Introduction to NVH Engineering & Human Perception
Loudness perception, equal-loudness Fletcher-Munson contours, decibel arithmetic (SPL, SWL, SIL), frequency weighting filters.
Single Degree of Freedom (SDOF) Structural Dynamics
Spring-mass-damper models, viscous/coulomb/hysteretic damping, dynamic amplification factor, transmissibility, isolation efficiency.
Multi-Degree of Freedom (MDOF) Systems & Modal Analysis
Matrix equations of motion, eigenvalues/eigenvectors, mode orthogonality, modal coordinate decoupling, FRF receptance matrix.
Vibration of Continuous Systems
Euler-Bernoulli beams, wave propagation, cantilever boundary conditions, orthogonal eigenfunctions.
FEA Formulations & Mass Matrices
Consistent vs. lumped mass matrices, linear bar and beam elements, modal participation factors, modal truncation error.
Principles of Acoustics & Sound Wave Propagation
Conservation laws in fluids, sound velocity, acoustic impedance, plane waves, spherical waves, acoustic intensity.
Acoustic Cavities & Waveguides
1D acoustic column, 3D rectangular cavity resonance, silencers, muffler expansion chamber transmission loss.
Coupled Structural-Acoustics (Fluid-Structure Interaction)
Coupled structural-acoustic matrices, panel sound radiation efficiency, FSI coupled finite elements.
Advanced Damping Treatments & Viscoelastic Materials
Complex shear modulus, unconstrained vs. constrained layers, Tuned Mass Damper (TMD) sizing and optimization.
Statistical Energy Analysis (SEA) for High-Frequency NVH
High-frequency limits of FEM, subsystem energy conservation, modal density estimation, coupling loss factors.
Transfer Path Analysis (TPA) & Source-Path-Receiver Models
Source-path-receiver, mount stiffness method, matrix inversion, airborne vs. structure-borne path identification.
NVH Signal Processing & Experimental Modal Testing
Accelerometers, hammers, shakers, Fast Fourier Transform (FFT), windowing, leakage, coherence, H1 & H2 FRF estimators.
NVH Design Optimization & Body-in-White (BiW) Workflows
Body-in-white modes, dynamic stiffness, point mobility, bead patterns, acoustic packaging, modal alignment.