Use equivalent radiated power (ERP) response to conduct a shape optimization of an oil
pan cover by applying a specific excitation in frequency response analysis using OptiStruct.
Figure 1. FE Model
Model Files
Before you begin, copy the file(s) used in this example to
your working directory.
The objective is to reduce radiated noise from a structure by changing the shape, which is
the design variable. Initially, you identify the location on the structure which contributes
most, and to identify those frequencies where the radiation becomes maximum (with the
nominal run). Here, the Frequency Response Analysis (with the frequency range from 1000Hz to
2200Hz) subcase is used to compute the equivalent radiated power (ERP) of this part.
FE Model
Element Types
CQUAD
The linear material properties are:
MAT1
Young’s Modulus
2.1E5 MPa
Poisson's Ratio
0.3
Density
7.9E-9
Results
Based upon these findings, a shape optimization of the oil cover has been performed to
reduce the contribution and thus, reduce the peak at 1200Hz shown in Figure 2. Figure 2. Shape Contour, ERP Output . before and after optimization, and objective
