Background
Related works
Objective
Materials
Breast model
Finite element analysis
Fixation degree condition DOF | 6 |
Air injection load kPa | 1.27 |
Air injection point mm | Center portion with a diameter of 10 |
Depth of the pushing cylinder mm | 5.0 |
Element count | 21,942 |
Number of contacts | 34,085 |
Coefficient of mass matrix in Rayleigh attenuation α | 10 |
Coefficient of stiffness matrix in Rayleigh attenuation β | 1.762 × 10−4 |
Mode damping ratio ζ1, ζ2 | 0.438, 0.448 |
Methods
Air-compressor experiment
Specification | Value |
---|---|
Material | Aluminum |
Outside diameter mm | 32 |
Thickness mm | 1.5 |
Height mm | 500 |
Finite element analysis experiment
Point | Distance from the center of the tumor mm | Characteristic |
---|---|---|
A | 0.0 | Center of the tumor |
B | 7.5 | Inside the tumor (half the tumor) |
C | 11.5 | Inside the tumor (outside the tumor) |
D | 13.5 | Inside the tumor (far) |
E | 15.0 | Under the cylinder |
F | 30.0 | Outside the cylinder |
Results
Air compressor experimental results
Finite element analysis results
Validation of the vibration analysis with a pushing cylinder method
Position relationship between load point and tumor
Measurement point | Peak frequency Hz | Difference from average of no tumor (47.5 Hz) Hz | |
---|---|---|---|
No tumor | Tumor | ||
(A) Center of the tumor | 47 | 53 | + 5.5 |
(B) Inside the tumor (Half the tumor) | 48 | 50 | + 2.5 |
(C) Inside the tumor (Outside the tumor) | 47 | 48 | + 0.5 |
(D) Inside the tumor (Far) | 48 | 48 | + 0.5 |
(E) Under the cylinder | 48 | 48 | + 0.5 |
(F) Outside the cylinder | 47 | 47 | − 0.5 |