Application to Short Fiber Reinforced Plastic (SFRP) Microstructure Optimization for NVH improvement

Mario J. Felice

CHALLENGE - The role of simulation is of critical importance to drive the powertrain design for Noise, vibration, and harshness (NVH) on a Component, Sub-System and System Level. Lightweighting is a key elements for delivering Sustainability. Reducing mass has an adverse effect on NVH. This requires to investigate how to effectively use the inherent damping characteristics of composite or plastic materials as an advantage for NVH.

SOLUTION - The solution is to develop an integrated analytical process to optimize & tune for NVH the material microstructure of SFRP for an ENGINE MOUNT BRACKET application such to deliver the lightwighting requirements as well as NVH. This approach combines Anistropic material modeling; Mold flow analysis; Finite Element Analysis and Multi-Disciplinary Optimization.

BENEFITS -  A Multi-Discipline Optimization method, driven by modeFRONTIER,  was developed to evaluate interaction effects between resine type, fiber orientation, fiber glass length and % fiber glass content to determine the key factors that impact the mount bracket NVH performance. Obtained results indicate that:

  • The resin is a key factor that controls the amplitude of the bracket compliance. The fiber orientation is a secondary factor that impact the bracket compliance.
  • The glass fiber mass fraction is a key factor that controls the frequency of the bracket. The fiber aspect ratio is a secondary factor that impact this frequency.