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Modal Analysis on a MIMO System: For an asphalt roller CC1200
Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering.
Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering.
2015 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Impact hammer is the current modal testing way in Dynapac testing department. Due to highly damped characteristic of big construction machines, there are a few weaknesses for modal testing when using hammer, such as short response time, limited frequency resolution, poor quality of frequency response functions. Therefore, a more advanced excitation equipment is needed to improve the measurement quality.

The object for this study is to compare two different measuring methods. The thesis will show a comparison between the hammer testing and the shaker MIMO testing compared with analytical model in a highly damped system. It will also give a reference for further highly damped modal analysis and budgetary assessment to decide the budget expenditure.

Result from shaker testing shows a little better correlation than hammer testing compared with FEM model. While the correlation between FEM model and measurement is bad due to many reasons, such as many local modes that can not excited, lack of excitation points, unexpected noise and error from the measurement. While considering the compared results obtained from this machine for now, a simpler structure experiment is suggested to be carried on in the future. Shorter length of stinger can be used to enable higher amplitude of force to excite the property on this machine.

Place, publisher, year, edition, pages
2015. , 113 p.
Keyword [en]
Experimental modal testing, MIMO system, modal analysis, Matlab, numerical model, Reflex.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:bth-10998OAI: oai:DiVA.org:bth-10998DiVA: diva2:873282
External cooperation
Dynapac compaction Equipment AB, Karlskrona
Subject / course
MT2525 Masters Thesis (120 credits) in Mechanical Engineering with emphasis on Structural Engineering; MT2538 Degree Project in Master of Science in Mechanical Engineering
Educational program
MTAMT Master of Science Programme in Mechanical Engineering with emphasis on Structural Mechanics; MTACI Master of Science in Mechanical Engineering
Presentation
2015-10-28, J1640, Blekinge Tekniska Högskola, Karlskrona, 14:10 (English)
Supervisors
Examiners
Available from: 2015-12-07 Created: 2015-11-23 Last updated: 2015-12-07Bibliographically approved

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BTH2015Chen(7175 kB)2299 downloads
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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
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  • nn-NO
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  • Other locale
More languages
Output format
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