/ PSD)
- Cyclic Vibration (Frequency Response/ FRF)
- Multi- Body Dynamics of Powertrain/ Drivetrain for predicting Noise levels
- Structural Born Noise
- EMS output mapped with MBS+ FEA for Electric Drive Units (EDU)
- Squeak & Rattle
Vibro Acoustic Workflow
Calculation of Dynamic Loads
- 1. 1D System simulation
- 2. MBS
Dynamic Loads
- 1. Random (RLD/PSD)
- 2. Cyclic (Rotating / oscillating parts) (FRF)
Vibration
- 1. Operating Frequency Range
- 2. Eigen Values
- 3. Structure borne noise
Noise Prediction
- 1. Structure-Fluid Cavity model
- 2. Boundary element method (BEM)