Transactions of Nanjing University of Aeronautics & Astronautics
Geometrically Nonlinear Random Responses of Stiffened Plates Under Acoustic Pressure
- Article
- Figures
- Metrics
- Preview PDF
- Reference
- Related
- Cited by
- Materials
Abstract:
An algorithm integrating reduced order model （ROM）， equivalent linearization （EL）， and finite element method （FEM） is proposed to carry out geometrically nonlinear random vibration analysis of stiffened plates under acoustic pressure loading. Based on large deflection finite element formulation， the nonlinear equations of motion of stiffened plates are obtained. To reduce the computation， a reduced order model of the structures is established. Then the EL technique is incorporated into FE software NASTRAN by the direct matrix abstraction program （DMAP）. For the stiffened plates， a finite element model of beam and plate assembly is established， in which the nodes of beam elements are shared with shell elements， and the offset and section properties of the beam are set. The presented method can capture the root-mean-square （RMS） of the stress responses of shell and beam elements of stiffened plates， and analyze the stress distribution of the stiffened surface and the unstiffened surface， respectively. Finally， the statistical dynamic response results obtained by linear and EL methods are compared. It is shown that the proposed method can be used to analyze the geometrically nonlinear random responses of stiffened plates. The geometric nonlinearity plays an important role in the vibration response of stiffened plates， particularly at high acoustic pressure loading.
Keywords:
Project Supported:
Clc Number:
O322
Mobile website
