Noise and Vibration Investigation of Composite Shaft

Experimental and numerical analyses of a composite tubular shaft in order to investigate its sound radiation properties for a vibratory torque excitation were performed. Experimental and numerical analyses in order to establish material properties of the laminate were performed.


1. Notation
2. Introduction
3. Composite Shaft Propulsion
4. Composite Shaft Material
4.1 Laminate Build-up
4.2 Laminate theory
4.2.1 Material properties of the laminate
4.3 Tensile test of Ex
4.3.1 Experimental Procedure
4.3.2 Results of Tensile Test
5. Acoustic Theories
5.1 Sound in structures
5.2 Wave types
5.3 Boundary Element Method
6. Introductory Experiment
6.1 Experimental Analysis of Test Specimen
6.1.1 Experimental Equipment
6.1.2 Test Specimen
6.1.3 Experimental set-up
6.1.4 Measurement Procedure
6.2 Numerical Analysis of Test Specimen
6.2.1 Building the Laminate
6.2.2 Finite Element Model
6.3 Results
7. Structural Dynamic Full-scale Measurements
7.1 Measured Signals
7.2 Processing of Measured Signals
7.3 Excitation Frequencies
8. Finite Element Model
8.1 Shell
8.2 Cap
8.3 Assembled shaft
9. Solving the Model in I-DEAS
9.1 Boundary Conditions
9.2 Model Solution
9.3 Model Response
9.4 Vibro-Acoustics
9.5 MatLab
10. Results and Discussion
10.1 Results of computation
10.2 Results of Computation with Excitation by a Measured signal
10.3 Results of computation of a stiffer shaft
10.4 Discussion of Computed results
11. Further Research
11.1 Stiffer Shaft
11.2 Shaft Damping
11.3 Excitation Damping
12. Conclusions
13. References
14. Appendices
A. Tensile Test of Ex
B. Mode Shapes

Author: Fredrik Cato, Magnus Taskinen

Source: Blekinge Institute of Technology

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