VIP20

本课程属于：007-Advanced CAE Simulation and Engineering Analysis English Technical Courses · 共 20 门相关课程，组合学习更完整。

查看所属VIP全部课程 →

← 返回所属目录咨询 / 购买

Structural Vibration Qualification with Modal and Harmonic FEA

30 Chapters

View Course Samples Online

Qualification context and scope

vibration environments, qualification vs. analysis, and the role of modal and harmonic FEA in structural certification.

Qualificationvibration

Governing equations of structural dynamics

mass, damping, and stiffness matrices; modal superposition; and harmonic response formulation.

Governingequations

Modal analysis fundamentals

eigenvalue extraction, natural frequencies, mode shapes, and participation factors for qualification-relevant modes.

analysiseigenvalue

Harmonic response analysis fundamentals

steady-state forced response, frequency sweep, and direct vs. modal superposition methods.

Harmonicresponse

Damping modeling for qualification

viscous, structural, and modal damping; damping ratios from tests; and their effect on resonant response.

modelingqualification

Finite element model setup for vibration qualification

geometry simplification, mesh density, element selection, and boundary conditions.

vibrationqualification

Material and mass modeling

elastic properties, density, temperature effects, and non-structural mass representation for accurate dynamics.

Materialmodeling

Boundary conditions and connections

fixed, pinned, elastic supports, bolted and bonded joints, and their influence on modal and harmonic results.

Boundaryconditions

Pre-stress and geometric nonlinearity

prestressed modal analysis, stress stiffening, and when linear harmonic assumptions remain valid.

Pre-stressgeometric

Modal analysis solution setup

frequency range, number of modes, solver selection, convergence, and mode tracking for qualification.

analysissolution

Harmonic response solution setup

frequency spacing, load application, sweep type, and output requests for qualification metrics.

Harmonicresponse

Load definition for harmonic analysis

base excitation, force excitation, pressure, and acceleration PSD conversion to harmonic inputs.

definitionharmonic

Random vibration and PSD to harmonic equivalence

Miles' equation, 3-sigma response, and practical mapping to harmonic qualification cases.

Modal participation and effective mass

mode selection criteria, cumulative effective mass, and ensuring qualification-relevant modes are captured.

participationeffective

Frequency response functions (FRFs)

computing, interpreting, and validating FRFs against test data for qualification.

Frequencyresponse

Resonance identification and avoidance

Campbell diagrams, mode veering, and design modifications to shift frequencies away from excitation.

Resonanceidentification

Response metrics for qualification

displacement, velocity, acceleration, stress, and force; peak vs. RMS; and margin assessment.

Responsequalification

Stress and fatigue from harmonic response

dynamic stress recovery, stress concentration, and fatigue life estimation under vibration.

harmonicresponse

Model validation and correlation

modal test data, FRF correlation, MAC, and updating FE models for qualification confidence.

validationcorrelation

Uncertainty and variability

material scatter, boundary condition uncertainty, and sensitivity analysis for robust qualification.

Uncertaintyvariability

Qualification to standards

MIL-STD-810, NASA-STD-7001, IEC 60068, and aerospace/automotive vibration qualification requirements.

Qualificationstandards

Sine sweep and sine dwell testing

test setup, control strategies, and correlation with harmonic FEA predictions.

strategiescorrelation

Random vibration testing

PSD input, response limiting, and comparison with harmonic and modal FEA results.

Shock and transient vibration

SRS, shock response spectrum, and when harmonic FEA is insufficient for qualification.

transientvibration

Acoustic and high-frequency vibration

statistical energy analysis (SEA) vs. FEA, and hybrid approaches for qualification.

Acoustichigh-frequency

modal and harmonic FEA of an electronics enclosure for aerospace vibration qualification.

automotive component qualification using modal and harmonic FEA with base excitation.

automotivecomponent

qualification of a rotating machinery support structure using modal and harmonic FEA.

qualificationrotating

Practical workflow

from CAD to qualification report; automation, scripting, and documentation for modal and harmonic FEA.

Emerging trends and advanced topics

nonlinear vibration, model reduction, digital twins, and machine learning for vibration qualification.

Emergingadvanced