Teoretisk verifiering av kubisk blandningstank
(2007) MMK820Innovation
- Abstract
- The purpose of this work has been to perform numerical calculations on the cubical
mixing tank the QB mixer, to be able to verify its strength and try to improve it. The
QB mixer is produced by the company QB FoodTech AB.
Firstly a CAD model was made from drawings of the mixer. Then the structure was
analysed in aspects of pressure load, thermal loads and gravitational load. A modal
analysis to get the natural frequencies was also made. All the analyses were
performed in a FEM-program. The results of the analysis of the pressure load was
verified using strain gauge technique. Unfortunately there was no opportunity to
verify the thermal loads. Since some simplifications and limitations were made, the
results of the thermal loads... (More) - The purpose of this work has been to perform numerical calculations on the cubical
mixing tank the QB mixer, to be able to verify its strength and try to improve it. The
QB mixer is produced by the company QB FoodTech AB.
Firstly a CAD model was made from drawings of the mixer. Then the structure was
analysed in aspects of pressure load, thermal loads and gravitational load. A modal
analysis to get the natural frequencies was also made. All the analyses were
performed in a FEM-program. The results of the analysis of the pressure load was
verified using strain gauge technique. Unfortunately there was no opportunity to
verify the thermal loads. Since some simplifications and limitations were made, the
results of the thermal loads are not totally reliable.
Based on the results from the analysis of the actual design some changes were
analysed in a similar way. A strengthening system around the cylinder was added, the
position of the legs moved and the plate thicknesses of some parts were altered in
order to make the design lighter. Two types of strengthening systems were tested, one
circular and one hexagon shaped. Also rounds were added that makes the
strengthening beams follow the contour of the inner tank. This meant to eliminate
stress concentrations there.
The results showed that most of the changes improved the mixer in different ways.
Some eliminated high stresses and some decreased the weight with allowable stress
levels. The thickness of the sheet metal of the inner tank and the thickness of the
strengthening beams should probably be maintained though. It did not matter which
type of strengthening system around the cylinder was used, cylindrical or hexagon
shaped, the cheapest to produce should be chosen.
Since some simplifications were made one should be careful using especially the
thermal results of this thesis. To get more exact thermal results one should use a CFD
program to be able to analyze the heat flow processes more thoroughly. Before this is
done one can try to verify the thermal analysis with strain gauge technique though. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/1502700
- author
- Sjöholm, Mikael
- supervisor
- organization
- course
- MMK820
- year
- 2007
- type
- H2 - Master's Degree (Two Years)
- subject
- keywords
- mixer, tank, cubical, strain gauge, design analysis
- language
- English
- id
- 1502700
- date added to LUP
- 2009-11-24 15:35:08
- date last changed
- 2010-02-01 14:40:04
@misc{1502700, abstract = {{The purpose of this work has been to perform numerical calculations on the cubical mixing tank the QB mixer, to be able to verify its strength and try to improve it. The QB mixer is produced by the company QB FoodTech AB. Firstly a CAD model was made from drawings of the mixer. Then the structure was analysed in aspects of pressure load, thermal loads and gravitational load. A modal analysis to get the natural frequencies was also made. All the analyses were performed in a FEM-program. The results of the analysis of the pressure load was verified using strain gauge technique. Unfortunately there was no opportunity to verify the thermal loads. Since some simplifications and limitations were made, the results of the thermal loads are not totally reliable. Based on the results from the analysis of the actual design some changes were analysed in a similar way. A strengthening system around the cylinder was added, the position of the legs moved and the plate thicknesses of some parts were altered in order to make the design lighter. Two types of strengthening systems were tested, one circular and one hexagon shaped. Also rounds were added that makes the strengthening beams follow the contour of the inner tank. This meant to eliminate stress concentrations there. The results showed that most of the changes improved the mixer in different ways. Some eliminated high stresses and some decreased the weight with allowable stress levels. The thickness of the sheet metal of the inner tank and the thickness of the strengthening beams should probably be maintained though. It did not matter which type of strengthening system around the cylinder was used, cylindrical or hexagon shaped, the cheapest to produce should be chosen. Since some simplifications were made one should be careful using especially the thermal results of this thesis. To get more exact thermal results one should use a CFD program to be able to analyze the heat flow processes more thoroughly. Before this is done one can try to verify the thermal analysis with strain gauge technique though.}}, author = {{Sjöholm, Mikael}}, language = {{eng}}, note = {{Student Paper}}, title = {{Teoretisk verifiering av kubisk blandningstank}}, year = {{2007}}, }