NVH & Frequency Domain Analysis in LS-DYNA

The objective of the training course is to introduce the frequency domain vibration and acoustic
features of LS-DYNA to users, and give a detailed look at the application of these features in vehicle
NVH simulation.

 

This course is recommended for engineers who want to run NVH or other frequency domain vibration and acoustic simulation problems with LS-DYNA. This course is useful for engineers and
researchers who are working in the area of vehicle NVH, aircraft/spacecraft vibro-acoustics, engine
noise simulation, machine vibration testing and simulation, etc.

 

Contents

 

  • Introduction
    • Overview of the frequency domain features of LS-DYNA
    • Application
    • NVH theory and lab testing technology
    • Frequency domain analysis vs. time domain analysis
    • Fourier transform Windowing technique
  • Frequency Response Functions
    • Modal superposition method
    • Damping
    • Pre-stress condition
    • Nodal force / resultant force FRF
  • Steady state dynamics with harmonic loading
    • Large mass method for enforced motion
  • Random vibration with PSD loadingNVH_Frequency
    • Correlated multiple excitations
    • Acoustic wave environment
    • Restart feature
    • Pre-stress conditionNVH_Frequency
    • Random fatigueNVH_Frequency
    • Miner’s rule
    • S-N fatigue curve
    • Steinberg’s three band technique
    • Dirlik method
  • BEM acoustics
    • Helmholtz integral equation
    • Approximate methods (Kirchhoff method/Rayleigh method)
    • Collocation BEM
    • Dual collocation BEM for irregular frequency problems
    • Variational indirect BEM
    • Half-space problem
    • Impedance boundary condition
    • Panel contribution analysis
    • Muffler transmission loss analysis
  • FEM acoustics
    • Elements used in FEM acoustics
  • Coupling of vibration and acoustic analysis
    • Transient simulation followed by acoustic analysis
    • Frequency domain simulation followed by acoustic analysis
    • Full coupling analysis using Kirchhoff method
  • Response spectrum analysis
    • Input earthquake spectrum
    • SRSS method
    • NRC grouping method
    • CQC method
    • Double sum method
    • NRC sum method
  • Post-processing of analysis results
    • Binary plot databases (d3ssd, etc.)
    • ASCII databases (nodout_ssd, elout_ssd, etc.)
  • Workshop
Dates
Dates Duration/days Registration Referee Language Location Fee
12.11.2019
2 days
Dr. A. Jonsson
Linköping
10000 SEK
10.03.2020
2 days Registration
Dr. A. Jonsson
Gothenburg
10000 SEK

Lecturers

Dr. A. Jonsson
Dr. A. Jonsson
Registration and Information

Registration and information

 

 

Contact
contact Mikael Schill
  • LS-DYNA
  • Material modeling
  • Forming Technology
contact Elizabeth Mäki Björklund
  • Sales Coordinator
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