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Investigation of Energy Suppression in Elastic Tubes Using Periodic Structures and 6 DOF Techniques

This study explores the use of periodic structures to suppress energy transmission in elastic tubes. Conducted by Ole Holst-Jensen and Sergey Sorokin, the research focuses on controlling pipe vibration through innovative engineering tools and theoretical optimization techniques. Experimental setups featuring highly damped terminations and reflecting terminations are utilized to analyze vibration modes and insertion losses. The research demonstrates the effectiveness of 6-degree-of-freedom (DOF) measurement techniques for identifying modes and matching eigenfrequencies with theoretical predictions, paving the way for future industrial applications.

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Investigation of Energy Suppression in Elastic Tubes Using Periodic Structures and 6 DOF Techniques

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  1. An investigation of a periodic structure to suppress the transmission of energy in an elastic tube, and experimental 6 DOF techniques to detect itOle Holst-Jensen1*, Sergey Sorokin et al21Minus10dBStokrosevej 29, 8330 Beder, Denmarkole.holst@minus10db.dk2Department of Mechanical Engineering, Aalborg UniversityPontoppidanstraede 101, Aalborg East, DK 9220, Denmarksvs@ime.aau.dk

  2. Periodic beam structures • Organisation: Makunet • Machine acoustic network • Major Danish industrial partners • Institute of Mechanical Engineering at Aalborg University Denmark • Purpose of this project • Use periodic structures to control pipe vibration in pipes and plates • Develop engineering tools for the design of periodic structures • Theoretical optimisation tool • Measurement tool • Background • Experimental setups • Pipe with highly damped termination • Beam with reflecting termination • Theory • Results with damped termination • 6 degree of freedom experimental technique • Application to beam with reflecting termination • Conclusion

  3. Transmission control

  4. Background Red: Motor spectrum Blue: impact spectrum Varying speed drive Operating range: 20 to 60 Hz shaftspeed Example: 38 Hz

  5. Tube ø 34 / 27, steel Length: 4000 mm Blocks: 75 x 75 mm h: 220 mm Block weight: 4000 g Damping stiffening: 19 x 19 mm Pipe with highly damped termination

  6. Pipe with highly damped terminationEffect of damping Undamped Damped

  7. Beam with reflecting termination Måling og analyse i 6 frihedsgrader

  8. Theory: Boundary equations

  9. Experimental Insertion Loss 3, 2 and 1 blocks 3: Heavy, light, medium blocks

  10. Comparison Insertion Loss

  11. Background6 Degree of freedom measurement • Simple method of separating modes • Torsional modes are often not recognized in simple measurements • Evolution of vibration measurements: • One axis • Three axis • 6 axis • Mulitchannel digtal techniques makes realtime 6 DOF possible

  12. Test setup • Comparison of plainbeam and beamwiththreeblocks • Two types of blocks • Aluminium 10 x 10 x 100mm beamwiththread • Block1: 47 g weighton top • Block 5: 156 g weightontop • Axes • X – verticalxx – bendinghorizontal plane • Y – horizontalyy-bendingvertical plane • Z – longitudinalzz –torsion longitudinal

  13. Setup7: 0 blocks- 3 block1 47 g

  14. Setup7: 0 bloks - 3 block5 203 g

  15. Conclusions • Pipe with highly damped termination • Eigenfrequencies match theory • Insertion loss show agreement between theory and experiment with stop bands, when using energy and acceleration levels • Beam with reflecting termination • 6 DOF measurement on rigid body termination can separate modes • Eigenmodes are suppressed • Further investigations: • Parametric studies • Application to industrial setting

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